Aurora Manufactured Gas Plant Site Supplemental …s3.amazonaws.com/mgpwebsites/aurora/project-documents...Aurora MGP Site ii SSI Report Nicor Gas is the Coordinating Utility for the

Prepared Under Contract to Nicor Gas

on Behalf of Nicor Gas and Commonwealth Edison

Aurora Manufactured Gas Plant Site

Supplemental Site Investigation Report

Prepared August 2003

Burns & McDonnell 2601 West 22nd Street

Oak Brook, Illinois 60523

Aurora MGP Site ii SSI Report

Nicor Gas is the Coordinating Utility for the Aurora manufactured gas plant (MGP) site. Burns & McDonnell is the contractor for Nicor Gas. The Coordinating Utility is acting on behalf of Nicor Gas and Commonwealth Edison.

Aurora MGP Site iii SSI Report

ACRONYMS AND ABBREVIATIONS

ASTM American Society for Testing and Materials bgs below ground surface BMcD Burns & McDonnell BNA base neutral acids BTEX benzene, toluene, ethylbenzene and total xylenes B&V Black & Veatch BVWS Black & Veatch Waste Sciences, Inc cfs cubic feet per second cm/sec centimeter per second DMW deep monitoring well DNAPL dense non-aqueous phase liquid EOX extractable organic halogens F Fahrenheit FEMA Federal Emergency Management Agency ft3 cubic feet IAC Illinois Administrative Code Illinois EPA Illinois Environmental Protection Agency ISGS Illinois State Geological Survey LNAPL light non-aqueous phase liquid mg/kg milligrams per kilogram mg/l milligrams per liter MGP manufactured gas plant ORP oxidation-reduction potential PAH polynuclear aromatic hydrocarbon PCB polychlorinated biphenyls PVC polyvinyl chloride RCRA Resource Conservation and Recovery Act SB soil boring SD sediment SI site investigation SMW shallow monitoring well SPLP synthetic precipitation leaching procedure SQC sediment quality criteria SRP Site Remediation Program SS surface soil SSI supplemental site investigation SVOC semivolatile organic carbon SW surface water

Aurora MGP Site iv SSI Report

ACRONYMS AND ABBREVIATIONS (Continued)

TACO Tiered Approach to Corrective Action Objectives TCL target compound list TICs tentatively identified compounds TOC total organic carbon TCLP toxicity characteristic leaching procedure USEPA United States Environmental Protection Agency USGS United States Geological Survey UST underground storage tank VOC volatile organic compound

Aurora MGP Site ES-1 SSI Report

EXECUTIVE SUMMARY In accordance with the Illinois Site Remediation Program, Nicor Gas, in cooperation with Commonwealth Edison, conducted a supplemental site investigation (SSI) at a former manufactured gas plant (MGP) site in Aurora, Illinois. This SSI report describes investigative activities and presents findings. Manufactured gas was produced at the Aurora MGP site from 1868 to 1912. The site is located on the west bank of the Fox River and on Hurds Island. The portion of the site on the west bank of the river extends on both sides of River Street from North Avenue, southwest to Prairie Street and is known as the East Facility, West Facility and Storeroom Facility. The Hurds Island portion (Hurds Island North) extends from the upstream end of Hurds Island to the Burlington Northern Railroad. Steck Park, located directly north of the East Facility, is included as an offsite study area, but did not historically contain MGP site activities or structures. The Aurora MGP site occupies approximately 14 acres: 1 acre on the West Facility; 1 acre on the Storeroom Facility; 4 acres on the East Facility; and 8 acres on Hurds Island North. Nicor Gas uses the East and West Facilities as an employee reporting center, for fleet maintenance and for storage of equipment and supplies. The Storeroom Facility, which was sold by Nicor Gas in 1999, is occupied by Americana Accents, Inc., a metal ceiling manufacturer. The East Facility property is fenced and covered by two buildings and paved parking lots. The West Facility is fenced and is covered by one building and a paved parking lot with gravel located along the western boundary of the facility. The Storeroom Facility property is fenced and is covered by one building and paved parking lots with the exception of a small grass covered section at the southeast corner of the property. Hurds Island North is a park with playing fields, picnic areas and parking. Mixed commercial and residential areas surround the site. The SSI activities presented herein were conducted as set forth in the Supplemental Site Investigation Work Plan [Burns & McDonnell (BMcD) 2000]. Field activities were conducted from November 2001 to January 2002. The SSI activities were conducted on the MGP site near the property boundaries of the East, West, and Storeroom Facilities as well as at one offsite location east of the Fox River and south of North Avenue. The overall objective of the Aurora MGP SSI was to further define the extent of MGP impacts to soil, groundwater and bedrock. Data will be used to aid in the development of remediation objectives, if necessary, and a groundwater transport model. The objective was achieved by conducting soil borings and bedrock corings, installing monitoring wells and collecting soil and groundwater samples. A total of 30 soil borings were advanced onsite, and one soil boring was advanced offsite. In addition, six deep and six shallow monitoring wells were installed onsite. The following is a summary of pertinent field observations at the site.


• Soil encountered near the middle of the eastern property boundary of the East Facility contained visually bluish-green impacted soil under the paved parking lot to depths of approximately eight feet below ground surface (bgs).

• Coal tar staining was noted on the soil samples collected in soil boring SB63 (located at the northeast corner of the East Facility near the former tar separator) from 18 feet bgs to bedrock. Light non-aqueous phase liquid (LNAPL) was observed in the shallow monitoring well that was later installed at this location (SMW15).

• A petroleum odor was detected while performing the soil boring at the northwest corner of the East Facility (SB54A) from approximately 3 to 20.5 feet bgs. No sheen was noted on the groundwater during the development of the associated well that was later installed at this location (DMW05); however, a petroleum odor was detected.

• During soil boring activities on the southwest corner of the Storeroom Facility portion (vicinity of former underground storage tanks), a petroleum odor was detected in boreholes SB50A and SB50B and in the associated soil cuttings. No soil staining was noted in these cuttings. No odors or sheen were noted during the development of the wells at these locations.

• During the development of DMW11, located near the middle of the west property boundary of the West Facility, a strong petroleum odor was detected, and a sheen was present.

• The soils encountered elsewhere on the East, West and Storeroom Facilities during SSI activities were visually clean and contained no odors. No odors were detected during drilling activities at the one offsite soil boring location (SB68), and soils were not observed to be visually impacted.

Analytical results from soil and groundwater samples are summarized as follows:

• Benzene, toluene, ethylbenzene and total xylenes (BTEX) and styrene were detected in one out of the 10 surface soil samples collected. The surface soil sample was collected near the middle of the eastern property boundary of the East Facility. None of the surface soil samples contained detectable concentrations of phenols. Polynuclear aromatic hydrocarbons (PAHs), metals and total cyanide were detected at varying concentrations across the site. The highest PAH and metal concentrations were also present near the middle of the eastern property boundary of the East Facility as well as on the Storeroom Facility. The highest concentration of cyanide was also present near the middle of the eastern property boundary of the East Facility.

• BTEX, styrene and phenolic compounds were not detected in the subsurface soil samples collected. PAHs were detected in 7 out of 8 subsurface soil samples at relatively low concentrations. Arsenic, barium, chromium and lead were detected in all 14 subsurface soil samples submitted for metals analysis. Overall the highest metal concentrations were detected near the southwest corner of the Storeroom Facility at a depth of 4 to 6 feet bgs (near the location of the former underground storage tanks).

• Two rounds of groundwater samples were collected in May 2001 and January 2002. The sample results between the two rounds were generally unchanged. Low concentrations of BTEX were detected in most of the groundwater monitoring wells. No detectable concentrations of phenols were detected during the May 2001 sampling event, and low concentrations of phenols were


detected in four wells during the January 2002 sampling event. Metals and PAHs were detected at low concentrations in most of the monitoring wells during both sampling events.

• The suspected LNAPL sample collected from SMW15 on January 22, 2002 (northeast corner of the East Facility) contained high concentrations of BTEX. The corresponding water sample collected immediately below the LNAPL sample contained significantly lower concentrations of BTEX. Styrene was non-detect in both of these samples.

The overall objectives of this SSI were met and the extent of MGP impacts has been defined. A complete evaluation of all existing data in accordance with Illinois Tiered Approach to Corrective Action Objectives (TACO) requirements will be prepared in forthcoming reports.

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Aurora MGP Site TC-1 SSI Report

TABLE OF CONTENTS

1.0 INTRODUCTION .......................................................................................................................... 1-1 1.1 INVESTIGATION PURPOSE AND REPORT ORGANIZATION ........................................... 1-1 1.2 SITE BACKGROUND ................................................................................................................ 1-2

1.2.1 Site Description ................................................................................................................... 1-2 1.2.2 Site History .......................................................................................................................... 1-2 1.2.3 Previous Investigations........................................................................................................ 1-3

2.0 FIELD ACTIVITIES...................................................................................................................... 2-1 2.1 SURFACE SOIL INVESTIGATION .......................................................................................... 2-1

2.1.1 Sample Locations and Depths ............................................................................................. 2-1 2.1.2 Boring and Sampling Procedures ........................................................................................ 2-2 2.1.3 Chemical Analysis ............................................................................................................... 2-2 2.1.4 Physical Analysis................................................................................................................. 2-2

2.2 SUBSURFACE SOIL INVESTIGATION................................................................................... 2-3 2.2.1 Sample Locations and Depths ............................................................................................. 2-3 2.2.2 Boring and Sampling Procedures ........................................................................................ 2-3 2.2.3 Chemical Analysis ............................................................................................................... 2-3 2.2.4 Physical Analysis................................................................................................................. 2-4

2.3 BEDROCK INVESTIGATION ................................................................................................... 2-4 2.3.1 Bedrock Coring Locations and Depths................................................................................ 2-4 2.3.2 Bedrock Coring Procedures................................................................................................. 2-4

2.4 GROUNDWATER INVESTIGATION....................................................................................... 2-4 2.4.1 Monitoring Well Locations.................................................................................................. 2-5 2.4.2 Monitoring Well Installation Procedures............................................................................. 2-5 2.4.3 Slug Tests ............................................................................................................................ 2-5 2.4.4 Groundwater Elevation Measurements................................................................................ 2-6 2.4.5 Sampling Procedures ........................................................................................................... 2-6 2.4.6 Chemical Analysis ............................................................................................................... 2-6

3.0 ENVIRONMENTAL CONDITIONS ........................................................................................... 3-1 3.1 METEOROLOGY........................................................................................................................ 3-1 3.2 TOPOGRAPHY, DRAINAGE AND HYDROLOGY ................................................................ 3-1


TABLE OF CONTENTS (Continued)

3.3 GEOLOGY AND HYDROGEOLOGY....................................................................................... 3-2

3.3.1 Regional Geology ................................................................................................................ 3-2 3.3.2 Site Geology ........................................................................................................................ 3-2 3.3.2.1 Fill Unit.................................................................................................................. 3-3 3.3.2.2 Granular Unit ......................................................................................................... 3-3 3.3.2.3 Cohesive Units....................................................................................................... 3-3 3.3.2.4 Bedrock Unit.......................................................................................................... 3-3 3.3.3 Offsite Geology ................................................................................................................... 3-4 3.3.4 Regional Hydrogeology....................................................................................................... 3-4 3.3.5 Site Hydrogeology ............................................................................................................... 3-5 3.3.6 Offsite Hydrogeology .......................................................................................................... 3-5

3.4 DEMOGRAPHICS AND LAND USE.......................................................................................... 3-6

4.0 FIELD OBSERVATIONS AND ANALYTICAL RESULTS..................................................... 4-1 4.1 FIELD OBSERVATIONS ........................................................................................................... 4-2 4.2 SURFACE SOIL RESULTS........................................................................................................ 4-2

4.2.1 Surface Soil BTEX and Styrene Results.............................................................................. 4-2 4.2.2 Surface Soil Phenol Results................................................................................................. 4-3 4.2.3 Surface Soil PAH Results .................................................................................................... 4-3 4.2.4 Surface Soil Metals and Cyanide Results ............................................................................ 4-3 4.2.5 Other Surface Soil Analytical Results ................................................................................. 4-3

4.3 SUBSURFACE SOIL RESULTS ................................................................................................ 4-4 4.3.1 Subsurface Soil BTEX and Styrene Results ........................................................................ 4-4 4.3.2 Subsurface Soil Phenol Results ........................................................................................... 4-4 4.3.3 Subsurface Soil PAH Results .............................................................................................. 4-4 4.3.4 Subsurface Soil Metals and Cyanide Results ...................................................................... 4-4 4.3.5 Other Subsurface Soil Analytical Results............................................................................ 4-4

4.4 GROUNDWATER INVESTIGATION RESULTS..................................................................... 4-5 4.4.1 Groundwater BTEX and Styrene Results ............................................................................ 4-5 4.4.2 Groundwater Phenol Results ............................................................................................... 4-5 4.4.3 Groundwater PAH Results .................................................................................................. 4-5 4.4.4 Groundwater Metals and Cyanide Results........................................................................... 4-6 4.4.5 Other Groundwater Analytical Results................................................................................ 4-6



5.0 CONCLUSIONS............................................................................................................................. 5-1 5.1 SUFFICIENCY OF DATA .......................................................................................................... 5-1 5.2 RECOMMENDATIONS FOR FURTHER INVESTIGATION.................................................. 5-1

6.0 REFERENCES ............................................................................................................................... 6-1

Tables

Table 1 Surface Soil Sample Analysis Table 2 Subsurface Soil Sample Analysis Table 3 Bedrock Boring Descriptions Table 4 Groundwater Monitoring Well Screen Information Table 5 Groundwater Sample Analysis Table 6 Groundwater Elevations Table 7 Hydraulic Conductivity Results Table 8 Surface Soil Analytical Results Table 9 Potential Source Material Analytical Results Table 10 SPLP Metals and Cyanide Analytical Results Table 11 Subsurface Soil Analytical Results Table 12 May 2001 Groundwater Analytical Results Table 13 January 2002 Groundwater Analytical Results Table 14 January 2002 Groundwater Additional Analytical Results Table 15 Geophysical Analytical Results for Select Soil Samples

Figures Figure 1 Site Location Map Figure 2 Surrounding Area Base Map Figure 3 Site Layout Map Figure 4 Historical Layout Map Figure 5 2001 Supplemental Site Investigation Activities Figure 6 Groundwater Monitoring Well Location Map Figure 7 Geological Cross Section Location Map Figure 8 Geological Cross Sections A-A’ and B-B’ Figure 9 Geological Cross Section C-C’ Figure 10 Geological Cross Section D-D’ Figure 11 Shallow Groundwater Contour Map Figure 12 Deep Groundwater Contour Map



Appendices

Appendix A 1993-1994 Fox River Sediment and Water Column Analytical Results Tables and Investigation Activities Map

Appendix B 1995-1996 Site Investigation Analytical Results Tables and Investigation Activities Maps Appendix C Hurds Island North Investigations Analytical Results Tables and Investigation

Activities Maps Appendix D Storeroom Facility SI Analytical Results Tables and Investigation Activities Map Appendix E Structure Area Analytical Results Tables and Investigation Activities Map Appendix F Soil and Bedrock Drilling Logs Appendix G Well Installation Logs Appendix H Slug Test Data Analysis Appendix I Geophysical Analysis Laboratory Data Sheets

Aurora MGP Site 1-1 SSI Report

1.0 INTRODUCTION

In accordance with the Illinois Site Remediation Program (SRP), Nicor Gas, on behalf of Nicor Gas and Commonwealth Edison, conducted supplemental site investigation (SSI) activities at a former manufactured gas plant (MGP) site in Aurora, Illinois. This SSI report describes investigative activities and presents findings. 1.1 INVESTIGATION PURPOSE AND REPORT ORGANIZATION This SSI was conducted as set forth in the Supplemental Site Investigation Work Plan [Burns & McDonnell (BMcD) 2000]. The SSI was originally designed in response to the city of Aurora’s request to investigate soil conditions under River Street and North Avenue. However, since the city of Aurora did not provide access along River Street and North Avenue, the SSI activities were conducted on the MGP site near the property boundaries of the East Facility, West Facility and the Storeroom Facility as well as at one offsite location east of the Fox River and south of North Avenue. The overall objective of the Aurora MGP SSI was to further define the extent of MGP impacts to soil, groundwater and bedrock. Data will be used to aid in the development of remediation objectives, if necessary, and a groundwater transport model. The objective was achieved by conducting soil borings and bedrock coring, installing monitoring wells, and collecting soil and groundwater samples. The following specific objectives were established to achieve the overall SSI objective:

• Determine whether surface soils, subsurface soils and bedrock contain MGP residuals, and if present, define the nature and extent of impacted areas.

• Determine whether groundwater has been impacted. • Determine whether or not metal concentration exceedences are indicative of metal migration from soil

to groundwater. • Obtain sufficient groundwater data to prepare a groundwater transport model.

This SSI report is organized into the following six sections:

• Section 1.0–Introduction This section discusses the SSI purpose and summarizes site background information, including a site description, site history and previous investigations.

• Section 2.0–Field Activities This section describes field activities, which included surface and subsurface soil investigations,

monitoring well installation and groundwater investigations. • Section 3.0–Environmental Conditions

This section describes physical characteristics of the site. It includes regional and site-specific meteorological, topographical, drainage, geological, demographic and land use information.

• Section 4.0–Field Observations and Analytical Results This section provides a summary of field observations and analytical results.


• Section 5.0–Conclusions This section discusses the sufficiency of the SSI data and presents recommendations for any additional work required to evaluate the site.

• Section 6.0–References

1.2 SITE BACKGROUND 1.2.1 Site Description The Aurora MGP site is located in the city of Aurora, Kane County, Illinois, Township 38 North, Range 8 East, Section 21 as shown in Figure 1. The site is located on the west bank of the Fox River and on Hurds Island. The portion of the site on the west bank of the river extends on both sides of River Street from North Avenue, southwest to Prairie Street and is known as the East Facility, West Facility and Storeroom Facility. The Hurds Island portion (Hurds Island North) extends from the upstream end of Hurds Island to the Burlington Northern Railroad. Steck Park, located directly north of the East Facility, is included as an offsite study area but did not historically contain MGP site activities or structures. The Aurora MGP site occupies approximately 14 acres: 1 acre on the West Facility; 1 acre on the Storeroom Facility; 4 acres on the East Facility; and 8 acres on Hurds Island North. Nicor Gas uses the East and West Facilities as an employee reporting center, for fleet maintenance and for storage of equipment and supplies. The Storeroom Facility, which was sold by Nicor Gas in 1999, is occupied by Americana Accents, Inc., a metal ceiling manufacturer. The East Facility property is fenced and covered by two buildings and paved parking lots. The West Facility is fenced and is covered by one building and a paved parking lot with gravel located along the western boundary of the facility. The Storeroom Facility property is fenced and is covered by one building and paved parking lots with the exception of a small grass covered section at the southeast corner of the property. Hurds Island North is a park with playing fields, picnic areas and parking. Figure 2 presents the site and surrounding residential and commercial properties. Figure 3 presents the site layout, including major features surrounding the site and existing site conditions.

1.2.2 Site History The Aurora MGP site was active from 1868 to 1912. After 1912, portions of the facility were retained to help supply and store gas for peak demand until the early 1950s. Coal gas and water gas manufacturing processes were used to produce an average of 284 million standard cubic feet (ft3) per year of gas [U.S. Environmental Protection Agency (USEPA) 1985]. Figure 4 presents the historical site layout. In 1868, the Aurora Gas Light Company first produced gas in a plant on the western bank of the Fox River just south of North Avenue. In 1889, another gas company was formed and caused a rate war, which ended in the old company buying out the new company and becoming the Aurora Electric Light & Power Company (Aurora Beacon-News 1926). The East Facility contained tar and oil tanks, two gas holders with 40,000 and 100,000 ft3 capacities, a main production building and a gas purifying building


(Sanborn Map and Publishing Company 1897). In 1902, the company name was changed to the Fox River Light, Heat and Power Company when it was acquired by another company. In 1905, the company merged with three others (Joliet Gas Light Company, LaGrange Gas Company and Elgin American Gas Company) to form Western United Gas and Electric Company (Aurora Beacon-News 1926). A 300,000 ft3 gas holder was added to the center of the East Facility. Coke yards, retorts, coal sheds and ammonia tanks were located on the West Facility (Sanborn Map and Publishing Company 1907). Production in Aurora stopped in 1912 when a gas plant in Lockport began to produce all of the gas for Western United Gas and Electric Company. Gas for the city of Aurora was transported by pipeline to Aurora and stored on Hurds Island in a 2 million ft3 gas holder (Aurora Beacon-News 1946). No Sanborn maps are available that indicate the location or existence of this gas holder; however, historical photographs and a 1985 aerial photograph (Sidwell map) indicate that this gas holder was located on the northern end of Hurds Island near the North Avenue bridge. In 1950, Western United Gas and Electric Company and Illinois Northern Utilities became part of the Public Service Company of Northern Illinois. In 1953, Public Service’s gas and electric operations were merged into Commonwealth Edison. The following year, Commonwealth Edison spun off its gas properties to Northern Illinois Gas (Nicor Gas, formerly Northern Illinois Gas, 1992). Over the years, buildings and parking lots were built over most of the site. The building now used as a maintenance facility was built in 1925; originally, it was a trolley car repair center. According to Nicor Gas employees, the Hurds Island gas holder was demolished in the early 1950s. Demolition dates of the three East Facility gas holders are unknown; however, Sanborn maps (1950 and fragments of 1941) indicate the 40,000 ft3 holder were demolished prior to 1941 and the other two prior to 1950. Nicor Gas obtained the property on Hurds Island from Commonwealth Edison on February 9, 1954, and sold it to the present owner, Fox River Pleasure Driveway and Park District, on March 13, 1964. Nicor Gas sold the southern half of the West Facility (currently referred to as the Storeroom Facility) to Last Resort, Inc. in 1999.

1.2.3 Previous Investigations In 1992, preliminary site assessments were performed for 15 properties in the Nicor Gas service area that were former MGP locations. In September 1992, the preliminary site assessments were completed. A site investigation/prioritization plan was prepared and submitted to Nicor Gas. Based on recommendations made in the site investigation/prioritization plan and subsequent meetings with Nicor Gas representatives, a site reconnaissance of the Aurora MGP site and Hurds Island was conducted on September 16, 1993. This reconnaissance identified areas of potential MGP byproduct accumulation and evaluated potential Fox River sediment and water column sampling locations. On September 27, 1993,


sediment samples were collected from the Fox River adjacent to the Aurora MGP site. On October 6, 1993, water column samples were collected from the Fox River adjacent to the site. Sampling was conducted to evaluate whether effects from historical MGP activities were evident in river sediments and water. Sample results from the sediment and water column sampling events are discussed in the Fox River Sampling Event I Report [Black & Veatch Waste Sciences, Inc. (BVWS) 1994]. The report concluded that no benzene, toluene, ethylbenzene and total xylenes (BTEX) or polynuclear aromatic hydrocarbons (PAHs) compounds were detected in the Fox River water. PAHs and BTEX were detected in sediments along the western bank of the Fox River adjacent to the Aurora MGP site. A background sample was obtained from the west bank of the river, just upstream of the Aurora MGP site. The source of PAHs and BTEX detected along the west bank was uncertain because detected concentrations of BTEX and PAHs were present in the background sample. Based on September 1993 sediment sampling results, additional investigation activities were performed in 1994. Additional sediment deposit areas were mapped and outfall pipes and structures entering the Fox River were identified on the river banks approximately 0.5 mile upstream and 1 mile downstream of the site. Additional sediment samples were collected from the Fox River, upstream and downstream of the site, including a background sample (SD17) collected further upstream than the 1993 background sample. Sediment samples were collected and analyzed for TOC to compare to USEPA sediment quality criteria (SQC). July 1994 sediment sampling activities are discussed in the Fox River Sampling Event II Report (BVWS 1995a). A small seep was identified during July 1994 activities at a sediment deposit area along the western bank of the Fox River adjacent to the site. BTEX, PAHs, arsenic, lead and cyanide concentrations in samples collected in 1993 and 1994 exceeded concentrations in background sample SD17. The highest PAH concentrations were found in sediment sample SD4, located adjacent to the Aurora MGP site. Sample SD4 also exceeded the SQC value for phenanthrene, and an ecological risk screening assessment was recommended based on this result. Appendix A presents the Fox River sediment and water column analytical results tables and investigation activities map. On April 26, 1995, an ecological site survey of the Aurora MGP site was conducted based on sediment sampling results. An Ecological Risk Screening Assessment (BVWS 1995b) was prepared based on the survey. The assessment indicated fish sampling was not warranted, but further investigation of surface soils in the floodplain area on Hurds Island was necessary to fully evaluate ecological risk to terrestrial receptors. A site investigation (SI) was conducted at the Aurora MGP site [Black & Veatch (B&V) 1998a]. Field activities began on October 19, 1995 and were completed on January 26, 1996. During the SI, four hand auger borings, 32 soil borings with some with bedrock coring, and 54 soil probes were drilled on the Aurora MGP site. Fifteen monitoring wells were installed. Surface soils contained PAHs, metals and total cyanide. Subsurface soils contained BTEX, styrene, PAHs, metals and total cyanide. Four subsurface soil samples


contained diesel and one subsurface soil sample had a flashpoint exceeding the hazardous limit for ignitability. Groundwater samples from shallow and deep monitoring wells contained BTEX, styrene, PAHs and metals. Groundwater samples from shallow monitoring wells also contained total petroleum hydrocarbons (TPH). A supplemental SI was recommended because the extent of MGP-related impacts in both soil and groundwater was not fully defined. Appendix B presents the 1995-1996 SI analytical results tables and investigation activities maps. A seismic refraction survey was conducted during July and August 1997 at the Aurora MGP site and in surrounding areas. The objective of the geophysical investigation was to collect P-wave seismic refraction data to image the bedrock interface between the unconsolidated (alluvial and glacial) deposits and the underlying dolomite. The interpreted seismic data correlated with information obtained from drilling and provided information about the bedrock topography. Surface soil sampling activities were conducted on Hurds Island in June 1997. Fifty-one primary surface soil samples were collected for chemical analysis using soil probing. It was determined that surface soils on the Hurds Island soccer field required no further action as reported in the Hurds Island Soccer Field Surface Soil Investigation Report (BVWS 1997). The Fox Valley Park District subsequently re-graded, added topsoil and re-seeded the soccer field. Appendix C presents the Hurds Island 1997 surface soil analytical results tables and investigation activities map. Additional SI field activities were conducted on Hurds Island and two upstream islands, Veterans Island and Gregory Island, in March 1998. Surface samples were collected on Veterans Island and Gregory Island to establish background conditions. The field activities consisted of three test pits, 40 soil probes, and one dense non-aqueous phase liquid (DNAPL) pump test. Samples were analyzed for BTEX, styrene, phenols, PAHs, metals and cyanide. Selected samples were analyzed for toxicity characteristic leaching procedure (TCLP) volatile organic carbons (VOCs), TCLP base neutral acids (BNAs), TCLP metals, density, extractable organic halogens (EOX), oil and grease, pH, polychlorinated biphenyls (PCBs) and paint filter. In August 1998, subsurface soil samples were collected on Hurds Island North and analyzed for specific Illinois Tiered Approach to Correction Action Objectives (TACO) requirements [Illinois Administrative Code (IAC) 742] to determine if source material was present. Samples were collected at soil probes SP142, SP143 and SP144. All SI field activities and sample data from Hurds Island, excluding groundwater, are summarized in the Hurds Island Site Investigation Report (B&V 1998c). Appendix C presents the Hurds Island SI analytical results tables and investigation activities maps. An evaluation of Hurds Island soils was performed in accordance with TACO. The evaluation concluded that no source material, as defined in TACO, was present on Hurds Island. However, Tier 1 screening levels were exceeded for the soil ingestion pathway and the soil component of the groundwater ingestion pathway. A risk assessment was conducted which concluded that no further action is necessary on the Hurds Island soils to mitigate soil ingestion, dermal contact and inhalation exposure routes. This evaluation is presented in the Aurora MGP Site Hurds Island Remediation Objectives Report (B&V 2000).


A specific SI was performed at the Storeroom Facility in June 1999. The Storeroom Facility SI was performed to identify site geologic conditions and to evaluate the nature and extend of MGP-related impacts in surface soils, subsurface soils and groundwater. Twenty-three soil probes were advanced at the site and four surface soil, 19 subsurface soil and six groundwater samples were collected. The impacts (BTEX, PAHs and inorganic analytes) appeared to have originated from coal tar and oil products related to past MGP activities. MGP impacts were found in surface soils, subsurface soils and groundwater. Chlorinated compounds were detected in groundwater. These compounds appeared to reflect background conditions at the site, unrelated to past MGP activities. Sampling procedures and results are presented in the Aurora MGP Site Storeroom Facility Site Investigation Report (B&V 1999b). Appendix D presents the Storeroom SI analytical results tables and investigation activities map. An Illinois Environmental Protection Agency (Illinois EPA) Leaking Underground Storage Tank Program 45 Day Report was prepared in November 1999 for the Storeroom Facility (B&V 1999c). The report discusses two 10,000-gallon gasoline underground storage tanks (USTs) identified on the west side of the Storeroom Facility during the Storeroom SI activities. The tanks were removed in September and October 1999. A structure area investigation was conducted in September and October 1999. Soil borings were performed inside the three East Facility gas holders to characterize subsurface soils and evaluate potential source material. Test pits TP1 and TP2 verified that the 40,000 ft3 gas holder was partially under an existing building on the East Facility, and test pit TP3 was performed to evaluate whether subsurface structures exist in the northeast portion of the East Facility as indicated on a 1926 Sanborn fire insurance map. Appendix E presents the analytical results tables and investigation activities map. Interim remedial activities were conducted from April to August 2000 and consisted of the removal of source material contained within the 40,000 ft3 gas holder, the 100,000 ft3 gas holder, the 300,000 ft3 gas holder, the tar separator and a 10,000-gallon non-regulated processing tank on the East Facility. The work was performed according to the Structure Area Interim Remedial Action Plan (BMcD 1999) to reduce or eliminate migration of source material to surrounding soil and groundwater. Approximately 14,000 tons of non-hazardous and hazardous materials were successfully removed. However, these remedial actions did not constitute complete corrective action at the MGP site.

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2.0 FIELD ACTIVITIES

In general, the SSI field activities were performed in accordance with the work plan, except where field conditions warranted changes (e.g., adjustments to number and placement of soil borings and monitoring wells). SSI activities were performed in two phases. Phase I field activities consisted of boring advancement, rock coring, and monitoring well installation from November 7 to December 18, 2001. A total of thirty-one borings were advanced and six deep bedrock aquifer and six shallow aquifer monitoring wells were installed. In addition, two hand-augered soil samples and one surface soil sample were collected onsite.

• On the East Facility, fifteen borings were advanced, one deep and one shallow monitoring well were installed and two hand-augered soil samples were collected.

• On the West Facility, seven borings were advanced and two deep and two shallow monitoring wells were installed.

• On the Storeroom Facility, eight borings were advanced and three deep and three shallow monitoring wells were installed, along with the collection of the surface soil sample.

• At an offsite location on the east bank of the Fox River at the southeast corner of the intersection of North Avenue and the river, one boring was advanced.

Figure 5 presents the SSI investigation activities map. During Phase II field activities, which occurred on December 18, 27 and 28, 2001 and between January 18 and 25, 2002, slug tests were performed, low-flow pumps were installed, and groundwater samples were collected from the site monitoring wells. 2.1 SURFACE SOIL INVESTIGATION A surface soil investigation was conducted during Phase I activities. Twenty surface soil samples were collected from soil borings, hand augers and surficial soil throughout the site to characterize the surface soil. Table 1 presents surface soil sample depths, sample descriptions and associated chemical analyses. Figure 5 presents surface soil sampling locations, and Appendix F contains the soil and bedrock drilling logs. 2.1.1 Sample Locations and Depths Surface samples were collected from the East Facility, West Facility and Storeroom Facility at various depths within the upper 3 feet bgs. One hand-dug surface soil sample was collected from 0 to 0.5 feet bgs at the southeast corner of the Storeroom Facility. Surface soil samples were collected near property boundaries and at depths described in the work plan. Since the city of Aurora did not provide access to North Avenue and South River Street, the sample locations depicted in the work plan could not be used.


2.1.2 Boring and Sampling Procedures At each soil boring location, soil samples were collected with a 3-inch split barrel sampler as described in the work plan. At the hand-dug soil sample location SS63, vegetation and the top inch of soil were removed with a clean hand shovel prior to collection of the soil sample. Two soil samples were collected on the East Facility along the Fox River using a stainless steel hand auger. BTEX and styrene samples were collected in accordance with USEPA SW-846 Method 5035 using the Powerstop HandleTM sampling method. Sample portions collected for PAHs, phenols, metals and total cyanide were placed in stainless steel bowls and mixed to homogenize the sample before placement in appropriate sample containers. The container lids were secured. Samples were labeled and placed on ice in a cooler for transport to the analytical laboratory. All equipment was decontaminated between samples. All borings were backfilled with cement bentonite grout slurry using the tremie method, which consists of placing the tremie pipe at the bottom of the hole and pumping slurry down the annular space through the pipe while removing equipment from the hole. All holes were backfilled to approximately 6 inches bgs and then filled with topsoil or asphalt patch depending on the location. 2.1.3 Chemical Analysis The surface soil samples were analyzed for the following parameters:

• BTEX. • Styrene. • Phenols. • PAHs. • Metals. • Total cyanide (and amenable cyanide if total cyanide was detected).

In addition, select surface soil samples containing visual impacts of potential source material were analyzed for target compound list (TCL) volatile organic compounds (VOCs) and TCL semivolatile organic compounds (SVOCs). Select samples were also analyzed for synthetic precipitation leaching procedure (SPLP) metals and SPLP cyanide. 2.1.4 Physical Analysis Physical analyses were performed on select surface soil samples. Analyses included pH and total organic carbon (TOC).


2.2 SUBSURFACE SOIL INVESTIGATION Subsurface soil investigation activities were also conducted during Phase I activities. Sixteen subsurface soil samples were collected throughout the East Facility, West Facility and Storeroom Facility at depths greater than three feet to characterize subsurface soil conditions. In addition, three samples were collected from an offsite soil boring for physical characterization of soil. Table 2 presents subsurface soil sample depths, sample descriptions and associated chemical and physical analyses. Figure 5 presents subsurface soil sampling locations, and Appendix F contains the soil and bedrock drilling logs. 2.2.1 Sample Locations and Depths Subsurface soil samples were collected from the East Facility, West Facility and Storeroom Facility at various depths greater than 3 feet bgs. Onsite subsurface soil samples were collected near property boundaries and at depths described in the work plan. Since access was not provided by the city of Aurora to North Avenue and South River Street, the sample locations depicted in the streets were not used. Three offsite geophysical soil samples were collected at representative granular soil intervals at soil boring SB68, which is located just east of the Fox River in an area bounded by North Avenue to the north and railroad tracks to the east. One Shelby tube sample was collected at each respective interval of 26 to 28 feet, 28 to 30 feet and 30 to 32 feet bgs. The boring was terminated at 48 feet bgs where local bedrock was encountered. Granular soil samples were tested for hydraulic conductivity, grain size distribution, specific gravity, moisture content and bulk density. 2.2.2 Boring and Sampling Procedures Except for the Shelby tube subsurface soil samples, soil boring and subsurface soil sampling were conducted in the same manner as the boring and sampling procedures described in Section 2.1.2 for surface soil samples. Following collection of the Shelby tube samples, the void space in the tube was filled with paraffin wax and ends were covered with a plastic cap secured with tape. Each Shelby tube was appropriately labeled in preparation for transport to the analytical laboratory. 2.2.3 Chemical Analysis Subsurface soil samples were analyzed for the following parameters:

• BTEX. • Styrene. • Phenols. • PAHs. • Metals. • Total cyanide (and amenable cyanide if total cyanide was detected).

Select subsurface soil samples were also analyzed for SPLP metals and SPLP cyanide.


2.2.4 Physical Analysis Physical analyses were performed on select subsurface soil samples. Analyses included pH, TOC, grain size distribution, hydraulic conductivity, specific gravity, moisture content and bulk density. 2.3 BEDROCK INVESTIGATION Six borings were advanced into bedrock for characterization of bedrock and the installation of deep monitoring wells. Bedrock coring was performed onsite at SB47A, SB48C, SB49B, SB50A, SB51A and SB54A. Table 3 presents a description of each boring advanced into bedrock. Figure 5 depicts rock core boring locations, and Appendix F contains the soil and bedrock drilling logs. 2.3.1 Bedrock Coring Locations and Depths Bedrock coring was performed at soil boring locations near the property boundaries of the West Facility and Storeroom Facility. In addition, bedrock coring was performed at one location at the northwest corner of the East Facility. Each rock core boring was advanced into bedrock to a depth that allowed for the same monitoring well screening as previously installed wells (approximately 55 feet bgs). As previously discussed, the coring locations identified in the work plan were not used since access to offsite sampling locations was not provided by the city of Aurora. 2.3.2 Bedrock Coring Procedures Before drilling into bedrock, permanent 8-inch black steel casing was installed along the length of the overburden portion of the borehole, embedded within competent bedrock and cement grouted in place. This was done to prevent accidental migration of potential impacts in the overburden into the bedrock. Rock coring was performed in accordance with American Society for Testing and Materials (ASTM) Method D 2113. Water used to remove the cuttings consisted of clean, potable water, with no drilling mud or chemical additives. Boreholes advanced into bedrock used a 3-7/8-inch outside diameter HQ wireline core barrel. After the core was removed from the bedrock, it was placed in durable boxes with appropriate spacers and labeled. The rock core was placed on a table and examined to determine geology and if any MGP-related impacts were present in the bedrock. 2.4 GROUNDWATER INVESTIGATION In order to evaluate hydrogeologic conditions at the site, six additional shallow and six additional deep monitoring wells were installed onsite in nested sequence to monitor the overburden and bedrock aquifers. During Phase II field activities, groundwater samples were collected from newly installed and existing monitoring wells. The following subsections describe well locations, installation procedures and sampling procedures for the monitoring wells. Table 4 presents monitoring well screen lengths, material, intervals and geologic units screened. Figure 6 presents locations of the newly installed monitoring wells, and Appendix G contains the well installation logs.


2.4.1 Monitoring Well Locations Since offsite access was not available for monitoring well installation, monitoring wells were located onsite as close to property boundaries as possible. The locations and types (shallow or deep) of wells are as follows: • One shallow monitoring well and one deep monitoring well were installed at the north end of the East

Facility (SMW15 and DMW05). • One shallow monitoring well and one deep monitoring well were installed on each of the east (SMW10

and DMW10) and west (SMW11 and DMW11) property boundaries of the West Facility. • One shallow monitoring well and one deep monitoring well were installed on each of the east (SMW12

and DMW12), south (SMW13 and DMW13) and west (SMW14 and DMW14) property boundaries of the Storeroom Facility.

2.4.2 Monitoring Well Installation Procedures Monitoring wells were constructed of threaded two-inch diameter, flush-jointed schedule 5 type 304 stainless steel. Well screens constructed of similar material had 0.010-inch slots and were five feet long for shallow wells and 10 feet long for deep wells. A capped one-foot section of blank stainless steel pipe was welded to the bottom of each screen as a silt trap. Fine to medium grained washed silica sand was placed around each monitoring well screen to two feet above the top of each screen. A two-foot minimum bentonite pellet seal was placed above the sand and hydrated with potable water. A bentonite grout slurry was then added to approximately two feet bgs as a seal for all wells. Protective flush-mount steel covers were installed in concrete pads over each well. Each well was developed using a portable electric pump at least 24 hours after installation by pumping a minimum of 5 well volumes of water or until the well was pumped dry. After the monitoring wells were developed, a steel nut attached to a cotton strip was lowered to well bottoms to determine if DNAPL was present within the wells. A low-flow sampling system was then installed into each well, with the exception of shallow monitoring well SMW15 which contained LNAPL. The pumps were situated in each individual well such that the intake for the pump was located in the center of the screen interval. Teflon-lined polyethylene tubing connected the pump to the well plate, which was fitted to the top of the well casing. An air compressor with a control module and a water discharge line were connected to the sampling port during sampling events. 2.4.3 Slug Tests Prior to installation of low flow pumps, slug tests were performed on the newly installed deep monitoring wells and on five of the six newly installed shallow monitoring wells (the sixth well contained LNAPL). Slug tests were performed using an in-situ data logger with pressure transducer in connection with a slug bomb constructed of polyvinyl chloride (PVC) piping of known volume to measure falling head. Data points were recorded and transferred in the field to a portable computer. Methods developed by Bouwer


and Rice for unconfined aquifers and Hvorslev for confined aquifers were used to analyze falling head data obtained during slug tests and calculate hydraulic conductivity for each well. 2.4.4 Groundwater Elevation Measurements Prior to sampling, groundwater elevations were measured in onsite and offsite monitoring wells. Groundwater elevations were recorded using an electronic water level indicator. Monitoring well covers and well caps were removed and each well was allowed to stabilize to atmospheric pressure before measurements were collected. 2.4.5 Sampling Procedures During Phase II activities, groundwater samples were collected from all site monitoring wells, except SMW15 which contained LNAPL, using low-flow sampling procedures. A closed atmospheric flow-cell was attached in series immediately after the well head discharge port to record pH, oxidation-reduction potential (ORP), conductivity, temperature, turbidity and dissolved oxygen during purging until all parameters stabilized. Upon stabilization, samples were collected and immediately transferred into clean sampling jars, the jar lids were secured, and samples were placed on ice in a cooler. The groundwater samples collected from shallow monitoring well SMW15 were collected using disposable bailers. Samples were collected after three volumes of water were removed from the well. Figure 6 presents all existing monitoring well locations. 2.4.6 Chemical Analysis Groundwater samples were analyzed for the following parameters as summarized in Table 5:

• BTEX. • Styrene. • Phenols. • PAHs. • Metals. • Total cyanide.

In addition, groundwater samples were also analyzed for alkalinity, sulfate, chloride, ferric iron, ferrous iron, nitrite/nitrate, iron and magnesium. Select groundwater samples were also field filtered during sampling for metals, cyanide, iron and magnesium.

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3.0 ENVIRONMENTAL CONDITIONS This section describes the environmental setting as well as geologic and hydrogeologic conditions at the Aurora MGP site.

3.1 METEOROLOGY The climate in Kane County is typical of northern Illinois. The average daily temperature is 48.4 degrees Fahrenheit (°F). The lowest average daily temperature is 19.7°F in January, and the highest average daily temperature is 73.1°F in July. The total annual precipitation is 36.88 inches. Of this, about 24 inches (64%) usually falls in April through September. The average seasonal snowfall is 30.6 inches (Midwest Climatic Data Center 2002). The prevailing wind is from the west.

3.2 TOPOGRAPHY, DRAINAGE AND HYDROLOGY The topography of the site is relatively flat, with an elevation approximately 640 feet above mean sea level. The West Facility is relatively flat with a gradual slope inward toward a central storm sewer collection point at the center of the parking lot facility. The highest ground surface elevations are at the northeast corner. The Storeroom Facility is also relatively flat with a gradual slope to the north towards a central storm sewer collection point as well as to the west towards the adjacent property. The East Facility is also predominantly flat with a sharp embankment drop off (about 20 feet) to the Fox River. Surface runoff for the East Facility enters storm sewer inlets located throughout the site and discharge into the Fox River along the sharp embankment or collect in water drains that line Prairie Street and River Street. Hurds Island drops gradually about 15 feet from North Avenue to the park. The park is relatively flat except at the riverbanks, where the surface gradually slopes into the Fox River. The Fox River is part of the upper Illinois River drainage basin which drains 10,949 square miles of land. The Fox River is the main drainage way for eastern Kane County. The Fox River’s headwaters are in southern Wisconsin and it drains approximately 1,700 square miles by the time it reaches Aurora, Illinois (USGS 1991). The river has an annual mean discharge of 1,193 cubic feet per second (cfs), with a high daily mean of 4,470 cfs and a low daily mean of 222 cfs as recorded at the South Elgin, Illinois gauging station (USGS 1991). The Fox River is a meandering river with occasional braids. In the vicinity of the site, the water is murky and carries a fair amount of suspended load consisting of silts and clays. The river bottom is generally made up of gravels, cobbles and boulders with occasional, intermittent lenses of fine-grained deposition. The Fox River and tributaries are prone to flooding during times of abnormally high rainfall. According to the Federal Emergency Management Agency (FEMA), an eastern portion of the East Facility and the Fox River are in the 100-year floodplain; the remaining area of the Aurora MGP facility is outside of the 500-year floodplain. Hurds Island is in the 100-year floodplain (FEMA 1989).


3.3 GEOLOGY AND HYDROGEOLOGY 3.3.1 Regional Geology The geology of the city of Aurora and Kane County, Illinois, consists of unconsolidated glacial and alluvial deposits, which were deposited by the Lake Michigan Lobe of the Wisconsin glacier approximately 13,500 years ago, overlying bedrock of Devonian, Silurian, Ordovician and Cambrian age (H.B. Willman 1975). Unconsolidated glacial and alluvial deposits in the city of Aurora and in Kane County vary in thickness from less than one foot along the Fox River, where bedrock is exposed, to as much as 300 feet thick near the northwest corner of Kane County (Woller and Sanderson 1978). Deposits closest to the river generally consist of well sorted sands and gravels with minor beds of silt that vary in thickness from less than one foot up to 15 feet (Woller and Sanderson 1978, Lineback 1979). As the distance from the Fox River increases, so does the thickness and clay content of the unconsolidated deposits. Aurora municipal well logs from wells approximately 2 miles east of the Fox River near the site indicate that unconsolidated materials consist of up to 130 feet of glacial or alluvial deposits, of which approximately 40 feet are clay (Woller and Sanderson 1978). Beneath the unconsolidated glacial deposits, upper bedrock formations consist primarily of dolomite, shale and sandstone, which dip easterly at about 10 feet per mile (Woller and Sanderson 1978). The first bedrock unit encountered, the Silurian dolomite, immediately underlies unconsolidated deposits in Aurora (Woller and Sanderson 1978, Bergstrom 1955). The Silurian dolomite is termed argillaceous because a notable portion of its composition is clay minerals. It is described as a white to gray to green, silty, cherty dolomite (Woller and Sanderson 1978, Bergstrom 1955). These rocks are encountered near the land surface in Kane County, specifically in the Fox River valley, and range in thickness from 50 to 150 feet (Woller and Sanderson 1978). Municipal well logs indicate an approximate thickness of 50 feet beneath Aurora. The Maquoketa Group of Ordovician age underlies the Silurian dolomite and is described as a red to maroon to brown to gray, silty, dolomitic and oolitic shale (Woller and Sanderson 1978). These shales lie at depths from about 50 feet to over 200 feet and vary in thickness from 25 feet to over 170 feet (Woller and Sanderson 1978). 3.3.2 Site Geology During SSI field activities, 30 soil borings ranging in depths from four to 56.5 feet were advanced at the Aurora MGP site and in one offsite area just east of the site. Six of these borings were advanced using rock coring methods into the local bedrock. Site geology was characterized during advancement of these soil borings and continued into bedrock and recorded on soil and bedrock drilling log forms, which are included in Appendix F. The following stratigraphic units, listed in descending order, were identified: fill; granular unit; laterally discontinuous cohesive units; and dolomite bedrock. The following


paragraphs describe each stratigraphic unit. Geologic cross sections were prepared from boring logs. Figure 7 presents plan locations of these cross sections; and Figures 8 through 10 show geologic cross sections. 3.3.2.1 Fill Unit The initial soil unit of the site consists of 0 to 7 feet of previously disturbed fill material (mostly clayey silt, sand, brick, gravel, concrete, cinders and clay). Fill material was generally encountered at greater depths along the edge of the property bordering the Fox River. Fill materials in the south portion of the West Facility consist of topsoil, sand, clayey silt and clay. 3.3.2.2 Granular Unit Except in isolated areas where cohesive units were encountered, native unconsolidated glacial and alluvial deposits underlie the fill. The alluvial deposits consist mainly of loose poorly sorted, rounded to sub-angular, sandy gravel containing cobbles and boulders, with amounts of sand and silty sand and occasional lenses of silt, sand or clay. The alluvial sands and gravels were deposited in the channels and floodplain of the Fox River following the last glaciation. These sands and gravels were encountered at depths ranging from approximately four feet bgs to just above the bedrock surface in some areas and appeared brown to tan in color. 3.3.2.3 Cohesive Units The main cohesive unit encountered consists of gray, very stiff, dry, low plasticity silty clay. The silty clay was sporadically encountered just above bedrock and contained small amounts of sub-rounded fine gravels. The discontinuous silty clay was encountered approximately 20 to 30 feet deep and follows the bedrock surface contour with an average thickness of two to five feet. Other laterally discontinuous cohesive units were encountered intermittently across the study area and were of minimal thickness, usually two to five feet thick. These other cohesive units tended to consist of light gray to brown silty clays of medium to stiff consistency and were generally moist. 3.3.2.4 Bedrock Unit Silurian bedrock composed mainly of dolomite (a limestone-like rock which contains more magnesium than calcium) immediately underlies the unconsolidated sands and gravels or discontinuous cohesive units. The bedrock observed was a light greenish-gray to weak red to white mottling, finely crystalline, thick to massively bedded with one-half to one inch olive green shale partings that tended to grade in approximately five to 25 feet below the top of bedrock. Some portions of the bedrock contained solution cavities filled with calcite and chert that gave a vuggy appearance. Sizes of the solution cavities ranged from pinpoint to three centimeters in diameter. This alternating and irregular interbedding of bedrock strata is indicative of variations in depositional environments over relatively short periods of time. The first 0 to 15 feet of bedrock encountered varied from highly to slightly weathered and moderately fractured with occasional iron oxide staining along fractures. Beyond 15 to 30 feet, bedrock graded to more competent rock becoming massive. Weathering graded to slight or none, and fractures diminished except for a few vertical or


horizontal water-bearing fractures. The depth to bedrock ranged from 21 feet bgs in SB54A to 36 feet in SB49B. As evidenced by these borings, bedrock surface beneath the site slopes to the southeast with undulations in bedrock topography caused by previous glacial scarring or water erosion. At northern portions of the site, bedrock was relatively shallow at depths of approximately 22 to 24 feet bgs while at the extreme southern portions bedrock was encountered approximately 31 feet bgs with a slight valley separating the portions and with the deepest boring SB49B at 36 feet bgs. 3.3.3 Offsite Geology Soil boring SB68 was advanced near the eastern bank of the Fox River in an area bounded to the north by North Avenue and the railroad tracks to the south and east. The geology of this boring was similar to that of the site, with six inches of topsoil covering fill material composed mainly of clay, sandy gravel and clayey silt with traces of wood fragments, cinders, and coal fragments to a depth of 14 feet bgs. A cohesive layer of silt, three feet thick overlies a granular unit of alternating sandy gravel, silty sand, and sand to 45 feet bgs followed by a cohesive unit of silty clay, 2.5 feet thick. Bedrock was encountered beneath the cohesive unit at 48 feet bgs. 3.3.4 Regional Hydrogeology The geology of the city of Aurora and Kane County, Illinois consists of unconsolidated glacial and alluvial deposits over bedrock of Devonian, Silurian, Ordovician and Cambrian age. Four major aquifers or waterbearing units are present: (1) glacial and alluvial sand and gravel waterbearing deposits; (2) shallow Silurian dolomite aquifer; (3) Cambrian-Ordovician aquifer; and (4) Cambrian Elmhurst-Mt. Simon aquifer. The glacial and alluvial sand and gravel deposits and the Silurian dolomite together make up the geohydrologic system referred to as the shallow Silurian dolomite aquifer present throughout northeastern Illinois (Woller and Sanderson 1978). These units are encountered near the land surface in Aurora, specifically in the Fox River valley, and together range in thickness from 60 to over 150 feet (Woller and Sanderson 1978). The water yield capability of Silurian rocks depends primarily upon the number, size and degree of interconnection of water-filled cracks and fractures within the rock that are penetrated by a well bore (Woller and Sanderson 1978). Also, because Silurian rocks directly underlie permeable deposits of waterbearing sands and gravels, the formation of solution cracks and crevices and free exchange of water from sands and gravels to the bedrock is maximized; thereby, enhancing the yield capability of the Silurian aquifer (Woller and Sanderson 1978). The two shallow aquifers (sand and gravel and Silurian dolomite) are connected hydrologically and recharge by precipitation (Willman 1971). The Silurian dolomite aquifer was investigated during the SSI. The Maquoketa Group, generally consisting of shale, underlies the shallow Silurian dolomite aquifer. It is encounterd at a depth of 50 to 250 feet bgs within Kane County with a thickness of 150 to 200 feet. Generally, the Maquoketa Group is not considered as a source for large municipal water supplies, but as an aquitard (Woller and Sanderson 1978). However, adequate local supplies for small subdivisions and domestic use are obtained from systems of cracks and crevices in the more dolomitic parts of the group.


The Maquoketa Group overlies the confined Cambrian-Ordovician aquifer system, including the Galena and Platteville Dolomite Groups, Glenwood-St. Peter Sandstone, Eminence-Potosi Dolomite, Franconia Formation and the Ironton-Galesville Sandstone. Below the Cambrian-Ordovician aquifer system lies the Eau Claire Formation, primarily a non-waterbearing sandy dolomitic shale that separates the Cambrian-Ordovician aquifer system from deeper waterbearing units. The Elmhurst Sandstone and the Mt. Simon Sandstone (Elmhurst-Mt. Simon aquifer) lie at the base of the Eau Claire Formation. They are interconnected and form the Elmhurst-Mt. Simon aquifer (Woller and Sanderson 1978). 3.3.5 Site Hydrogeology A total of 12 newly constructed monitoring wells were installed during the SSI activities. These wells, in addition to the existing 15 wells located throughout the site, were installed to monitor groundwater conditions at the site in both the upper and lower water bearing units. Shallow monitoring wells (SMW10 through SMW15) were installed and screened within the granular unit, which occurs generally 10 to 22 feet bgs, to monitor the upper water-bearing unit. Deep monitoring wells (DMW10 through DMW14 and DMW05) were installed and screened within the lower water-bearing bedrock unit. Appendix G presents monitoring well construction details. Table 6 presents groundwater elevations measured in the previous and newly installed monitoring wells. Field slug tests were performed in all newly constructed monitoring wells to calculate hydraulic conductivity. The hydraulic conductivity for the site monitoring wells screened in the upper water-bearing unit ranged from 3.133 x 10-4 cm/sec in SMW14 to 8.617 x 10-3 cm/sec in SMW12. The hydraulic conductivity for the site monitoring wells screened in the lower water-bearing bedrock aquifer ranged from 3.406 x 10-5 cm/sec in DMW13 to 5.146 x 10-4 cm/sec in DMW11. All bedrock hydraulic conductivities lie within range of typical hydraulic conductivities for dolomite aquifers (Freeze and Cherry 1979). Detailed explanations and descriptions of the slug test results are included in Appendix H. Table 7 presents the hydraulic conductivity results for all slug tests performed on both deep and shallow monitoring wells during previous and current site investigations. Groundwater elevation measurements collected from the shallow water-bearing unit indicate that site groundwater conditions flow east directly toward the Fox River. Groundwater elevation measurements indicated groundwater flow within the bedrock waterbearing unit beneath the facility is generally to the southeast toward the Fox River. Figures 11 and 12 present the groundwater contour maps for the shallow water-bearing unit and bedrock aquifer unit, respectively. 3.3.6 Offsite Hydrogeology Laboratory hydraulic conductivity tests were conducted in the silty sand unit from 26-32 feet bgs. Hydraulic conductivities ranged from 3.3 x 10-8 cm/sec to 2.0 x 10-6 cm/sec. Appendix I presents laboratory test reports for each test sample interval.


3.4 DEMOGRAPHICS AND LAND USE The city of Aurora is located in Kane County, Illinois. In 2000, the population of Kane County was 404,119. The city of Aurora has a population of 142,990 within its city limits. Population density of Kane County was determined to be 777.2 people per square mile (U.S. Department of Commerce 2000b). The Aurora MGP site is in a mixed commercial/residential area. Properties northeast of the site consist of a small park, home exterior shop and other small light industrial shops. West of the site is a car wash facility and an empty lot with several residential homes on the western border. A large hill that had been located in the center of the empty lot that appeared to be made up of soil and miscellaneous trash (tires, glass, appliances, etc.) has been removed from the area to an unknown location. West of the homes are a fast food restaurant and gas station. To the southwest are several more residential homes, a couple of small shops and a large dry cleaning facility. Bordering the site to the east is the Fox River, with the east channel of the river separating the Hurds Island portion of the site from an area of residences and small businesses located on the east bank of the river.

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4.0 FIELD OBSERVATIONS AND ANALYTICAL RESULTS

This section provides a summary of field observations and analytical results from surface soil, subsurface soil, and groundwater samples collected during this SSI. In general, soil and groundwater samples were analyzed for the following parameters:

• BTEX and styrene. • Phenols. • PAHs. • Metals (with select groundwater samples filtered prior to sampling). • Total cyanide (and amenable cyanide if total cyanide was detected).

In addition, the following miscellaneous chemical analyses were performed on visually impacted or suspected impacted soil.

• SPLP metals. • SPLP cyanide. • TCL VOCs. • TCL SVOCs.

The following miscellaneous analyses were performed on groundwater samples.

• Alkalinity. • Sulfate. • Chloride. • Ferric iron, ferrous iron, total iron and magnesium (with select samples filtered prior to

sampling). • Nitrate and Nitrite.

Test America, Inc. performed the analyses on the soil samples from the investigation, and Severn Trent Laboratories, Inc. performed the analyses on the groundwater samples from the investigation (including both the May 2001 and January 2002 groundwater sampling events). The data were reduced and validated in accordance with the Illinois SRP guidelines. Tables 8 through 14 present summary tables of soil and groundwater analytical results. The Supplemental Site Investigation Sampling Data Book (BMcD 2002) for the Aurora MGP site presents complete laboratory analytical data sheets and data validation memoranda for all samples collected during the SSI. Three Shelby tube soil samples were collected at an offsite soil boring (SB68) advanced east of the East Facility, south of North Avenue and east of the Fox River. Geophysical analytical tests were performed on these soil samples by Materials Testing Consultants, Inc. of Grand Rapids, Michigan. Table 15 presents the geophysical analytical results, and Appendix I contains laboratory data sheets and gradation curves.


4.1 FIELD OBSERVATIONS Soil encountered near the middle of the eastern property boundary of the East Facility contained visually bluish-green impacted soil to depths of approximately eight feet bgs. The soil borings advanced to identify visually impacted soil in this area included SB56, SB57, SB59 through SB62, SB64 through SB67, and hand auger soil samples HA05 and HA06. Coal tar staining was noted on the soil samples collected in soil boring SB63 (located at the northeast corner of the East Facility near the former tar separator) from 18 feet bgs to bedrock. Light non-aqueous phase liquid (LNAPL) was observed in the shallow monitoring well that was later installed at this location (SMW15). The LNAPL was measured to be approximately 1.07 feet in thickness. A petroleum odor was detected while performing the soil boring at the northwest corner of the East Facility (SB54A) from approximately 3 to 20.5 feet bgs. No sheen was noted on the groundwater during the development of the associated well that was later installed at this location (DMW05); however, a petroleum odor was detected. During soil boring activities on the southwest corner of the Storeroom Facility portion (vicinity of former underground storage tanks), a petroleum odor was detected in boreholes SB50A and SB50B and in the associated soil cuttings. No soil staining was noted in the soil cuttings generated from these borings. In addition, no odors or sheens were noted during the development of monitoring wells at these locations. During the development of DMW11, located near the middle of the west property boundary of the West Facility, a strong petroleum odor was detected, and a sheen was present. Otherwise, the soils encountered elsewhere on the East Facility, West Facility and Storeroom Facility of the site during the SSI were visually clean and contain no odors. Similarly, no odors were detected during drilling activities at the offsite soil boring location (SB68), and soils were not observed to be visually impacted. 4.2 SURFACE SOIL RESULTS This section presents the results of 20 surface soil samples that were collected for chemical analysis during this SSI. All of the surface soil samples collected during the investigation were taken from onsite locations. The samples were collected at varying depths from 0 to 4 feet bgs. Most surface soil samples consisted of fill material in areas covered by pavement. Two surface soil samples were covered by grass and topsoil, and the two hand auger surface soil samples were covered by gravel. Table 8 presents a summary of the SSI surface soil analytical results, and Figure 5 presents the surface soil sample locations. 4.2.1 Surface Soil BTEX and Styrene Results BTEX compounds and styrene were detected in one out of the 10 surface soil samples analyzed. The surface soil sample was collected at a depth of 2 to 4 feet bgs in SB57, near the middle of the eastern property


boundary of the East Facility. The individual BTEX and styrene concentrations detected were 0.013 mg/kg for benzene, 0.021 mg/kg for toluene and 0.065 mg/kg for styrene.

4.2.2 Surface Soil Phenol Results Ten surface soil samples were submitted for analysis of phenols. None of the samples contained detectable concentrations of phenols.

4.2.3 Surface Soil PAH Results PAHs were detected in 9 of 10 surface soil samples submitted for analysis. Detected concentrations ranged from 0.06 mg/kg for benzo(b)fluoranthene in SB54A to 1,320 mg/kg for naphthalene in SB56. The highest PAH concentrations were present in soil borings SB56 (2 to 4 feet bgs) and SB57 (2 to 4 feet bgs), which are both located near the middle of the eastern property boundary of the East Facility. High PAH concentrations were also found in SB49A (0-2 feet bgs) located just north of the warehouse on the Storeroom Facility near the eastern property boundary.

4.2.4 Surface Soil Metals and Cyanide Results Several metals were detected in the 12 surface soil samples submitted for analysis. In general, the highest concentrations were detected in samples collected on the Storeroom Facility (SB49A, SB50A and SB51A) and near the northwest corner of the East Facility (SB54A). Detected concentrations ranged from 0.060 mg/kg for mercury in SB58A to 840 mg/kg for lead in SB47B. Silver was non-detect in all 12 surface soil samples. Cyanide was detected in four of the 20 surface soil samples submitted for cyanide analysis. The majority of the cyanide samples were collected near the middle of the eastern property boundary of the East Facility where bluish soil staining was observed. The detected concentrations ranged from 0.38 mg/kg in SB47B which is located near the middle of the eastern property boundary of the West Facility to 809 mg/kg in SB56 (2 to 4 feet bgs) which is located on the East Facility where bluish soil staining was observed. Two of the four surface soil samples with total cyanide detected were also analyzed for amenable cyanide. Soil samples SB47B and SB49A were found to contain 0.38 mg/kg and 1.71 mg/kg amenable cyanide, respectively. 4.2.5 Other Surface Soil Analytical Results Two surface soil samples were collected in the interval from 2 to 4 feet bgs near the middle of the eastern property boundary of the East Facility in the vicinity of a previous sample location (SB15) that was suspected of being potential source material in the 1998 B&V Site Investigation Report. These samples were analyzed for potential source material parameters including TCL VOCs and TCL SVOCs. Table 9 presents the analytical results. TCL VOCs were not detected in SB56, but were detected in SB57 at concentrations ranging from 0.013 mg/kg for benzene to 0.100 mg/kg for bromoform. TCL SVOCs were detected in both of these


subsurface soil samples and concentrations ranged from 7.73 mg/kg for dibenzo(a,h)-anthracene in SB57 to 1,320 mg/kg for naphthalene in SB56. In addition, two surface soil samples collected on the East Facility, and one surface soil sample collected on each of the West Facility and Storeroom Facility were analyzed for SPLP metals and SPLP cyanide. The sample collected from the West Facility (SB52-001) was non-detect. The samples collected from the Storeroom Facility and East Facility contained detected concentrations ranging from 0.00029 mg/l of mercury in SB55 to 0.085 mg/l of barium also in SB55. Table 10 presents these results.

4.3 SUBSURFACE SOIL RESULTS This section presents the results of 12 subsurface soil samples that were collected for chemical analysis during the SSI. All subsurface soil samples collected were obtained from onsite locations. The samples were collected at varying depths from 0 to 18 feet bgs. Table 11 presents a summary of the SSI subsurface soil analytical results, and Figure 5 presents the subsurface soil sample locations.

4.3.1 Subsurface Soil BTEX and Styrene Results BTEX and styrene were not detected in the eight subsurface soil samples analyzed. 4.3.2 Subsurface Soil Phenol Results Phenolic compounds were not detected in the eight subsurface soil samples analyzed. 4.3.3 Subsurface Soil PAH Results PAHs were detected in 7 of the 8 subsurface soil samples analyzed, but at relatively low concentrations. The detected PAH compounds detected in the subsurface soil samples ranged from 0.042 mg/kg of benzo(a)pyrene in SB54A to 3.7 mg/kg of fluoranthene in SB49A. 4.3.4 Subsurface Soil Metals and Cyanide Results Arsenic, barium, chromium and lead were detected in all 14 subsurface soil samples submitted for metals analysis. Detected concentrations of metals ranged from 0.060 mg/kg for mercury in SB50A to 140 mg/kg for barium also in SB50A. Overall, the highest metals concentrations were detected in SB50A (4 to 6 feet bgs) which is located near the southwest corner of the Storeroom Facility (near the location of the former USTs). Cyanide was detected in one of the 12 subsurface soil samples at 1.13 mg/kg in SB49A (10 to 12 feet bgs) located north of the warehouse near the eastern Storeroom Facility property boundary.

4.3.5 Other Subsurface Soil Analytical Results One subsurface soil sample collected on each of the West Facility and Storeroom Facility, and two subsurface soil samples collected on the East Facility were analyzed for SPLP metals and SPLP cyanide. The results of the samples collected from the West Facility and Storeroom Facility were non-detect. For


the East Facility soil samples, SPLP mercury was detected in SB63 at 0.00040 mg/l, and SPLP barium was detected in SB58B at 0.030 mg/l. Table 10 presents these results. 4.4 GROUNDWATER INVESTIGATION RESULTS This section presents the results of the groundwater samples collected from monitoring wells installed during the 1995-1996 SI along with the wells installed during this SSI. The first group of wells were sampled by BMcD in May 2001. These wells along with the wells installed during the SSI activities were sampled in January 2002. Groundwater samples were not collected from monitoring wells with DNAPL impacts. These wells include DMW06, DMW07 and DMW08, which are located on Hurds Island North, for both sampling events. Tables 12 and 13 present summaries of the groundwater analytical results from the May 2001 and January 2002 sampling events, respectively. Figure 6 presents the well locations. The sample results between the two rounds are generally unchanged. Slight increases in BTEX and styrene concentrations were noted in the January 2002 results for DMW01, SMW09 and DMW09. 4.4.1 Groundwater BTEX and Styrene Results The suspected LNAPL sample collected on January 22, 2002 from SMW15 (at the northeast corner of the East Facility) contained elevated concentrations of BTEX. The corresponding water sample collected immediately below the LNAPL sample contained significantly lower concentrations of BTEX (2.2 mg/l benzene compared to 340 mg/l benzene). Styrene was non-detect in both of these samples. In general, the BTEX and styrene results were similar between the May 2001 and January 2002 sampling events. Excluding the results from SMW15, BTEX concentrations ranged from 0.0007 mg/l benzene (SMW05 in January 2002) to 7.2 mg/l of benzene in DMW09 (January 2002). Styrene was only detected in DMW01 (0.023 mg/l) during the May 2001 sampling event and in DMW01 (0.13 mg/l) and DMW11 (0.040 mg/l) during the January 2002 sampling event. 4.4.2 Groundwater Phenol Results The groundwater samples collected during the May 2001 sampling event had no detectable concentrations of phenols. Phenolic compounds were detected at low concentrations during the January 2002 sampling event and ranged from 0.0006 mg/l of 2-methylphenol in DMW01 to 0.016 mg/l of phenol in DMW09. The phenolic compound concentrations in SMW15 were the highest (LNAPL sample), ranging from 0.023 mg/l for 2-methylphenol to 0.037 mg/l for phenol. 4.4.3 Groundwater PAH Results During the May 2001 groundwater sampling event, several PAHs were detected in the groundwater samples collected from SMW09, DMW01 and DMW09. PAH concentrations in these wells ranged from 0.000068 mg/l for benzo(k)fluoranthene in SMW09 to 0.92 mg/l of naphthalene in DMW01.


During the January 2002 groundwater sampling event, PAHs were detected at relatively low concentrations in the groundwater samples collected from five shallow and six deep monitoring wells. Excluding SMW15, PAH concentrations detected in the wells ranged from 0.0002 mg/l of benzo(b)fluoranthene (SMW12) and 0.0002 mg/l of benzo(a)pyrene (DMW03) to 3.7 mg/l of naphthalene (DMW11). The PAHs detected in the LNAPL sample and groundwater sample beneath from SMW15 were at higher concentrations. The LNAPL PAH concentrations ranged from 0.13 mg/l for dibenzo(a,h)anthracene to 32 mg/l for naphthalene. The groundwater PAH concentrations beneath the LNAPL sample ranged from 1.1 mg/l for dibenzo(a,h)anthracene to 220 mg/l for naphthalene. 4.4.4 Groundwater Metals and Cyanide Results In general, detected metal concentrations decreased during the January 2002 groundwater sampling event compared to the May 2001 groundwater sampling event. Metal concentrations ranged from 0.0051 mg/l of selenium (SMW05 in May 2001) to 3.82 mg/l of chromium (SMW03 in May 2001). Detected cyanide concentrations between the sampling events ranged from 0.0102 mg/l (DMW03 in January 2002) to 0.393 mg/l (SMW15 in January 2002, below the LNAPL sample). 4.4.5 Other Groundwater Analytical Results During the January 2002 groundwater sampling event, the groundwater samples from each of the wells sampled were also analyzed for various combinations of alkalinity, sulfate, chloride, ferric iron, ferrous iron, nitrite/nitrate, iron and magnesium. Select groundwater samples were also field filtered during sampling for metals and cyanide. These results will be used to assist in preparing a groundwater model for the site. Table 14 presents the summary of these additional groundwater analytical results.

* * * * *


5.0 CONCLUSIONS The overall objective of the Aurora MGP SSI was to collect sufficient data to evaluate whether offsite impacts are migrating onsite, in addition to further defining the extent of MGP impacts to soil, groundwater and bedrock. Data will be used to aid in the development of remediation objectives, if necessary, and a groundwater transport model. The objective was achieved by conducting soil borings and bedrock corings, installing monitoring wells and collecting soil and groundwater samples. 5.1 SUFFICIENCY OF DATA The overall objectives of this SSI were met and the extent of MGP impacts has been defined. 5.2 RECOMMENDATIONS FOR FURTHER INVESTIGATION Based on the results of previous investigations, further investigation on the West Facility and Storeroom Facility is recommended to aid in the development of remedial alternatives. A complete evaluation of all existing data in accordance with Illinois Tiered Approach to Corrective Action Objectives (TACO) requirements will be prepared in forthcoming reports.

* * * * *


6.0 REFERENCES Aurora Beacon-News, 1946. Gas Industry Started Here 78 Years Ago, September 15. Berg, Richard C. and Kempton, John P., 1988. Stack-Unit Mapping of Geologic Materials in Illinois.

State of Illinois. Illinois Department of Energy and Natural Resources, Illinois State Geological Survey.

Berg, Richard C., Kempton, John P., and Cartwright, Keros, 1984. Potential for Contamination of

Shallow Aquifers from Land Burial of Municipal Wastes. State of Illinois. Illinois Department of Energy and Natural Resources, Illinois Geological Survey.

Bergstrom, R.E. et.al., 1955. Groundwater Possibilities in Northeastern Illinois, Illinois State Geological

Survey, Circular 198. Burns & McDonnell Engineering Company, Inc. (BMcD), 1999. Structure Area Interim Remedial Action

Plan for the Nicor Gas Aurora Manufactured Gas Plant Site in Aurora, Illinois, December. BMcD, 2000. Supplemental Site Investigation Work Plan for the Nicor Gas Aurora Manufactured Gas

Plant Site in Aurora, Illinois, April. BMcD, 2001a. Draft Structure Area Interim Remedial Action Completion Report for the Nicor Gas

Aurora Manufactured Gas Plant Site in Aurora, Illinois, August. BMcD, 2001b. Interim Remedial Action Sampling Data (Vol. 1 and 2) for the Nicor Gas Aurora Manufactured Gas Plant Site in Aurora, Illinois, August. BMcD, 2002. Supplemental Site Investigation Sampling Data for the Nicor Gas Aurora Manufactured Gas Plant Site in Aurora, Illinois, April. Black & Veatch Waste Science, Inc. (BVWS), 1994. Fox River Sampling Event I Report prepared for

Northern Illinois Gas Company, July. BVWS, 1995a. Fox River Sampling Event II Report prepared for Northern Illinois Gas Company, June. BVWS, 1995b. Ecological Risk Screening Assessment prepared for Northern Illinois Gas Company,

September. BVWS, 1996. Remedial Investigation Sampling Data (Vol. 1 and 2) prepared for Northern Illinois Gas

Company, April.


BVWS, 1997. Hurds Island Soccer Field Surface Soil Investigation Report prepared for Northern Illinois Gas Company, July.

Black & Veatch (B&V), 1998a. Site Investigation Report prepared for Nicor Gas, September. B&V, 1998b. Hurds Island Site Investigation Sampling Data prepared for Nicor Gas, November. B&V, 1998c. Hurds Island Site Investigation Report prepared for Nicor Gas, November. B&V, 1999a. Storeroom Facility Site Investigation Sampling Data prepared for Nicor Gas, August. B&V, 1999b. Storeroom Facility Site Investigation Report prepared for Nicor Gas, October. B&V, 1999c. Illinois EPA Leaking Underground Storage Tank Program 45 Day Report for the Aurora

MGP site, Storeroom Facility, November. B&V, 2000. Hurds Island Remediation Objectives Report prepared for Nicor Gas (originally prepared in

November 1998), April. Freeze, A., and J. Cherry, 1979. Groundwater, Prentice Hall Inc., Englewood Cliffs, N.J. Home Insurance Company, 1926. Map of Nicor Gas Aurora facility. Lineback, Jerry, 1979. Quaternary Deposits of Illinois. State of Illinois. Institute of Natural Resources.

Illinois State Geological Survey. Microgeophysics Corporation (MGC), 1997. Seismic Refraction Survey of the Nicor Gas Aurora MGP

facility, prepared for B&V, September. Midwest Climatic Data Center (MCDC), 2002. Meteorological Data for Aurora College Site #110338.

Internet address http://mcc.sws.edu/summary/data/110338.txt. Sanborn Map and Publishing Company, 1897. Sanborn Fire Insurance Map of Aurora, Illinois. Sanborn Map and Publishing Company, 1907. Sanborn Fire Insurance Map of Aurora, Illinois. Sanborn Map and Publishing Company, 1926. Sanborn Fire Insurance Map of Aurora, Illinois. Sanborn Map and Publishing Company, 1941. Sanborn Fire Insurance Map of Aurora, Illinois. Sanborn Map and Publishing Company, 1950. Sanborn Fire Insurance Map of Aurora, Illinois


Sidwell Map, 1985. Aerial photograph of the Nicor Gas Aurora MGP facility. United States Department of Commerce, National Oceanic and Atmospheric Administration (NOAA),

2000a. Climatology information obtained from NOAA web page, July. United States Department of Commerce, Economics and Statistics Administration, Bureau of the Census,

2000b. Information Population and Housing Characteristics for Illinois obtained from US Census Bureau web page, October.

United States Environmental Protection Agency (USEPA), 1985. Survey of Town Gas and By-Product

Production and Locations in the United States, EPA/600/2-88/012, February. United States Geological Survey (USGS), 1972. Aurora North topographic map, 7.5 minute quadrangle. USGS, 1980. Aurora South topographic map, 7.5 minute quadrangle. USGS, 1991. Water Resources Data for Illinois, Volume 2. Illinois River Basin, Water Year 1991. USGS, 2000. Information obtained from USGS web page, July. Willman, H.B., 1967. Geologic Map of Illinois. State of Illinois. Department of Registration and

Education. Willman, G.B., 1971. Summary of the Geology of the Chicago Area, Illinois State Geological Survey

Circular 460, Urbana, Illinois. Willman, H.B., Atherton, E., Buschbach, T.C., Collinson, C., Frye, J.C., Hopkins, M.E., Lineback, J.A.,

and Simon, J.A., 1975. Handbook of Illinois Stratigraphy. State of Illinois. Department of Registration and Education.

Woller, Dorothy M. and Ellis W. Sanderson, 1978. Public Groundwater Supplies in Kane County,

Illinois State Water Survey, Bulletin 60-22.

* * * * *

TABLES SUPPLEMENTAL SITE INVESTIGATION

AURORA MGP SITE

Aurora MGP Site 1 of 2 SSI Report

Table 1

Surface Soil Sample Analysis Aurora MGP Site

Sample Number

Sample Depth (feet below

ground surface)

Sample

Description

Analysis

SB47B-001 0-2 Fill Benzene, toluene, ethylbenzene, total xylenes (BTEX), styrene, phenols, polynuclear aromatic hydrocarbons (PAHs), Resource Conservation and Recovery Act (RCRA) metals, total cyanide, amenable cyanide, pH and total organic carbon (TOC).

SB48A-001 0-2 Fill BTEX, styrene, phenols, PAHs, RCRA metals and total cyanide.

SB49A-001 0-2 Fill BTEX, styrene, phenols, PAHs, RCRA metals, total cyanide, amenable cyanide, pH and TOC.


SB51A-001 0-2 Fill BTEX, styrene, phenols, PAHs, RCRA metals, total cyanide, pH and TOC.

SB52-001 1-3 Fill RCRA metals, total cyanide, synthetic precipitation leaching procedure (SPLP) RCRA metals, SPLP cyanide, pH and TOC.

SB53-001 1-3 Fill RCRA metals, total cyanide, SPLP RCRA metals, SPLP cyanide, pH and TOC.

SB54A-001 0-2 Fill BTEX, styrene, phenols, PAHs, RCRA metals, total cyanide, pH and TOC.


SB55-001 1-3 Fill RCRA metals, total cyanide, SPLP RCRA metals, SPLP cyanide, pH and TOC.

SB56-001 2-4 Fill Target compound list (TCL) volatile organic compounds (VOCs), TCL semivolatile organic compounds (SVOCs), total cyanide, reactive sulfide, reactive cyanide and pH.


Table 1 (Continued) Surface Soil Sample Analysis

Aurora MGP Site

Sample Number

Sample Depth (feet below

ground surface)

Sample

Description

Analysis

SB57-001 2-4 Fill TCL VOCs, TCL SVOCs, total cyanide, reactive sulfide, reactive cyanide and pH.

SB58A-001 2-4 Fill RCRA metals, total cyanide, SPLP RCRA metals, SPLP cyanide and pH.

SB64-001 1-3 Fill Total cyanide.




SS63-001 0-0.5 Topsoil BTEX, styrene, phenols, PAHs, RCRA metals and total cyanide.

HA05-001 2-4 Fill Total cyanide.

HA06-001 2-4 Fill Total cyanide.


Table 2

Subsurface Soil Sample Analysis Aurora MGP Site

Sample Number

Sample Depth (feet below ground

surface)

Sample

Description

Analysis

SB47B-002 6-8 Clay & silty gravel

Benzene, toluene, ethylbenzene, total xylenes (BTEX), styrene, phenols, polynuclear aromatic hydrocarbons (PAHs), Resource Conservation and Recovery Act (RCRA) metals, total cyanide, pH and total organic carbon (TOC).

SB48A-002 8-10 Silty gravel BTEX, styrene, phenols, PAHs, RCRA metals and total cyanide.

SB49A-002 10-12 Silty gravel BTEX, styrene, phenols, PAHs, RCRA metals, total cyanide, pH and TOC.

SB50A-002 4-6 Clay and silty gravel

BTEX, styrene, phenols, PAHs, RCRA metals and total cyanide.

SB50A-003 8-10 Clay BTEX, styrene, phenols, PAHs, RCRA metals and total cyanide.

SB51A-002 8-10 Silty gravel BTEX, styrene, phenols, PAHs, RCRA metals, total cyanide, pH and TOC.

SB52-002 8-10 Silty gravel RCRA metals, total cyanide, synthetic precipitation leaching procedure (SPLP) RCRA metals, SPLP cyanide, pH and TOC.

SB53-002 8-10 Silty gravel RCRA metals, total cyanide, SPLP RCRA metals, SPLP cyanide, pH and TOC.

SB54A-003 10-12 Silty gravel BTEX, styrene, phenols, PAHs, RCRA metals and total cyanide.

SB54A-004 16-18 Silty gravel & sandy gravel

BTEX, styrene, phenols, PAHs, RCRA metals and total cyanide.

SB55-002 8-10 Silty gravel pH and TOC.


Table 2 (Continued)

Subsurface Soil Sample Analysis Aurora MGP Site

Sample Number

Sample Depth (feet below ground

surface)

Sample

Description

Analysis

SB58B-001 8-10 Silty gravel RCRA metals, total cyanide, SPLP RCRA metals, SPLP cyanide, pH and TOC.

SB63-001 12-14 Fill RCRA metals, total cyanide, SPLP RCRA metals, SPLP cyanide and pH.

SB68-001 26-28 Silty sand Hydraulic conductivity, specific gravity, moisture content, dry unit weight and grain size distribution.




Table 3

Bedrock Boring Descriptions Aurora MGP Site

Boring Number

Depth Range within Bedrock (feet below ground surface)

Description

SB47A 27 to 56 Dolomite

SB48C 26 to 56 Dolomite

SB49B 36 to 55.5 Dolomite

SB50A 34.5 to 56 Dolomite

SB51A 31 to 55.5 Dolomite

SB54A 21 to 56.5 Dolomite


Table 4

Groundwater Monitoring Well Screen Information Aurora MGP Site

Monitoring Well Location/

Boring Number

Screen Depth (feet bgs)

Description of Major Screened

Unit

Screen Description

SMW01/ SB01b

17 to 21 Silty gravel Four-foot stainless steel, two-inch diameter schedule 5 type 304 with 0.010 inch slots.

SMW02/ SB27b

19 to 23 Sand and gravel Four-foot stainless steel, two-inch diameter schedule 5 type 304 with 0.010 inch slots.

SMW03/ SB17b

19 to 23 Silty sand Four-foot stainless steel, two-inch diameter schedule 5 type 304 with 0.010 inch slots.

SMW05/ SB05b

14.5 to 18.5 Silty gravel Four-foot stainless steel, two-inch diameter schedule 5 type 304 with 0.010 inch slots.

SMW06/ SB16b

19 to 23 Silty gravel Four-foot stainless steel, two-inch diameter schedule 5 type 304 with 0.010 inch slots.

SMW07/ SB28b

11 to 15 Sandy gravel Four-foot stainless steel, two-inch diameter schedule 5 type 304 with 0.010 inch slots.

SMW08/ SB29b

11 to 15 Clayey silt and gravelly sand

Four-foot stainless steel, two-inch diameter schedule 5 type 304 with 0.010 inch slots.

SMW09/ SB30b

11 to 15 Sandy gravel and sand

Four-foot stainless steel, two-inch diameter schedule 5 type 304 with 0.010 inch slots.

SMW10*/ SB47B

15 to 20 Sandy gravel Five-foot stainless steel, two-inch diameter schedule 5 type 304 with 0.010 inch slots.

SMW11*/ SB48D

17 to 22 Sandy gravel and silty gravel

Five-foot stainless steel, two-inch diameter schedule 5 type 304 with 0.010 inch slots.

SMW12*/ SB49C

17 to 22 Silty gravel Five-foot stainless steel, two-inch diameter schedule 5 type 304 with 0.010 inch slots.

SMW13*/ SB50B

17 to 22 Sandy gravel Five-foot stainless steel, two-inch diameter schedule 5 type 304 with 0.010 inch slots.

SMW14*/ SB51B

17.5 to 22.5 Sandy gravel and silty clay

Five-foot stainless steel, two-inch diameter schedule 5 type 304 with 0.010 inch slots.

Notes: 1. bgs - below ground surface. 2. * Denotes monitoring well installed by BMcD in 2001. 3. SMW = Shallow monitoring well; and SB = Soil boring.


Table 4 (Continued)

Groundwater Monitoring Well Screen Information Aurora MGP Site

Monitoring Well Number/

Boring Number

Screen Depth (feet bgs)

Description of Major Screened

Unit

Screen Description

SMW15*/

SB63 18.5 to 23.5 Fill and sandy

gravel Five-foot stainless steel, two-inch diameter schedule 5 type 304 with 0.010 inch slots.

DMW01/ SB01a

46 to 55 Dolomite Nine-foot stainless steel, two-inch diameter schedule 5 type 304 with 0.010 inch slots.

DMW02/ SB27a


DMW03/ SB17a

46 to 55 Dolomite and shale Nine-foot stainless steel, two-inch diameter schedule 5 type 304 with 0.010 inch slots.

DMW04/ SB31


DMW05*/ SB54A

44.75 to 54.75 Dolomite Ten-foot stainless steel, two-inch diameter schedule 5 type 304 with 0.010 inch slots.

DMW07*/ SB28


DMW08*/ SB29


DMW09/ SB30b

46.5 to 55.5 Dolomite Nine-foot stainless steel, two-inch diameter schedule 5 type 304 with 0.010 inch slots.

DMW10*/ SB47A


DMW11*/ SB48C


DMW12*/ SB49B


DMW13*/ SB50A

45 to 55 Dolomite Ten-foot stainless steel, two-inch diameter schedule 5 type 304 with 0.010 inch slots.

DMW14*/ SB51A


Notes: 1. bgs - below ground surface 2. * Denotes monitoring well installed by BMcD in 2001. 3. SMW = Shallow monitoring well; DMW = Deep monitoring well; and SB = Soil boring.


Table 5

Groundwater Sample Analysis Aurora MGP Site

Monitoring Well

Number

Analyses

SMW01

Benzene, toluene, ethylbenzene, total xylenes (BTEX), styrene, phenols, polynuclear aromatic hydrocarbons (PAHs), Resource Conservation and Recovery Act (RCRA) metals, total cyanide, alkalinity, sulfate, chloride, ferric iron, ferric iron (dissolved), ferrous iron, ferrous iron (dissolved), nitrate/nitrite, RCRA metals (dissolved), iron, iron (dissolved), magnesium, and magnesium (dissolved).

SMW02 BTEX, styrene, phenols, PAHs, RCRA metals, total cyanide, alkalinity, sulfate, chloride, ferric iron, ferric iron (dissolved), ferrous iron, ferrous iron (dissolved), nitrate/nitrite, RCRA metals (dissolved), iron, iron (dissolved), magnesium, and magnesium (dissolved).




SMW07 BTEX, styrene, phenols, PAHs, RCRA metals, total cyanide, alkalinity, sulfate, chloride, ferric iron, ferrous iron, nitrate/nitrite, iron, and magnesium.



SMW10* BTEX, styrene, phenols, PAHs, RCRA metals, total cyanide, alkalinity, sulfate, chloride, ferric iron, ferrous iron, nitrate/nitrite, iron, and magnesium.


Notes: 1. bgs - below ground surface. 2. * Denotes monitoring well installed by BMcD in 2001. 3. SMW = shallow monitoring well.


Table 5 (Continued)


Monitoring Well

Number

Analyses

SMW12* BTEX, styrene, phenols, PAHs, RCRA metals, total cyanide, alkalinity, sulfate, chloride, ferric iron, ferric iron (dissolved), ferrous iron, ferrous iron (dissolved), nitrate/nitrite, RCRA metals (dissolved), iron, iron (dissolved), magnesium, and magnesium (dissolved).



SMW15* BTEX, styrene, phenols, PAHs, RCRA metals, total cyanide, and magnesium.

DMW01 BTEX, styrene, phenols, PAHs, RCRA metals, total cyanide, alkalinity, sulfate, chloride, ferric iron, ferrous iron, nitrate/nitrite, iron, and magnesium.

DMW02 BTEX, styrene, phenols, PAHs, RCRA metals, total cyanide, alkalinity, sulfate, chloride, ferric iron, ferric iron (dissolved), ferrous iron, ferrous iron (dissolved), nitrate/nitrite, RCRA metals (dissolved), iron, iron (dissolved), magnesium, and magnesium (dissolved).

DMW03 BTEX, styrene, phenols, PAHs, RCRA metals, total cyanide, alkalinity, sulfate, chloride, ferric iron, ferric iron (dissolved), ferrous iron, ferrous iron (dissolved), nitrate/nitrite, RCRA metals (dissolved), iron, iron (dissolved), magnesium, and magnesium (dissolved).


DMW05* BTEX, styrene, phenols, PAHs, RCRA metals, total cyanide, alkalinity, sulfate, chloride, ferric iron, ferrous iron, nitrate/nitrite, iron, and magnesium.




Notes: 1. bgs - below ground surface. 2. * Denotes monitoring well installed by BMcD in 2001. 3. SMW = shallow monitoring well; DMW = deep monitoring well.


Table 5 (Continued)


Monitoring Well

Number

Analyses

DMW12* BTEX, styrene, phenols, PAHs, RCRA metals, total cyanide, alkalinity, sulfate, chloride, ferric iron, ferric iron (dissolved), ferrous iron, ferrous iron (dissolved), nitrate/nitrite, RCRA metals (dissolved), iron, iron (dissolved), magnesium, and magnesium (dissolved).



Notes: 1. bgs - below ground surface. 2. * Denotes monitoring well installed by BMcD in 2001. 3. DMW = deep monitoring well.


Table 6 Groundwater Elevations

Aurora MGP Site

Groundwater Elevation (feet above mean sea level)

Monitoring Well

Geologic Unit Monitored

Top of Casing Elevation

(feet above mean sea level) May 2001 January 2002

SMW01 Silty gravel 640.44 628.44 627.37

SMW02 Sand and gravel 640.40 627.73 626.69

SMW03 Silty sand 637.82 Water below pump 618.87

SMW05 Silty gravel 640.63 626.72 625.39

SMW06 Silty gravel 638.83 622.63 621.31

SMW07 Sandy gravel 624.50 619.50 618.43

SMW08 Clayey silt and gravelly sand

622.36 618.74 617.86

SMW09 Sandy gravel and sand

621.77 618.17 617.21

SMW10* Sandy gravel and silty clay

638.65 --- 626.77

SMW11* Sandy gravel and silty gravel

640.01 --- 628.19

SMW12* Silty gravel 638.28 --- 626.23

SMW13* Sandy gravel 638.71 --- 629.54

SMW14* Sandy gravel and silty clay

638.92 --- 626.23

SMW15* Silty gravel and fill

638.22 --- 617.55

DMW01 Dolomite 640.59 619.69 618.83

DMW02 Dolomite 640.63 626.42 623.31

Notes: 1. * Denotes monitoring well installed by BMcD in 2001. 2. --- Well installed after this sampling event.


Table 6 (Continued)

Groundwater Elevations Aurora MGP Site

Groundwater Elevation (feet above mean sea level)

Monitoring Well

Geologic Unit Monitored

Top of Casing Elevation

(feet above mean sea level) May 2001 January 2002

DMW03 Dolomite and shale

638.20 619.90 619.20

DMW04 Dolomite 642.05 620.65 619.38

DMW05* Dolomite 640.20 --- 619.00

DMW07 Dolomite 624.91 --- 618.40

DMW08 Dolomite 622.37 --- 617.12

DMW09 Dolomite 621.97 618.32 617.41

DMW10* Dolomite 638.67 --- 618.86

DMW11* Dolomite 639.74 --- 618.82

DMW12* Dolomite 637.98 --- 620.92

DMW13* Dolomite 639.12 --- 627.62

DMW14* Dolomite 638.77 --- 625.18

Notes: 1. * Denotes monitoring well installed by BMcD in 2001 2. --- Well installed after this sampling event.

Screen Interval Hydraulic Monitoring Screen Length Screen Depth (Geologic Unit Conductivity

Well (ft) (ft bgs) Description) (cm/s)

SMW01 4 17-21 Granular Unit 2.40E-03



SMW05 4 14.5-18.5 Granular Unit 3.56E-03




SMW-10* 5 15-20 Granular Unit 3.011E-03




SMW-14* 5 17.5-22.5 Granular Unit 3.133E-04

DMW01 9 46-55 Bedrock 1.17E-03

DMW02 9 45-54 Bedrock 1.60E-05

DMW03 9 46-55 Bedrock 1.67E-04

DMW04 9 46-55 Bedrock 3.79E-04

DMW05* 10 44.75-54.75 Bedrock 1.653E-04

DMW07 9 46-55 Bedrock 3.31E-04

DMW09 9 46.5-55.5 Bedrock 3.48E-04

DMW10* 10 44.33-54.33 Bedrock 4.560E-04

DMW11* 10 44.75-54.75 Bedrock 5.146E-04

DMW12* 10 44.1-54.1 Bedrock 2.221E-04

DMW13* 10 45-55 Bedrock 3.406E-05DMW14* 10 44.5-54.5 Bedrock 7.092E-05

Note:1. * Monitoring well installed during 2001 SSI field activities.

Shallow Monitoring Wells (SMW)

Deep Monitoring Wells (DMW)

Table 7Hydraulic Conductivity Results

Aurora MGP Site

Aurora MGP Site Page 1 of 1SSI Report

Table 8Surface Soil Analytical Results

Aurora MGP Site

Sample Location and Depth (feet below ground surface)/ConcentrationSB47B-001 SB48A-001 SB49A-001 SB50A-001 SB51A-001 SB52-001

Compound/Analyte 0-2 0-2 0-2 0-2 0-2 1-3BTEX/Styrene (mg/kg)

Benzene 0.0050 U 0.0050 U 0.0064 U 0.0066 U 0.0062 U NAEthylbenzene 0.0050 U 0.0050 U 0.0064 U 0.0066 U 0.0062 U NAToluene 0.0050 U 0.0050 U 0.0064 U 0.0066 U 0.0062 U NAXylenes (total) 0.0150 U 0.0150 U 0.0191 U 0.0199 U 0.0185 U NAStyrene 0.0050 U 0.0050 U 0.0064 U 0.0066 U 0.0062 U NA

Phenols (mg/kg)2,4-Dimethylphenol 0.250 U 0.250 U 0.320 U 0.330 U 0.308 UJ NA2-Methylphenol 0.250 U 0.250 U 0.320 U 0.330 U 0.308 UJ NA3-,4-Methylphenol 0.250 U 0.250 U 0.320 U 0.330 U 0.308 UJ NAPhenol 0.250 U 0.250 U 0.320 U 0.330 U 0.308 UJ NA

PAHs (mg/kg)Acenaphthene 0.040 0.040 U 0.17 0.053 U 0.049 U NAAcenaphthylene 0.049 0.040 U 2.0 0.053 U 0.049 U NAAnthracene 0.15 0.040 U 7.9 0.09 0.17 NABenzo(a)anthracene 1.5 0.040 U 31 0.50 0.63 NABenzo(b)fluoranthene 1.0 0.040 U 19 J 0.53 0.59 NABenzo(k)fluoranthene 0.96 0.040 U 17 J 0.39 0.55 NABenzo(a)pyrene 1.7 0.040 U 23 0.58 0.75 NABenzo(g,h,i)perylene 0.66 0.040 U 12 0.37 0.52 NAChrysene 1.4 0.040 U 23 0.44 0.64 NADibenzo(a,h)anthracene 0.17 0.040 U 4.2 0.13 0.16 NAFluoranthene 1.7 0.040 U 61 0.69 1.2 NAFluorene 0.040 U 0.040 U 0.65 0.053 U 0.049 U NAIndeno(1,2,3-cd)pyrene 0.79 0.040 U 13 0.31 0.43 NANaphthalene 0.07 0.040 U 1.1 0.053 U 0.049 U NAPhenanthrene 0.63 0.040 U 5.5 0.37 0.49 NAPyrene 1.4 0.040 U 41 0.68 0.86 NADibenzofuran 0.250 U 0.250 U 0.320 U 0.332 U 0.308 U NA2-Methylnaphthalene 0.250 U 0.250 U 0.320 U 0.332 U 0.308 U NA

RCRA Metals and Cyanide (mg/kg)Arsenic 88 7.5 20 23 11 6.7Barium 87 J 22 J 217 J 226 J 296 J 171 JCadmium 2.8 0.50 U 0.64 U 2.0 1.6 0.61 UChromium 14 9.7 29 27 28 24Lead 840 9.9 344 438 234 28Mercury 1.5 J 0.040 U 0.48 J 0.35 J 0.23 J 0.049 USelenium 1.5 U 1.5 U 5.9 2.0 U 1.8 U 1.8 USilver 2.0 U 2.0 U 2.6 U 2.7 U 2.5 U 2.4 UTotal Cyanide 0.38 J 0.25 UJ 7.42 0.33 UJ 0.31 UJ 0.31 UJAmenable Cyanide 0.38 J NA 1.71 NA NA NA

Miscellaneous AnalysespH (unitless) 7.7 J NA 7.1 NA 8.2 6.9 JTOC (percent) 6.7 NA 4.1 NA 5.9 3.6Notes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.3) NA - Not analyzed.


Table 8 (Continued)Surface Soil Analytical Results

Aurora MGP Site

Sample Location and Depth (feet below ground surface)/ConcentrationSB53-001 SB54A-001 SB54A-002 SB55-001 SB56-001 SB57-001


Benzene NA 0.0061 U 0.0065 U NA 6.90 U 0.013Ethylbenzene NA 0.0061 U 0.0065 U NA 6.90 U 0.0088 UToluene NA 0.0061 U 0.0065 U NA 6.90 U 0.021Xylenes (total) NA 0.0184 U 0.0194 U NA 20.7 U 0.0264 UStyrene NA 0.0061 U 0.0065 U NA 6.90 U 0.065

Phenols (mg/kg)2,4-Dimethylphenol NA 1.40 U 0.320 U NA 176 U 4.40 U2-Methylphenol NA 1.40 U 0.320 U NA 176 U 4.40 U3-,4-Methylphenol NA 1.40 U 0.320 U NA 176 U 4.40 UPhenol NA 1.40 U 0.320 U NA 176 U 4.40 U

PAHs (mg/kg)Acenaphthene NA 0.48 U 0.32 NA 176 U 4.40 UAcenaphthylene NA 0.48 U 0.16 NA 176 U 26.4Anthracene NA 0.48 U 0.13 NA 176 U 40.4Benzo(a)anthracene NA 1.0 0.14 NA 176 U 86.1Benzo(b)fluoranthene NA 0.89 0.06 NA 176 U 38.7Benzo(k)fluoranthene NA 0.70 0.052 U NA 176 U 43.9Benzo(a)pyrene NA 1.2 0.09 NA 176 U 29.9Benzo(g,h,i)perylene NA 1.0 0.052 U NA 176 U 22.8Chrysene NA 0.70 0.27 NA 270 J 91.4Dibenzo(a,h)anthracene NA 0.48 U 0.052 U NA 176 U 7.73Fluoranthene NA 1.1 0.1 NA 496 J 193Fluorene NA 0.48 U 0.58 NA 176 U 24.6Indeno(1,2,3-cd)pyrene NA 0.97 0.052 U NA 176 U 22.8Naphthalene NA 0.48 U 0.09 NA 1,320 J 4.40 UPhenanthrene NA 1.1 0.052 U NA 1,040 J 264Pyrene NA 0.97 0.22 NA 709 J 264Dibenzofuran NA 1.40 U 0.530 NA 176 U 4.40 U2-Methylnaphthalene NA 2.08 0.320 U NA 426 J 4.40 U

RCRA Metals and Cyanide (mg/kg)Arsenic 11 17 13 16 NA NABarium 41 J 110 J 181 J 178 J NA NACadmium 1.1 1.2 0.65 U 0.63 U NA NAChromium 16 20 43 30 NA NALead 16 54 22 24 NA NAMercury 0.65 J 0.20 J 0.052 U 0.79 J NA NASelenium 1.8 U 1.8 U 1.9 U 1.9 U NA NASilver 2.4 U 2.4 U 2.6 U 2.5 U NA NATotal Cyanide 0.3 UJ 0.31 UJ 0.32 UJ 0.32 UJ 809 J 0.44 UJAmenable Cyanide NA NA NA NA NA NA

Miscellaneous AnalysespH (unitless) 8.1 8.0 NA 7.4 5.3 1.6TOC (percent) 7.7 21.4 NA 3.6 NA NANotes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.3) NA - Not analyzed.



Aurora MGP Site

Sample Location and Depth (feet below ground surface)/ConcentrationSB58A-001 SB64-001 SB65-001 SB66-001 SB67-001 SS63-001

Compound/Analyte 2-4 1-3 2-4 2-4 2-4 0-0.5BTEX/Styrene (mg/kg)

Benzene NA NA NA NA NA 0.0061 UEthylbenzene NA NA NA NA NA 0.0061 UToluene NA NA NA NA NA 0.0061 UXylenes (total) NA NA NA NA NA 0.0182 UStyrene NA NA NA NA NA 0.0061 U

Phenols (mg/kg)2,4-Dimethylphenol NA NA NA NA NA 3.00 U2-Methylphenol NA NA NA NA NA 3.00 U3-,4-Methylphenol NA NA NA NA NA 3.00 UPhenol NA NA NA NA NA 3.00 U

PAHs (mg/kg)Acenaphthene NA NA NA NA NA 0.46 UAcenaphthylene NA NA NA NA NA 0.46 UAnthracene NA NA NA NA NA 0.57Benzo(a)anthracene NA NA NA NA NA 2.02Benzo(b)fluoranthene NA NA NA NA NA 2.00Benzo(k)fluoranthene NA NA NA NA NA 1.39Benzo(a)pyrene NA NA NA NA NA 2.05Benzo(g,h,i)perylene NA NA NA NA NA 1.32Chrysene NA NA NA NA NA 1.73Dibenzo(a,h)anthracene NA NA NA NA NA 0.56Fluoranthene NA NA NA NA NA 3.73Fluorene NA NA NA NA NA 0.46 UIndeno(1,2,3-cd)pyrene NA NA NA NA NA 1.2Naphthalene NA NA NA NA NA 0.46 UPhenanthrene NA NA NA NA NA 1.90Pyrene NA NA NA NA NA 2.78Dibenzofuran NA NA NA NA NA 3.00 U2-Methylnaphthalene NA NA NA NA NA 3.00 U

RCRA Metals and Cyanide (mg/kg)Arsenic 21 NA NA NA NA 13Barium 100 J NA NA NA NA 170 JCadmium 0.59 NA NA NA NA 1.3Chromium 23 NA NA NA NA 22Lead 28 NA NA NA NA 243Mercury 0.060 J NA NA NA NA 0.74 JSelenium 1.7 U NA NA NA NA 1.8 USilver 2.3 U NA NA NA NA 2.4 UTotal Cyanide 0.29 UJ 0.35 U 0.30 U 0.31 U 0.29 U 0.30 UJAmenable Cyanide NA NA NA NA NA NA

pH (unitless) 7.0 NA NA NA NA NATOC (percent) NA NA NA NA NA NANotes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.3) NA - Not analyzed.

Miscellaneous Analyses



Aurora MGP Site

Sample Location and Depth (feet below ground surface)/ConcentrationHA05-001 HA06-001

Compound/Analyte 2-4 2-4

Benzene NA NAEthylbenzene NA NAToluene NA NAXylenes (total) NA NAStyrene NA NA

Phenols (mg/kg)2,4-Dimethylphenol NA NA2-Methylphenol NA NA3-,4-Methylphenol NA NAPhenol NA NA

Acenaphthene NA NAAcenaphthylene NA NAAnthracene NA NABenzo(a)anthracene NA NABenzo(b)fluoranthene NA NABenzo(k)fluoranthene NA NABenzo(a)pyrene NA NABenzo(g,h,i)perylene NA NAChrysene NA NADibenzo(a,h)anthracene NA NAFluoranthene NA NAFluorene NA NAIndeno(1,2,3-cd)pyrene NA NANaphthalene NA NAPhenanthrene NA NAPyrene NA NADibenzofuran NA NA2-Methylnaphthalene NA NA

Arsenic NA NABarium NA NACadmium NA NAChromium NA NALead NA NAMercury NA NASelenium NA NASilver NA NATotal Cyanide 0.27 U 1.21Amenable Cyanide NA NA

pH (unitless) NA NATOC (percent) NA NANotes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) NA - Not analyzed.

RCRA Metals and Cyanide (mg/kg)


BTEX/Styrene (mg/kg)

PAHs (mg/kg)


Table 9Potential Source Material Analytical Results

Aurora MGP Site

Sample Location and Depth (feet below ground surface)/ConcentrationSB56-001 SB57-001

2-4 2-4TCL VOCs (mg/kg)

Acetone 138 U 0.176 UBenzene 6.90 U 0.013Bromodichloromethane 6.90 U 0.0088 UBromoform 6.90 U 0.100Bromomethane 14.0 U 0.018 UCarbon disulfide 138 U 0.176 UCarbon tetrachloride 6.90 U 0.0088 UChlorobenzene 6.90 U 0.0088 UDibromochloromethane 6.90 U 0.0088 UChloroethane 14.0 U 0.018 UChloroform 6.90 U 0.0088 UChloromethane 14.0 U 0.018 U1,1-Dichloroethane 6.90 U 0.0088 U1,2-Dichloroethane 6.90 U 0.0088 U1,1-Dichloroethene 6.90 U 0.0088 Ucis-1,2-Dichloroethene 6.90 U 0.0088 Utrans-1,2-Dichloroethene 6.90 U 0.0088 U1,2-Dichloropropane 6.90 U 0.0088 Ucis-1,3-Dichloropropene 6.90 U 0.0088 Utrans-1,3-Dichloropropene 6.90 U 0.0088 UEthyl Benzene 6.90 U 0.0088 U2-Hexanone 69.0 U 0.088 UMethyl Ethyl Ketone 138 U 0.176 U4-Methyl-2-Pentanone 69.0 U 0.088 UMethylene Chloride 20.0 U 0.026 UStyrene 6.90 U 0.0651,1,2,2-Tetrachloroethane 6.90 U 0.0088 UTetrachloroethene 6.90 U 0.0088 UToluene 6.90 U 0.0211,1,1-Trichloroethane 6.90 U 0.0088 U1,1,2-Trichloroethane 6.90 U 0.0088 UTrichloroethene 6.90 U 0.0088 UVinyl chloride 6.90 U 0.0088 UXylenes (total) 20.7 U 0.0264 UTICs NA NANotes:

Compound

1) U - Compound/analyte not detected. The associated value is the reporting limit.2) NA - Not analyzed.


Table 9 (Continued)Potential Source Material Analytical Results

Aurora MGP Site


2-4 2-4TCL SVOCs (mg/kg)

4-Chloro-3-methylphenol 176 U 4.40 U2-Chlorophenol 176 U 4.40 U2,4-Dichlorophenol 176 U 4.40 U2,4-Dimethylphenol 176 U 4.40 U2,4-Dinitrophenol 851 U 21.0 U4,6-Dinitro-2-methylphenol 851 U 21.0 U2-Methylphenol 176 U 4.40 U4-Methylphenol 176 U 4.40 U2-Nitrophenol 176 U 4.40 U4-Nitrophenol 851 U 21.0 UPentachlorophenol 851 U 21.0 UPhenol 176 U 4.40 U2,4,5-Trichlorophenol 176 U 4.40 U2,4,6-Trichlorophenol 176 U 4.40 UAcenaphthene 176 U 4.40 UAcenaphthylene 176 U 26.4Anthracene 176 U 40.4Benzo(a)anthracene 176 U 86.1Benzo(b)fluoranthene 176 U 38.7Benzo(k)fluoranthene 176 U 43.9Benzo(ghi)perylene 176 U 22.8Benzo(a)pyrene 176 U 29.9Butyl benzyl phthalate 176 U 4.40 UBis(2-chloroethoxy)methane 176 U 4.40 UBis(2-chloroethyl)ether 176 U 4.40 U1,2,4-Trichlorobenzene 176 U 43.90 UBis(2-ethylhexyl)phthalate 176 U 4.40 U4-Bromophenyl phenyl ether 176 U 4.40 UCarbazole 176 U 4.40 U2-Chloronaphthalene 176 U 4.40 U4-Chlorophenyl phenyl ether 176 U 4.40 UChrysene 270 J 91.4Dibenzo(a,h)anthracene 176 U 7.73Dibenzofuran 176 U 4.40 UDi-n-butyl phthalate 176 U 4.40 U1,2-Dichlorobenzene 176 U 4.40 U1,3-Dichlorobenzene 176 U 4.40 UNotes:

Compound

1) U - Compound/analyte not detected. The associated value is the reporting limit.2) J - Estimated value.


Table 9 (Continued)Potential Source Material Analytical Results

Aurora MGP Site


2-4 2-4TCL SVOCs (mg/kg)

4-Chloroaniline 176 U 4.40 U1,4-Dichlorobenzene 176 U 4.40 U3,3-Dichlorobenzidine 351 U 8.70 UDiethyl phthalate 176 U 4.40 UDimethyl phthalate 176 U 4.40 U2,4-Dinitrotoluene 176 U 4.40 U2,6-Dinitrotoluene 176 U 4.40 UDi-n-octyl phthalate 176 U 4.40 UFluoranthene 496 J 193Fluorene 176 U 24.6Hexachlorobenzene 176 U 4.40 UHexachlorobutadiene 176 U 4.40 UHexachlorocyclopentadiene 176 U 4.40 UHexachloroethane 176 U 4.40 UIndeno(1,2,3-cd)pyrene 176 U 22.8Isophorone 176 U 4.40 U2-Methylnaphthalene 426 J 4.40 UNaphthalene 1,320 J 4.40 UNitrobenzene 176 U 4.40 U2-Nitroaniline 851 U 21.0 U3-Nitroaniline 851 U 21.0 U4-Nitroaniline 851 U 21.0 UN-Nitrosodi-n-propylamine 176 U 4.40 UN-Nitrosodiphenylamine 176 U 4.40 U2,2-Oxybis (1-chloropropane) 176 U 4.40 UPhenanthrene 1,040 J 264Pyrene 709 J 264TICs NA NA

Total cyanide 809 J 0.44 UJReactive cyanide 10 U 10 UReactive sulfide 10 UJ 10 UJpH 5.3 1.6Notes:

2) J - Estimated value. 3) NA - Not analyzed.

Compound

1) U - Compound/analyte not detected. The associated value is the reporting limit.



Table 10SPLP Metals and Cyanide Analytical Results

Aurora MGP Site

Sample Location and Depth (feet below ground surface)/ConcentrationSB52-001 SB52-002 SB53-001 SB53-002 SB55-001

Compound/Analyte 1-3 8-10 1-3 8-10 1-3

SPLP RCRA Metals and Cyanide (mg/l)SPLP Arsenic 0.0050 U 0.0050 U 0.0111 0.0050 U 0.0050 USPLP Barium 0.020 U 0.020 U 0.020 U 0.020 U 0.085SPLP Cadmium 0.0020 U 0.0020 U 0.0020 U 0.0020 U 0.0020 USPLP Chromium 0.040 U 0.040 U 0.040 U 0.040 U 0.040 USPLP Lead 0.0050 U 0.0050 U 0.0151 0.0050 U 0.0066SPLP Mercury 0.0002 U 0.0002 U 0.0016 0.0002 U 0.00029SPLP Selenium 0.010 U 0.010 U 0.010 U 0.010 U 0.010 USPLP Silver 0.040 U 0.040 U 0.040 U 0.040 U 0.040 USPLP Cyanide 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UNotes:

1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.


Table 10 (Continued)SPLP Metals and Cyanide Analytical Results

Aurora MGP Site

Sample Location and Depth (feet below ground surface)/ConcentrationSB58A-001 SB58B-001 SB63-001

Compound/Analyte 2-4 8-10 12-14

SPLP RCRA Metals and Cyanide (mg/l)SPLP Arsenic 0.0050 U 0.0050 U 0.0050 USPLP Barium 0.038 0.030 0.020 USPLP Cadmium 0.0020 U 0.0020 U 0.0020 USPLP Chromium 0.040 U 0.040 U 0.040 USPLP Lead 0.0106 0.0050 U 0.0050 USPLP Mercury 0.0002 U 0.0002 U 0.00040SPLP Selenium 0.010 U 0.010 U 0.010 USPLP Silver 0.040 U 0.040 U 0.040 USPLP Cyanide 0.005 U 0.005 U 0.005 UNotes:



Table 11Subsurface Soil Analytical Results

Aurora MGP Site

Sample Location and Depth (feet below ground surface)/ConcentrationSB47B-002 SB48A-002 SB49A-002 SB50A-002 SB50A-003 SB51A-002


Benzene 0.0050 U 0.0050 U 0.0054 U 0.0064 U 0.0053 U 0.0057 UEthylbenzene 0.0050 U 0.0050 U 0.0054 U 0.0064 U 0.0053 U 0.0057 UToluene 0.0050 U 0.0050 U 0.0054 U 0.0064 U 0.0053 U 0.0057 UXylenes (total) 0.0150 U 0.0150 U 0.0162 U 0.0191 U 0.0158 U 0.0171 UStyrene 0.0050 U 0.0050 U 0.0054 U 0.0064 U 0.0053 U 0.0057 U

Phenols (mg/kg)2,4-Dimethylphenol 0.250 U 0.250 U 0.270 U 0.320 U 0.260 U 0.284 UJ2-Methylphenol 0.250 U 0.250 U 0.270 U 0.320 U 0.260 U 0.284 UJ3-,4-Methylphenol 0.250 U 0.250 U 0.270 U 0.320 U 0.260 U 0.284 UJPhenol 0.250 U 0.250 U 0.270 U 0.320 U 0.260 U 0.284 UJ

PAHs (mg/kg)Acenaphthene 0.040 U 0.040 U 0.043 U 0.051 U 0.042 U 0.046 UAcenaphthylene 0.040 U 0.040 U 0.14 0.051 U 0.042 U 0.046 UAnthracene 0.040 U 0.040 U 0.35 0.17 0.042 U 0.046 UBenzo(a)anthracene 0.040 U 0.20 1.7 0.97 0.06 0.046 UBenzo(b)fluoranthene 0.040 U 0.29 0.62 J 0.87 0.042 U 0.046 UBenzo(k)fluoranthene 0.040 U 0.28 0.67 J 0.80 0.042 U 0.046 UBenzo(a)pyrene 0.06 0.35 1.2 1.2 0.042 U 0.046 UBenzo(g,h,i)perylene 0.040 U 0.20 0.36 0.69 0.042 U 0.046 UChrysene 0.04 0.29 1.3 0.85 0.042 U 0.046 UDibenzo(a,h)anthracene 0.040 U 0.04 0.096 0.25 0.042 U 0.046 UFluoranthene 0.06 0.57 3.7 1.2 0.08 0.046 UFluorene 0.040 U 0.040 U 0.048 0.051 U 0.042 U 0.046 UIndeno(1,2,3-cd)pyrene 0.040 U 0.21 0.48 0.64 0.042 U 0.046 UNaphthalene 0.040 U 0.040 U 0.05 0.06 0.042 U 0.046 UPhenanthrene 0.040 U 0.15 0.35 0.54 0.042 U 0.046 UPyrene 0.06 0.46 2.9 0.96 0.05 0.046 UDibenzofuran 0.250 U 0.250 U 0.270 U 0.320 U 0.260 U 0.284 UJ2-Methylnaphthalene 0.250 U 0.250 U 0.270 U 0.320 U 0.260 U 0.284 UJ

RCRA Metals and Cyanide (mg/kg)Arsenic 16 9.2 3.5 59 2.8 2.8Barium 97 J 44 J 19 J 140 J 19 J 26 JCadmium 0.50 U 0.50 U 0.54 U 1.0 0.53 U 0.57 UChromium 18 13 8.6 32 9.2 9.2Lead 32 7.3 5.2 68 6.3 5.7Mercury 0.073 J 0.040 U 0.043 U 0.060 J 0.042 U 0.046 USelenium 1.5 U 1.5 U 1.6 U 1.9 U 1.6 U 1.7 USilver 2.0 U 2.0 U 2.2 U 2.5 U 2.1 U 2.4Total Cyanide 0.25 UJ 0.25 UJ 1.13 0.32 UJ 0.26 UJ 0.28 UJAmenable Cyanide NA NA NA NA NA NA

Miscellaneous AnalysespH (unitless) 8.4 J NA 8.7 NA NA 8.4TOC (percent) 21.5 NA 0.5 NA NA 1.5Notes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.3) NA - Not analyzed.


Table 11 (Continued)Subsurface Soil Analytical Results

Aurora MGP Site

Sample Location and Depth (feet below ground surface)/ConcentrationSB52-002 SB53-002 SB54A-003 SB54A-004 SB55-002 SB58B-001 SB63-001

Compound/Analyte 8-10 8-10 10-12 16-18 8-10 8-10 12-14BTEX/Styrene (mg/kg)

Benzene NA NA 0.0052 U 0.0055 U NA NA NAEthylbenzene NA NA 0.0052 U 0.0055 U NA NA NAToluene NA NA 0.0052 U 0.0055 U NA NA NAXylenes (total) NA NA 0.0156 U 0.0164 U NA NA NAStyrene NA NA 0.0052 U 0.0055 U NA NA NA

Phenols (mg/kg)2,4-Dimethylphenol NA NA 0.260 U 0.270 U NA NA NA2-Methylphenol NA NA 0.260 U 0.270 U NA NA NA3-,4-Methylphenol NA NA 0.260 U 0.270 U NA NA NAPhenol NA NA 0.260 U 0.270 U NA NA NA

PAHs (mg/kg)Acenaphthene NA NA 0.05 0.20 NA NA NAAcenaphthylene NA NA 0.07 0.24 NA NA NAAnthracene NA NA 0.06 0.15 NA NA NABenzo(a)anthracene NA NA 0.09 0.15 NA NA NABenzo(b)fluoranthene NA NA 0.042 U 0.07 NA NA NABenzo(k)fluoranthene NA NA 0.042 U 0.044 U NA NA NABenzo(a)pyrene NA NA 0.042 0.08 NA NA NABenzo(g,h,i)perylene NA NA 0.042 U 0.044 U NA NA NAChrysene NA NA 0.09 0.20 NA NA NADibenzo(a,h)anthracene NA NA 0.042 U 0.044 U NA NA NAFluoranthene NA NA 0.06 0.13 NA NA NAFluorene NA NA 0.2 0.80 NA NA NAIndeno(1,2,3-cd)pyrene NA NA 0.042 U 0.044 U NA NA NANaphthalene NA NA 0.12 0.08 NA NA NAPhenanthrene NA NA 0.74 0.35 NA NA NAPyrene NA NA 0.06 0.15 NA NA NADibenzofuran NA NA 0.260 U 0.270 U NA NA NA2-Methylnaphthalene NA NA 0.260 U 0.270 U NA NA NA

RCRA Metals and Cyanide (mg/kg)Arsenic 3.6 4.0 2.0 3.4 NA 8.0 8.7Barium 13 J 32 J 16 J 13 J NA 65 J 4.7 JCadmium 0.53 U 0.54 U 0.52 U 0.55 U NA 0.74 0.80 UChromium 9.7 12 9.0 8.3 NA 15 7.7Lead 4.5 8.1 5.2 6.0 NA 43 9.5Mercury 0.043 U 0.043 U 0.042 U 0.044 U NA 0.081 J 0.27 JSelenium 1.6 U 1.6 U 1.6 U 1.6 U NA 1.9 U 2.4 USilver 2.5 2.4 2.8 2.6 NA 2.5 U 4.0Total Cyanide 0.27 UJ 0.27 UJ 0.26 UJ 0.27 UJ NA 0.31 UJ 0.40 UAmenable Cyanide NA NA NA NA NA NA NA

Miscellaneous AnalysespH (unitless) 8.7 J 8.2 NA NA 8.2 J 7.3 12.4 JTOC (percent) 0.7 0.7 NA NA 0.6 3.7 NANotes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.3) NA - Not analyzed.


Sample Location and Date Sampled/Concentration

Compound/Analyte

Benzene 0.0005 U 0.0005 U 0.0005 U 0.0005 U

Ethylbenzene 0.0005 U 0.0005 U 0.0005 U 0.0005 U

Toluene 0.0005 U 0.0005 U 0.0005 U 0.0005 U

Xylenes (total) 0.0005 U 0.0005 U 0.0005 U 0.0005 U

Styrene 0.0005 U 0.0005 U 0.0005 U 0.0005 U

Phenols (mg/l)

2,4-Dimethylphenol 0.01 U 0.01 U 0.01 U 0.01 U

2-Methylphenol 0.01 U 0.01 U 0.01 U 0.01 U


Phenol 0.01 U 0.01 U 0.01 U 0.01 U

Acenaphthene 0.0024 U 0.0023 U 0.0024 U 0.0024 U

Acenaphthylene 0.0012 U 0.0012 U 0.0012 U 0.0012 U

Anthracene 0.000047 U 0.000047 U 0.000048 U 0.000048 U

Benzo(a)anthracene 0.00012 U 0.00012 U 0.00012 U 0.00012 U

Benzo(a)pyrene 0.00012 U 0.00012 U 0.00012 U 0.00012 U

Benzo(b)fluoranthene 0.000047 U 0.000047 U 0.000048 U 0.000048 U

Benzo(g,h,i)perylene 0.00019 U 0.00019 U 0.00019 U 0.00019 U

Benzo(k)fluoranthene 0.000047 U 0.000047 U 0.000048 U 0.000048 U

Chrysene 0.00012 U 0.00012 U 0.00012 U 0.00012 U

Dibenzo(a,h)anthracene 0.00028 U 0.00028 U 0.00029 U 0.00029 U

Fluoranthene 0.00012 U 0.00012 U 0.00012 U 0.00012 U

Fluorene 0.00024 U 0.00023 U 0.00024 U 0.00024 U

Indeno(1,2,3-cd)pyrene 0.00012 U 0.00012 U 0.00012 U 0.00012 U

Naphthalene 0.0012 U 0.0012 U 0.0012 U 0.0012 U

Phenanthrene 0.000094 U 0.000093 U 0.000095 U 0.000095 U

Dibenzofuran 0.01 U 0.01 U 0.01 U 0.01 U

Pyrene 0.00024 U 0.00023 U 0.00024 U 0.00024 U

2-Methylnaphthalene 0.01 U 0.01 U 0.01 U 0.01 U

Arsenic,Total 0.01 U 0.011 0.01 U 0.01 U

Barium,Total 0.0852 0.149 0.0972 0.327

Cadmium,Total 0.002 U 0.002 U 0.002 U 0.002 U

Chromium,Total 0.01 U 0.01 U 3.82 0.01 U

Lead,Total 0.005 U 0.005 U 0.008 0.005 U

Mercury,Total 0.0002 U 0.0002 U 0.0002 U 0.0002 U

Selenium,Total 0.005 U 0.005 U 0.005 U 0.0051

Silver,Total 0.005 U 0.005 U 0.005 U 0.005 UCyanide,Total 0.01 U 0.01 U 0.01 U 0.01 UNotes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.

RCRA Metals and Total Cyanide (mg/l)

PAHs (mg/l)

BTEX (mg/l)

5/17/01

Table 12 May 2001 Groundwater Analytical Results

Aurora MGP Site

SMW01-001

5/16/01

SMW02-001

5/17/01

SMW03-001

5/17/01

SMW05-001

Aurora MGP Site 1 of 3SSI Report


Compound/Analyte

Benzene 0.0005 U 0.0005 U 0.003 0.007 J

Ethylbenzene 0.0005 U 0.0005 U 0.0005 U 0.067

Toluene 0.0005 U 0.0005 U 0.0005 U 0.002 J

Xylenes (total) 0.0005 U 0.0005 U 0.0005 U 0.035 J

Styrene 0.0005 U 0.0005 U 0.0005 U 0.0005 UJ

2,4-Dimethylphenol 0.01 U 0.01 U 0.01 U 0.01 U



Phenol 0.01 U 0.01 U 0.01 U 0.01 U

Acenaphthene 0.0025 U 0.0024 U 0.0024 U 0.23

Acenaphthylene 0.0013 U 0.0012 U 0.0013 U 0.26

Anthracene 0.00005 U 0.000048 U 0.000049 U 0.0037

Benzo(a)anthracene 0.00013 U 0.00012 U 0.00013 U 0.00065

Benzo(a)pyrene 0.00013 U 0.00012 U 0.00013 U 0.00032

Benzo(b)fluoranthene 0.00005 U 0.000048 U 0.000049 U 0.00014

Benzo(g,h,i)perylene 0.0002 U 0.00019 U 0.00019 U 0.00019 U

Benzo(k)fluoranthene 0.00005 U 0.000048 U 0.000049 U 0.000068

Chrysene 0.00013 U 0.00012 U 0.00013 U 0.0006

Dibenzo(a,h)anthracene 0.0003 U 0.00029 U 0.00029 U 0.00029 U

Fluoranthene 0.00013 U 0.00012 U 0.00013 U 0.0082

Fluorene 0.00025 U 0.00024 U 0.00024 U 0.032

Indeno(1,2,3-cd)pyrene 0.00013 U 0.00012 U 0.00013 U 0.00013

Naphthalene 0.0013 U 0.0012 U 0.0013 U 0.67

Phenanthrene 0.0001 U 0.000095 U 0.000097 U 0.015

Dibenzofuran 0.01 U 0.01 U 0.01 U 0.01 U

Pyrene 0.00025 U 0.00024 U 0.00024 U 0.0063

2-Methylnaphthalene 0.01 U 0.01 U 0.01 U 0.035

Arsenic,Total 0.01 U 0.01 U 0.01 U 0.01 U

Barium,Total 0.153 0.0876 0.152 0.0966

Cadmium,Total 0.002 U 0.002 U 0.002 U 0.002 U

Chromium,Total 0.138 1.14 0.01 U 0.01 U

Lead,Total 0.005 U 0.005 U 0.005 U 0.005 U

Mercury,Total 0.0002 U 0.0002 U 0.0002 U 0.0002 U

Selenium,Total 0.005 U 0.005 U 0.005 U 0.005 U

Silver,Total 0.005 U 0.005 U 0.005 U 0.005 UCyanide,Total 0.01 U 0.01 U 0.01 U 0.0186Notes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.


PAHs (mg/l)

Phenols (mg/l)

BTEX (mg/l)

5/18/01

SMW08-001

5/18/01

SMW09-001

Table 12 (Continued) May 2001 Groundwater Analytical Results

Aurora MGP Site

SMW06-001

5/16/01

SMW07-001

5/18/01


Table 12 (Continued) May 2001 Groundwater Analytical Results

Aurora MGP Site


Compound/Analyte

BTEX (mg/l)Benzene 0.5 0.0005 U 0.0005 U 0.0005 UJ 2.5Ethylbenzene 0.21 0.0005 U 0.0005 U 0.0005 UJ 0.5Toluene 0.03 0.0005 U 0.0005 U 0.0005 UJ 0.038 JXylenes (total) 0.26 0.0005 U 0.0005 U 0.0005 UJ 0.33 JStyrene 0.023 0.0005 U 0.0005 U 0.0005 UJ 0.005 UJ

Phenols (mg/l)2,4-Dimethylphenol 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U2-Methylphenol 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U4-Methylphenol 0.01 U 0.01 U 0.01 U 0.01 U 0.01 UPhenol 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U

Acenaphthene 0.082 J 0.0023 U 0.0024 U 0.0025 U 0.14Acenaphthylene 0.44 J 0.0012 U 0.0012 U 0.0013 U 0.27Anthracene 0.0031 J 0.000047 U 0.000047 U 0.000049 U 0.00056Benzo(a)anthracene 0.0025 U 0.00012 U 0.00012 U 0.00013 U 0.00012 UBenzo(a)pyrene 0.0025 U 0.00012 U 0.00012 U 0.00013 U 0.00012 UBenzo(b)fluoranthene 0.00096 U 0.000047 U 0.000047 U 0.000049 U 0.000048 UBenzo(g,h,i)perylene 0.0038 U 0.00019 U 0.00019 U 0.0002 U 0.00019 UBenzo(k)fluoranthene 0.00096 U 0.000047 U 0.000047 U 0.000049 U 0.000048 UChrysene 0.0025 U 0.00012 U 0.00012 U 0.00013 U 0.00012 UDibenzo(a,h)anthracene 0.0058 U 0.00028 U 0.00028 U 0.00029 U 0.00029 UFluoranthene 0.0025 U 0.00012 U 0.00012 U 0.00013 U 0.00012 UFluorene 0.0062 J 0.00023 U 0.00024 U 0.00025 U 0.0098Indeno(1,2,3-cd)pyrene 0.0025 U 0.00012 U 0.00012 U 0.00013 U 0.00012 UNaphthalene 0.92 J 0.0012 U 0.0012 U 0.0013 U 0.43Phenanthrene 0.023 J 0.000093 U 0.000094 U 0.000098 U 0.0028Dibenzofuran 0.01 U 0.01 U 0.01 U 0.01 U 0.01 UPyrene 0.0048 U 0.00023 U 0.00024 U 0.00025 U 0.00024 U2-Methylnaphthalene 0.11 0.01 U 0.01 U 0.01 U 0.013

Arsenic,Total 0.01 U 0.01 U 0.01 U 0.01 U 0.01 UBarium,Total 0.091 0.121 0.170 0.0784 0.0997Cadmium,Total 0.002 U 0.002 U 0.002 U 0.002 U 0.0065Chromium,Total 0.01 U 0.01 U 0.01 U 0.01 U 0.01 ULead,Total 0.005 U 0.0061 0.005 U 0.005 U 0.005 UMercury,Total 0.0002 U 0.0002 U 0.0002 U 0.0002 U 0.0002 USelenium,Total 0.005 U 0.005 U 0.005 U 0.005 U 0.005 USilver,Total 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UCyanide,Total 0.01 U 0.01 U 0.01 U 0.01 U 0.01 UNotes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.

5/17/01

DMW02-001

5/17/01

DMW03-001

5/17/01

PAHs (mg/l)


DMW01-001 DMW04-001

5/18/01

DMW09-001

5/18/01


Table 13January 2002 Groundwater Analytical Results

Aurora MGP Site

Sample Location and Date Sampled/ConcentrationCompound/Analyte SMW01-001 SMW02-001 SMW03-001 SMW05-001 SMW06-001

1/22/02 1/22/02 1/24/02 1/24/02 1/24/02BTEX/Styrene (mg/l)

Benzene 0.0005 U 0.0005 U 0.0005 U 0.0007 0.0005 UEthylbenzene 0.0005 U 0.0005 U 0.0005 U 0.0005 U 0.0005 UToluene 0.0005 U 0.0005 U 0.0005 U 0.0005 U 0.0005 UXylenes (total) 0.0005 U 0.0005 U 0.0005 U 0.0005 U 0.0005 UStyrene 0.0005 U 0.0005 U 0.0005 U 0.0005 U 0.0005 U


PAHs (mg/l)Acenaphthene 0.0005 U 0.0005 U 0.0005 U 0.0005 U 0.0005 UAcenaphthylene 0.0005 U 0.0005 U 0.0005 U 0.0005 U 0.0005 UAnthracene 0.0005 U 0.0005 U 0.0005 U 0.0005 U 0.0005 UBenzo(a)anthracene 0.0001 U 0.0001 U 0.0001 U 0.0001 U 0.0001 UBenzo(b)fluoranthene 0.0001 U 0.0001 U 0.0001 U 0.0001 U 0.0001 UBenzo(k)fluoranthene 0.0001 U 0.0001 U 0.0001 U 0.0001 U 0.0001 UBenzo(a)pyrene 0.0001 U 0.0001 U 0.0001 U 0.0001 U 0.0001 UBenzo(g,h,i)perylene 0.0005 U 0.0005 U 0.0005 U 0.0005 U 0.0005 UChrysene 0.0005 U 0.0005 U 0.0005 U 0.0005 U 0.0005 UDibenzo(a,h)anthracene 0.0001 U 0.0001 U 0.0001 U 0.0001 U 0.0001 UFluoranthene 0.0005 U 0.0005 U 0.0005 U 0.0005 U 0.0005 UFluorene 0.0005 U 0.0005 U 0.0005 U 0.0005 U 0.0005 UIndeno(1,2,3-cd)pyrene 0.0001 U 0.0001 U 0.0001 U 0.0001 U 0.0001 UNaphthalene 0.0005 U 0.0005 U 0.0005 U 0.0005 U 0.0005 UPhenanthrene 0.0005 U 0.0005 U 0.0005 U 0.0005 U 0.0005 UPyrene 0.0005 U 0.0005 U 0.0005 U 0.0005 U 0.0005 UDibenzofuran 0.0005 U 0.0005 U 0.0005 U 0.0005 U 0.0005 U2-Methylnaphthalene 0.0005 U 0.0005 U 0.0005 U 0.0005 U 0.0005 U

RCRA Metals and Cyanide (mg/l)Arsenic 0.0100 U 0.0100 U 0.0100 U 0.0100 U 0.0100 UBarium 0.0831 0.140 0.0585 0.211 0.111Cadmium 0.0020 U 0.0020 U 0.0020 U 0.0020 U 0.0020 UChromium 0.0100 U 0.0100 U 0.324 0.0100 U 2.26Lead 0.0050 U 0.0050 U 0.0050 U 0.0050 U 0.0050 UMercury 0.00020 U 0.00020 U 0.00020 U 0.00020 U 0.00020 USelenium 0.0100 U 0.0100 U 0.0100 U 0.0100 U 0.0100 USilver 0.0050 U 0.0050 U 0.0050 U 0.0050 U 0.0050 UCyanide, Total 0.0100 UJ 0.0100 UJ 0.0100 UJ 0.0100 UJ 0.0100 UJNotes:


2) J - Estimated value.

Aurora MGP Site1 of 5

SSI Report

Table 13 (Continued)January 2002 Groundwater Analytical Results

Aurora MGP Site


1/24/02 1/25/02 1/25/02 1/21/02 1/23/02BTEX/Styrene (mg/l)

Benzene 0.0005 U 0.002 0.006 0.0005 U 0.0005 UEthylbenzene 0.0005 U 0.0005 U 0.075 0.0005 U 0.0005 UToluene 0.0005 U 0.0005 U 0.002 0.0005 U 0.0005 UXylenes (total) 0.0005 U 0.0005 U 0.048 0.0005 U 0.0005 UStyrene 0.0005 U 0.0005 U 0.0005 U 0.0005 U 0.0005 U


PAHs (mg/l)Acenaphthene 0.0005 U 0.0005 U 0.072 0.0005 U 0.0005 UAcenaphthylene 0.0005 U 0.0005 U 0.004 0.0005 U 0.0005 UAnthracene 0.0005 U 0.0005 U 0.003 0.0005 U 0.0005 UBenzo(a)anthracene 0.0001 U 0.00009 U 0.0001 U 0.0001 U 0.0001 UBenzo(b)fluoranthene 0.0001 U 0.00009 U 0.0001 U 0.0001 U 0.0001 UBenzo(k)fluoranthene 0.0001 U 0.00009 U 0.0001 U 0.0001 U 0.0001 UBenzo(a)pyrene 0.0001 U 0.00009 U 0.0001 U 0.0001 U 0.0001 UBenzo(g,h,i)perylene 0.0005 U 0.0005 U 0.0005 U 0.0005 U 0.0005 UChrysene 0.0005 U 0.0005 U 0.0005 U 0.0005 U 0.0005 UDibenzo(a,h)anthracene 0.0001 U 0.00009 U 0.0001 U 0.0001 U 0.0001 UFluoranthene 0.0005 U 0.0005 U 0.004 0.0005 U 0.0005 UFluorene 0.0005 U 0.0005 U 0.018 0.0005 U 0.0005 UIndeno(1,2,3-cd)pyrene 0.0001 U 0.00009 U 0.0001 U 0.0001 U 0.0001 UNaphthalene 0.0005 U 0.0005 U 0.39 0.0005 U 0.0005 UPhenanthrene 0.0005 U 0.0005 U 0.009 0.0005 U 0.0005 UPyrene 0.0005 U 0.0005 U 0.004 0.0005 U 0.0005 UDibenzofuran 0.0005 U 0.0005 U 0.003 0.0005 U 0.0005 U2-Methylnaphthalene 0.0005 U 0.0005 U 0.032 0.0005 U 0.0005 U

RCRA Metals and Cyanide (mg/l)Arsenic 0.0100 U 0.0100 U 0.0100 U 0.0100 U 0.0100 UBarium 0.0602 0.164 0.0795 0.0635 0.0664Cadmium 0.0020 U 0.0020 U 0.0020 U 0.0020 U 0.0020 UChromium 0.489 0.0495 0.0100 U 0.313 0.232Lead 0.0050 U 0.0050 U 0.0050 U 0.0050 U 0.0050 UMercury 0.00020 U 0.00020 U 0.00020 U 0.00020 U 0.00020 USelenium 0.0100 U 0.0100 U 0.0100 U 0.0100 U 0.0100 USilver 0.0050 U 0.0050 U 0.0050 U 0.0050 U 0.0050 UCyanide, Total 0.0100 UJ 0.0100 UJ 0.0100 UJ 0.0100 UJ 0.0100 UJNotes:




SSI Report


Aurora MGP Site

Sample Location and Date Sampled/ConcentrationCompound/Analyte SMW12-001 SMW13-001 SMW14-001 SMW15-001* SMW15-002

1/22/02 1/23/02 1/22/02 1/25/02 1/25/02BTEX/Styrene (mg/l)

Benzene 0.0005 U 0.0005 U 0.002 340 2.2Ethylbenzene 0.0005 U 0.0005 U 0.0005 U 3,000 1.2Toluene 0.0005 U 0.0005 U 0.0005 U 43 J 0.084Xylenes (total) 0.0005 U 0.0005 U 0.0005 U 2,000 0.95Styrene 0.0005 U 0.0005 U 0.0005 U 2.5 U 0.012 U

Phenols (mg/l)2,4-Dimethylphenol 0.0005 U 0.0005 U 0.0005 U 0.026 J 0.15 U2-Methylphenol 0.0005 U 0.0005 U 0.0005 U 0.023 J 0.15 U4-Methylphenol 0.0005 U 0.0005 U 0.0005 U 0.027 J 0.15 UPhenol 0.0005 U 0.0005 U 0.0005 U 0.037 J 0.15 U

PAHs (mg/l)Acenaphthene 0.0005 U 0.0005 U 0.002 8.6 J 66 JAcenaphthylene 0.0005 U 0.0005 U 0.001 0.57 J 4.1 JAnthracene 0.0005 U 0.0005 U 0.0005 U 4.0 J 31 JBenzo(a)anthracene 0.00009 U 0.0001 U 0.0001 U 1.4 J 11 JBenzo(b)fluoranthene 0.0002 0.0001 U 0.0001 U 1.1 J 8.4 JBenzo(k)fluoranthene 0.00009 U 0.0001 U 0.0001 U 0.63 J 5.1 JBenzo(a)pyrene 0.00009 U 0.0001 U 0.0001 U 1.5 J 12 JBenzo(g,h,i)perylene 0.0005 U 0.0005 U 0.0005 U 0.54 J 4.3 JChrysene 0.0005 U 0.0005 U 0.0005 U 1.1 J 7.8 JDibenzo(a,h)anthracene 0.00009 U 0.0001 U 0.0001 U 0.13 J 1.1 JFluoranthene 0.0005 U 0.0005 U 0.0005 U 5.3 J 46 JFluorene 0.0005 U 0.0005 U 0.0005 U 3.9 J 27 JIndeno(1,2,3-cd)pyrene 0.0007 0.0001 U 0.0001 U 0.57 J 4.4 JNaphthalene 0.0005 U 0.0005 0.0005 U 32 J 220 JPhenanthrene 0.0005 U 0.0005 U 0.0005 U 13 J 110 JPyrene 0.0005 U 0.0005 U 0.0005 U 4.5 J 35 JDibenzofuran 0.0005 U 0.0005 U 0.0005 U 1.0 J 7.7 J2-Methylnaphthalene 0.0005 U 0.0005 U 0.0005 U 5.8 J 36 J

RCRA Metals and Cyanide (mg/l)Arsenic 0.0100 U 0.0100 U 0.0100 U 2.16 0.0906Barium 0.119 0.158 0.192 0.182 0.655Cadmium 0.0020 U 0.0020 U 0.0020 U 0.0020 U 0.0020 UChromium 0.0100 U 0.0100 U 0.0100 U 0.419 0.216Lead 0.0050 U 0.0050 U 0.0050 U 0.0120 0.0494Mercury 0.00020 U 0.00020 U 0.00020 U 0.00020 U 0.00020 USelenium 0.0100 U 0.0100 U 0.0100 U 0.0679 0.0100 USilver 0.0050 U 0.0050 U 0.0050 U 0.0050 U 0.0050 UCyanide, Total 0.0121 J 0.0100 UJ 0.0100 UJ 0.467 UJ 0.393 JNotes:

1) * - Represents sample of LNAPL collected from the well.




SSI Report


Aurora MGP Site

Sample Location and Date Sampled/ConcentrationCompound/Analyte DMW01-001 DMW02-001 DMW03-001 DMW04-001 DMW05-001

1/22/02 1/22/02 1/23/02 1/24/02 1/24/02

Benzene 0.17 0.0005 U 0.0005 U 0.0005 U 0.047Ethylbenzene 0.14 0.0005 U 0.0005 U 0.0005 U 0.003Toluene 0.070 0.0005 U 0.0005 U 0.0005 U 0.002Xylenes (total) 0.45 0.0005 U 0.0005 U 0.0005 U 0.004Styrene 0.13 0.0005 U 0.0005 U 0.0005 U 0.0005 U

2,4-Dimethylphenol 0.001 0.0009 U 0.0005 U 0.0005 U 0.0005 U2-Methylphenol 0.0006 0.0009 U 0.0005 U 0.0005 U 0.0005 U4-Methylphenol 0.001 0.0009 U 0.0005 U 0.0005 U 0.0005 UPhenol 0.002 0.0009 U 0.0005 U 0.0005 U 0.0005 U

Acenaphthene 0.007 0.0009 U 0.0005 U 0.0005 U 0.0005 UAcenaphthylene 0.11 0.0009 U 0.0005 U 0.0005 U 0.0005 UAnthracene 0.005 0.0009 U 0.0005 U 0.0005 U 0.0005 UBenzo(a)anthracene 0.00009 U 0.0002 U 0.00009 U 0.0001 U 0.00009 UBenzo(b)fluoranthene 0.00009 U 0.0002 U 0.00009 U 0.0001 U 0.00009 UBenzo(k)fluoranthene 0.00009 U 0.0002 U 0.00009 U 0.0001 U 0.00009 UBenzo(a)pyrene 0.00009 U 0.0002 U 0.0002 0.0001 U 0.00009 UBenzo(g,h,i)perylene 0.0005 U 0.0009 U 0.0005 U 0.0005 U 0.0005 UChrysene 0.0005 U 0.0009 U 0.0005 U 0.0005 U 0.0005 UDibenzo(a,h)anthracene 0.00009 U 0.0002 U 0.00009 U 0.0001 U 0.00009 UFluoranthene 0.001 0.0009 U 0.0005 U 0.0005 U 0.0005 UFluorene 0.023 0.0009 U 0.0005 U 0.0005 U 0.0005 UIndeno(1,2,3-cd)pyrene 0.00009 U 0.0002 U 0.00009 U 0.0001 U 0.00009 UNaphthalene 2.6 0.0009 U 0.001 0.0005 U 0.0005Phenanthrene 0.027 0.0009 U 0.0005 0.0005 U 0.0005 UPyrene 0.001 0.0009 U 0.0005 U 0.0005 U 0.0005 UDibenzofuran 0.005 0.0009 U 0.0005 U 0.0005 U 0.0005 U2-Methylnaphthalene 0.20 0.0009 U 0.0005 U 0.0005 U 0.0005 U

RCRA Metals and Cyanide (mg/l)Arsenic 0.0100 U 0.0100 U 0.0100 U 0.0100 U 0.0100 UBarium 0.0819 0.122 0.150 0.0692 0.226Cadmium 0.0020 U 0.0020 U 0.0020 U 0.0020 U 0.0020 UChromium 0.0100 U 0.0100 U 0.0100 U 0.0100 U 0.0100 ULead 0.0050 U 0.0050 U 0.0050 U 0.0050 U 0.0050 UMercury 0.00020 U 0.00020 U 0.00020 U 0.00020 U 0.00020 USelenium 0.0100 U 0.0100 U 0.0100 U 0.0100 U 0.0100 USilver 0.0050 U 0.0050 U 0.0050 U 0.0050 U 0.0050 UCyanide, Total 0.0100 U 0.0100 U 0.0102 0.0100 U 0.0100 UNote:


BTEX/Styrene (mg/l)

Phenols (mg/l)

PAHs (mg/l)


SSI Report

Compound/Analyte DMW09-001 DMW10-001 DMW11-001 DMW12-001 DMW13-001 DMW14-0011/25/02 1/21/02 1/23/02 1/22/02 1/23/02 1/22/02

Benzene 7.2 0.001 0.005 0.0005 U 0.033 0.0005 UEthylbenzene 1.8 0.0005 U 0.009 0.0005 U 0.016 0.0005 UToluene 2.0 0.0005 U 0.037 0.0005 U 0.0005 U 0.0005 UXylenes (total) 1.4 0.0005 U 0.10 0.0005 U 0.014 0.0005 UStyrene 0.025 U 0.0005 U 0.040 0.0005 U 0.0005 U 0.0005 U

2,4-Dimethylphenol 0.005 0.0005 U 0.005 U 0.0005 U 0.0005 U 0.0005 U2-Methylphenol 0.002 0.0005 U 0.005 U 0.0005 U 0.0005 U 0.0005 U4-Methylphenol 0.002 0.0005 U 0.005 0.0005 U 0.0005 U 0.0005 UPhenol 0.016 0.0005 U 0.005 U 0.0005 U 0.0005 U 0.0005 U

Acenaphthene 0.041 0.0005 U 0.013 0.0005 U 0.0005 U 0.0005 UAcenaphthylene 0.019 0.0005 U 0.24 0.0005 U 0.0005 U 0.0005 UAnthracene 0.0009 U 0.0005 U 0.017 0.0005 U 0.0005 U 0.0005 UBenzo(a)anthracene 0.0001 U 0.00009 U 0.003 0.0001 U 0.0001 U 0.0001 UBenzo(b)fluoranthene 0.0001 U 0.00009 U 0.002 0.0001 U 0.0001 U 0.0001 UBenzo(k)fluoranthene 0.0001 U 0.00009 U 0.001 U 0.0001 U 0.0001 U 0.0001 UBenzo(a)pyrene 0.0001 U 0.00009 U 0.002 0.0001 U 0.0001 U 0.0001 UBenzo(g,h,i)perylene 0.0005 U 0.0005 U 0.005 U 0.0005 U 0.0005 U 0.0005 UChrysene 0.0005 U 0.0005 U 0.005 U 0.0005 U 0.0005 U 0.0005 UDibenzo(a,h)anthracene 0.0001 U 0.00009 U 0.001 U 0.0001 U 0.0001 U 0.0001 UFluoranthene 0.0005 U 0.0005 U 0.009 0.0005 U 0.0005 U 0.0005 UFluorene 0.008 0.0005 U 0.046 0.0005 U 0.0005 U 0.0005 UIndeno(1,2,3-cd)pyrene 0.0001 U 0.00009 U 0.001 U 0.0001 U 0.0001 U 0.0001 UNaphthalene 0.92 0.0005 U 3.7 0.0005 U 0.004 0.0005 UPhenanthrene 0.004 0.0005 U 0.066 0.0005 U 0.0005 U 0.0005 UPyrene 0.0005 U 0.0005 U 0.01 0.0005 U 0.0005 U 0.0005 UDibenzofuran 0.001 0.0005 U 0.006 0.0005 U 0.0005 U 0.0005 U2-Methylnaphthalene 0.032 0.0005 U 0.55 0.0005 U 0.001 0.0005 U

Arsenic 0.0100 U 0.0100 U 0.0100 U 0.0100 U 0.0100 U 0.0100 UBarium 0.0956 0.0620 0.100 0.129 0.208 0.131Cadmium 0.0020 U 0.0020 U 0.0020 U 0.0020 U 0.0020 U 0.0020 UChromium 0.0100 U 0.0100 U 0.0100 U 0.0100 U 0.0100 U 0.0100 ULead 0.0050 U 0.0050 U 0.0050 U 0.0050 U 0.0050 U 0.0050 UMercury 0.00020 U 0.00020 U 0.00020 U 0.00020 U 0.00020 U 0.00020 USelenium 0.0100 U 0.0100 U 0.0100 U 0.0100 U 0.0100 U 0.0100 USilver 0.0050 U 0.0050 U 0.0050 U 0.0050 U 0.0050 U 0.0050 UCyanide, Total 0.0100 U 0.0100 U 0.0100 U 0.0100 U 0.0112 0.0100 UNote:


RCRA Metals and Cyanide (mg/l)



Aurora MGP Site

BTEX/Styrene (mg/l)

Phenols (mg/l)

PAHs (mg/l)


SSI Report

Table 14January 2002 Groundwater Additional Analytical Results

Aurora MGP Site


1/22/02 1/22/02 1/24/02 1/24/02 1/24/02Additional Parameters (mg/l)

Alkalinity 400 350 220 560 390Sulfate 120 110 73 5.0 U 61Chloride 280 J 120 J 130 J 250 J 320 JFerric Iron 8.11 2.58 3.50 6.29 22.7Ferric Iron, Dissolved NA 0.915 U 0.050 U 2.46 0.278Ferrous Iron 0.050 U 0.050 U 0.050 0.050 U 0.050 UFerrous Iron, Dissolved NA 0.050 U 0.050 0.050 U 0.050 UNitrate & Nitrite 0.44 0.18 3.7 0.10 U 5.6

Metals and Cyanide (mg/l)Arsenic, Dissolved NA 0.0100 U 0.0100 U 0.0100 U 0.0100 UBarium, Dissolved NA 0.132 0.0462 0.209 0.0975Cadmium, Dissolved NA 0.0020 U 0.0020 U 0.0020 U 0.0020 UChromium, Dissolved NA 0.0100 U 0.0100 U 0.0100 U 0.0179Iron 8.11 2.58 3.55 6.29 22.7Iron, Dissolved NA 0.915 0.0500 U 6.46 0.278Lead, Dissolved NA 0.0050 U 0.0050 U 0.0050 U 0.0050 UMagnesium 61.1 63.7 40.0 35.9 45.7Magnesium, Dissolved NA 62.1 35.2 37.6 50.1Mercury, Dissolved NA 0.200 U 0.200 U 0.00020 U 0.200 USelenium, Dissolved NA 0.0100 U 0.0100 U 0.0100 U 0.0100 USilver, Dissolved NA 0.0050 U 0.0050 U 0.0050 U 0.0050 UNotes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.3) NA - Not analyzed.


SSI Report

Table 14 (Continued)January 2002 Groundwater Additional Analytical Results

Aurora MGP Site


1/24/02 1/25/02 1/25/02 1/21/02 1/23/02

Alkalinity 210 360 360 330 310Sulfate 52 84 17 71 67Chloride 160 J 83 J 140 J 170 J 200 JFerric Iron 2.97 5.81 1.11 1.59 0.716Ferric Iron, Dissolved NA NA NA NA NAFerrous Iron 0.050 U 0.200 0.050 U 0.050 U 0.050 UFerrous Iron, Dissolved NA NA NA NA NANitrate & Nitrite 2.1 0.10 U 0.10 U 6.0 5.8

Metals and Cyanide (mg/l)Arsenic, Dissolved NA NA NA NA NABarium, Dissolved NA NA NA NA NACadmium, Dissolved NA NA NA NA NAChromium, Dissolved NA NA NA NA NAIron 2.97 6.01 1.11 1.59 0.716Iron, Dissolved NA NA NA NA NALead, Dissolved NA NA NA NA NAMagnesium 30.3 31.2 34.5 49.8 50.9Magnesium, Dissolved NA NA NA NA NAMercury, Dissolved NA NA NA NA NASelenium, Dissolved NA NA NA NA NASilver, Dissolved NA NA NA NA NANotes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.3) NA - Not analyzed.

Additional Parameters (mg/l)


SSI Report


Aurora MGP Site


1/22/02 1/23/02 1/22/02 1/25/02 1/25/02

Alkalinity 380 350 330 NA NASulfate 60 110 52 NA NAChloride 83 J 87 J 110 J NA NAFerric Iron 7.32 1.55 3.07 NA NAFerric Iron, Dissolved 0.050 U NA NA NA NAFerrous Iron 0.050 U 0.050 0.050 U NA NAFerrous Iron, Dissolved 0.050 U NA NA NA NANitrate & Nitrite 3.0 0.10 U 0.10 U NA NA

Metals and Cyanide (mg/l)Arsenic, Dissolved 0.0100 U NA NA NA NABarium, Dissolved 0.0894 NA NA NA NACadmium, Dissolved 0.0020 U NA NA NA NAChromium, Dissolved 0.0100 U NA NA NA NAIron 7.32 1.60 3.07 NA NAIron, Dissolved 0.0500 U NA NA NA NALead, Dissolved 0.0050 U NA NA NA NAMagnesium 54.3 67.1 56.9 173 377Magnesium, Dissolved 43.3 NA NA NA NAMercury, Dissolved 0.200 U NA NA NA NASelenium, Dissolved 0.0100 U NA NA NA NASilver, Dissolved 0.0050 U NA NA NA NANotes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.3) NA - Not analyzed.



SSI Report


Aurora MGP Site

Sample Location and Date Sampled/ConcentrationCompound/Analyte DMW01-001 DMW02-001 DMW03-001 DMW04-001 DMW05-001

1/22/02 1/22/02 1/23/02 1/24/02 1/24/02

Alkalinity 350 350 290 390 560Sulfate 110 100 58 110 41Chloride 89 55 140 160 330Ferric Iron 0.050 U 0.127 0.050 U 0.050 U 3.71Ferric Iron, Dissolved NA 0.050 U 0.050 U NA NAFerrous Iron 0.050 U 0.050 U 0.050 U 0.050 U 0.050 UFerrous Iron, Dissolved NA 0.050 U 0.050 U NA NANitrate & Nitrite 0.10 U 0.10 U 0.10 U 0.10 U 0.10 U

Metals and Cyanide (mg/l)Arsenic, Dissolved NA 0.0100 U 0.0100 U NA NABarium, Dissolved NA 0.120 0.152 NA NACadmium, Dissolved NA 0.0020 U 0.0020 U NA NAChromium, Dissolved NA 0.0100 U 0.0100 U NA NAIron 0.0500 UJ 0.127 J 0.0500 UJ 0.250 UJ 3.71 JIron, Dissolved NA 0.0500 UJ 0.250 UJ NA NALead, Dissolved NA 0.0050 U 0.0050 U NA NAMagnesium 60.4 58.0 45.9 72.5 52.6Magnesium, Dissolved NA 57.0 46.0 NA NAMercury, Dissolved NA 0.200 U 0.200 U NA NASelenium, Dissolved NA 0.0100 U 0.0100 U NA NASilver, Dissolved NA 0.0050 U 0.0050 U NA NANotes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.3) NA - Not analyzed.



SSI Report

Compound/Analyte DMW09-001 DMW10-001 DMW11-001 DMW12-001 DMW13-001 DMW14-0011/25/02 1/21/02 1/23/02 1/22/02 1/23/02 1/22/02

Alkalinity 390 360 290 350 400 320Sulfate 13 290 41 73 55 76Chloride 130 110 78 35 98 37Ferric Iron 0.340 0.050 U 0.548 1.07 5.92 0.646Ferric Iron, Dissolved NA NA NA 0.611 NA NAFerrous Iron 0.050 U 0.050 U 0.050 U 0.050 0.050 U 0.050Ferrous Iron, Dissolved NA NA NA 0.050 U NA NANitrate & Nitrite 0.10 U 0.83 0.10 U 0.10 U 0.10 U 0.10 U

Metals and Cyanide (mg/l)Arsenic, Dissolved NA NA NA 0.0100 U NA NABarium, Dissolved NA NA NA 0.125 NA NACadmium, Dissolved NA NA NA 0.0020 U NA NAChromium, Dissolved NA NA NA 0.0100 U NA NAIron 0.340 J 0.0500 UJ 0.548 J 1.12 J 5.92 J 0.696 JIron, Dissolved NA NA NA 0.611 J NA NALead, Dissolved NA NA NA 0.0050 U NA NAMagnesium 43.8 62.9 57.1 57.8 57.6 43.2Magnesium, Dissolved NA NA NA 53.5 NA NAMercury, Dissolved NA NA NA 0.200 U NA NASelenium, Dissolved NA NA NA 0.0100 U NA NASilver, Dissolved NA NA NA 0.0050 U NA NANotes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.3) NA - Not analyzed.


Aurora MGP Site




SSI Report


Table 15 Geophysical Analytical Results for Select Soil Samples

Aurora MGP Site

Sample Number

And Depth

Average Hydraulic

Conductivity (cm/sec)

Specific Gravity

Moisture Content

Dry Unit Weight (lb/ft3)

Grain Size Distribution

SB68-001 26-28 feet bgs 3.6 x 10-7 2.754 10.5% 127.5

37.6% Gravel 46.9% Sand 10.9% Silt 4.6% Clay

SB68-002 28-30 feet bgs 2.0 x 10-6 2.781 9.0% 133.3

27.5% Gravel 59.2% Sand

7.5% Silt 5.8% Clay

SB68-003 30-32 feet bgs 3.3 x 10-8 2.754 9.6% 138.2

25.7% Gravel 45.2% Sand 17.9% Silt

11.2% Clay

Notes: 1. bgs – below ground surface 2. cm/sec – centimeters per second 3. lb/ft3 – pounds per cubic foot

FIGURES SUPPLEMENTAL SITE INVESTIGATION

AURORA MGP SITE

APPENDIX A 1993-1994 FOX RIVER SEDIMENT AND WATER COLUMN ANALYTICAL RESULTS

TABLES AND INVESTIGATION ACTIVITIES MAP SUPPLEMENTAL SITE INVESTIGATION

AURORA MGP SITE

Table A-1Fox River Water Column Sample Analytical Results

Aurora MGP Site

Sample Location and Date Sampled/ConcentrationSW1 SW2 SW3

Compound/Analyte 10/6/93 10/6/93 10/6/93BTEX/Styrene (mg/l)

Benzene 0.001 U 0.001 U 0.001 UEthylbenzene 0.001 U 0.001 U 0.001 UToluene 0.001 U 0.001 U 0.001 UXylenes (total) 0.001 U 0.001 U 0.001 UStyrene 0.001 U 0.001 U 0.001 U

Phenols (mg/l)2,4-Dimethylphenol NA NA NA2-Methylphenol NA NA NA4-Methylphenol NA NA NAPhenol NA NA NA

PAHs (mg/l)Acenaphthene 0.010 U 0.010 U 0.010 UAcenaphthylene 0.010 U 0.010 U 0.010 UAnthracene 0.0066 U 0.0066 U 0.0066 UBenzo(a)anthracene 0.00013 U 0.00013 U 0.00013 UBenzo(b)fluoranthene 0.00018 U 0.00018 U 0.00018 UBenzo(k)fluoranthene 0.00017 U 0.00017 U 0.00017 UBenzo(a)pyrene 0.00023 U 0.00023 U 0.00023 UBenzo(g,h,i)perylene 0.00076 U 0.00076 U 0.00076 UChrysene 0.0015 U 0.0015 U 0.0015 UDibenzo(a,h)anthracene 0.00030 U 0.00030 U 0.00030 UFluoranthene 0.0021 U 0.0021 U 0.0021 UFluorene 0.0021 U 0.0021 U 0.0021 UIndeno(1,2,3-cd)pyrene 0.00043 U 0.00043 U 0.00043 UNaphthalene 0.010 U 0.010 U 0.010 UPhenanthrene 0.0064 U 0.0064 U 0.0064 UPyrene 0.0027 U 0.0027 U 0.0027 UDibenzofuran NA NA NA2-Methylnaphthalene NA NA NA

RCRA Metals and Cyanide (mg/l)Arsenic 0.0050 U 0.0050 U 0.0050 UBarium 0.076 0.076 0.074Cadmium 0.003 U 0.004 0.003 UChromium 0.005 U 0.005 U 0.005 ULead 0.0050 0.0075 0.0066Mercury 0.0002 U 0.0002 U 0.0002 USelenium 0.0050 U 0.0050 U 0.0050 USilver 0.040 U 0.040 U 0.040 UCyanide, Total 0.006 0.003 0.002 UNote:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) NA - Not analyzed.

Aurora MGP Site 1 of 1

SSI Report

Table A-2Fox River Sediment Analytical Results

Aurora MGP Site

Sample Location

Compound/Analyte SD1 SD2 SD3 SD4 SD5 SD6

BTEX / Styrene (mg/kg)Benzene 0.002 U 0.002 U 0.002 U 0.0368 0.0248 0.805Ethylbenzene 0.002 U 0.002 U 0.002 U 0.126 0.0097 3.980Toluene 0.0039 0.002 U 0.002 U 0.0065 0.002 U 0.562Xylenes (total) 0.002 U 0.002 U 0.002 U 0.0302 0.002 U 6.650Styrene NA NA NA NA NA NA

Phenols (mg/kg)2,4-Dimethylphenol NA NA NA NA NA NA2-Methylphenol (O-cresol) NA NA NA NA NA NA4-Methylphenol (P-cresol) NA NA NA NA NA NAPhenol NA NA NA NA NA NA

PAHs (mg/kg)Acenaphthene 0.330 U 0.330 U 0.330 U 0.341 0.330 U 0.456Acenaphthylene 0.330 U 0.330 U 0.330 U 0.330 U 0.330 U 0.330 UAnthracene 0.330 U 0.330 U 0.330 U 2.60 0.330 U 0.478Benzo(a)anthracene 0.387 0.061 0.436 5.29 0.704 0.739Benzo(b)fluoranthene 0.193 0.039 0.236 3.83 0.470 0.435Benzo(k)fluoranthene 0.141 0.029 0.183 2.14 0.332 0.286Benzo(a)pyrene 0.305 0.054 0.346 4.22 0.756 0.718Benzo(g,h,i)perylene 0.070 0.051 U 0.132 2.76 0.436 0.406Chrysene 0.257 0.100 U 0.314 4.45 0.463 0.473Dibenzo(a,h)anthracene 0.025 0.020 U 0.032 0.320 0.045 0.056Fluoranthene 0.796 0.330 U 0.942 16.1 1.20 1.53Fluorene 0.140 U 0.140 U 0.145 0.393 0.143 0.374Indeno(1,2,3-cd)pyrene 0.141 0.029 U 0.214 2.55 0.444 0.411Naphthalene 0.330 U 0.330 U 0.330 U 0.330 U 0.665 1.39Phenanthrene 0.702 0.330 U 1.07 10.6 1.03 1.58Pyrene 0.632 0.180 U 0.751 11.7 1.37 1.45Dibenzofuran NA NA NA NA NA NA2-Methylnaphthalene NA NA NA NA NA NA

RCRA Metals and Cyanide (mg/kg)Arsenic 15.0 21.8 10.6 7.66 7.55 5.78Barium 137 90.0 46.2 35.1 64.4 40.9Cadmium 2.21 2.05 0.72 0.65 U 1.15 1.18Chromium 20.5 24.6 13.4 8.8 11.5 16.1Lead 120 33.5 68.1 24.4 63.5 61.1Mercury 0.62 0.18 0.05 0.06 0.09 0.17Selenium 0.80 U 0.80 U 0.80 U 0.80 U 0.80 U 0.80 USilver 3.4 U 2.7 U 2.6 U 2.6 U 3.1 U 2.8 UCyanide 0.17 U 0.14 U 0.13 U 0.58 0.26 0.40

Sediment Quality Parameter (mg/kg)Total Organic Carbon NA NA NA 14,000 14,000 12,000Notes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) NA - Not analyzed.


Table A-2 (Continued)Fox River Sediment Analytical Results

Aurora MGP Site

Sample Location

Compound/Analyte SD7 SD8 SD9 SD10 SD11 SD12

BTEX / Styrene (mg/kg)Benzene 0.127 0.002 U 0.002 U 0.002 U 0.002 U 0.002 UEthylbenzene 1.500 0.002 U 0.002 U 0.002 U 0.002 U 0.002 UToluene 0.07 U 0.002 U 0.002 U 0.002 U 0.002 U 0.002 UXylenes (total) 5.010 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UStyrene NA NA NA NA NA NA

Phenols (mg/kg)2,4-Dimethylphenol NA NA NA NA NA NA2-Methylphenol (O-cresol) NA NA NA NA NA NA4-Methylphenol (P-cresol) NA NA NA NA NA NAPhenol NA NA NA NA NA NA

PAHs (mg/kg)Acenaphthene 1.28 0.330 U 0.330 U 0.330 U 0.330 U 0.330 UAcenaphthylene 0.330 U 0.330 U 0.330 U 0.330 U 0.330 U 0.330 UAnthracene 0.955 0.330 U 0.330 U 0.721 0.330 U 0.330 UBenzo(a)anthracene 1.62 0.456 0.400 1.080 0.176 0.249Benzo(b)fluoranthene 0.889 0.282 0.246 0.435 0.090 0.121Benzo(k)fluoranthene 0.722 0.185 0.178 0.387 0.068 0.100Benzo(a)pyrene 1.63 0.244 0.336 0.740 0.115 0.067Benzo(g,h,i)perylene 1.03 0.296 0.228 0.497 0.107 0.091Chrysene 0.796 0.385 0.353 0.827 0.154 0.439Dibenzo(a,h)anthracene 0.050 U 0.032 0.052 0.0060 U 0.006 U 0.006 UFluoranthene 2.90 0.866 0.932 2.260 0.330 U 0.330 UFluorene 0.610 0.140 U 0.140 U 0.300 0.140 U 0.140 UIndeno(1,2,3-cd)pyrene 0.798 0.210 0.162 0.446 0.074 0.070Naphthalene 2.11 0.036 0.025 U 0.070 0.025 U 0.025 UPhenanthrene 2.33 0.33 U 0.501 2.140 0.330 U 0.330 UPyrene 4.64 0.684 0.692 1.730 0.285 0.180 UDibenzofuran NA NA NA NA NA NA2-Methylnaphthalene NA NA NA NA NA NA

RCRA Metals and Cyanide (mg/kg)Arsenic 8.14 3.7 3.7 3.0 2.0 U 2.0 UBarium 75.7 44.0 50.2 51.5 106 55.8Cadmium 1.06 1.02 1.19 1.19 2.26 1.0 UChromium 10.9 13.1 14.8 15.9 25.5 11.9Lead 128 74.6 79.7 61.0 29.0 17.8Mercury 0.18 0.10 0.12 0.12 0.12 0.04Selenium 0.80 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 USilver 3.0 U 2.0 U 2.0 U 4.5 2.0 U 12.9Cyanide 0.44 2.0 U 2.0 U 2.0 U 2.0 U 2.0 U

Sediment Quality Parameter (mg/kg)Total Organic Carbon 30,000 21,000 24,000 25,000 21,000 17,000Notes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) NA - Not analyzed.



Aurora MGP Site

Sample Location

Compound/Analyte SD13 SD14 SD15 SD16 SD17 (SD18)1

BTEX / Styrene (mg/kg)Benzene 0.002 U 0.002 U 0.002 U 0.002 U 0.002 U 0.25 UEthylbenzene 0.002 U 0.002 U 0.002 U 0.002 U 0.002 U 0.25 UToluene 0.002 U 0.002 U 0.002 U 0.002 U 0.002 U 0.25 UXylenes (total) 0.005 U 0.005 U 0.005 U 0.005 U 0.005 U 0.25 UStyrene NA NA NA NA NA 0.25 U

Phenols (mg/kg)2,4-Dimethylphenol NA NA NA NA NA 0.66 U2-Methylphenol (O-cresol) NA NA NA NA NA 0.66 U4-Methylphenol (P-cresol) NA NA NA NA NA 0.66 UPhenol NA NA NA NA NA 0.66 U

PAHs (mg/kg)Acenaphthene 0.330 U 0.330 U 0.330 U 0.330 U 0.330 U 1.20 UAcenaphthylene 0.330 U 0.330 U 0.330 U 0.330 U 0.330 U 1.54 UAnthracene 0.330 U 0.330 U 0.330 U 0.440 0.330 U 0.440 UBenzo(a)anthracene 0.0603 0.398 0.119 1.770 0.055 0.125Benzo(b)fluoranthene 0.036 0.024 0.061 0.555 0.020 0.012 UBenzo(k)fluoranthene 0.029 0.019 0.047 0.520 0.016 0.011 UBenzo(a)pyrene 0.050 0.034 0.101 1.290 0.034 0.110Benzo(g,h,i)perylene 0.051 U 0.051 U 0.072 0.914 0.051 U 0.111Chrysene 0.050 0.040 0.030 U 1.530 0.050 0.103Dibenzo(a,h)anthracene 0.006 U 0.006 U 0.006 U 0.062 U 0.006 U 0.020 UFluoranthene 0.330 U 0.330 U 0.330 U 2.420 0.330 U 0.140 UFluorene 0.140 U 0.140 U 0.140 U 0.140 U 0.140 U 0.140 UIndeno(1,2,3-cd)pyrene 0.030 0.023 0.062 0.202 0.0086 U 0.095Naphthalene 0.025 U 0.025 U 0.025 U 0.084 0.025 U 1.20 UPhenanthrene 0.330 U 0.330 U 0.330 U 0.430 0.330 U 0.428 UPyrene 0.180 U 0.180 U 0.210 2.730 0.180 U 0.263Dibenzofuran NA NA NA NA NA 0.66 U2-Methylnaphthalene NA NA NA NA NA 0.66 U

RCRA Metals and Cyanide (mg/kg)Arsenic 2.0 U 2.0 U 2.0 U 2.0 U 4.1 4.5Barium 53.3 40 U 80.5 118 67 85Cadmium 1.0 U 1.0 U 2.0 2.70 1.53 1.4Chromium 8.4 10.0 15.2 30.5 20.6 15Lead 32.6 13.0 70.0 33.2 41.6 71 JMercury 0.06 0.05 0.17 0.30 0.45 12 JSelenium 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.7 Silver 2.0 U 2.0 U 2.0 U 2.0 U 2.0 U 1.0 UCyanide 2.0 U 2.0 U 2.0 U 2.0 U 2.0 U 0.10 U

Sediment Quality Parameter (mg/kg)Total Organic Carbon 16,000 19,000 18,000 64,000 72,000 3,800Notes:1) Sample collected during 1995 site investigation activities.2) U - Compound/analyte not detected. The associated numerical value is the reporting limit.3) J - Estimated value.4) NA - Not analyzed.



Aurora MGP Site

Sample Location

Compound/Analyte (SD19)1

BTEX / Styrene (mg/kg)Benzene 0.25 UEthylbenzene 0.25 UToluene 0.25 UXylenes (total) 0.25 UStyrene 0.25 U

Phenols (mg/kg)2,4-Dimethylphenol 0.66 U2-Methylphenol (O-cresol) 0.66 U4-Methylphenol (P-cresol) 0.66 UPhenol 0.66 U

PAHs (mg/kg)Acenaphthene 1.20 UAcenaphthylene 1.54 UAnthracene 0.440 UBenzo(a)anthracene 0.112Benzo(b)fluoranthene 0.085Benzo(k)fluoranthene 0.065Benzo(a)pyrene 0.113Benzo(g,h,i)perylene 0.065Chrysene 0.100 UDibenzo(a,h)anthracene 0.020 UFluoranthene 0.140 UFluorene 0.140 UIndeno(1,2,3-cd)pyrene 0.097Naphthalene 1.20 UPhenanthrene 0.428 UPyrene 0.270Dibenzofuran 0.66 U2-Methylnaphthalene 0.66 U

RCRA Metals and Cyanide (mg/kg)Arsenic 3.6Barium 67Cadmium 0.98Chromium 6.6Lead 520Mercury 0.14Selenium 0.5 Silver 1.0 UCyanide 0.10 U

Sediment Quality Parameter (mg/kg)Total Organic Carbon 2,800Notes:1) Sample collected during 1995 site investigation activities.2) U - Compound/analyte not detected. The associated numerical value is the reporting limit.


APPENDIX B 1995-1996 SITE INVESTIGATION ANALYTICAL RESULTS TABLES

AND INVESTIGATION ACTIVITIES MAPS SUPPLEMENTAL SITE INVESTIGATION

AURORA MGP SITE

Table B-1 SI Surface Soil Analytical Results*

Aurora MGP Site

Sample Location and Depth (feet below ground surface)/ConcentrationSS01-001 SS02-001 SS03-001 SS04-001 SS05-001 AB01-001

Compound/Analyte 0-0.5 0-0.5 0-0.5 0-0.5 0-0.5 0-2BTEX / Styrene (mg/kg)


Phenols (mg/kg)2,4-Dimethylphenol 0.66 U 0.66 U 0.66 U 3.3 UJ 6.6 UJ NA2-Methylphenol (O-cresol) 0.66 U 0.66 U 0.66 U 3.3 UJ 6.6 UJ NA4-Methylphenol (P-cresol) 0.66 U 0.66 U 0.66 U 3.3 UJ 6.6 UJ NAPhenol 0.66 U 0.66 U 0.66 U 3.3 UJ 6.6 UJ NA

PAHs (mg/kg)Acenaphthene 1.20 U 1.20 U 1.20 U 1.20 UJ 1.20 UJ NAAcenaphthylene 1.54 U 1.54 U 1.54 U 1.54 UJ 1.54 UJ NAAnthracene 0.440 U 0.440 U 0.440 U 4.3 J 0.440 UJ NABenzo(a)anthracene 0.264 0.070 0.190 7.8 J 0.303 J NABenzo(b)fluoranthene 0.198 0.051 0.110 7.4 J 0.133 J NABenzo(k)fluoranthene 0.132 0.030 0.068 5.1 J 0.216 J NABenzo(a)pyrene 0.330 0.095 0.220 10.0 J 0.258 J NABenzo(g,h,i)perylene 0.330 0.098 0.200 5.3 J 0.124 J NAChrysene 0.317 0.100 U 0.160 7.2 J 0.254 J NADibenzo(a,h)anthracene 0.264 0.034 0.033 1.3 J 0.032 J NAFluoranthene 0.818 0.210 0.570 16.4 J 0.388 J NAFluorene 0.140 U 0.140 U 0.140 U 2.2 J 0.059 J NAIndeno(1,2,3-cd)pyrene 0.237 0.067 0.150 4.5 J 0.102 J NANaphthalene 0.858 U 1.20 U 1.20 U 1.9 J 1.20 UJ NAPhenanthrene 0.369 0.428 U 0.428 U 0.428 UJ 0.428 UJ NAPyrene 0.725 0.180 U 0.380 16.8 J 0.372 J NADibenzofuran 0.66 U 0.66 U 0.66 U 3.3 UJ 6.6 UJ NA2-Methylnaphthalene 0.66 U 0.66 U 0.66 U 3.3 UJ 6.6 UJ NA

RCRA Metals and Cyanide (mg/kg)Arsenic 5.7 4.4 8.0 8.6 16 NABarium 86 78 107 58 75 NACadmium 3.1 1.6 2.2 0.4 U 0.4 U NAChromium 25 12 20 0.7 U 0.7 U NALead 110 59 120 210 160 NAMercury 0.15 0.09 0.05 3.5 1.7 NASelenium 0.48 U 0.48 U 0.48 U 7.5 U 7.5 U NASilver 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U NACyanide 0.10 UJ 0.10 UJ 0.10 UJ 0.98 16.8 NANotes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.3) NA - Not analyzed.4) * - Soil boring samples collected within the top two feet of soil are included on this table.


Table B-1 (Continued) SI Surface Soil Analytical Results*

Aurora MGP Site

Sample Location and Depth (feet below ground surface)/ConcentrationSB01a-001 SB02-001 SB03-001 SB04-001 SB06-001 SB07-001

Compound/Analyte 0-2 0-2 0-2 0-2 0-2 0-2BTEX / Styrene (mg/kg)

Benzene 0.25 U 0.25 U 0.25 U 0.25 U 0.25 UJ 0.25 UEthylbenzene 0.25 U 0.25 U 0.25 U 0.25 U 0.25 UJ 0.25 UToluene 0.25 U 0.25 U 0.25 U 0.25 U 0.25 UJ 0.25 UXylenes (total) 0.25 U 0.25 U 0.25 U 0.25 U 0.25 UJ 0.25 UStyrene 0.25 U 0.25 U 0.25 U 0.25 U 0.25 UJ 0.25 U

Phenols (mg/kg)2,4-Dimethylphenol 3.3 UJ 0.66 U 1.3 U 0.66 U 0.66 U 13 UJ2-Methylphenol (O-cresol) 3.3 UJ 0.66 U 1.3 U 0.66 U 0.66 U 13 UJ4-Methylphenol (P-cresol) 3.3 UJ 0.66 U 1.3 U 0.67 0.66 U 13 UJPhenol 3.3 UJ 0.66 U 1.3 U 0.66 U 0.66 U 13 UJ

PAHs (mg/kg)Acenaphthene 1.20 UJ 1.20 U 1.3 U 1.20 UJ 1.2 UJ 83.0 JAcenaphthylene 1.54 UJ 1.54 U 1.3 UJ 1.54 UJ 1.54 UJ 169 JAnthracene 0.440 UJ 0.440 U 1.3 U 2.63 J 0.44 UJ 46 JBenzo(a)anthracene 1.7 J 0.018 0.35 J 12.3 J 0.464 J 43 JBenzo(b)fluoranthene 2.4 J 0.013 0.56 J 8.23 J 0.422 J 9.5 JBenzo(k)fluoranthene 1.1 J 0.011 U 0.37 J 5.47 J 0.254 J 6.7 JBenzo(a)pyrene 1.4 J 0.015 0.60 J 10.1 J 0.471 J 27 JBenzo(g,h,i)perylene 0.557 J 0.051 U 0.61 J 7.19 J 0.351 J 16 JChrysene 2.0 J 0.100 U 0.39 J 9.16 J 0.476 J 24 JDibenzo(a,h)anthracene 0.135 J 0.020 U 0.30 J 0.820 UJ 0.049 J 0.610 JFluoranthene 57.70 J 0.140 U 0.74 J 15.5 J 0.726 J 84 JFluorene 0.986 J 0.140 U 1.3 UJ 0.820 UJ 0.140 UJ 107 JIndeno(1,2,3-cd)pyrene 0.541 J 0.028 U 0.56 J 6.00 J 0.289 J 11 JNaphthalene 3.0 J 1.20 U 1.3 UJ 3.67 J 1.20 UJ 243 JPhenanthrene 0.428 UJ 0.428 U 1.3 UJ 4.98 J 0.428 UJ 166 JPyrene 3.0 J 0.180 U 0.58 J 16.5 J 0.736 J 70 JDibenzofuran 3.3 UJ 0.66 U 1.3 U 0.66 U 0.66 U 15 J2-Methylnaphthalene 3.3 UJ 0.66 U 1.3 U 0.66 U 0.66 U 77 J

RCRA Metals and Cyanide (mg/kg)Arsenic NA 1.53 41 11.2 1.22 24Barium NA 2.6 100 100 13 92Cadmium NA 0.40 U 1.6 0.40 U 0.40 U 4.1Chromium NA 2.0 11 8.5 0.7 U 26Lead NA 4.2 U 120 100 25 49Mercury NA 0.02 U 4.3 0.22 0.59 0.16Selenium NA 7.5 U 7.5 U 7.5 U 7.5 U 7.5 USilver NA 3.1 3.0 1.0 U 1.0 U 1.0 UCyanide NA 0.10 U 0.10 U 4.89 0.30 1.4Notes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.3) NA - Not analyzed.4) * - Soil boring samples collected within the top two feet of soil are included on this table.



Aurora MGP Site

Sample Location and Depth (feet below ground surface)/ConcentrationSB08-001 SB09-001 SB10-001 SB11-001 SB12-001 SB13-001



Phenols (mg/kg)2,4-Dimethylphenol 0.66 U 6.6 UJ 0.66 U 0.66 U 0.66 U 0.66 U2-Methylphenol (O-cresol) 0.66 U 6.6 UJ 0.66 U 0.66 U 0.66 U 0.66 U4-Methylphenol (P-cresol) 0.66 U 6.6 UJ 0.66 U 0.66 U 0.66 U 0.66 UPhenol 0.66 U 6.6 UJ 0.66 U 0.66 U 0.66 U 0.66 U

PAHs (mg/kg)Acenaphthene 1.20 UJ 6.6 UJ 1.20 U 2.05 J 0.33 U 2.7Acenaphthylene 1.54 UJ 26 J 1.54 U 1.54 UJ 5.1 5 JAnthracene 0.440 UJ 3.7 J 0.440 U 0.566 J 2.3 6.9 JBenzo(a)anthracene 0.948 J 2.9 J 0.707 2.17 J 3.6 13 JBenzo(b)fluoranthene 0.836 J 7.0 J 0.443 1.44 J 5 6.7 JBenzo(k)fluoranthene 0.542 J 6.3 J 0.380 1.20 J 4.9 9 JBenzo(a)pyrene 0.997 J 4.6 J 0.992 2.89 J 3.6 8.2 JBenzo(g,h,i)perylene 0.690 J 5.3 J 1.37 3.61 J 36 2.4Chrysene 0.838 J 3.4 J 0.759 2.17 J 3.9 12 JDibenzo(a,h)anthracene 0.122 J 2.3 J 1.00 1.56 J 1.3 0.74Fluoranthene 1.9 J 3.0 J 1.37 3.97 J 4.5 16 JFluorene 0.140 UJ 1.1 J 0.140 U 0.313 J 0.3 J 2.9Indeno(1,2,3-cd)pyrene 0.641 J 5.2 J 0.812 2.17 J 5.6 2.4Naphthalene 1.20 UJ 1.9 J 1.16 1.92 J 0.33 U 2.1Phenanthrene 1.1 J 2.0 J 0.464 1.56 J 1.5 18 JPyrene 1.8 J 5.1 J 1.26 3.73 J 16 22 JDibenzofuran 0.66 U 6.6 UJ 0.66 U 0.66 U 0.66 U 0.672-Methylnaphthalene 0.66 U 6.6 UJ 0.66 U 0.66 U 0.66 U 1.4

RCRA Metals and Cyanide (mg/kg)Arsenic 52 18 2.4 18 4.5 13Barium 143 78 5.9 50 20 38Cadmium 0.40 U 0.4 U 0.40 U 1.1 0.40 U 1.2Chromium 0.7 U 0.7 U 3.3 11 0.70 U 6.4Lead 29 109 18 62 40 88Mercury 3.8 4.1 0.32 0.29 0.06 0.38Selenium 7.5 U 7.5 U 0.48 U 0.48 U 7.5 U 7.5 USilver 1.0 U 1.0 U 1.0 U 1.0 U 3.9 1.0 UCyanide 0.50 8.2 0.10 UJ 1.6 J 5.48 0.81Notes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.3) * - Soil boring samples collected within the top two feet of soil are included on this table.



Aurora MGP Site

Sample Location and Depth (feet below ground surface)/ConcentrationSB14-001 SB15-001 SB16a-001 SB17a-001 SB19-001 SB20-001



Phenols (mg/kg)2,4-Dimethylphenol 0.66 U 6.6 UJ 6.6 UJ 6.6 UJ 3.3 UJ 6.6 UJ2-Methylphenol (O-cresol) 0.66 U 6.6 UJ 6.6 UJ 6.6 UJ 3.3 UJ 6.6 UJ4-Methylphenol (P-cresol) 0.66 U 6.6 UJ 6.6 UJ 6.6 UJ 3.3 UJ 6.6 UJPhenol 0.66 U 6.6 UJ 6.6 UJ 6.6 UJ 3.3 UJ 6.6 UJ

PAHs (mg/kg)Acenaphthene 0.22 J 2 UJ 1.20 UJ 1.20 UJ 1.20 UJ 1.0 UJAcenaphthylene 7.3 J 4 UJ 1.54 UJ 1.54 UJ 1.54 UJ 1.54 UJAnthracene 1.9 1.32 J 0.440 UJ 0.440 UJ 0.497 J 0.440 UJBenzo(a)anthracene 3.8 32.0 J 0.640 J 1.10 J 1.93 J 0.193 JBenzo(b)fluoranthene 6.0 8.16 J 0.480 J 1.40 J 1.79 J 0.932 JBenzo(k)fluoranthene 4.3 7.17 J 0.180 J 1.00 J 1.18 J 0.113 JBenzo(a)pyrene 6.6 11.0 J 0.840 J 1.40 J 2.18 J 0.803 JBenzo(g,h,i)perylene 0.22 J 18.7 J 0.950 J 1.40 J 1.33 J 0.318 JChrysene 4.1 29.8 J 0.450 J 1.00 J 1.30 J 0.180 JDibenzo(a,h)anthracene 2.3 0.20 UJ 0.077 J 0.279 J 0.237 J 0.036 JFluoranthene 3.7 J 111 J 1.4 J 1.30 J 2.67 J 0.529 JFluorene 0.83 17.6 J 0.180 J 0.140 UJ 0.367 J 0.140 UJIndeno(1,2,3-cd)pyrene 0.22 J 9.92 J 0.620 J 1.10 J 1.67 J 0.270 JNaphthalene 1.6 J 290 J 1.3 J 1.20 UJ 1.20 UJ 1.20 UJPhenanthrene 1.7 15.4 J 0.600 J 0.567 J 1.31 J 0.579 JPyrene 6.6 43.0 J 1.0 J 1.5 J 2.28 J 0.604 JDibenzofuran 0.66 U 6.6 UJ 6.6 UJ 6.6 UJ 3.3 UJ 6.6 UJ2-Methylnaphthalene 0.68 6.6 UJ 6.6 UJ 6.6 UJ 3.3 UJ 6.6 UJ

RCRA Metals and Cyanide (mg/kg)Arsenic 5.8 3.9 88 132 5.5 13Barium 37 5.4 41 110 230 260Cadmium 0.4 U 0.40 U 2.9 4.2 3.7 2.2Chromium 0.7 U 2.8 4.9 8.6 53 43Lead 67 36 37 95 300 77Mercury 3.5 0.26 0.08 0.32 0.33 0.04Selenium 7.5 U 0.48 U 7.5 U 7.5 U 0.48 U 0.53 Silver 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 UCyanide 5.0 34 J 0.81 0.10 U 0.50 J 0.10 UNotes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.3) * - Soil boring samples collected within the top two feet of soil are included on this table.



Aurora MGP Site

Sample Location and Depth (feet below ground surface)/ConcentrationSB21-001 SB24-001 SB25-001 SB26-001 SB27a-001 SB28a-001



Phenols (mg/kg)2,4-Dimethylphenol 6.6 UJ 6.6 UJ 0.66 U 0.66 U 6.6 UJ 0.66 U2-Methylphenol (O-cresol) 6.6 UJ 6.6 UJ 0.66 U 0.66 U 6.6 UJ 0.66 U4-Methylphenol (P-cresol) 6.6 UJ 6.6 UJ 0.66 U 0.66 U 6.6 UJ 0.66 UPhenol 6.6 UJ 6.6 UJ 0.66 U 0.66 U 6.6 UJ 0.66 U

PAHs (mg/kg)Acenaphthene 1.20 UJ 1.20 UJ 1.20 U 1.20 UJ 4.60 J 1.20 UAcenaphthylene 1.54 UJ 1.54 UJ 1.54 UR 1.54 UJ 4.0 UJ 1.54 UAnthracene 1.18 J 1.6 J 0.440 U 1.1 J 0.835 J 0.440 UBenzo(a)anthracene 1.07 J 2.3 J 0.18 J 2.5 J 1.33 J 0.050Benzo(b)fluoranthene 3.79 J 1.8 J 0.24 2.4 J 0.787 J 0.041Benzo(k)fluoranthene 3.21 J 1.1 J 0.22 1.2 J 0.508 J 0.022Benzo(a)pyrene 9.15 J 2.5 J 0.18 3.4 J 1.33 J 0.048Benzo(g,h,i)perylene 2.40 J 1.5 J 0.100 U 1.7 J 1.09 J 0.052Chrysene 1.04 J 2.9 J 0.19 J 2.4 J 1.33 J 0.100 UDibenzo(a,h)anthracene 0.520 J 0.268 J 0.060 U 0.207 J 0.981 J 0.020 UFluoranthene 2.69 J 3.9 J 0.34 J 5.2 J 5.45 J 0.140 UFluorene 0.140 UJ 2.1 UJ 0.140 U 0.472 J 0.908 J 0.140 UIndeno(1,2,3-cd)pyrene 6.29 J 1.3 J 0.06 J 1.5 J 0.751 J 0.073Naphthalene 2.36 J 1.20 UJ 1.20 UR 1.20 UJ 4.84 J 1.20 UPhenanthrene 1.68 J 2.9 J 0.428 U 0.428 UJ 2.90 J 0.428 UPyrene 3.48 J 3.7 J 0.34 5.5 J 3.63 J 0.180 UDibenzofuran 6.6 UJ 6.6 UJ 0.66 U 0.66 U 6.6 UJ 0.66 U2-Methylnaphthalene 6.6 UJ 6.6 UJ 0.66 U 0.66 U 6.6 UJ 0.66 U

RCRA Metals and Cyanide (mg/kg)Arsenic 28 9.8 NA 6.0 190 5.7Barium 250 84 NA 43 140 125Cadmium 2.0 0.4 U NA 0.40 U 3.4 0.40 UChromium 27 0.7 U NA 0.7 U 5.2 7.4Lead 74 76 NA 110 110 J 41Mercury 0.19 3.2 NA 0.04 0.38 0.02 USelenium 0.48 U 7.5 U NA 7.5 U 0.48 U 0.48 USilver 1.0 U 1.0 U NA 1.0 U 1.0 U 1.0 UCyanide 0.81 0.10 U NA 0.10 U 0.39 J 0.10 UNotes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.3) NA - Not analyzed.4) * - Soil boring samples collected within the top two feet of soil are included on this table.



Aurora MGP Site

Sample Location and Depth (feet below ground surface)/ConcentrationSB29a-001 SB30a-001 SB31-001 SB32-001

Compound/Analyte 0-2 0-2 0-2 0-2BTEX / Styrene (mg/kg)

Benzene 0.25 U 0.25 U 0.25 UJ 0.25 UEthylbenzene 0.25 U 0.25 U 0.25 UJ 0.25 UToluene 0.25 U 0.25 U 0.25 UJ 0.25 UXylenes (total) 0.25 U 0.25 U 0.25 UJ 0.25 UStyrene 0.25 U 0.25 U 0.25 UJ 0.25 U

Phenols (mg/kg)2,4-Dimethylphenol 3.3 UJ 0.66 U 3.3 UJ 3.3 UJ2-Methylphenol (O-cresol) 3.3 UJ 0.66 U 3.3 UJ 3.3 UJ4-Methylphenol (P-cresol) 3.3 UJ 0.66 U 3.3 UJ 3.3 UJPhenol 3.3 UJ 0.66 U 3.3 UJ 3.3 UJ

PAHs (mg/kg)Acenaphthene 1.2 U 1.20 U 1.20 UJ 1.20 UJAcenaphthylene 1.54 U 1.54 U 1.54 UJ 1.54 UJAnthracene 0.440 U 0.440 U 0.473 J 0.440 UJBenzo(a)anthracene 0.047 0.035 0.500 J 0.595 JBenzo(b)fluoranthene 0.047 0.034 0.012 UJ 0.466 JBenzo(k)fluoranthene 0.033 0.025 0.011 UJ 0.292 JBenzo(a)pyrene 0.059 0.091 0.683 J 0.427 JBenzo(g,h,i)perylene 0.053 0.051 U 0.586 J 0.343 JChrysene 0.188 0.100 U 0.530 J 0.58 JDibenzo(a,h)anthracene 0.020 U 0.020 U 0.020 UJ 0.144 JFluoranthene 0.140 U 0.140 U 1.230 J 1.60 JFluorene 0.140 U 0.228 0.140 UJ 0.258 JIndeno(1,2,3-cd)pyrene 0.064 0.028 U 0.028 UJ 0.275 JNaphthalene 1.20 U 1.20 U 1.20 UJ 1.20 UJPhenanthrene 0.428 U 0.428 U 0.814 J 0.871 JPyrene 0.180 U 1.06 0.86 J 1.09 JDibenzofuran 3.3 UJ 0.66 U 3.3 UJ 3.3 UJ2-Methylnaphthalene 3.3 UJ 0.66 U 3.3 UJ 3.3 UJ

RCRA Metals and Cyanide (mg/kg)Arsenic 6.6 17 6.5 1.7Barium 120 120 270 J 32Cadmium 0.87 1.4 6.6 0.40 UChromium 12 12 83 9.4Lead 140 120 280 33Mercury 0.15 0.04 0.73 J 0.43Selenium 0.55 0.48 U 7.5 U 7.5 USilver 1.0 U 1.0 U 1.4 J 1.0 UCyanide 0.16 0.10 U 0.45 0.10 UNotes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.3) * - Soil boring samples collected within the top two feet of soil are included on this table.


Table B-2SI Subsurface Soil Analytical Results

Aurora MGP Site

Sample Location and Depth (feet below ground surface)/ConcentrationAB01-004 AB01-005 AB01-002 AB01-006 AB01-007 AB01-003


Benzene 0.25 U 0.25 U 0.25 U 1.4 0.25 U 0.52Ethylbenzene 0.25 U 0.25 U 0.25 U 6.2 3.2 8.6Toluene 0.25 U 0.25 U 0.25 U 9.8 0.25 U 0.42 Xylenes (total) 0.25 U 0.25 U 0.86 44 3.3 6.9Styrene 0.25 U 0.25 U 0.25 U 0.35 U 0.25 U 0.25 U

Phenols (mg/kg)2,4-Dimethylphenol 6.6 UJ NA NA NA NA 6.6 UJ2-Methylphenol (O-cresol) 6.6 UJ NA NA NA NA 6.6 UJ4-Methylphenol (P-cresol) 6.6 UJ NA NA NA NA 6.6 UJPhenol 6.6 UJ NA NA NA NA 6.6 UJ

PAHs (mg/kg)Acenaphthene 1.6 UJ NA NA NA NA 52 JAcenaphthylene 5.9 J NA NA NA NA 43 JAnthracene 1.6 UJ NA NA NA NA 50 JBenzo(a)anthracene 42.4 J NA NA NA NA 32 JBenzo(b)fluoranthene 60.8 J NA NA NA NA 28 JBenzo(k)fluoranthene 44.8 J NA NA NA NA 26 JBenzo(a)pyrene 51.9 J NA NA NA NA 32 JBenzo(g,h,i)perylene 118 J NA NA NA NA 6.6 UJChrysene 29.5 J NA NA NA NA 30 JDibenzo(a,h)anthracene 13.5 J NA NA NA NA 3.6 JFluoranthene 48.2 J NA NA NA NA 69 JFluorene 1.6 UJ NA NA NA NA 44 JIndeno(1,2,3-cd)pyrene 80.4 J NA NA NA NA 6.6 UJNaphthalene 8.3 J NA NA NA NA 84 JPhenanthrene 17.5 J NA NA NA NA 108 JPyrene 70.1 J NA NA NA NA 53 JDibenzofuran 6.6 UJ NA NA NA NA 19 J2-Methylnaphthalene 6.6 UJ NA NA NA NA 15 J

RCRA Metals and Cyanide (mg/kg)Arsenic NA NA NA NA NA NABarium NA NA NA NA NA NACadmium NA NA NA NA NA NAChromium NA NA NA NA NA NALead NA NA NA NA NA NAMercury NA NA NA NA NA NASelenium NA NA NA NA NA NASilver NA NA NA NA NA NACyanide NA NA NA NA NA NANotes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.3) NA - Not analyzed.


Table B-2 (Continued)SI Subsurface Soil Analytical Results

Aurora MGP Site

Sample Location and Depth (feet below ground surface)/ConcentrationHA01-001 HA02-001 HA03-001 HA04-001 SB01a-002 SB01a-003

Compound/Analyte 3-7.5 3-5 2-7 0-6 2-4 8-10BTEX / Styrene (mg/kg)

Benzene 0.97 0.25 U 0.25 U 0.25 U NA 0.25 UEthylbenzene 2.9 0.25 U 0.25 U 0.25 U NA 0.25 UToluene 0.76 0.25 U 0.25 U 0.25 U NA 0.25 UXylenes (total) 6.3 0.25 U 0.25 U 0.25 U NA 0.25 UStyrene 0.35 U 0.25 U 0.25 U 0.25 U NA 0.25 U

Phenols (mg/kg)2,4-Dimethylphenol 17 UJ 17 UJ 13 UJ 6.6 UJ NA 0.66 U2-Methylphenol (O-cresol) 17 UJ 17 UJ 13 UJ 6.6 UJ NA 0.66 U4-Methylphenol (P-cresol) 17 UJ 17 UJ 13 UJ 6.6 UJ NA 0.66 UPhenol 17 UJ 17 UJ 13 UJ 6.6 UJ NA 0.66 U

PAHs (mg/kg)Acenaphthene 114 J 6.08 J 1.2 UJ 1.2 UJ NA 1.20 UAcenaphthylene 49.3 J 1.54 UJ 4.2 J 1.54 UJ NA 1.54 UAnthracene 717 J 11.3 J 20.7 J 0.44 UJ NA 0.440 UBenzo(a)anthracene 97.5 J 15.3 J 27.9 J 7.3 J NA 0.022Benzo(b)fluoranthene 35.6 J 6.84 J 18.2 J 5.7 J NA 0.014Benzo(k)fluoranthene 30.9 J 6.80 J 12.8 J 3.7 J NA 0.011Benzo(a)pyrene 78.4 J 14.4 J 26.7 J 1.4 J NA 0.018Benzo(g,h,i)perylene 4.87 J 8.41 J 18.4 J 1.8 J NA 0.051 UChrysene 68.7 J 10.5 J 19.1 J 7.1 J NA 0.100 UDibenzo(a,h)anthracene 5.21 J 0.905 J 2.6 J 0.613 J NA 0.020 UFluoranthene 853 J 24.9 J 45.7 J 6.7 J NA 0.140 UFluorene 157 J 4.87 J 1.2 UJ 2.5 J NA 0.140 UIndeno(1,2,3-cd)pyrene 36.9 J 6.63 J 18.1 J 2.5 J NA 0.028 UNaphthalene 1950 J 6.26 J 12.9 J 2.2 J NA 1.20 UPhenanthrene 1470 J 17.5 J 21 J 5 J NA 0.428 UPyrene 934 J 28.5 J 53 J 8 J NA 0.180 UDibenzofuran 22 J 17 UJ 13 UJ 6.6 UJ NA 0.66 U2-Methylnaphthalene 370 J 17 UJ 13 UJ 6.6 UJ NA 0.66 U

RCRA Metals and Cyanide (mg/kg)Arsenic 7.84 7.48 NA 4.5 62 3.7Barium 75.1 32.0 NA 62 35 17Cadmium 0.4 U 0.4 U NA 0.4 U 0.4 U 0.40 UChromium 0.7 U 0.7 U NA 3.2 0.7 U 0.7 ULead 100 86 NA 80 31 5.1Mercury 0.25 0.28 NA 0.58 0.12 0.02 USelenium 7.5 U 7.5 U NA 7.5 U 7.5 U 7.5 USilver 1.0 U 1.0 U NA 1.0 U 1.0 U 1.0 UCyanide 0.90 1.4 NA 155 0.10 U 0.10 UNotes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.3) NA - Not analyzed.



Aurora MGP Site

Sample Location and Depth (feet below ground surface)/ConcentrationSB01a-005 SB01a-004 SB02-002 SB02-003 SB02-004 SB02-005



Phenols (mg/kg)2,4-Dimethylphenol 0.66 U 0.66 U 0.66 U NA NA NA2-Methylphenol (O-cresol) 0.66 U 0.66 U 0.66 U NA NA NA4-Methylphenol (P-cresol) 0.66 U 0.66 U 0.66 U NA NA NAPhenol 0.66 U 0.66 U 0.66 U NA NA NA

PAHs (mg/kg)Acenaphthene 1.20 U 1.20 U 1.20 U NA NA NAAcenaphthylene 1.54 U 1.54 U 1.54 U NA NA NAAnthracene 0.440 U 0.440 U 0.440 U NA NA NABenzo(a)anthracene 0.0087 U 0.0087 U 0.015 NA NA NABenzo(b)fluoranthene 0.012 U 0.012 U 0.012 U NA NA NABenzo(k)fluoranthene 0.011 U 0.011 U 0.011 U NA NA NABenzo(a)pyrene 0.015 U 0.015 U 0.015 U NA NA NABenzo(g,h,i)perylene 0.051 U 0.051 U 0.051 U NA NA NAChrysene 0.100 U 0.100 U 0.100 U NA NA NADibenzo(a,h)anthracene 0.020 U 0.020 U 0.020 U NA NA NAFluoranthene 0.140 U 0.140 U 0.140 U NA NA NAFluorene 0.140 U 0.140 U 0.140 U NA NA NAIndeno(1,2,3-cd)pyrene 0.028 U 0.028 U 0.028 U NA NA NANaphthalene 1.20 U 1.20 U 1.20 U NA NA NAPhenanthrene 0.428 U 0.428 U 0.428 U NA NA NAPyrene 0.180 U 0.180 U 0.180 U NA NA NADibenzofuran 0.66 U 0.66 U 0.66 U NA NA NA2-Methylnaphthalene 0.66 U 0.66 U 0.66 U NA NA NA

RCRA Metals and Cyanide (mg/kg)Arsenic 1.4 2.7 3.23 NA NA NABarium 14 11 33 NA NA NACadmium 0.40 U 0.40 U 0.4 U NA NA NAChromium 2.9 3.3 5.3 NA NA NALead 4.2 U 4.8 8.1 NA NA NAMercury 0.02 U 0.02 0.02 U NA NA NASelenium 7.5 U 7.5 U 7.5 U NA NA NASilver 1.0 U 1.0 U 2.9 NA NA NACyanide 0.10 U 0.10 U 0.10 U NA NA NANotes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.3) NA - Not analyzed.



Aurora MGP Site

Sample Location and Depth (feet below ground surface)/ConcentrationSB02-006 SB03-002 SB04-002 SB04-003 SB05a-001 SB05a-002



Phenols (mg/kg)2,4-Dimethylphenol 0.66 U 0.66 U 0.66 U 0.66 U 3.3 UJ 0.66 U2-Methylphenol (O-cresol) 0.66 U 0.66 U 0.66 U 0.66 U 3.3 UJ 0.66 U4-Methylphenol (P-cresol) 0.66 U 0.66 U 0.66 U 0.66 U 3.3 UJ 0.66 UPhenol 0.66 U 0.66 U 0.66 U 0.66 U 3.3 UJ 0.66 U

PAHs (mg/kg)Acenaphthene 1.20 U 1.20 U 1.20 UJ 1.20 U 1.2 U 1.2 UJAcenaphthylene 1.54 U 1.54 U 1.54 UJ 1.54 U 1.54 U 1.54 UJAnthracene 0.440 U 0.440 U 1.41 J 0.440 U 0.44 U 0.44 UJBenzo(a)anthracene 0.0087 U 0.0087 U 5.15 J 0.0087 U 0.009 U 2 JBenzo(b)fluoranthene 0.012 U 0.012 U 4.96 J 0.012 U 0.012 U 0.849 JBenzo(k)fluoranthene 0.011 U 0.011 U 2.32 J 0.011 U 0.011 U 0.415 JBenzo(a)pyrene 0.015 U 0.015 U 3.92 J 0.015 U 0.044 U 0.929 JBenzo(g,h,i)perylene 0.051 U 0.051 U 2.52 J 0.051 U 0.051 U 0.366 JChrysene 0.100 U 0.100 U 3.81 J 0.100 U 0.1 U 1.5 JDibenzo(a,h)anthracene 0.020 U 0.020 U 0.400 UJ 0.020 U 0.02 U 0.083 JFluoranthene 0.140 U 0.140 U 7.32 J 0.140 U 0.14 U 4.1 JFluorene 0.140 U 0.140 U 0.400 UJ 0.140 U 1.08 0.997 JIndeno(1,2,3-cd)pyrene 0.028 U 0.028 U 2.84 J 0.028 U 0.028 U 0.419 JNaphthalene 1.20 U 1.20 U 1.20 J 1.20 U 1.20 U 1.2 UJPhenanthrene 0.428 U 0.428 U 2.99 J 0.428 U 0.428 U 2 JPyrene 0.180 U 0.180 U 7.20 J 0.180 U 0.18 U 2.1 JDibenzofuran 0.66 U 0.66 U 0.66 UJ 0.66 U 3.3 UJ 0.66 U2-Methylnaphthalene 0.66 U 0.66 U 0.66 UJ 0.66 U 3.3 UJ 0.66 U

RCRA Metals and Cyanide (mg/kg)Arsenic 1.47 J 2.05 8.31 2.3 3.9 2.5Barium 4.9 16 53 21 8.4 11Cadmium 0.40 U 0.40 U 0.40 U 0.40 U 0.4 U 0.4 UChromium 0.70 U 4.8 8.2 0.70 U 2.8 3Lead 4.2 U 14 95 4.2 U 5.1 5.2Mercury 0.02 U 0.04 0.09 0.02 U 0.02 0.03Selenium 7.5 U 7.5 U 7.5 U 7.5 U 7.5 U 7.5 USilver 3.3 3.9 1.0 U 3.0 1 U 1 UCyanide 0.10 U 0.10 U 6.64 0.10 U 0.1 U 0.1 UNotes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.



Aurora MGP Site



Benzene NA 0.25 U 0.25 U 110 NA 0.25 UEthylbenzene NA 0.25 U 0.25 U 19 NA 0.25 UToluene NA 0.25 U 0.25 U 150 NA 0.25 UXylenes (total) NA 0.25 U 0.25 U 110 NA 0.25 UStyrene NA 0.25 U 0.25 U 120 NA 0.25 U

Phenols (mg/kg)2,4-Dimethylphenol 0.66 U NA 0.66 U 200 UJ NA 3.3 UJ2-Methylphenol (O-cresol) 0.66 U NA 0.66 U 200 UJ NA 3.3 UJ4-Methylphenol (P-cresol) 0.66 U NA 0.66 U 200 UJ NA 3.3 UJPhenol 0.66 U NA 0.66 U 200 UJ NA 3.3 UJ

PAHs (mg/kg)Acenaphthene 1.2 UJ NA 1.2 U 317 J 92 J 4.2 JAcenaphthylene 1.54 UJ NA 1.54 U 943 J 92 J 2.6 JAnthracene 0.44 UJ NA 0.44 U 94 J 664 J 10.3 JBenzo(a)anthracene 0.521 J NA 0.0087 U 91 J 58 J 11.2 JBenzo(b)fluoranthene 0.419 J NA 0.012 U 20 J 8.8 J 7.7 JBenzo(k)fluoranthene 0.254 J NA 0.011 U 14 J 6.0 J 5.6 JBenzo(a)pyrene 0.518 J NA 0.015 U 63 J 25 J 9.7 JBenzo(g,h,i)perylene 0.337 J NA 0.051 U 42 J 14 J 5.3 JChrysene 0.921 J NA 0.1 U 51 J 25 J 10.7 JDibenzo(a,h)anthracene 0.049 J NA 0.02 U 2.0 J 10 J 1.1 JFluoranthene 0.886 J NA 0.14 U 307 J 152 J 33.2 JFluorene 0.14 UJ NA 0.14 U 449 J 234 J 5.9 JIndeno(1,2,3-cd)pyrene 0.325 J NA 0.028 U 26 J 13 J 4.9 JNaphthalene 1.2 UJ NA 1.2 U 1640 J 860 J 7.6 JPhenanthrene 0.494 J NA 0.428 U 409 J 235 J 27.3 JPyrene 0.82 J NA 0.18 U 185 J 72 J 28.4 JDibenzofuran 0.66 U NA 0.66 U 200 UJ 66 UJ 3.3 UJ2-Methylnaphthalene 0.66 U NA 0.66 U 800 J 260 J 3.3 UJ

RCRA Metals and Cyanide (mg/kg)Arsenic 6 NA 4.4 32 NA 4.7Barium 54 NA 8.2 87 NA 78Cadmium 0.4 U NA 0.4 U 3.7 NA 0.4 UChromium 0.7 U NA 0.7 U 27 NA 0.7 ULead 43 NA 4.2 U 92 NA 1100Mercury 0.22 NA 0.02 0.14 NA 0.51Selenium 7.5 U NA 7.5 U 7.5 U NA 7.5 USilver 1 U NA 1 U 1.0 U NA 1 UCyanide 0.4 NA 0.1 U 7.1 NA 1.4Notes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.3) NA - Not analyzed.



Aurora MGP Site



Benzene NA 21 NA 73 0.25 U 0.25 UEthylbenzene NA 6.6 NA 67 0.25 U 0.25 UToluene NA 0.68 NA 25 0.25 U 0.25 UXylenes (total) NA 7.3 NA 54 0.25 U 0.25 UStyrene NA 0.25 U NA 0.4 U 0.25 U 0.25 U

Phenols (mg/kg)2,4-Dimethylphenol NA 130 UJ NA 66 UJ 6.6 UJ 3.3 UJ2-Methylphenol (O-cresol) NA 130 UJ NA 66 UJ 6.6 UJ 3.3 UJ4-Methylphenol (P-cresol) NA 130 UJ NA 66 UJ 6.6 UJ 3.3 UJPhenol NA 130 UJ NA 66 UJ 6.6 UJ 3.3 UJ

PAHs (mg/kg)Acenaphthene 22 215 J 285 190 J 1.20 UJ 2.26 JAcenaphthylene 77.4 376 J 260 260 J 1.54 J 1.54 UJAnthracene 140 345 J 330 159 J 1.08 J 2.70 JBenzo(a)anthracene 54.9 260 J 170 84 J 1.90 J 3.78 JBenzo(b)fluoranthene 20.8 170 J 130 53 J 5.70 J 0.787 JBenzo(k)fluoranthene 16.6 160 J 85 44 J 1.90 J 0.669 JBenzo(a)pyrene 38.3 780 J 177 81 J 6.08 J 1.72 JBenzo(g,h,i)perylene 13.9 170 J 36 42 J 11.9 J 1.62 JChrysene 38.3 270 J 180 78 J 1.26 J 3.34 JDibenzo(a,h)anthracene 3.1 58 J 165 U 16 J 10.2 J 0.080 UJFluoranthene 162 630 J 420 200 J 1.90 J 12.9 JFluorene 88.5 570 J 350 179 J 0.140 UJ 6.26 JIndeno(1,2,3-cd)pyrene 13.1 170 J 165 U 43 J 7.22 J 0.798 JNaphthalene 649 8200 J 3200 1800 J 16.4 J 1.62 JPhenanthrene 316 1500 J 956 505 J 1.26 J 4.21 JPyrene 152 812 J 165 U 66 UJ 2.91 J 9.17 JDibenzofuran 71 130 UJ 67 66 UJ 6.6 UJ 3.3 UJ2-Methylnaphthalene 19 900 J 1110 650 J 6.6 UJ 3.3 UJ

RCRA Metals and Cyanide (mg/kg)Arsenic NA 61 NA 7 18 1.3Barium NA 21 NA 33 51 4.5Cadmium NA 0.4 U NA 0.4 U 0.77 0.40 UChromium NA 83 NA 0.7 U 13 0.70 ULead NA 255 NA 93 560 4.2 UMercury NA 0.02 U NA 0.09 0.03 0.04Selenium NA 7.5 NA 7.5 U 0.48 U 0.48 USilver NA 1 U NA 1 U 1.0 U 1.0 UCyanide NA 3.7 NA 100 42 J 0.73 JNotes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.3) NA - Not analyzed.



Aurora MGP Site



Benzene 0.25 U 0.25 U 0.76 0.25 U 0.27 4.1Ethylbenzene 0.25 U 0.25 U 12 5.1 7 39Toluene 0.25 U 0.25 U 0.25 U 0.25 U 0.34 3Xylenes (total) 0.25 U 0.25 U 7.4 3.3 8 32Styrene 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U

Phenols (mg/kg)2,4-Dimethylphenol 17 UJ 0.66 U 6.6 UJ 3.3 UJ 20 UJ 13 UJ2-Methylphenol (O-cresol) 17 UJ 0.66 U 6.6 UJ 3.3 UJ 20 UJ 13 UJ4-Methylphenol (P-cresol) 17 UJ 0.66 U 6.6 UJ 3.3 UJ 20 UJ 13 UJPhenol 17 UJ 0.66 U 6.6 UJ 3.3 UJ 20 UJ 13 UJ

PAHs (mg/kg)Acenaphthene 4.88 J 1.20 U 130 J 43 J 202 J 1100 JAcenaphthylene 4.0 UJ 1.54 U 61 J 7.7 J 271 J 201 JAnthracene 1.08 J 0.440 U 97 J 23 J 195 J 540 JBenzo(a)anthracene 3.54 J 0.0087 U 82 J 9.5 J 86 J 169 JBenzo(b)fluoranthene 4.21 J 0.012 U 51 J 5.6 J 200 J 130 JBenzo(k)fluoranthene 2.69 J 0.011 U 49 J 5.7 J 159 J 105 JBenzo(a)pyrene 4.71 J 0.015 U 65 J 8.7 J 260 J 172 JBenzo(g,h,i)perylene 7.91 J 0.051 U 24 J 3.1 J 78 J 50 JChrysene 7.07 J 0.100 U 72 J 9.2 J 198 J 154 JDibenzo(a,h)anthracene 5.39 J 0.020 U 15 J 1.8 J 43 J 28 JFluoranthene 11.4 J 0.140 U 190 J 25 J 384 J 640 JFluorene 3.53 J 0.140 U 63 J 21 J 113 J 500 JIndeno(1,2,3-cd)pyrene 4.38 J 0.028 U 24 J 3 J 77 J 48 JNaphthalene 26.9 J 1.20 U 183 J 84 J 276 J 2900 JPhenanthrene 8.42 J 0.428 U 170 J 58 J 349 J 1600 JPyrene 2.52 J 0.180 U 154 J 24 J 407 J 565 JDibenzofuran 17 UJ 0.66 U 16 J 5.7 J 20 UJ 90 J2-Methylnaphthalene 17 UJ 0.66 U 47 J 47 J 49 J 1100 J

RCRA Metals and Cyanide (mg/kg)Arsenic 13 1.9 6.2 1.8 54 14Barium 42 6.8 10 4.7 150 17Cadmium 0.88 0.40 U 0.4 U 0.4 U 10 0.72Chromium 4.9 0.70 U 0.7 U 3 3.8 0.7 ULead 48 4.2 U 13 7.3 60 47Mercury 0.15 0.02 U 0.06 0.02 U 0.02 U 0.02Selenium 0.48 U 0.48 U 7.5 7.5 U 7.5 U 7.5 USilver 1.0 U 1.0 U 1 U 1 U 1 U 1 UCyanide 79 J 0.10 UJ 0.1 U 0.77 3.3 4.4Notes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.



Aurora MGP Site

Sample Location and Depth (feet below ground surface)/ConcentrationSB14-002 SB15-002 SB15-003 SB16a-002 SB16a-003 SB16a-004


Benzene 2.3 0.40 0.25 U 0.25 U 0.25 U NAEthylbenzene 16 20 0.25 U 0.25 U 23 NAToluene 0.47 30 0.25 U 0.25 U 0.33 NAXylenes (total) 10 170 0.25 U 0.25 U 16 NAStyrene 0.25 U 0.50 U 0.25 U 0.25 U 0.25 U NA

Phenols (mg/kg)2,4-Dimethylphenol 3.3 UJ 86 UJ 0.66 U 6.6 UJ NA 6.6 UJ2-Methylphenol (O-cresol) 3.3 UJ 86 UJ 0.66 U 6.6 UJ NA 6.6 UJ4-Methylphenol (P-cresol) 3.3 UJ 86 UJ 0.66 U 6.6 UJ NA 6.6 UJPhenol 3.3 UJ 86 UJ 0.66 U 6.6 UJ NA 6.6 UJ

PAHs (mg/kg)Acenaphthene 49 J 2100 J 2.0 UJ 5.0 J NA 10 JAcenaphthylene 7.5 J 4.0 UJ 4.0 UJ 1.54 UJ NA 4.0 UJAnthracene 22 J 48.9 J 1.81 J 0.890 J NA 4.7 JBenzo(a)anthracene 11 J 74.9 J 2.15 J 5.9 J NA 5.0 JBenzo(b)fluoranthene 6.6 J 41.3 J 0.329 J 3.1 J NA 0.760 JBenzo(k)fluoranthene 3.6 J 35.2 J 0.283 J 1.8 J NA 0.250 JBenzo(a)pyrene 8.2 J 6.57 J 0.930 J 7.5 J NA 2.6 JBenzo(g,h,i)perylene 3.3 J 102 J 0.612 J 5.9 J NA 1.7 JChrysene 10 J 176 J 1.03 J 4.8 J NA 2.1 JDibenzo(a,h)anthracene 1.7 J 6.27 J 0.612 J 0.470 J NA 0.260 JFluoranthene 23 J 810 J 3.17 J 12 J NA 10 JFluorene 23 J 205 J 2.27 J 0.300 J NA 10 JIndeno(1,2,3-cd)pyrene 3.3 J 81.0 J 0.454 J 4.8 J NA 1.6 JNaphthalene 87 J 3700 J 6.12 J 3.6 J NA 27 JPhenanthrene 63 J 826 J 6.46 J 3.7 J NA 19 JPyrene 29 J 290 J 2.83 J 8.6 J NA 5.8 JDibenzofuran 4.9 J 86 UJ 0.66 U 6.6 UJ NA 6.6 UJ2-Methylnaphthalene 1.3 J 86 UJ 0.66 U 6.6 UJ NA 21 J

RCRA Metals and Cyanide (mg/kg)Arsenic 1.8 13 2.5 8.4 NA 1.7Barium 18 2.6 6.1 87 NA 5.2Cadmium 0.4 U 0.40 U 0.40 U 1.2 NA 0.40 UChromium 0.7 U 0.70 U 2.6 8.7 NA 3.9Lead 14 140 9.0 39 NA 4.2 UMercury 0.07 0.02 U 0.02 U 0.09 NA 0.02 USelenium 7.5 U 0.48 U 0.48 U 7.5 U NA 7.5 USilver 1 U 1.0 U 1.0 U 1.0 U NA 1.0 UCyanide 4.6 2300 J 3.6 J 0.38 NA 0.10 UNotes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.3) NA - Not analyzed.



Aurora MGP Site

Sample Location and Depth (feet below ground surface)/ConcentrationSB17a-002 SB17a-003 SB18-001 SB18-002 SB18-003 SB19-002


Benzene 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U 1.8Ethylbenzene 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U 23Toluene 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U 0.34Xylenes (total) 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U 5.3Styrene 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U

Phenols (mg/kg)2,4-Dimethylphenol 0.66 U 0.66 U 3.3 UJ 0.66 U 0.66 U 6.6 UJ2-Methylphenol (O-cresol) 0.66 U 0.66 U 3.3 UJ 0.66 U 0.66 U 6.6 UJ4-Methylphenol (P-cresol) 0.66 U 0.66 U 3.3 UJ 0.66 U 0.66 U 6.6 UJPhenol 0.66 U 0.66 U 3.3 UJ 0.66 U 0.66 U 6.6 UJ

PAHs (mg/kg)Acenaphthene 1.2 U 1.2 U 1.20 UJ 1.20 UJ 1.20 U 73.8 JAcenaphthylene 1.54 U 1.54 U 1.54 UJ 1.54 UJ 1.54 U 36.1 JAnthracene 0.44 U 0.44 U 0.440 UJ 0.440 UJ 0.440 U 42.9 JBenzo(a)anthracene 0.012 0.009 0.397 J 0.211 J 0.0087 U 174 JBenzo(b)fluoranthene 0.015 0.012 U 0.357 J 0.149 J 0.020 163 JBenzo(k)fluoranthene 0.011 0.011 U 0.246 J 0.279 J 0.011 U 101 JBenzo(a)pyrene 0.016 0.015 U 0.522 J 0.015 UJ 0.015 U 281 JBenzo(g,h,i)perylene 0.051 U 0.051 U 0.271 J 0.222 J 0.051 U 60.8 JChrysene 0.1 U 0.1 U 0.413 J 0.162 J 0.100 U 144 JDibenzo(a,h)anthracene 0.02 U 0.02 U 0.117 J 0.020 UJ 0.020 U 43.3 JFluoranthene 0.14 U 0.14 U 0.972 J 0.470 J 0.140 U 275 JFluorene 0.14 U 0.14 U 0.140 UJ 0.252 J 0.140 U 28.3 JIndeno(1,2,3-cd)pyrene 0.028 U 0.028 U 0.344 J 0.028 UJ 0.028 U 288 JNaphthalene 1.2 U 1.2 U 1.20 UJ 1.20 UJ 1.20 U 149 JPhenanthrene 0.428 U 0.428 U 0.546 J 0.428 UJ 0.428 U 134 JPyrene 0.18 U 0.18 U 0.463 J 0.207 J 0.180 U 211 JDibenzofuran 0.66 U 0.66 U 3.3 UJ 0.66 U 0.66 U 6.6 UJ2-Methylnaphthalene 0.66 U 0.66 U 3.3 UJ 0.66 U 0.66 U 35 J

RCRA Metals and Cyanide (mg/kg)Arsenic 2.34 2.28 12 5.1 1.1 18Barium 32 5.5 180 78 10 110Cadmium 0.4 U 0.4 U 2.0 3.5 0.40 U 2.1Chromium 11 2.4 2.1 9.3 0.70 U 8.8Lead 12 4.2 U 830 100 4.2 U 340Mercury 0.04 0.02 U 0.30 0.22 0.02 U 1.1Selenium 7.5 U 7.5 U 7.5 U 7.5 U 7.5 U 0.48 USilver 1 U 1 U 1.0 U 1.0 U 1.0 U 1.0 UCyanide 0.1 U 0.1 U 0.45 0.48 0.10 U 0.57Notes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.



Aurora MGP Site



Benzene 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U 0.25 UEthylbenzene 0.25 U 0.25 U 0.25 U 34 0.25 U 0.25 UToluene 0.25 U 0.25 U 0.25 U 1.1 0.25 U 0.25 UXylenes (total) 0.25 U 0.25 U 0.25 U 30 0.25 U 0.25 UStyrene 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U

Phenols (mg/kg)2,4-Dimethylphenol 0.66 U 0.66 U 0.66 U 6.6 UJ 0.66 U 0.66 U2-Methylphenol (O-cresol) 0.66 U 0.66 U 0.66 U 6.6 UJ 0.66 U 0.66 U4-Methylphenol (P-cresol) 0.66 U 0.66 U 0.66 U 6.6 UJ 0.66 U 0.66 UPhenol 0.66 U 0.66 U 0.66 U 6.6 UJ 0.66 U 0.66 U

PAHs (mg/kg)Acenaphthene 1.20 U 1.20 U 1.20 U 158 J 1.20 U 1.20 UAcenaphthylene 1.54 U 1.54 U 1.54 U 1.54 UJ 1.54 U 1.54 UAnthracene 1.91 0.440 U 0.440 U 98.8 J 0.440 U 0.440 UBenzo(a)anthracene 0.121 0.097 J 0.0087 U 32.0 J 0.091 0.0087 UBenzo(b)fluoranthene 0.856 0.084 J 0.012 U 12.5 J 0.034 0.012 UBenzo(k)fluoranthene 0.065 0.054 J 0.011 U 8.28 J 0.023 0.011 UBenzo(a)pyrene 0.109 0.151 J 0.015 U 55.7 J 0.082 0.015 UBenzo(g,h,i)perylene 0.098 0.097 J 0.051 U 19.3 J 0.051 U 0.051 UChrysene 0.100 U 0.100 U 0.100 U 23.5 J 0.100 U 0.100 UDibenzo(a,h)anthracene 0.020 U 0.020 U 0.020 U 6.05 J 0.020 U 0.020 UFluoranthene 0.329 0.168 J 0.140 U 124 J 0.140 U 0.140 UFluorene 0.140 U 0.140 U 0.140 U 77.8 J 0.279 0.140 UIndeno(1,2,3-cd)pyrene 0.043 0.127 J 0.028 U 20.9 J 0.028 U 0.028 UNaphthalene 1.20 U 1.20 U 1.20 U 628 J 1.20 U 1.20 UPhenanthrene 0.428 U 0.428 U 0.428 U 260 J 0.453 0.428 UPyrene 0.319 0.180 U 0.180 U 95.3 J 0.180 U 0.180 UDibenzofuran 0.66 U 0.66 U 0.66 U 31 J 0.66 U 0.66 U2-Methylnaphthalene 0.66 U 0.66 U 0.66 U 390 J 0.66 U 0.66 U

RCRA Metals and Cyanide (mg/kg)Arsenic 0.50 U 1.4 3.5 37 2.2 1.03Barium 9.5 7.8 32 300 7.6 13Cadmium 0.40 U 0.40 U 0.40 U 2.5 0.40 U 0.40 UChromium 2.8 2.3 3.7 51 2.3 0.70 ULead 9.7 7.4 7.9 93 13 4.2 UMercury 0.05 0.09 0.09 0.02 U 0.02 U 0.06Selenium 0.48 U 0.48 U 0.61 0.83 0.74 7.5 USilver 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 3.1Cyanide 0.10 U 0.10 U 0.10 U 0.29 0.10 U 0.10 UNotes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.



Aurora MGP Site



Benzene 40 1.2 0.25 U 0.25 U 0.25 U 0.25 UEthylbenzene 79 48 0.25 U 0.25 U 0.25 U 0.25 UToluene 39 1.1 0.25 U 0.25 U 0.25 U 0.25 UXylenes (total) 62 34 0.25 U 0.25 U 0.25 U 0.25 UStyrene 3.9 0.6 U 0.25 U 0.25 U 0.25 U 0.25 U

Phenols (mg/kg)2,4-Dimethylphenol 5 UJ 3.3 UJ NA 3.3 UJ 0.66 U NA2-Methylphenol (O-cresol) 5 UJ 3.3 UJ NA 3.3 UJ 0.66 U NA4-Methylphenol (P-cresol) 5 UJ 3.3 UJ NA 3.3 UJ 0.66 U NAPhenol 5 UJ 3.3 UJ NA 3.3 UJ 0.66 U NA

PAHs (mg/kg)Acenaphthene 500 J 123 J NA 1.2 UJ 1.2 U NAAcenaphthylene 160 J 35 J NA 1.54 UJ 1.54 U NAAnthracene 1130 J 246 J NA 0.44 UJ 0.44 U NABenzo(a)anthracene 279 J 59.9 J NA 0.339 J 0.181 U NABenzo(b)fluoranthene 217 J 37.3 J NA 0.129 J 0.1 U NABenzo(k)fluoranthene 132 J 27.7 J NA 0.011 UJ 0.148 U NABenzo(a)pyrene 298 J 51.5 J NA 0.072 J 0.112 U NABenzo(g,h,i)perylene 116 J 23.7 J NA 0.051 UJ 0.1 U NAChrysene 485 J 78.2 J NA 0.38 J 0.1 U NADibenzo(a,h)anthracene 33.7 J 6.6 J NA 0.02 UJ 0.06 U NAFluoranthene 536 J 139 J NA 0.696 J 0.14 UR NAFluorene 469 J 90.2 J NA 0.14 UJ 0.14 U NAIndeno(1,2,3-cd)pyrene 94.3 J 12.6 J NA 0.028 UJ 0.096 U NANaphthalene 1260 J 358 J NA 1.2 UJ 1.2 UR NAPhenanthrene 840 J 224 J NA 0.428 UJ 0.428 U NAPyrene 657 J 159 J NA 0.209 J 0.223 U NADibenzofuran 19 J 3.3 UJ NA 3.3 UJ 0.66 U NA2-Methylnaphthalene 200 J 8.3 J NA 3.3 UJ 0.66 U NA

RCRA Metals and Cyanide (mg/kg)Arsenic 36.4 NA NA NA 1.6 NABarium 50 NA NA NA 11 NACadmium 3.9 NA NA NA 0.4 U NAChromium 7.5 NA NA NA 5.9 NALead 42 NA NA NA 4.2 U NAMercury 0.02 U NA NA NA 0.03 NASelenium 7.5 U NA NA NA 7.5 U NASilver 1 U NA NA NA 1 U NACyanide 8.8 NA NA NA 0.1 U NANotes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.3) NA - Not analyzed.4) R - The result is unusable. The compound/analyte may or may not be present.



Aurora MGP Site

Sample Location and Depth (feet below ground surface)/ConcentrationSB26-004 SB26-005 SB26-006 SB27a-002 SB27a-003 SB28a-002


Benzene NA NA 0.25 U 0.25 U 0.25 U 0.25 UEthylbenzene NA NA 0.25 U 0.25 U 0.25 U 0.25 UToluene NA NA 0.25 U 0.25 U 0.25 U 0.25 UXylenes (total) NA NA 0.25 U 0.25 U 0.25 U 0.25 UStyrene NA NA 0.25 U 0.25 U 0.25 U 0.25 U

Phenols (mg/kg)2,4-Dimethylphenol 3.3 UJ 3.3 UJ 3.3 UJ 3.3 UJ 0.66 U 0.66 U2-Methylphenol (O-cresol) 3.3 UJ 3.3 UJ 3.3 UJ 3.3 UJ 0.66 U 0.66 U4-Methylphenol (P-cresol) 3.3 UJ 3.3 UJ 3.3 UJ 3.3 UJ 0.66 U 0.66 UPhenol 3.3 UJ 3.3 UJ 3.3 UJ 3.3 UJ 0.66 U 0.66 U

PAHs (mg/kg)Acenaphthene 8.80 J 8.0 J 2.2 J 1.20 U 1.20 U 1.20 UAcenaphthylene 1.54 UJ 1.54 UJ 1.54 UJ 1.54 U 1.54 U 1.54 UAnthracene 23.0 J 13 J 3.8 J 0.440 U 0.440 U 0.440 UBenzo(a)anthracene 6.0 J 5.8 J 1.0 J 0.0087 U 0.0087 U 0.181 UBenzo(b)fluoranthene 3.2 J 3.7 J 1.1 J 0.012 U 0.012 U 0.100 UBenzo(k)fluoranthene 2.2 J 2.2 J 0.437 J 0.011 U 0.011 U 0.148 UBenzo(a)pyrene 4.3 J 3.8 J 0.266 J 0.015 U 0.015 U 0.112 UBenzo(g,h,i)perylene 1.6 J 0.889 J 0.108 J 0.051 U 0.051 U 0.100 UChrysene 7.5 J 6.5 J 0.726 J 0.100 U 0.100 U 0.100 UDibenzo(a,h)anthracene 0.551 J 0.408 J 0.35 J 0.020 U 0.020 U 0.060 UFluoranthene 17.3 J 11.1 J 3.1 J 0.140 U 0.140 U 0.140 UFluorene 11.3 J 0.140 UJ 2.0 J 0.140 U 0.140 U 0.140 UIndeno(1,2,3-cd)pyrene 0.882 J 0.646 J 0.35 UJ 0.028 U 0.028 U 0.096 UNaphthalene 1.20 UJ 1.20 J 1.20 UJ 1.20 U 1.20 U 1.20 UPhenanthrene 1.2 J 0.490 J 0.428 UJ 0.428 U 0.428 U 0.428 UPyrene 20.4 J 12.4 J 2.8 J 0.180 U 0.180 U 0.223 UDibenzofuran 3.3 UJ 3.3 UJ 3.3 UJ 3.3 UJ 0.66 U 0.66 U2-Methylnaphthalene 11.0 J 3.3 UJ 3.3 UJ 3.3 UJ 0.66 U 0.66 U

RCRA Metals and Cyanide (mg/kg)Arsenic 1.65 NA 3.42 5.8 NA 1.5Barium 8.86 NA 8.62 23 NA 33Cadmium 0.40 U NA 0.40 U 0.64 NA 0.40 UChromium 3.3 NA 2.9 2.9 NA 2.7Lead 9.6 NA 4.2 U 9.3 NA 4.2 UMercury 0.02 NA 0.02 U 0.02 U NA 0.02 USelenium 7.5 U NA 7.5 U 0.48 U NA 0.56 Silver 1.0 U NA 1.0 U 1.0 U NA 1.0 UCyanide 0.71 NA 3.4 0.10 UJ NA 0.10 UNotes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.3) NA - Not analyzed.



Aurora MGP Site

Sample Location and Depth (feet below ground surface)/ConcentrationSB29a-002 SB29-003 SB30a-002 SB31-002 SB32-002 SP16-001


Benzene 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U 0.25 UEthylbenzene 0.25 U 0.25 U 0.25 U 8.1 8.3 0.25 UToluene 0.25 U 0.25 U 0.25 U 0.25 U 0.47 0.25 UXylenes (total) 0.25 U 0.25 U 0.25 U 13 5.5 0.25 UStyrene 0.25 U 0.25 U 0.25 U 0.25 U 1.7 0.25 U

Phenols (mg/kg)2,4-Dimethylphenol 0.66 U 0.66 U 0.66 U 0.66 U 3.3 UJ 0.66 U2-Methylphenol (O-cresol) 0.66 U 0.66 U 0.66 U 0.66 U 3.3 UJ 0.66 U4-Methylphenol (P-cresol) 0.66 U 0.66 U 0.66 U 0.66 U 3.3 UJ 0.66 UPhenol 0.66 U 0.66 U 0.66 U 0.66 U 3.3 UJ 0.66 U

PAHs (mg/kg)Acenaphthene 1.20 U 2.00 1.20 U 1.20 UJ 28.3 J 1.20 UAcenaphthylene 1.54 U 1.54 U 1.54 U 1.54 UJ 6.08 J 1.54 UAnthracene 0.440 U 1.60 0.440 U 0.440 UJ 27.8 J 0.440 UBenzo(a)anthracene 0.181 U 1.30 0.0087 U 0.0087 UJ 12.1 J 0.0087 UBenzo(b)fluoranthene 0.100 U 0.42 0.012 U 0.012 UJ 11.4 J 0.012 UBenzo(k)fluoranthene 0.148 U 0.59 0.011 U 0.011 UJ 6.45 J 0.011 UBenzo(a)pyrene 0.112 U 0.75 0.015 U 0.015 UJ 15.0 J 0.015 UBenzo(g,h,i)perylene 0.100 U 0.100 U 0.051 U 0.051 UJ 2.46 J 0.051 UChrysene 0.100 U 0.96 0.100 U 0.100 UJ 9.09 J 0.100 UDibenzo(a,h)anthracene 0.060 U 0.09 0.020 U 0.020 UJ 0.720 J 0.020 UFluoranthene 0.140 U 1.60 0.140 U 0.140 UJ 35.1 J 0.140 UFluorene 0.14 U 1.20 0.140 U 0.140 UJ 18.7 J 0.140 UIndeno(1,2,3-cd)pyrene 0.096 U 0.23 0.028 U 0.028 UJ 0.028 UJ 0.028 UNaphthalene 1.20 U 1.90 1.20 U 1.20 UJ 42.7 J 1.20 UPhenanthrene 0.428 U 3.30 0.428 U 0.428 UJ 54.1 J 0.428 UPyrene 0.223 U 2.20 0.180 U 0.180 UJ 27.6 J 0.180 UDibenzofuran 0.66 U 0.66 U 0.66 U 0.66 U 3.3 UJ 0.66 U2-Methylnaphthalene 0.66 U 0.66 U 0.66 U 7.8 5.0 J 0.66 U

RCRA Metals and Cyanide (mg/kg)Arsenic 2.9 1.4 1.9 1.2 3.7 1.9Barium 130 4.7 7.4 11 23 38Cadmium 0.40 U 0.40 U 0.40 U 0.40 U 0.40 U 0.40 UChromium 4.1 0.70 U 3.0 2.2 5.5 0.7 ULead 10 4.2 U 4.2 U 6.0 13 4.2 UMercury 0.02 U 0.02 U 0.02 U 0.02 U 0.06 0.02Selenium 0.48 U 0.48 U 0.48 U 7.5 U 7.5 U 7.5 USilver 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 UCyanide 0.10 U 0.10 U 0.10 U 0.10 U 9.9 0.10 UNotes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.



Aurora MGP Site

Sample Location and Depth (feet below ground surface)/ConcentrationSP17-001 SP21-001 SP21-002 SP23-001 SP27-001 SP46-001


Benzene 0.25 U 0.25 U NA 0.25 U 0.25 U 0.25 UEthylbenzene 0.25 U 0.25 U NA 0.25 U 0.25 U 0.25 UToluene 0.25 U 0.25 U NA 0.25 U 0.25 U 0.25 UXylenes (total) 0.25 U 0.25 U NA 0.25 U 0.25 U 0.25 UStyrene 0.25 U 0.25 U NA 0.25 U 0.25 U 0.25 U

Phenols (mg/kg)2,4-Dimethylphenol NA NA 0.66 U 3.3 UJ 0.66 U NA2-Methylphenol (O-cresol) NA NA 0.66 U 3.3 UJ 0.66 U NA4-Methylphenol (P-cresol) NA NA 0.66 U 3.3 UJ 0.66 U NAPhenol NA NA 0.66 U 3.3 UJ 0.66 U NA

PAHs (mg/kg)Acenaphthene NA NA 1.20 U 1.20 UJ 1.20 U NAAcenaphthylene NA NA 1.54 U 1.54 UJ 1.54 U NAAnthracene NA NA 0.440 U 0.440 UJ 0.440 U NABenzo(a)anthracene NA NA 0.0087 U 0.0087 UJ 0.0087 U NABenzo(b)fluoranthene NA NA 0.012 U 0.012 UJ 0.012 U NABenzo(k)fluoranthene NA NA 0.011 U 0.011 UJ 0.011 U NABenzo(a)pyrene NA NA 0.015 U 0.015 UJ 0.015 U NABenzo(g,h,i)perylene NA NA 0.051 U 0.051 UJ 0.051 U NAChrysene NA NA 0.100 U 0.100 UJ 0.100 U NADibenzo(a,h)anthracene NA NA 0.020 U 0.020 UJ 0.020 U NAFluoranthene NA NA 0.140 U 0.882 J 0.140 U NAFluorene NA NA 0.140 U 0.380 J 0.140 U NAIndeno(1,2,3-cd)pyrene NA NA 0.028 U 0.028 UJ 0.028 U NANaphthalene NA NA 1.3 2.17 J 1.20 U NAPhenanthrene NA NA 0.428 U 0.529 J 0.428 U NAPyrene NA NA 0.180 U 1.06 J 0.180 U NADibenzofuran NA NA 0.66 U 3.3 UJ 0.66 U NA2-Methylnaphthalene NA NA 0.66 U 3.3 UJ 0.66 U NA

RCRA Metals and Cyanide (mg/kg)Arsenic NA NA NA 1.2 NA NABarium NA NA NA 122 NA NACadmium NA NA NA 0.40 U NA NAChromium NA NA NA 5.5 NA NALead NA NA NA 9.9 NA NAMercury NA NA NA 0.04 NA NASelenium NA NA NA 0.73 NA NASilver NA NA NA 1.3 NA NACyanide NA NA NA 1.2 NA NANotes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.3) NA - Not analyzed.



Aurora MGP Site

Sample Location and Depth (feet below ground surface)/ConcentrationSP48-001 SP51-001

Compound/Analyte 8-12 8-12BTEX / Styrene (mg/kg)

Benzene 0.25 U 0.25 UEthylbenzene 1.4 1.7Toluene 0.25 U 0.25 UXylenes (total) 1.3 1.8Styrene 0.25 U 0.25 U

Phenols (mg/kg)2,4-Dimethylphenol 3.3 UJ 3.3 UJ2-Methylphenol (O-cresol) 3.3 UJ 3.3 UJ4-Methylphenol (P-cresol) 3.3 UJ 3.3 UJPhenol 3.3 UJ 3.3 UJ

PAHs (mg/kg)Acenaphthene 1.20 U 52.9 JAcenaphthylene 1.54 U 4.0 UJAnthracene 0.440 U 11.6 JBenzo(a)anthracene 0.177 15.6 JBenzo(b)fluoranthene 0.024 2.17 JBenzo(k)fluoranthene 0.011 U 2.04 JBenzo(a)pyrene 0.072 7.22 JBenzo(g,h,i)perylene 0.069 4.45 JChrysene 0.100 U 6.62 JDibenzo(a,h)anthracene 0.020 U 3.49 JFluoranthene 0.851 21.7 JFluorene 0.236 25.3 JIndeno(1,2,3-cd)pyrene 0.034 3.13 JNaphthalene 1.65 79.4 JPhenanthrene 0.428 U 50.5 JPyrene 0.201 18.1 JDibenzofuran 3.3 UJ 6.6 J2-Methylnaphthalene 3.3 UJ 15 J

RCRA Metals and Cyanide (mg/kg)Arsenic 2.8 2.5Barium 68 44Cadmium 0.40 U 0.40 UChromium 6.0 8.4Lead 10 6.0Mercury 0.02 U 0.04Selenium 0.48 U 0.48 USilver 1.0 U 1.8Cyanide 0.10 U 0.10 UNotes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.


Table B-3SI Subsurface Soil Target Compound List (TCL) Analytical Results

Aurora MGP Site

Sample Location and Depth (feet below ground surface) ConcentrationCompound/Analyte HA04-001 SP51-001 SB01a-005 SB01a-004 SB02-003 SB02-004

0-6 8-12 14-16 16-18 10-12 12-14TCL Volatiles (mg/kg)

Acetone 6.7 5.0 U 5.0 U 5.0 U 5.0 U 5.0 UBenzene 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U 0.25 UBromodichloromethane 0.25 U 0.5 U 0.25 U 0.25 U 0.25 U 0.25 UBromoform 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U 0.25 UBromomethane 0.50 U 0.50 U 0.50 U 0.50 U 0.50 U 0.50 U2-Butanone 5.0 U 0.5 U 5.0 U 5.0 U 5.0 U 5.0 UCarbon disulfide 5.0 U 0.5 U 5.0 U 5.0 U 5.0 U 5.0 UCarbon tetrachloride 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U 0.25 UChlorobenzene 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U 0.25 UChloroethane 0.50 U 0.50 U 0.50 U 0.50 U 0.50 U 0.50 UChloroform 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U 0.25 UChloromethane 0.50 U 0.50 U 0.50 U 0.50 U 0.50 U 0.50 UChlorodibromomethane 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U1,1-Dichloroethane 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U1,2-Dichloroethane 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U1,1-Dichloroethene 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U 0.25 Ucis-1,2-Dichloroethene 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U 0.25 Utrans-1,2-Dichloroethene 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U1,2-Dichloropropane 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U 0.25 Ucis-1,3-Dichloropropene 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U 0.25 Utrans-1,3-Dichloropropene 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U 0.25 UEthylbenzene 0.25 U 1.7 0.25 U 0.25 U 0.25 U 0.25 U2-Hexanone 2.5 U 0.5 U 2.5 U 2.5 U 2.5 U 2.5 U4-Methyl-2-pentanone 2.5 U 0.5 U 2.5 U 2.5 U 2.5 U 2.5 UMethlene chloride 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U 0.25 UStyrene 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U1,1,2,2-Tetrachloroethane 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U 0.25 UTetrachloroethane 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U 0.25 UToluene 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U1,1,1-Trichloroethane 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U1,1,2-Trichloroethane 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U 0.25 UTrichloroethene 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U 0.25 UVinly chloride 0.50 U 0.50 U 0.50 U 0.50 U 0.50 U 0.50 UXylenes (total) 0.25 U 1.8 0.25 U 0.25 U 0.25 U 0.25 UNote:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.


Table B-3 (Continued)SI Subsurface Soil Target Compound List (TCL) Analytical Results

Aurora MGP Site

Sample Location and Depth (feet below ground surface) ConcentrationHA04-001 SP51-001 SB01a-005 SB01a-004 SB02-003 SB02-004

Compound/Analyte 0-6 8-12 14-16 16-18 10-12 12-14TCL Semivolatiles (mg/kg)

4-Chloro-3-methylphenol 6.6 UJ NA 1.3 U 1.3 U NA NA 2-Chlorophenol 6.6 UJ NA 0.66 U 0.66 U NA NA 2,4-Dichlorophenol 6.6 UJ NA 0.66 U 0.66 U NA NA 2,4-Dimethylphenol 6.6 UJ NA 0.66 U 0.66 U NA NA 2,4-Dinitrophenol 33 UJ NA 3.3 U 3.3 U NA NA 2-Methyl-4,6-dinitrophenol 33 UJ NA 3.3 U 3.3 U NA NA 2-Methylphenol (O-cresol) 6.6 UJ NA 0.66 U 0.66 U NA NA 4-Methylphenol (P-cresol) 6.6 UJ NA 0.66 U 0.66 U NA NA 2-Nitrophenol 6.6 UJ NA 0.66 U 0.66 U NA NA 4-Nitrophenol 33 UJ NA 3.3 U 3.3 U NA NA Pentachlorophenol 33 UJ NA 3.3 U 3.3 U NA NA Phenol 6.6 UJ NA 0.66 U 0.66 U NA NA 2,4,5-Trichlorophenol 6.6 UJ NA 0.66 U 0.66 U NA NA 2,4,6-Trichlorophenol 6.6 UJ NA 0.66 U 0.66 U NA NA Benzyl butyl phthalate 6.6 UJ NA 0.66 U 0.66 U NA NA Bis(2-chloroethoxy)methane 6.6 UJ NA 0.66 U 0.66 U NA NA Bis(2-chloroethyl)ether 6.6 UJ NA 0.66 U 0.66 U NA NA Bis(2-chloroisopropyl)ether 6.6 UJ NA 0.66 U 0.66 U NA NA Bis(2-ethylhexyl)phthalate 6.6 UJ NA 0.66 U 0.66 U NA NA 4-Bromophenyl phenyl ether 6.6 UJ NA 0.66 U 0.66 U NA NA Carbazole 6.6 UJ NA 0.66 U 0.66 U NA NA 4-Chloroaniline 13 UJ NA 1.3 U 1.3 U NA NA 2-Chloronaphthalene 6.6 UJ NA 0.66 U 0.66 U NA NA 4-Chlorophenyl phenyl ether 6.6 UJ NA 0.66 U 0.66 U NA NA Dibenzofuran 6.6 UJ NA 0.66 U 0.66 U NA NA Di-n-butyl phthalate 6.6 UJ NA 0.66 U 0.66 U NA NA 1,2-Dichlorobenzene 6.6 UJ NA 0.66 U 0.66 U NA NA 1,3-Dichlorobenzene 6.6 UJ NA 0.66 U 0.66 U NA NA 1,4-Dichlorobenzene 6.6 UJ NA 0.66 U 0.66 U NA NA 3,3-Dichlorobenzidine 13 UJ NA 1.3 U 1.3 U NA NA Diethyl phthalate 6.6 UJ NA 0.66 U 0.66 U NA NA Dimethyl phthalate 6.6 UJ NA 0.66 U 0.66 U NA NA 2,4-Dinitrotoluene 6.6 UJ NA 0.66 U 0.66 U NA NA 2,6-Dinitrotoluene 6.6 UJ NA 0.66 U 0.66 U NA NA Di-n-octyl phthalate 6.6 UJ NA 0.66 U 0.66 U NA NA Hexachlorobenzene 6.6 UJ NA 0.66 U 0.66 U NA NA Notes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.3) NA - Not analyzed.



Aurora MGP Site

Sample Location and Depth (feet below ground surface) ConcentrationHA04-001 SP51-001 SB01a-005 SB01a-004 SB02-003 SB02-004

Compound/Analyte 0-6 8-12 14-16 16-18 10-12 12-14TCL Semivolatiles (Continued) (mg/kg)

Hexachlorobutadiene 6.6 UJ NA 0.66 U 0.66 U NA NA Hexachlorocyclopentadiene 6.6 UJ NA 0.66 U 0.66 U NA NA Hexachloroethane 6.6 UJ NA 0.66 U 0.66 U NA NA Isophorone 6.6 UJ NA 0.66 U 0.66 U NA NA 2-Methylnaphthalene 6.6 UJ NA 0.66 U 0.66 U NA NA 2-Nitroaniline 33 UJ NA 3.3 U 3.3 U NA NA 3-Nitroaniline 33 UJ NA 3.3 U 3.3 U NA NA 4-Nitroaniline 13 UJ NA 1.3 U 1.3 U NA NA Nitrobenzene 6.6 UJ NA 0.66 U 0.66 U NA NA N-nitrosodimethylamine 6.6 UJ NA 0.66 U 0.66 U NA NA N-nitrosodi-n-propylamine 6.6 UJ NA 0.66 U 0.66 U NA NA N-nitrosodiphenylamine 6.6 UJ NA 0.66 U 0.66 U NA NA 1,2,4-Trichlorobenzene 6.6 UJ NA 0.66 U 0.66 U NA NA Acenaphthene 1.2 UJ NA 1.20 U 1.20 U NA NA Acenaphthylene 1.54 UJ NA 1.54 U 1.54 U NA NA Anthracene 0.44 UJ NA 0.440 U 0.440 U NA NA Benzo(a)anthracene 7.3 J NA 0.0087 U 0.0087 U NA NA Benzo(b)fluoranthene 5.7 J NA 0.012 U 0.012 U NA NA Benzo(k)fluoranthene 3.7 J NA 0.011 U 0.011 U NA NA Benzo(a)pyrene 1.4 J NA 0.015 U 0.015 U NA NA Benzo(g,h,i)perylene 1.8 J NA 0.051 U 0.051 U NA NA Chrysene 7.1 J NA 0.100 U 0.100 U NA NA Dibenzo(a,h)anthracene 0.613 J NA 0.020 U 0.020 U NA NA Fluoranthene 6.7 J NA 0.140 U 0.140 U NA NA Fluorene 2.5 J NA 0.140 U 0.140 U NA NA Indeno(1,2,3-cd)pyrene 2.5 J NA 0.028 U 0.028 U NA NA Naphthalene 2.2 J NA 1.20 U 1.20 U NA NA Phenanthrene 5 J NA 0.428 U 0.428 U NA NA Pyrene 8 J NA 0.180 U 0.180 U NA NA Notes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.3) NA - Not analyzed.



Aurora MGP Site

Sample Location and Depth (feet below ground surface) ConcentrationCompound/Analyte SB02-005 SB05a-001 SB05a-002 SB15-002 SB20-002

16-18 12-14 14-15 2-4 8-10TCL Volatiles (mg/kg)

Acetone 5.0 U 5.0 U 5.0 U 10.0 U 11Benzene 0.25 U 0.25 U 0.25 U 0.40 0.25 UBromodichloromethane 0.25 U 0.25 U 0.25 U 0.50 U 0.25 UBromoform 0.25 U 0.25 U 0.25 U 0.50 U 0.25 UBromomethane 0.50 U 0.50 U 0.50 U 1.0 U 0.50 U2-Butanone 5.0 U 5.0 U 5.0 U 10 U 5.0 UCarbon disulfide 5.0 U 5.0 U 5.0 U 10 U 5.0 UCarbon tetrachloride 0.25 U 0.25 U 0.25 U 0.50 U 0.25 UChlorobenzene 0.25 U 0.25 U 0.25 U 0.50 U 0.25 UChloroethane 0.50 U 0.50 U 0.50 U 1.0 U 0.50 UChloroform 0.25 U 0.25 U 0.25 U 0.5 U 0.25 UChloromethane 0.50 U 0.50 U 0.50 U 1.0 U 0.50 UChlorodibromomethane 0.25 U 0.25 U 0.25 U 0.50 U 0.25 U1,1-Dichloroethane 0.25 U 0.25 U 0.25 U 0.50 U 0.25 U1,2-Dichloroethane 0.25 U 0.25 U 0.25 U 0.50 U 0.25 U1,1-Dichloroethene 0.25 U 0.25 U 0.25 U 0.50 U 0.25 Ucis-1,2-Dichloroethene 0.25 U 0.25 U 0.25 U 0.50 U 0.25 Utrans-1,2-Dichloroethene 0.25 U 0.25 U 0.25 U 0.50 U 0.25 U1,2-Dichloropropane 0.25 U 0.25 U 0.25 U 0.50 U 0.25 Ucis-1,3-Dichloropropene 0.25 U 0.25 U 0.25 U 0.50 U 0.25 Utrans-1,3-Dichloropropene 0.25 U 0.25 U 0.25 U 0.50 U 0.25 UEthylbenzene 0.25 U 0.25 U 0.25 U 20 0.25 U2-Hexanone 2.5 U 2.5 U 2.5 U 5.0 U 2.5 U4-Methyl-2-pentanone 2.5 U 2.5 U 2.5 U 5.0 U 2.5 UMethlene chloride 0.25 U 0.25 U 0.25 U 0.50 U 0.25 UStyrene 0.25 U 0.25 U 0.25 U 0.50 U 0.25 U1,1,2,2-Tetrachloroethane 0.25 U 0.25 U 0.25 U 0.50 U 0.25 UTetrachloroethane 0.25 U 0.25 U 0.25 U 0.50 U 0.25 UToluene 0.25 U 0.25 U 0.25 U 30 0.25 U1,1,1-Trichloroethane 0.25 U 0.25 U 0.25 U 0.50 U 0.25 U1,1,2-Trichloroethane 0.25 U 0.25 U 0.25 U 0.50 U 0.25 UTrichloroethene 0.25 U 0.25 U 0.25 U 0.50 U 0.25 UVinly chloride 0.50 U 0.50 U 0.50 U 1.0 U 0.50 UXylenes (total) 0.25 U 0.25 U 0.25 U 170 0.25 UNote:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.



Aurora MGP Site

Sample Location and Depth (feet below ground surface) ConcentrationSB02-005 SB05a-001 SB05a-002 SB15-002 SB20-002

Compound/Analyte 16-18 12-14 14-15 2-4 8-10TCL Semivolatiles (mg/kg)

4-Chloro-3-methylphenol NA 3.3 UJ 1.3 U 170 UJ 1.3 U2-Chlorophenol NA 3.3 UJ 0.66 U 86 UJ 0.66 U2,4-Dichlorophenol NA 3.3 UJ 0.66 U 86 UJ 0.66 UR2,4-Dimethylphenol NA 3.3 UJ 0.66 U 86 UJ 0.66 U2,4-Dinitrophenol NA 16 UJ 3.3 U 430 UJ 3.3 U2-Methyl-4,6-dinitrophenol NA 16 UJ 3.3 U 430 UJ 3.3 U2-Methylphenol (O-cresol) NA 3.3 UJ 0.66 U 86 UJ 0.66 U4-Methylphenol (P-cresol) NA 3.3 UJ 0.66 U 86 UJ 0.66 U2-Nitrophenol NA 3.3 UJ 0.66 U 86 UJ 0.66 U4-Nitrophenol NA 16 UJ 3.3 U 430 UJ 3.3 UPentachlorophenol NA 16 UJ 3.3 U 430 UJ 3.3 UPhenol NA 3.3 UJ 0.66 U 86 UJ 0.66 U2,4,5-Trichlorophenol NA 3.3 UJ 0.66 U 86 UJ 0.66 U2,4,6-Trichlorophenol NA 3.3 UJ 0.66 U 86 UJ 0.66 UBenzyl butyl phthalate NA 3.3 UJ 0.66 U 86 UJ 0.66 UBis(2-chloroethoxy)methane NA 3.3 UJ 0.66 U 86 UJ 0.66 UBis(2-chloroethyl)ether NA 3.3 UJ 0.66 U 86 UJ 0.66 UBis(2-chloroisopropyl)ether NA 3.3 UJ 0.66 U 86 UJ 0.66 UBis(2-ethylhexyl)phthalate NA 3.3 UJ 0.66 U 86 UJ 0.66 U4-Bromophenyl phenyl ether NA 3.3 UJ 0.66 U 86 UJ 0.66 UCarbazole NA 3.3 UJ 0.66 U 86 UJ 0.66 U4-Chloroaniline NA 6.6 UJ 1.3 U 170 UJ 1.3 U2-Chloronaphthalene NA 3.3 UJ 0.66 U 86 UJ 0.66 U4-Chlorophenyl phenyl ether NA 3.3 UJ 0.66 U 86 UJ 0.66 UDibenzofuran NA 3.3 UJ 0.66 U 86 UJ 0.66 UDi-n-butyl phthalate NA 3.3 UJ 0.66 U 86 UJ 0.66 U1,2-Dichlorobenzene NA 3.3 UJ 0.66 U 86 UJ 0.66 U1,3-Dichlorobenzene NA 3.3 UJ 0.66 U 86 UJ 0.66 U1,4-Dichlorobenzene NA 3.3 UJ 0.66 U 86 UJ 0.66 U3,3-Dichlorobenzidine NA 6.6 UJ 1.3 U 170 UJ 1.3 UDiethyl phthalate NA 3.3 UJ 0.66 U 86 UJ 0.66 UDimethyl phthalate NA 3.3 UJ 0.66 U 86 UJ 0.66 U2,4-Dinitrotoluene NA 3.3 UJ 0.66 U 86 UJ 0.66 U2,6-Dinitrotoluene NA 3.3 UJ 0.66 U 86 UJ 0.66 UDi-n-octyl phthalate NA 3.3 UJ 0.66 U 86 UJ 0.66 UHexachlorobenzene NA 3.3 UJ 0.66 U 86 UJ 0.66 UNotes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.3) NA - Not analyzed.



Aurora MGP Site

Sample Location and Depth (feet below ground surface) ConcentrationSB02-005 SB05a-001 SB05a-002 SB15-002 SB20-002

Compound/Analyte 16-18 12-14 14-15 2-4 8-10TCL Semivolatiles (Continued) (mg/kg)

Hexachlorobutadiene NA 3.3 UJ 0.66 U 86 UJ 0.66 UHexachlorocyclopentadiene NA 3.3 UJ 0.66 U 86 UJ 0.66 UHexachloroethane NA 3.3 UJ 0.66 U 86 UJ 0.66 UIsophorone NA 3.3 UJ 0.66 U 86 UJ 0.66 U2-Methylnaphthalene NA 3.3 UJ 0.66 U 86 UJ 0.66 U2-Nitroaniline NA 16 UJ 3.3 U 430 UJ 3.3 U3-Nitroaniline NA 16 UJ 3.3 U 430 UJ 3.3 U4-Nitroaniline NA 16 UJ 1.3 U 170 UJ 1.3 UNitrobenzene NA 3.3 UJ 0.66 U 86 UJ 0.66 UN-nitrosodimethylamine NA 3.3 UJ 0.66 U 86 UJ 0.66 UN-nitrosodi-n-propylamine NA 3.3 UJ 0.66 U 86 UJ 0.66 UN-nitrosodiphenylamine NA 3.3 UJ 0.66 U 86 UJ 0.66 U1,2,4-Trichlorobenzene NA 3.3 UJ 0.66 U 86 UJ 0.66 UAcenaphthene NA 1.2 U 1.2 UJ 2100 J 1.20 UAcenaphthylene NA 1.54 U 1.54 UJ 4.0 UJ 1.54 UAnthracene NA 0.44 U 0.44 UJ 48.9 J 0.440 UBenzo(a)anthracene NA 0.0087 U 2 J 74.9 J 0.0087 UBenzo(b)fluoranthene NA 0.012 U 0.849 J 41.3 J 0.012 UBenzo(k)fluoranthene NA 0.011 U 0.415 J 35.2 J 0.011 UBenzo(a)pyrene NA 0.044 0.929 J 6.57 J 0.015 UBenzo(g,h,i)perylene NA 0.051 U 0.366 J 102 J 0.051 UChrysene NA 0.1 U 1.5 J 176 J 0.100 UDibenzo(a,h)anthracene NA 0.02 U 0.083 J 6.27 J 0.020 UFluoranthene NA 0.14 U 4.1 J 810 J 0.140 UFluorene NA 1.08 0.997 J 205 J 0.140 UIndeno(1,2,3-cd)pyrene NA 0.028 U 0.419 J 81.0 J 0.028 UNaphthalene NA 1.2 U 1.2 UJ 3700 J 1.20 UPhenanthrene NA 0.428 U 2 J 826 J 0.428 UPyrene NA 0.18 U 2.1 J 290 J 0.180 UNotes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.3) NA - Not analyzed.



Aurora MGP Site

Sample Location and Depth (feet below ground surface) ConcentrationCompound/Analyte SB21-003 SB22-001 SB24-003 SB25-002 SB26-003


Acetone 5.0 U 5.0 U 5.0 U 5.0 U 5.0 UBenzene 0.25 U 0.25 U 0.25 U 0.25 U 0.25 UBromodichloromethane 0.25 U 0.25 U 0.25 U 0.25 U 0.25 UBromoform 0.25 U 0.25 U 0.25 U 0.25 U 0.25 UBromomethane 0.5 U 0.50 U 0.50 U 0.50 U 0.50 U2-Butanone 5.0 U 5.0 U 5.0 U 5.0 U 5.0 UCarbon disulfide 5.0 U 5.0 U 5.0 U 5.0 U 5.0 UCarbon tetrachloride 0.25 U 0.25 U 0.25 U 0.25 U 0.25 UChlorobenzene 0.25 U 0.25 U 0.25 U 0.25 U 0.25 UChloroethane 0.50 U 0.50 U 0.50 U 0.50 U 0.50 UChloroform 0.25 U 0.25 U 0.25 U 0.25 U 0.25 UChloromethane 0.50 U 0.50 U 0.50 U 0.50 U 0.50 UChlorodibromomethane 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U1,1-Dichloroethane 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U1,2-Dichloroethane 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U1,1-Dichloroethene 0.25 U 0.25 U 0.25 U 0.25 U 0.25 Ucis-1,2-Dichloroethene 0.25 U 0.25 U 0.25 U 0.25 U 0.25 Utrans-1,2-Dichloroethene 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U1,2-Dichloropropane 0.25 U 0.25 U 0.25 U 0.25 U 0.25 Ucis-1,3-Dichloropropene 0.25 U 0.25 U 0.25 U 0.25 U 0.25 Utrans-1,3-Dichloropropene 0.25 U 0.25 U 0.25 U 0.25 U 0.25 UEthylbenzene 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U2-Hexanone 2.5 U 2.5 U 2.5 U 2.5 U 2.5 U4-Methyl-2-pentanone 2.5 U 2.5 U 2.5 U 2.5 U 2.5 UMethlene chloride 0.25 U 0.25 U 0.25 U 0.25 U 0.25 UStyrene 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U1,1,2,2-Tetrachloroethane 0.25 U 0.25 U 0.25 U 0.25 U 0.25 UTetrachloroethane 0.25 U 0.25 U 0.25 U 0.25 U 0.25 UToluene 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U1,1,1-Trichloroethane 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U1,1,2-Trichloroethane 0.25 U 0.25 U 0.25 U 0.25 U 0.25 UTrichloroethene 0.25 U 0.25 U 0.25 U 0.25 U 0.25 UVinly chloride 0.50 U 0.50 U 0.50 U 0.50 U 0.50 UXylenes (total) 0.25 U 0.25 U 0.25 U 0.25 U 0.25 UNote:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.



Aurora MGP Site

Sample Location and Depth (feet below ground surface) ConcentrationSB21-003 SB22-001 SB24-003 SB25-002 SB26-003

Compound/Analyte 26-28 12-14 16-18 18-20 6-8TCL Semivolatiles (mg/kg)

4-Chloro-3-methylphenol 1.3 U 1.3 U 3.3 UJ 1.3 U NA2-Chlorophenol 0.66 U 0.66 U 3.3 UJ 0.66 U NA2,4-Dichlorophenol 0.66 U 0.66 U 3.3 UJ 0.66 U NA2,4-Dimethylphenol 0.66 U 0.66 U 3.3 UJ 0.66 U NA2,4-Dinitrophenol 3.3 UR 3.3 U 16 UJ 3.3 U NA2-Methyl-4,6-dinitrophenol 3.3 U 3.3 U 16 UJ 3.3 U NA2-Methylphenol (O-cresol) 0.66 U 0.66 U 3.3 UJ 0.66 U NA4-Methylphenol (P-cresol) 0.66 U 0.66 U 3.3 UJ 0.66 U NA2-Nitrophenol 0.66 U 0.66 U 3.3 UJ 0.66 U NA4-Nitrophenol 3.3 U 3.3 U 16 UJ 3.3 U NAPentachlorophenol 3.3 U 3.3 U 16 UJ 3.3 U NAPhenol 0.66 U 0.66 U 3.3 UJ 0.66 U NA2,4,5-Trichlorophenol 0.66 U 0.66 U 3.3 UJ 0.66 U NA2,4,6-Trichlorophenol 0.66 U 0.66 U 3.3 UJ 0.66 U NABenzyl butyl phthalate 0.66 U 0.66 U 3.3 UJ 0.66 U NABis(2-chloroethoxy)methane 0.66 U 0.66 U 3.3 UJ 0.66 UR NABis(2-chloroethyl)ether 0.66 U 0.66 U 3.3 UJ 0.66 UR NABis(2-chloroisopropyl)ether 0.66 U 0.66 U 3.3 UJ 0.66 U NABis(2-ethylhexyl)phthalate 0.66 U 0.66 U 3.3 UJ 0.66 U NA4-Bromophenyl phenyl ether 0.66 U 0.66 U 3.3 UJ 0.66 UR NACarbazole 0.66 U 0.66 U 3.3 UJ 0.66 U NA4-Chloroaniline 1.3 U 1.3 U 6.6 UJ 1.3 U NA2-Chloronaphthalene 0.66 U 0.66 U 3.3 UJ 0.66 U NA4-Chlorophenyl phenyl ether 0.66 U 0.66 U 3.3 UJ 0.66 U NADibenzofuran 0.66 U 0.66 U 3.3 UJ 0.66 U NADi-n-butyl phthalate 0.66 U 0.66 U 3.3 UJ 0.66 U NA1,2-Dichlorobenzene 0.66 U 0.66 U 3.3 UJ 0.66 U NA1,3-Dichlorobenzene 0.66 U 0.66 U 3.3 UJ 0.66 U NA1,4-Dichlorobenzene 0.66 U 0.66 U 3.3 UJ 0.66 U NA3,3-Dichlorobenzidine 1.3 U 1.3 U 6.6 UJ 1.3 U NADiethyl phthalate 0.66 U 0.66 U 3.3 UJ 0.66 U NADimethyl phthalate 0.66 U 0.66 U 3.3 UJ 0.66 U NA2,4-Dinitrotoluene 0.66 U 0.66 U 3.3 UJ 0.66 U NA2,6-Dinitrotoluene 0.66 U 0.66 U 3.3 UJ 0.66 U NADi-n-octyl phthalate 0.66 U 0.66 U 3.3 UJ 0.66 U NAHexachlorobenzene 0.66 U 0.66 U 3.3 UJ 0.66 U NANotes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.3) R - The result is unusable. The compound/analyte may or may not be present.4) NA - Not analyzed.



Aurora MGP Site

Sample Location and Depth (feet below ground surface) ConcentrationSB21-003 SB22-001 SB24-003 SB25-002 SB26-003

Compound/Analyte 26-28 12-14 16-18 18-20 6-8TCL Semivolatiles (Continued) (mg/kg)

Hexachlorobutadiene 0.66 U 0.66 U 3.3 UJ 0.66 U NAHexachlorocyclopentadiene 0.66 U 0.66 U 3.3 UJ 0.66 U NAHexachloroethane 0.66 U 0.66 U 3.3 UJ 0.66 U NAIsophorone 0.66 U 0.66 U 3.3 UJ 0.66 U NA2-Methylnaphthalene 0.66 U 0.66 U 3.3 UJ 0.66 U NA2-Nitroaniline 3.3 U 3.3 U 16 UJ 3.3 U NA3-Nitroaniline 3.3 U 3.3 U 16 UJ 3.3 U NA4-Nitroaniline 1.3 U 1.3 U 6.6 UJ 1.3 U NANitrobenzene 0.66 U 0.66 U 3.3 UJ 0.66 UR NAN-nitrosodimethylamine 0.66 U 0.66 U 3.3 UJ 0.66 U NAN-nitrosodi-n-propylamine 0.66 U 0.66 U 3.3 UJ 0.66 U NAN-nitrosodiphenylamine 0.66 U 0.66 U 3.3 UJ 0.66 U NA1,2,4-Trichlorobenzene 0.66 U 0.66 U 3.3 UJ 0.66 U NAAcenaphthene 1.20 U 1.20 U 1.20 UJ 1.2 U NAAcenaphthylene 1.54 U 1.54 U 1.54 UJ 1.54 U NAAnthracene 0.440 U 0.440 U 0.440 UJ 0.44 U NABenzo(a)anthracene 0.091 0.0087 U 0.339 J 0.181 U NABenzo(b)fluoranthene 0.034 0.012 U 0.129 J 0.1 U NABenzo(k)fluoranthene 0.023 0.011 U 0.011 UJ 0.148 U NABenzo(a)pyrene 0.082 0.015 U 0.072 J 0.112 U NABenzo(g,h,i)perylene 0.051 U 0.051 U 0.051 UJ 0.1 U NAChrysene 0.100 U 0.100 U 0.380 J 0.1 U NADibenzo(a,h)anthracene 0.020 U 0.020 U 0.020 UJ 0.06 U NAFluoranthene 0.140 U 0.140 U 0.696 J 0.14 UR NAFluorene 0.279 0.140 U 0.140 UJ 0.14 U NAIndeno(1,2,3-cd)pyrene 0.028 U 0.028 U 0.028 UJ 0.096 U NANaphthalene 1.20 U 1.20 U 1.20 UJ 1.2 UR NAPhenanthrene 0.453 0.428 U 0.428 UJ 0.428 U NAPyrene 0.180 U 0.180 U 0.209 J 0.223 U NANotes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.3) R - The result is unusable. The compound/analyte may or may not be present.4) NA - Not analyzed.



Aurora MGP Site

Sample Location and Depth (feet below ground surface) ConcentrationCompound/Analyte SB26-004 SB26-005 SB26-006 SB27a-002 SB28a-002 SB29a-002

8-12 12-14 18-20 18-20 6-8 8-10TCL Volatiles (mg/kg)

Acetone NA NA 5.0 U 5.0 U 5.0 U 5.0 UBenzene NA NA 0.25 U 0.25 U 0.25 U 0.25 UBromodichloromethane NA NA 0.25 U 0.25 U 0.25 U 0.25 UBromoform NA NA 0.25 U 0.25 U 0.25 U 0.25 UBromomethane NA NA 0.50 U 0.50 U 0.50 U 0.50 U2-Butanone NA NA 5.0 U 5.0 U 5.0 U 5.0 UCarbon disulfide NA NA 5.0 U 5.0 U 5.0 U 5.0 UCarbon tetrachloride NA NA 0.25 U 0.25 U 0.25 U 0.25 UChlorobenzene NA NA 0.25 U 0.25 U 0.25 U 0.25 UChloroethane NA NA 0.50 U 0.50 U 0.50 U 0.50 UChloroform NA NA 0.25 U 0.25 U 0.25 U 0.25 UChloromethane NA NA 0.50 U 0.50 U 0.50 U 0.50 UChlorodibromomethane NA NA 0.25 U 0.25 U 0.25 U 0.25 U1,1-Dichloroethane NA NA 0.25 U 0.25 U 0.25 U 0.25 U1,2-Dichloroethane NA NA 0.25 U 0.25 U 0.25 U 0.25 U1,1-Dichloroethene NA NA 0.25 U 0.25 U 0.25 U 0.25 Ucis-1,2-Dichloroethene NA NA 0.25 U 0.25 U 0.25 U 0.25 Utrans-1,2-Dichloroethene NA NA 0.25 U 0.25 U 0.25 U 0.25 U1,2-Dichloropropane NA NA 0.25 U 0.25 U 0.25 U 0.25 Ucis-1,3-Dichloropropene NA NA 0.25 U 0.25 U 0.25 U 0.25 Utrans-1,3-Dichloropropene NA NA 0.25 U 0.25 U 0.25 U 0.25 UEthylbenzene NA NA 0.25 U 0.25 U 0.25 U 0.25 U2-Hexanone NA NA 2.5 U 2.5 U 2.5 U 2.5 U4-Methyl-2-pentanone NA NA 2.5 U 2.5 U 2.5 U 2.5 UMethlene chloride NA NA 0.25 U 0.25 U 0.25 U 0.25 UStyrene NA NA 0.25 U 0.25 U 0.25 U 0.25 U1,1,2,2-Tetrachloroethane NA NA 0.25 U 0.25 U 0.25 U 0.25 UTetrachloroethane NA NA 0.25 U 0.25 U 0.25 U 0.25 UToluene NA NA 0.25 U 0.25 U 0.25 U 0.25 U1,1,1-Trichloroethane NA NA 0.25 U 0.25 U 0.25 U 0.25 U1,1,2-Trichloroethane NA NA 0.25 U 0.25 U 0.25 U 0.25 UTrichloroethene NA NA 0.25 U 0.25 U 0.25 U 0.25 UVinly chloride NA NA 0.50 U 0.50 U 0.50 U 0.50 UXylenes (total) NA NA 0.25 U 0.25 U 0.25 U 0.25 UNotes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) NA - Not analyzed.



Aurora MGP Site

Sample Location and Depth (feet below ground surface) ConcentrationSB26-004 SB26-005 SB26-006 SB27a-002 SB28a-002 SB29a-002

Compound/Analyte 8-12 12-14 18-20 18-20 6-8 8-10TCL Semivolatiles (mg/kg)

4-Chloro-3-methylphenol 6.6 UJ 6.6 UJ 6.6 UJ 6.6 UJ 1.3 U 1.3 U2-Chlorophenol 3.3 UJ 3.3 UJ 3.3 UJ 3.3 UJ 0.66 U 0.66 U2,4-Dichlorophenol 3.3 UJ 3.3 UJ 3.3 UJ 3.3 UJ 0.66 U 0.66 U2,4-Dimethylphenol 3.3 UJ 3.3 UJ 3.3 UJ 3.3 UJ 0.66 U 0.66 U2,4-Dinitrophenol 16 UJ 16 UJ 16 UJ 16 UJ 3.3 U 3.3 UR2-Methyl-4,6-dinitrophenol 16 UJ 16 UJ 16 UJ 16 UJ 3.3 U 3.3 U2-Methylphenol (O-cresol) 3.3 UJ 3.3 UJ 3.3 UJ 3.3 UJ 0.66 U 0.66 U4-Methylphenol (P-cresol) 3.3 UJ 3.3 UJ 3.3 UJ 3.3 UJ 0.66 U 0.66 U2-Nitrophenol 3.3 UJ 3.3 UJ 3.3 UJ 3.3 UJ 0.66 U 0.66 U4-Nitrophenol 16 UJ 16 UJ 16 UJ 16 UJ 3.3 U 3.3 UPentachlorophenol 16 UJ 16 UJ 16 UJ 16 UJ 3.3 U 3.3 UPhenol 3.3 UJ 3.3 UJ 3.3 UJ 3.3 UJ 0.66 U 0.66 U2,4,5-Trichlorophenol 3.3 UJ 3.3 UJ 3.3 UJ 3.3 UJ 0.66 U 0.66 U2,4,6-Trichlorophenol 3.3 UJ 3.3 UJ 3.3 UJ 3.3 UJ 0.66 U 0.66 UBenzyl butyl phthalate 3.3 UJ 3.3 UJ 3.3 UJ 3.3 UJ 0.66 U 0.66 UBis(2-chloroethoxy)methane 3.3 UJ 3.3 UJ 3.3 UJ 3.3 UJ 0.66 U 0.66 UBis(2-chloroethyl)ether 3.3 UJ 3.3 UJ 3.3 UJ 3.3 UJ 0.66 U 0.66 UBis(2-chloroisopropyl)ether 3.3 UJ 3.3 UJ 3.3 UJ 3.3 UJ 0.66 U 0.66 UBis(2-ethylhexyl)phthalate 3.3 UJ 3.3 UJ 3.3 UJ 3.3 UJ 0.66 U 0.66 U4-Bromophenyl phenyl ether 3.3 UJ 3.3 UJ 3.3 UJ 3.3 UJ 0.66 U 0.66 UCarbazole 3.3 UJ 3.3 UJ 3.3 UJ 3.3 UJ 0.66 U 0.66 U4-Chloroaniline 6.6 UJ 6.6 UJ 6.6 UJ 6.6 UJ 1.3 U 1.3 U2-Chloronaphthalene 3.3 UJ 3.3 UJ 3.3 UJ 3.3 UJ 0.66 U 0.66 U4-Chlorophenyl phenyl ether 3.3 UJ 3.3 UJ 3.3 UJ 3.3 UJ 0.66 U 0.66 UDibenzofuran 3.3 UJ 3.3 UJ 3.3 UJ 3.3 UJ 0.66 U 0.66 UDi-n-butyl phthalate 3.3 UJ 3.3 UJ 3.3 UJ 3.3 UJ 0.66 U 0.66 U1,2-Dichlorobenzene 3.3 UJ 3.3 UJ 3.3 UJ 3.3 UJ 0.66 U 0.66 U1,3-Dichlorobenzene 3.3 UJ 3.3 UJ 3.3 UJ 3.3 UJ 0.66 U 0.66 U1,4-Dichlorobenzene 3.3 UJ 3.3 UJ 3.3 UJ 3.3 UJ 0.66 U 0.66 U3,3-Dichlorobenzidine 6.6 UJ 6.6 UJ 6.6 UJ 6.6 UJ 1.3 U 1.3 UDiethyl phthalate 3.3 UJ 3.3 UJ 3.3 UJ 3.3 UJ 0.66 U 0.66 UDimethyl phthalate 3.3 UJ 3.3 UJ 3.3 UJ 3.3 UJ 0.66 U 0.66 U2,4-Dinitrotoluene 3.3 UJ 3.3 UJ 3.3 UJ 3.3 UJ 0.66 U 0.66 U2,6-Dinitrotoluene 3.3 UJ 3.3 UJ 3.3 UJ 3.3 UJ 0.66 U 0.66 UDi-n-octyl phthalate 3.3 UJ 3.3 UJ 3.3 UJ 3.3 UJ 0.66 U 0.66 UHexachlorobenzene 3.3 UJ 3.3 UJ 3.3 UJ 3.3 UJ 0.66 U 0.66 UNotes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.3) R - The result is unusable. The compound/analyte may or may not be present.



Aurora MGP Site

Sample Location and Depth (feet below ground surface) ConcentrationSB26-004 SB26-005 SB26-006 SB27a-002 SB28a-002 SB29a-002

Compound/Analyte 8-12 12-14 18-20 18-20 6-8 8-10TCL Semivolatiles (Continued) (mg/kg)

Hexachlorobutadiene 3.3 UJ 3.3 UJ 3.3 UJ 3.3 UJ 0.66 U 0.66 UHexachlorocyclopentadiene 3.3 UJ 3.3 UJ 3.3 UJ 3.3 UJ 0.66 U 0.66 UHexachloroethane 3.3 UJ 3.3 UJ 3.3 UJ 3.3 UJ 0.66 U 0.66 UIsophorone 3.3 UJ 3.3 UJ 3.3 UJ 3.3 UJ 0.66 U 0.66 U2-Methylnaphthalene 11 J 3.3 UJ 3.3 UJ 3.3 UJ 0.66 U 0.66 U2-Nitroaniline 16 UJ 16 UJ 16 UJ 16 UJ 3.3 U 3.3 U3-Nitroaniline 16 UJ 16 UJ 16 UJ 16 UJ 3.3 U 3.3 U4-Nitroaniline 6.6 UJ 6.6 UJ 6.6 UJ 6.6 UJ 1.3 U 1.3 UNitrobenzene 3.3 UJ 3.3 UJ 3.3 UJ 3.3 UJ 0.66 U 0.66 UN-nitrosodimethylamine 3.3 UJ 3.3 UJ 3.3 UJ 3.3 UJ 0.66 U 0.66 UN-nitrosodi-n-propylamine 3.3 UJ 3.3 UJ 3.3 UJ 3.3 UJ 0.66 U 0.66 UN-nitrosodiphenylamine 3.3 UJ 3.3 UJ 3.3 UJ 3.3 UJ 0.66 U 0.66 U1,2,4-Trichlorobenzene 3.3 UJ 3.3 UJ 3.3 UJ 3.3 UJ 0.66 U 0.66 UAcenaphthene 8.80 J 8.0 J 2.2 J 1.20 U 1.20 U 1.20 UAcenaphthylene 1.54 UJ 1.54 UJ 1.54 UJ 1.54 U 1.54 U 1.54 UAnthracene 23.0 J 13.0 J 3.8 J 0.440 U 0.440 U 0.440 UBenzo(a)anthracene 6.0 J 5.8 J 1.0 J 0.0087 U 0.181 U 0.181 UBenzo(b)fluoranthene 3.2 J 3.7 J 1.1 J 0.012 U 0.100 U 0.100 UBenzo(k)fluoranthene 2.2 J 2.2 J 0.437 J 0.011 U 0.148 U 0.148 UBenzo(a)pyrene 4.3 J 3.8 J 0.266 J 0.015 U 0.112 U 0.112 UBenzo(g,h,i)perylene 1.6 J 0.889 J 0.108 J 0.051 U 0.100 U 0.100 UChrysene 7.5 J 6.5 J 0.726 J 0.100 U 0.100 U 0.100 UDibenzo(a,h)anthracene 0.551 J 0.408 J 0.35 UJ 0.020 U 0.060 U 0.060 UFluoranthene 17.3 J 11.1 J 3.1 J 0.140 U 0.140 U 0.140 UFluorene 11.3 J 0.140 UJ 2.0 J 0.140 U 0.140 U 0.140 UIndeno(1,2,3-cd)pyrene 0.882 J 0.646 J 0.35 UJ 0.028 U 0.096 U 0.096 UNaphthalene 1.20 UJ 1.20 UJ 1.20 UJ 1.20 U 1.20 U 1.20 UPhenanthrene 1.2 J 0.490 J 0.428 UJ 0.428 U 0.428 U 0.428 UPyrene 20.4 J 12.4 J 2.8 J 0.180 U 0.223 U 0.223 UNotes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.


Table B-4SI Potential Source Material Analytical Results

Aurora MGP Site

Sample Location and Depth (feet below ground surface)/ConcentrationSB07-002 SB07-003 SB08-003 SB09-003 SB11-002 SB15-002 SB16a-004 SP51-001

Analyte/Parameter (Units) 8-10 10-11 16-18 10-12 8-10 18-20 34-38 8-12Miscellaneous Analyses

Flashpoint (Degree F) >200 124 >200 NA NA NA >200 >200BTU (BTU/lb) 6889 6706 NA 4420 8700 3500 5810 7620Cyanide, Reactive (µg/g) 50 U 50 U 50 U 50 U 50 U 50 U 50 U 50 UMoisture, Karl Fischer (%) 14.4 20.0 26.6 33.9 32.7 35.7 16.4 16.2Oil & Grease (%) 1.7 0.31 0.35 2.7 0.39 0.48 0.10 U 0.24Sulfide, Reactive (µg/g) 50 U 50 U 50 U 671 10 U 10 U 50 U 50 U

Inorganic Toxicity Characteristic Leaching Procedure (mg/l)Arsenic 0.0131 0.0144 0.0246 0.0050 U 0.20 U 0.20 U 0.0050 U 0.0050 UBarium 0.415 0.427 0.675 1.04 0.089 0.098 0.378 0.790Cadmium 0.060 0.050 0.010 U 0.010 U 0.010 U 0.010 U 0.010 U 0.010 UChromium 0.040 U 0.040 U 0.040 U 0.040 U 0.040 U 0.040 U 0.040 U 0.040 ULead 0.0050 U 0.0050 U 0.0050 U 0.0050 U 0.0050 U 0.327 0.0050 U 0.0050 UMercury 0.0004 U 0.0004 U 0.0004 U 0.0004 U 0.0004 U 0.0004 U 0.0004 U 0.0004 USelenium 0.0050 U 0.0050 U 0.010 U 0.005 U 0.20 U 0.20 U 0.0050 U 0.0050 USilver 0.040 U 0.040 U 0.040 U 0.040 U 0.040 U 0.040 U 0.040 U 0.040 U

Volatile Toxicity Characteristic Leaching Procedure (mg/l)Benzene 5.1 3.4 0.32 2.1 NA NA 0.020 U 0.020 UCarbon Tetrachloride 0.020 U 0.020 U 0.020 U 0.10 U NA NA 0.020 U 0.020 UChlorobenzene 0.020 U 0.020 U 0.020 U 0.10 U NA NA 0.020 U 0.020 UChloroform 0.020 U 0.020 U 0.020 U 0.10 U NA NA 0.020 U 0.020 U1,4-Dichlorobenzene 0.020 U 0.020 U 0.020 U 0.10 U NA NA 0.020 U 0.020 U1,2-Dichloroethane 0.020 U 0.020 U 0.020 U 0.10 U NA NA 0.020 U 0.020 U1,1-Dichloroethene 0.020 U 0.020 U 0.020 U 0.10 U NA NA 0.020 U 0.020 UMethyl Ethyl Ketone 0.40 U 0.40 U 0.40 U 2.0 U NA NA 0.40 U 0.40 UTetrachloroethene 0.020 U 0.540 0.020 U 0.10 U NA NA 0.020 U 0.020 UTrichloroethene 0.020 U 0.020 U 0.02 U 0.10 U NA NA 0.020 U 0.020 UVinyl chloride 0.020 U 0.020 U 0.02 U 0.10 U NA NA 0.020 U 0.020 U

BNA Toxicity Characteristic Leaching Procedure (mg/l)Cresols 0.10 U 0.10 U 0.10 U 2.1 U 0.10 U 0.10 U 0.10 U 0.10 U3-Methylphenol (m-cresol) 0.10 U 0.10 U 0.10 U 0.1 U 0.10 U 0.10 U 0.10 U 0.10 U2-Methylphenol (o-cresol) 0.10 U 0.10 U 0.10 U 0.1 U 0.10 U 0.10 U 0.10 U 0.10 U4-Methylphenol (p-cresol) 0.10 U 0.10 U 0.10 U 0.1 U 0.10 U 0.10 U 0.10 U 0.10 UPentachlorophenol 0.50 U 0.50 U 0.50 U 0.1 U 0.50 U 0.50 U 0.50 U 0.50 U2,4,5-Trichlorophenol 0.50 U 0.50 U 0.50 U 0.1 U 0.50 U 0.50 U 0.50 U 0.50 U2,4,6-Trichlorophenol 0.10 U 0.10 U 0.10 U NA 0.10 U 0.10 U 0.10 U 0.10 U1,4-Dichlorobenzene 0.10 U 0.10 U 0.10 U NA 0.10 U 0.10 U 0.10 U 0.10 UHexachloroethane 0.10 U 0.10 U 0.10 U NA 0.10 U 0.10 U 0.10 U 0.10 UNitrobenzene 0.10 U 0.10 U 0.10 U NA 0.1 U 0.10 U 0.10 U 0.10 UHexachlororbutadiene 0.10 U 0.10 U 0.10 U NA 0.1 U 0.10 U 0.10 U 0.10 U2,4-Dinitrotoluene 0.10 U 0.10 U 0.10 U NA 0.1 U 0.10 U 0.10 U 0.10 UHexachlorobenzene 0.10 U 0.10 U 0.10 U NA 0.1 U 0.10 U 0.10 U 0.10 UPyridine 0.10 U 0.10 U 0.10 U NA 0.1 U 0.10 U 0.10 U 0.10 UNotes:1) NA - Not analyzed.2) U - Compound/analyte not detected. The associated numerical value is the reporting limit.


Table B-5SI Subsurface Soil Total Petroleum Hydrocarbons Analytical Results

Aurora MGP Site

Sample Location and Depth (feet below ground surface)/ConcentrationSB05a-002 SB18-002 SB18-003 SB19-002 SB19-004 SB19-003

Parameter 14-15 14-16 26-28 12-14 16-18 24-26TPH (mg/kg)

Gas 10 U 10 U 10 U 10 U 10 U 10 UDiesel 941 10 U 10 U 9400 10 U 10 UOil 10 U 10 U 10 U 10 U 10 U 10 UNotes:1) U - Parameter not detected. The associated numerical value is the reporting limit.


Table B-5 (Continued)SI Subsurface Soil Total Petroleum Hydrocarbons Analytical Results

Aurora MGP Site


Parameter 8-10 26-28 14-16 18-20 18-20TPH (mg/kg)

Gas 10 U 10 U 10 U 10 U 10 UDiesel 10 U 10 U 2500 1300 620Oil 10 U 10 U 10 U 10 U 10 UNotes:1) U - Parameter not detected. The associated numerical value is the reporting limit.


Table B-6SI Subsurface Soil RCRA Characteristics Analytical Results

Aurora MGP Site

Sample Location and Depth (feet below ground surface)/ConcentrationSB07 SB08 SB09 SB11 SB15 SB16a Regulatory

Parameter (Units) 10-11 16-18 10-12 8-10 18-20 34-38 LimitMiscellaneous Analyses

Flashpoint (Degree F) 124 >200 NA NA NA >200 <140 *Heat of Combustion (BTU/lb) 6,706 NA 4,420 8,700 3,500 5,810 NoneCyanide, Reactive (mg/kg) 50 U 50 U 50 U 50 U 50 U 50 U 250 **Moisture, Karl Fischer (%) 14.4 26.6 33.9 32.7 35.7 16.4 NoneSulfide, Reactive (mg/kg) 50 U 50 U 671 10 U 50 U 50 U 500 **Oil & Grease (%) 0.31 0.35 2.7 0.39 0.48 0.10 U

Toxicity Characteristic Leaching Procedure (TCLP) AnalysesArsenic (mg/l) 0.0144 0.0246 0.0050 U 0.20 U 0.20 U 0.0050 U 5.0 *Barium (mg/l) 0.427 0.675 1.04 0.089 0.098 0.378 100.0 *Lead (mg/l) 0.0050 0.0050 U 0.0050 U 0.0050 U 0.327 0.0050 U 5.0 *Mercury (mg/l) 0.0004 U 0.0004 U 0.0004 U 0.0004 U 0.0004 U 0.0004 U 0.2 *Benzene (mg/l) 3.4 0.32 2.1 -- -- 0.020 U 0.5 *Notes:1. * USEPA RCRA hazardous waste characteristic limit.2. ** Illinois EPA special waste guidance regulation.3. U - Analyte/compound not detected. The associated numerical value is the reporting limit.4. Analytes not detected in all samples are omitted from this summary table.5. NA - Not analyzed.


Table B-7 SI Groundwater Analytical Results

Aurora MGP Site

Sample Location/ConcentrationSMW01 SMW02 SMW03 SMW05 SMW06 SMW07

Compound/AnalyteBTEX / Styrene (mg/l)


Phenols (mg/l)2,4-Dimethylphenol 0.010 U 0.010 U 0.010 U 0.010 U 0.010 U 0.010 U2-Methylphenol (O-cresol) 0.010 U 0.010 U 0.010 U 0.010 U 0.010 U 0.010 U4-Methylphenol (P-cresol) 0.010 U 0.010 U 0.010 U 0.010 U 0.010 U 0.010 UPhenol 0.010 U 0.010 U 0.010 U 0.010 U 0.010 U 0.010 U

PAHs (mg/l)Acenaphthene 0.018 UJ 0.018 U 0.018 U 0.018 U 0.018 U NAAcenaphthylene 0.023 UJ 0.023 U 0.023 U 0.023 U 0.023 U NAAnthracene 0.0066 UJ 0.0066 U 0.0066 U 0.0066 U 0.0066 U NABenzo(a)anthracene 0.0001 UJ 0.0001 U 0.0001 U 0.0001 U 0.0001 U NABenzo(b)fluoranthene 0.0002 UJ 0.0002 U 0.0002 U 0.0002 U 0.0002 U NABenzo(k)fluoranthene 0.0002 UJ 0.0002 U 0.0002 U 0.0002 U 0.0002 U NABenzo(a)pyrene 0.0002 UJ 0.0002 U 0.0002 U 0.0002 U 0.0002 U NABenzo(g,h,i)perylene 0.0008 UJ 0.0008 U 0.0008 U 0.0008 U 0.0008 U NAChrysene 0.0015 UJ 0.0015 U 0.0015 U 0.0015 U 0.0015 U NADibenzo(a,h)anthracene 0.0008 UJ 0.0008 U 0.0003 U 0.0003 U 0.0003 U NAFluoranthene 0.0021 UJ 0.0021 U 0.0021 U 0.0021 U 0.0021 U NAFluorene 0.0021 UJ 0.0021 U 0.0021 U 0.0021 U 0.0021 U NAIndeno(1,2,3-cd)pyrene 0.0004 UJ 0.0004 U 0.0004 U 0.0004 U 0.0004 U NANaphthalene 0.018 UJ 0.018 U 0.018 U 0.018 U 0.018 U NAPhenanthrene 0.0064 UJ 0.0064 U 0.0064 U 0.0064 U 0.0064 U NAPyrene 0.0027 UJ 0.0027 U 0.0027 U 0.0027 U 0.0027 U NADibenzofuran 0.010 U 0.010 U 0.010 U 0.010 U 0.010 U 0.010 U2-Methylnaphthalene 0.010 U 0.010 U 0.010 U 0.010 U 0.010 U 0.010 U

RCRA Metals and Cyanide (mg/l)Arsenic 0.033 0.016 0.013 0.0090 0.118 0.018Barium 0.232 0.251 0.277 0.315 0.636 1.860Cadmium 0.0040 U 0.0040 U 0.0040 U 0.0040 U 0.0040 U 0.0040 UChromium 0.074 0.040 1.820 0.047 0.834 0.513Lead 0.082 0.042 U 0.060 0.157 0.306 0.336Mercury 0.00020 U 0.00020 U 0.00030 0.00020 U 0.00050 0.00070Selenium 0.075 U 0.075 U 0.075 U 0.075 U 0.075 U 0.075 USilver 0.010 U 0.010 U 0.010 U 0.010 U 0.010 U 0.010 UCyanide 0.010 U 0.010 U 0.010 U 0.010 U 0.010 U 0.010 UNotes1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.3) NA - Not analyzed.


Table B-7 (Continued) SI Groundwater Analytical Results

Aurora MGP Site

Sample Location/ConcentrationSMW08 SMW09 DMW01 DMW02 DMW03 DMW04


Benzene 0.0050 U 0.014 0.140 0.0050 U 0.0050 U 0.0050 UEthylbenzene 0.0050 U 0.410 0.130 0.0050 U 0.0050 U 0.0050 UToluene 0.0050 U 0.026 0.220 0.0050 U 0.0050 U 0.0050 UXylenes (total) 0.0050 U 0.300 0.550 0.0050 U 0.0050 U 0.0050 UStyrene 0.0050 U 0.0050 U 0.290 0.0050 U 0.0050 U 0.0050 U

Phenols (mg/l)2,4-Dimethylphenol 0.010 U 0.100 UJ 0.010 U 0.010 U 0.010 U 0.010 U2-Methylphenol (O-cresol) 0.010 U 0.100 UJ 0.010 U 0.010 U 0.010 U 0.010 U4-Methylphenol (P-cresol) 0.010 U 0.100 UJ 0.010 U 0.010 U 0.010 U 0.010 UPhenol 0.010 U 0.100 UJ 0.010 U 0.010 U 0.010 U 0.010 U

PAHs (mg/l)Acenaphthene 0.018 U 0.018 UJ 0.018 UJ 0.018 U 0.018 U 0.018 UAcenaphthylene 0.023 U 0.023 UJ 0.023 UJ 0.023 U 0.023 U 0.023 UAnthracene 0.0066 U 0.0635 J 0.0082 J 0.0066 U 0.0066 U 0.0066 UBenzo(a)anthracene 0.0001 U 0.0064 J 0.0003 J 0.0001 U 0.0001 U 0.0001 UBenzo(b)fluoranthene 0.0002 U 0.0019 J 0.0002 UJ 0.0002 U 0.0002 U 0.0002 UBenzo(k)fluoranthene 0.0002 U 0.0013 J 0.0002 UJ 0.0002 U 0.0002 U 0.0002 UBenzo(a)pyrene 0.0002 U 0.00473 J 0.0002 UJ 0.0002 U 0.0002 U 0.0002 UBenzo(g,h,i)perylene 0.0008 U 0.0031 J 0.0008 UJ 0.0008 U 0.0008 U 0.0008 UChrysene 0.0015 U 0.0044 J 0.0015 UJ 0.0015 U 0.0015 U 0.0015 UDibenzo(a,h)anthracene 0.0003 U 0.00042 J 0.0003 UJ 0.0003 U 0.0003 U 0.0003 UFluoranthene 0.0021 U 0.0366 J 0.0021 UJ 0.0021 U 0.0021 U 0.0021 UFluorene 0.0021 U 0.115 J 0.0021 UJ 0.0021 U 0.0021 U 0.0021 UIndeno(1,2,3-cd)pyrene 0.0004 U 0.0018 J 0.0004 UJ 0.0004 U 0.0004 U 0.0004 UNaphthalene 0.018 U 0.018 UJ 0.018 UJ 0.018 U 0.018 U 0.018 UPhenanthrene 0.0064 U 0.158 J 0.0192 J 0.0064 U 0.0064 U 0.0064 UPyrene 0.0027 U 0.0271 J 0.0027 UJ 0.0027 U 0.0027 U 0.0027 UDibenzofuran 0.010 U 0.100 UJ 0.100 UJ 0.010 U 0.010 U 0.010 U2-Methylnaphthalene 0.010 U 0.740 J 0.250 J 0.010 U 0.010 U 0.010 U

RCRA Metals and Cyanide (mg/l)Arsenic 0.0050 U 0.053 0.0060 0.0050 U 0.012 0.0050 UBarium 0.425 0.328 0.078 0.123 0.205 75Cadmium 0.0040 U 0.0040 U 0.0040 U 0.0040 U 0.0040 U 0.0040 UChromium 0.0070 U 0.088 0.0070 U 0.0070 U 0.056 0.0070 ULead 0.074 0.114 0.042 U 0.042 U 0.042 U 0.042 UMercury 0.00020 U 0.00020 U 0.00020 U 0.00020 U 0.00020 U 0.00020 USelenium 0.075 U 0.075 U 0.075 U 0.075 U 0.075 U 0.075 USilver 0.010 U 0.01 U 0.010 U 0.010 U 0.010 U 0.010 UCyanide 0.010 U 0.01 U 0.010 U 0.010 U 0.010 U 0.010 UNotes1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.


Table B-7 (Continued) SI Groundwater Analytical Results

Aurora MGP Site

Sample Location/ConcentrationDMW07 DMW08 DMW09


Benzene 4.8 11 0.5Ethylbenzene 1.3 3.8 0.027Toluene 3.7 9.5 0.031Xylenes (total) 2.1 3.9 0.037Styrene 7.2 0.005 U 0.005 U

Phenols (mg/l)2,4-Dimethylphenol 0.100 UJ 0.100 UJ 0.010 U2-Methylphenol (O-cresol) 0.100 UJ 0.100 UJ 0.010 U4-Methylphenol (P-cresol) 0.100 UJ 0.100 UJ 0.010 UPhenol 0.100 UJ 0.100 UJ 0.010 U

PAHs (mg/l)Acenaphthene 0.018 UJ 24 J 0.018 UAcenaphthylene 0.023 UJ 190 J 0.023 UAnthracene 0.0066 UJ 105 J 0.0066 UBenzo(a)anthracene 0.0001 UJ 41 J 0.0001 UBenzo(b)fluoranthene 0.0002 UJ 8.7 J 0.0002 UBenzo(k)fluoranthene 0.0002 UJ 9.1 J 0.0002 UBenzo(a)pyrene 0.0002 UJ 24 J 0.0002 UBenzo(g,h,i)perylene 0.0008 UJ 6 J 0.0008 UChrysene 0.0015 UJ 26 J 0.0015 UDibenzo(a,h)anthracene 0.0003 UJ 1.6 J 0.0003 UFluoranthene 0.0021 UJ 82 J 0.0021 UFluorene 0.0021 UJ 1 UJ 0.0021 UIndeno(1,2,3-cd)pyrene 0.0004 UJ 8 J 0.0004 UNaphthalene 0.018 UJ 20 J 0.018 UPhenanthrene 0.0064 UJ 110 J 0.0064 UPyrene 0.0027 UJ 45 J 0.0027 UDibenzofuran 0.1 UJ 0.1 UJ 0.01 U2-Methylnaphthalene 0.62 J 1.4 J 0.01 U

RCRA Metals and Cyanide (mg/l)Arsenic 0.005 U 0.19 0.005 UBarium 0.008 0.002 0.081Cadmium 0.004 U 0.15 0.004 UChromium 0.007 U 0.007 U 0.007 ULead 0.042 U 0.434 0.042 UMercury 0.0002 U 0.06 0.0002 USelenium 0.075 U 0.075 U 0.075 USilver 0.01 U 0.01 U 0.010 UCyanide 0.01 U 0.01 U 0.010 UNotes1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.


Table B-8SI Groundwater Target Compound List (TCL) Analytical Results

Aurora MGP Site

Sample Location/ConcentrationCompound/Analyte SMW02 SMW06 DMW02 DMW04 DMW07

TCL Volatiles (mg/l)Acetone 0.100 U 0.100 U 0.100 U 0.100 U 0.200 UBenzene 0.0050 U 0.0050 U 0.0050 U 0.0050 U 4.8Bromodichloromethane 0.0050 U 0.0050 U 0.0050 U 0.0050 U 0.010 UBromoform 0.0050 U 0.0050 U 0.0050 U 0.0050 U 0.010 UBromomethane 0.010 U 0.010 U 0.010 U 0.010 U 0.020 U2-Butanone 0.100 U 0.100 U 0.100 U 0.100 U 0.200 UCarbon disulfide 0.100 U 0.100 U 0.100 U 0.100 U 0.200 UCarbon tetrachloride 0.0050 U 0.0050 U 0.0050 U 0.0050 U 0.010 UChlorobenzene 0.0050 U 0.0050 U 0.0050 U 0.0050 U 0.010 UChloroethane 0.010 U 0.010 U 0.010 U 0.010 U 0.020 UChloroform 0.0050 U 0.0050 U 0.0050 U 0.010 U 0.010 UChloromethane 0.010 U 0.010 U 0.010 U 0.0050 U 0.020 UChlorodibromomethane 0.0050 U 0.0050 U 0.0050 U 0.01 U 0.010 U1,1-Dichloroethane 0.0050 U 0.0050 U 0.0050 U 0.0050 U 0.010 U1,2-Dichloroethane 0.0050 U 0.0050 U 0.0050 U 0.0050 U 0.010 U1,1-Dichloroethene 0.0050 U 0.0050 U 0.0050 U 0.0050 U 0.010 Ucis-1,2-Dichloroethene 0.21 0.061 0.16 0.085 0.010 Utrans-1,2-Dichloroethene 0.0050 U 0.0050 U 0.0050 U 0.0050 U 0.010 U1,2-Dichloropropane 0.0050 U 0.0050 U 0.0050 U 0.0050 U 0.010 Ucis-1,3-Dichloropropene 0.0050 U 0.0050 U 0.0050 U 0.0050 U 0.010 Utrans-1,3-Dichloropropene 0.0050 U 0.0050 U 0.0050 U 0.0050 U 0.010 UEthylbenzene 0.0050 U 0.0050 U 0.0050 U 0.0050 U 1.32-Hexanone 0.050 U 0.050 U 0.050 U 0.050 U 0.100 UMethlene chloride 0.0050 U 0.0050 U 0.0050 U 0.0050 U 0.010 U4-Methyl-2-pentanone 0.050 U 0.050 U 0.050 U 0.050 U 0.100 UStyrene 0.0050 U 0.0050 U 0.0050 U 0.0050 U 0.721,1,2,2-Tetrachloroethane 0.0050 U 0.0050 U 0.0050 U 0.0050 U 0.010 UTetrachloroethene 0.0050 U 0.0068 0.0050 U 0.0068 0.010 UToluene 0.0050 U 0.0050 U 0.0050 U 0.0050 U 3.71,1,1-Trichloroethane 0.0050 U 0.0050 U 0.0050 U 0.0050 U 0.010 U1,1,2-Trichloroethane 0.0050 U 0.0050 U 0.0050 U 0.0050 U 0.010 UTrichloroethene 0.42 0.3 0.48 0.41 0.010 UVinly chloride 0.010 U 0.010 U 0.010 U 0.010 U 0.020 UXylenes (total) 0.0050 U 0.0050 U 0.0050 U 0.0050 U 2.1Note:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.


Table B-8 (Continued)SI Groundwater Target Compound List (TCL) Analytical Results

Aurora MGP Site

Sample Location/ConcentrationSMW02 SMW06 DMW02 DMW04 DMW07

Compound/AnalyteTCL Semivolatiles (mg/l)

4-Chloro-3-methylphenol 0.020 U 0.020 U 0.020 U 0.020 U 0.200 UJ2-Chlorophenol 0.010 U 0.010 U 0.010 U 0.010 U 0.100 UJ2,4-Dichlorophenol 0.010 U 0.010 U 0.010 U 0.010 U 0.100 UJ2,4-Dimethylphenol 0.010 U 0.010 U 0.010 U 0.010 U 0.100 UJ2,4-Dinitrophenol 0.050 U 0.050 U 0.050 U 0.050 U 0.500 UJ2-Methyl-4,6-dinitrophenol 0.050 U 0.050 U 0.050 U 0.050 U 0.500 UJ2-Methylphenol (O-cresol) 0.010 U 0.010 U 0.010 U 0.010 U 0.100 UJ4-Methylphenol (P-cresol) 0.010 U 0.010 U 0.010 U 0.010 U 0.100 UJ2-Nitrophenol 0.010 U 0.010 U 0.010 U 0.010 U 0.100 UJ4-Nitrophenol 0.050 U 0.050 U 0.050 U 0.050 U 0.500 UJPentachlorophenol 0.050 U 0.050 U 0.050 U 0.050 U 0.500 UJPhenol 0.010 U 0.010 U 0.010 U 0.010 U 0.100 UJ2,4,5-Trichlorophenol 0.010 U 0.010 U 0.010 U 0.010 U 0.100 UJ2,4,6-Trichlorophenol 0.010 U 0.010 U 0.010 U 0.010 U 0.100 UJBenzyl butyl phthalate 0.010 U 0.010 U 0.010 U 0.010 U 0.100 UJBis(2-chloroethoxy)methane 0.010 U 0.010 U 0.010 U 0.010 U 0.100 UJBis(2-chloroethyl)ether 0.010 U 0.010 U 0.010 U 0.010 U 0.100 UJBis(2-chloroisopropyl)ether 0.010 U 0.010 U 0.010 U 0.010 U 0.100 UJBis(2-ethylhexyl)phthalate 0.010 U 0.049 0.010 U 0.010 U 0.100 UJ4-Bromophenyl phenyl ether 0.010 U 0.010 U 0.010 U 0.010 U 0.100 UJCarbazole 0.010 U 0.010 U 0.010 U 0.010 U 0.100 UJ4-Chloroaniline 0.020 U 0.020 U 0.020 U 0.020 U 0.200 UJ2-Chloronaphthalene 0.010 U 0.010 U 0.010 U 0.010 U 0.100 UJ4-Chlorophenyl phenyl ether 0.010 U 0.010 U 0.010 U 0.010 U 0.100 UJDibenzofuran 0.010 U 0.010 U 0.010 U 0.010 U 0.100 UJDi-n-butyl phthalate 0.010 U 0.010 U 0.010 U 0.010 U 0.100 UJ1,2-Dichlorobenzene 0.010 U 0.010 U 0.010 U 0.010 U 0.100 UJ1,3-Dichlorobenzene 0.010 U 0.010 U 0.010 U 0.010 U 0.100 UJ1,4-Dichlorobenzene 0.010 U 0.010 U 0.010 U 0.010 U 0.100 UJ3,3'-Dichlorobenzidine 0.020 U 0.020 U 0.020 U 0.020 U 0.200 UJDiethyl phthalate 0.010 U 0.010 U 0.010 U 0.010 U 0.100 UJDimethyl phthalate 0.010 U 0.010 U 0.010 U 0.010 U 0.100 UJ2,4-Dinitrotoluene 0.010 U 0.010 U 0.010 U 0.010 U 0.100 UJ2,6-Dinitrotoluene 0.010 U 0.010 U 0.010 U 0.010 U 0.100 UJDi-n-octyl phthalate 0.010 U 0.010 U 0.010 U 0.010 U 0.100 UJHexachlorobenzene 0.010 U 0.010 U 0.010 U 0.010 U 0.100 UJNotes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.


Table B-8 (Continued)SI Groundwater Target Compound List (TCL) Analytical Results

Aurora MGP Site

Sample Location/Concentration

SMW02 SMW06 DMW02 DMW04 DMW07Compound/Analyte

TCL Semivolatiles (Continued) (mg/l)Hexachlorobutadiene 0.010 U 0.010 U 0.010 U 0.010 U 0.100 UJHexachlorocyclopentadiene 0.010 U 0.010 U 0.010 U 0.010 U 0.100 UJHexachloroethane 0.010 U 0.010 U 0.010 U 0.010 U 0.100 UJIsophorone 0.010 U 0.010 U 0.010 U 0.010 U 0.100 UJ2-Methylnaphthalene 0.010 U 0.010 U 0.010 U 0.010 U 0.620 J2-Nitroaniline 0.050 U 0.050 U 0.050 U 0.050 U 0.500 UJ3-Nitroaniline 0.050 U 0.050 U 0.050 U 0.050 U 0.500 UJ4-Nitroaniline 0.020 U 0.020 U 0.020 U 0.020 U 0.200 UJNitrobenzene 0.010 U 0.010 U 0.010 U 0.010 U 0.100 UJN-nitrosodimethylamine 0.010 U 0.010 U 0.010 U 0.010 U 0.100 UJN-nitrosodi-n-propylamine 0.010 U 0.010 U 0.010 U 0.010 U 0.100 UJN-nitrosodiphenylamine 0.010 U 0.010 U 0.010 U 0.010 U 0.100 UJ1,2,4-Trichlorobenzene 0.010 U 0.010 U 0.010 U 0.010 U 0.100 UJAcenaphthene 0.018 U 0.018 U 0.018 U 0.018 U 0.018 UJAcenaphthylene 0.023 U 0.023 U 0.023 U 0.023 U 0.023 UJAnthracene 0.0066 U 0.0066 U 0.0066 U 0.0066 U 0.0066 UJBenzo(a)anthracene 0.0001 U 0.0001 U 0.0001 U 0.0001 U 0.0001 UJBenzo(b)fluoranthene 0.0002 U 0.0002 U 0.0002 U 0.0002 U 0.0002 UJBenzo(k)fluoranthene 0.0002 U 0.0002 U 0.0002 U 0.0002 U 0.0002 UJBenzo(a)pyrene 0.0002 U 0.0002 U 0.0002 U 0.0002 U 0.0002 UJBenzo(g,h,i)perylene 0.0008 U 0.0008 U 0.0008 U 0.0008 U 0.0008 UJChrysene 0.0015 U 0.0015 U 0.0015 U 0.0015 U 0.0015 UJDibenzo(a,h)anthracene 0.0003 U 0.0003 U 0.0003 U 0.0003 U 0.0003 UJFluoranthene 0.0021 U 0.0021 U 0.0021 U 0.0021 U 0.0021 UJFluorene 0.0021 U 0.0021 U 0.0021 U 0.0021 U 0.0021 UJIndeno(1,2,3-cd)pyrene 0.0004 U 0.0004 U 0.0004 U 0.0004 U 0.0004 UJNaphthalene 0.018 U 0.018 U 0.018 U 0.018 U 0.018 UJPhenanthrene 0.0064 U 0.0064 U 0.0064 U 0.0064 U 0.0064 UJPyrene 0.0027 U 0.0027 U 0.0027 U 0.0027 U 0.0027 UJNotes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.


Table B-9 SI Groundwater Total Petroleum Hydrocarbons Analytical Results

Aurora MGP Site

Sample Location/ConcentrationParameter SMW01 SMW02 SMW03 SMW05 SMW06 SMW07 SMW09

TPH (mg/l)Gas 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 8.5Diesel 0.5 U 0.5 U 0.5 U 13 0.5 U 0.5 U 0.5 UOil 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 UNotes:1) U - Parameter not detected. The associated numerical value is the reporting limit.


Table B-10SI Groundwater Quality Analytical Results

Aurora MGP Site

Sample Location/ConcentrationParameter SMW01 SMW03 SMW06 SMW07 DMW01 DMW03 DMW07

Alkalinity, total (mg/l) 474 290 410 222 262 338 366Chloride (mg/l) 252 126 262 140 254 140 48Hardness (mg/l) 760 400 570 320 480 530 400N-Ammonia (mg/l) 0.50 U 0.50 U 0.50 U 0.50 U 0.50 U 0.50 U 0.68N-Kjeldahl (mg/l) 2.00 4.90 1.27 2.70 0.64 0.92 6.75Nitrate + Nitrite (mg/l) 0.82 8.80 8.37 3.11 2.07 0.64 0.50 UpH (units) 6.95 7.17 7.02 7.49 8.04 7.20 7.62Phosphate (mg/l) 2.1 1.2 4.0 0.37 0.31 3.1 0.18Total Dissolved Solids (mg/l) 1,000 606 995 523 786 607 438Sulfate (mg/l) 134 94 98 71 115 84 42Sulfide (mg/l) 0.10 U 0.10 U 0.10 U 0.10 U 0.10 U 0.10 U 0.10 UTotal Organic Carbon (mg/l) 3.5 3.4 2.4 10.6 14.8 8.8 50.6Note:U - Parameter not detected. The associated numerical value is the reporting limit.


APPENDIX C HURDS ISLAND NORTH INVESTIGATIONS ANALYTICAL RESULTS TABLES

AND INVESTIGATION ACTIVITIES MAPS SUPPLEMENTAL SITE INVESTIGATION

AURORA MGP SITE

Table C-1Hurds Island Soccer Field Surface Soil Analytical Results

Aurora MGP Site

Sample Location and Depth (feet below ground surface)/ConcentrationSS20-001 SS21-001 SS22-001 SS23-001 SS28-001 SS29-001



Phenols (mg/kg)2,4-Dimethylphenol 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U2-Methylphenol (O-cresol) 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U4-Methylphenol (P-cresol) 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U 0.33 UPhenol 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U

PAHs (mg/kg)Acenaphthene 0.66 UJ 0.66 UJ 0.66 UJ 0.66 UJ 0.66 UJ 0.66 UJAcenaphthylene 0.66 UJ 0.66 UJ 0.66 UJ 0.66 UJ 0.66 UJ 0.66 UJAnthracene 0.66 UJ 0.66 UJ 0.66 UJ 0.66 UJ 0.66 UJ 0.66 UJBenzo(a)anthracene 0.084 J 0.14 J 0.503 J 0.053 J 0.234 J 0.174 JBenzo(b)fluoranthene 0.091 J 0.107 J 0.392 J 0.121 J 0.209 J 0.171 JBenzo(k)fluoranthene 0.051 J 0.062 J 0.226 J 0.094 J 0.115 J 0.135 JBenzo(a)pyrene 0.093 J 0.124 J 0.486 J 0.053 J 0.256 J 0.156 JBenzo(g,h,i)perylene 0.057 J 0.082 J 0.215 J 0.06 J 0.155 J 0.117 JChrysene 0.11 J 0.13 J 0.639 J 0.103 J 0.283 J 0.285 JDibenzo(a,h)anthracene 0.006 UJ 0.021 J 0.073 J 0.006 UJ 0.045 J 0.22 JFluoranthene 0.66 UJ 0.66 UJ 1.039 J 0.66 UJ 0.66 UJ 0.66 UJFluorene 0.140 UJ 0.14 UJ 0.14 UJ 0.14 UJ 0.14 UJ 0.14 UJIndeno(1,2,3-cd)pyrene 0.079 J 0.074 J 0.227 J 0.043 J 0.165 J 0.165 JNaphthalene 0.025 UJ 0.048 J 0.07 J 0.025 UJ 0.055 J 0.039 JPhenanthrene 0.66 UJ 0.66 UJ 0.726 J 0.66 UJ 0.66 UJ 0.66 UJPyrene 0.18 UJ 0.26 J 1 J 0.18 UJ 0.411 J 0.366 JDibenzofuran 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U2-Methylnaphthalene 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U 0.33 UNotes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.


Table C-1 (Continued)Hurds Island Soccer Field Surface Soil Analytical Results

Aurora MGP Site

Sample Location and Depth (feet below ground surface)/ConcentrationSS34-001 SS35-001 SS36-001 SS37-001 SS59-001* SS59-002*




PAHs (mg/kg)Acenaphthene 0.66 UJ 0.66 UJ 0.66 UJ 0.66 U 0.66 U 0.66 UJAcenaphthylene 0.66 UJ 0.66 UJ 0.66 UJ 0.66 U 0.66 U 0.66 UJAnthracene 0.66 UJ 0.66 UJ 0.66 UJ 0.66 U 0.66 U 0.66 UJBenzo(a)anthracene 0.16 J 0.252 J 0.146 J 0.024 0.045 0.226 JBenzo(b)fluoranthene 0.16 J 0.182 J 0.127 J 0.038 0.043 0.165 JBenzo(k)fluoranthene 0.095 J 0.112 J 0.065 J 0.019 0.023 0.096 JBenzo(a)pyrene 0.135 J 0.257 J 0.124 J 0.0046 U 0.039 0.194 JBenzo(g,h,i)perylene 0.076 J 0.147 J 0.074 J 0.051 U 0.051 U 0.178 JChrysene 0.208 J 0.302 J 0.13 J 0.035 0.05 0.21 JDibenzo(a,h)anthracene 0.006 UJ 0.031 J 0.019 J 0.006 U 0.006 U 0.03 JFluoranthene 0.66 UJ 0.66 UJ 0.66 UJ 0.66 U 0.66 U 0.66 UJFluorene 0.14 UJ 0.14 UJ 0.14 UJ 0.14 U 0.14 U 0.14 UJIndeno(1,2,3-cd)pyrene 0.08 J 0.164 0.07 J 0.0086 U 0.026 0.108 JNaphthalene 0.033 J 0.08 J 0.044 J 0.025 U 0.025 U 0.068 JPhenanthrene 0.66 UJ 0.66 UJ 0.66 UJ 0.66 U 0.66 U 0.66 UJPyrene 0.266 J 0.53 J 0.27 J 0.18 U 0.18 U 0.41 JDibenzofuran 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U2-Methylnaphthalene 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U 0.33 UNotes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.3) * Composite surface soil sample.


Table C-1 (Continued)Hurds Island Soccer Field Surface Soil Analytical Results

Aurora MGP Site

Sample Location and Depth (feet below ground surface)/ConcentrationSS60-001* SS60-002* SS61-001* SS61-002* SS62-001* SS62-002*




PAHs (mg/kg)Acenaphthene 0.66 UJ 0.66 UJ 0.66 UJ 0.66 UJ 0.66 U 0.66 UJAcenaphthylene 0.66 UJ 0.66 UJ 0.66 UJ 0.66 UJ 0.66 U 0.66 UJAnthracene 0.66 UJ 0.66 UJ 0.66 UJ 0.66 UJ 0.66 U 0.66 UJBenzo(a)anthracene 0.03 J 0.069 J 0.163 J 0.34 J 0.057 0.0063 JBenzo(b)fluoranthene 0.089 J 0.089 J 0.209 J 0.368 J 0.046 0.062 JBenzo(k)fluoranthene 0.034 J 0.047 J 0.08 J 0.194 J 0.026 0.03 JBenzo(a)pyrene 0.024 J 0.062 J 0.168 J 0.322 J 0.044 0.048 JBenzo(g,h,i)perylene 0.051 UJ 0.056 J 0.111 J 0.172 J 0.051 U 0.062 JChrysene 0.051 J 0.109 J 0.223 J 0.465 J 0.06 0.06 JDibenzo(a,h)anthracene 0.006 UJ 0.006 UJ 0.025 J 0.047 J 0.007 0.008 JFluoranthene 0.66 UJ 0.66 UJ 0.66 UJ 0.739 J 0.66 U 0.66 UJFluorene 0.14 UJ 0.14 UJ 0.14 UJ 0.163 J 0.14 U 0.14 UJIndeno(1,2,3-cd)pyrene 0.0086 UJ 0.059 J 0.118 J 0.294 J 0.032 0.035 JNaphthalene 0.025 UJ 0.053 J 0.025 UJ 0.103 J 0.025 U 0.025 UJPhenanthrene 0.66 UJ 0.66 UJ 0.66 UJ 0.66 UJ 0.66 U 0.66 UJPyrene 0.18 UJ 0.18 UJ 0.332 J 0.639 J 0.18 U 0.18 UJDibenzofuran 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U2-Methylnaphthalene 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U 0.33 UNotes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.3) * Composite surface soil sample.


Table C-2Hurds Island SI Background Surface Soil Analytical Results*

Aurora MGP Site

Sample Location and Depth (feet below ground surface)/ConcentrationSP124-001 SP125-001 SP126-001 SP127-001 SP128-001

Compound/Analyte 0-3 0-0.5 0-3 0-0.5 0-3BTEX / Styrene (mg/kg)

Benzene 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UEthylbenzene 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UToluene 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UXylenes (total) 0.005 U 0.005 U 0.005 U 0.006 0.005 UStyrene 0.005 U 0.005 U 0.005 U 0.005 U 0.005 U

Phenols (mg/kg)2,4-Dimethylphenol 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U2-Methylphenol (O-cresol) 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U4-Methylphenol (P-cresol) 0.33 U 0.33 U 0.33 U 0.33 U 0.33 UPhenol 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U

PAHs (mg/kg)Acenaphthene 0.660 U 0.660 U 0.660 U 0.660 U 0.660 UJAcenaphthylene 0.660 U 0.660 U 0.660 U 0.660 U 0.660 UJAnthracene 0.660 U 0.660 U 0.660 U 0.660 U 0.660 UJBenzo(a)anthracene 0.090 0.050 0.022 0.062 0.26 JBenzo(b)fluoranthene 0.076 0.049 0.032 0.14 0.27 JBenzo(k)fluoranthene 0.038 0.023 0.010 0.022 U 0.17 JBenzo(a)pyrene 0.074 0.038 0.019 0.022 U 0.26 JBenzo(g,h,i)perylene 0.051 U 0.051 U 0.051 U 0.051 U 0.19 JChrysene 0.089 0.057 0.03 U 0.081 0.33 JDibenzo(a,h)anthracene 0.006 U 0.006 U 0.006 U 0.022 U 0.033 JFluoranthene 0.660 U 0.660 U 0.660 U 0.660 U 0.69 JFluorene 0.14 U 0.14 U 0.14 U 0.14 U 0.16 JIndeno(1,2,3-cd)pyrene 0.066 0.014 0.0086 U 0.022 U 0.17 JNaphthalene 0.025 U 0.025 U 0.025 U 0.025 U 0.090 JPhenanthrene 0.660 U 0.660 U 0.660 U 0.660 U 0.660 UJPyrene 0.18 U 0.18 U 0.18 U 0.18 U 0.61 JDibenzofuran 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U2-Methylnaphthalene 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U

RCRA Metals and Cyanide (mg/kg)Arsenic 3.1 J 11 J 6.9 J 8.7 J 5.2 JBarium 150 160 130 J 230 J 85 JCadmium 0.81 1.6 0.75 8.3 0.73Chromium 16 26 18 280 19Lead 20 J 35 J 39 J 110 J 97 JMercury 0.050 0.11 0.046 U 0.36 0.14Selenium 0.72 UR 0.69 J 0.39 J 0.48 J 1.5 Silver 2.3 U 2.6 U 2.3 U 4.6 J 2.4 JCyanide (total) 0.12 U 0.13 U 0.11 U 1.4 1.4Notes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.3) R - The result is unusable. The compound/analyte may or may not be present.4) * Background surface soil samples collected on two islands north of Hurds Island during the surface soil investigation.


Table C-2 (Continued)Hurds Island SI Background Surface Soil Analytical Results*

Aurora MGP Site

Sample Location and Depth (feet below ground surface)/ConcentrationSP129-001 SP130-001 SP131-001 SP132-001 SP133-001

Compound/Analyte 0-0.5 0-3 0-0.5 0-3 0-0.5BTEX / Styrene (mg/kg)

Benzene 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UEthylbenzene 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UToluene 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UXylenes (total) 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UStyrene 0.005 U 0.005 U 0.005 U 0.005 U 0.005 U

Phenols (mg/kg)2,4-Dimethylphenol 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U2-Methylphenol (O-cresol) 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U4-Methylphenol (P-cresol) 0.33 U 0.33 U 0.33 U 0.33 U 0.33 UPhenol 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U

PAHs (mg/kg)Acenaphthene 0.660 U 0.660 UJ 0.660 U 0.660 U 0.660 UJAcenaphthylene 0.660 U 0.660 UJ 0.660 U 0.660 U 0.660 UJAnthracene 0.660 U 0.660 UJ 0.660 U 0.660 U 0.660 UJBenzo(a)anthracene 0.061 0.13 J 0.091 0.099 0.24 JBenzo(b)fluoranthene 0.073 0.11 J 0.11 0.087 0.23 JBenzo(k)fluoranthene 0.039 0.089 J 0.067 0.039 0.11 JBenzo(a)pyrene 0.043 0.10 J 0.10 0.097 0.24 JBenzo(g,h,i)perylene 0.051 U 0.12 J 0.081 0.071 0.15 JChrysene 0.053 0.11 J 0.098 0.091 0.23 JDibenzo(a,h)anthracene 0.020 U 0.0077 UJ 0.15 0.012 0.017 UJFluoranthene 0.660 U 0.660 UJ 0.660 U 0.660 U 0.660 UJFluorene 0.14 U 0.14 UJ 0.14 U 0.14 U 0.14 UJIndeno(1,2,3-cd)pyrene 0.020 U 0.10 J 0.11 0.12 0.20 JNaphthalene 0.025 U 0.035 J 0.025 U 0.025 U 0.025 UJPhenanthrene 0.660 U 0.660 UJ 0.660 U 0.660 U 0.660 UJPyrene 0.18 U 0.22 J 0.19 0.20 0.49 JDibenzofuran 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U2-Methylnaphthalene 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U

RCRA Metals and Cyanide (mg/kg)Arsenic 8.8 J 13 J 7.9 J 7.8 J 7.9 JBarium 170 J 100 J 97 J 150 J 170 JCadmium 4.5 1.4 0.68 U 1.1 4.1Chromium 140 24 18 18 40Lead 90 J 92 J 15 J 40 J 100 JMercury 0.30 0.087 0.15 0.11 0.19Selenium 0.48 UJ 0.30 UJ 0.43 J 0.40 J 2.4 JSilver 2.4 U 2.4 U 2.7 U 2.6 U 2.9 UCyanide (total) 0.12 U 0.12 U 0.14 U 0.13 U 0.15 UNotes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) J - Estimated value.3) * Background surface soil samples collected on two islands north of Hurds Island during the surface soil investigation.


Table C-3 Hurds Island SI Surface Soil Analytical Results

Aurora MGP Site

Sample Location and Depth (feet below ground surface)/Concentration (SS01-001)¹ (SS02-001)¹ (SS03-001)¹ (SS06-001)² (SS07-001)² (SS08-001)²

Compound/Analyte 0-0.5 0-0.5 0-0.5 0-2 0-2 0-2BTEX / Styrene (mg/kg)



PAHs (mg/kg)Acenaphthene 1.20 U 1.20 U 1.20 U 0.660 UJ 0.660 UJ 0.660 UAcenaphthylene 1.54 U 1.54 U 1.54 U 0.660 UJ 0.660 UJ 0.660 UAnthracene 0.440 U 0.440 U 0.440 U 0.660 UJ 0.660 UJ 0.660 UBenzo(a)anthracene 0.264 0.070 0.190 0.31 J 0.13 J 0.094Benzo(b)fluoranthene 0.198 0.051 0.110 0.24 J 0.073 J 0.059Benzo(k)fluoranthene 0.132 0.030 0.068 0.090 J 0.052 J 0.043Benzo(a)pyrene 0.330 0.095 0.220 0.19 J 0.09 J 0.073Benzo(g,h,i)perylene 0.330 0.098 0.200 0.17 J 0.06 J 0.051 UChrysene 0.317 0.100 U 0.160 0.27 J 0.12 J 0.081Dibenzo(a,h)anthracene 0.264 0.034 0.033 0.006 UJ 0.006 UJ 0.01Fluoranthene 0.818 0.210 0.570 0.660 UJ 0.660 UJ 0.660 UFluorene 0.140 U 0.140 U 0.140 U 0.14 UJ 0.14 UJ 0.14 UIndeno(1,2,3-cd)pyrene 0.237 0.067 0.150 0.13 J 0.0086 UJ 0.0630Naphthalene 0.858 U 1.20 U 1.20 U 0.090 J 0.050 J 0.025 UPhenanthrene 0.369 0.428 U 0.428 U 0.660 UJ 0.660 UJ 0.660 UPyrene 0.725 0.180 U 0.380 0.50 J 0.19 J 0.18 UDibenzofuran 0.66 U 0.66 U 0.66 U 0.33 U 0.33 U 0.33 U2-Methylnaphthalene 0.66 U 0.66 U 0.66 U 0.33 U 0.33 U 0.33 U

RCRA Metals and Cyanide (mg/kg)Arsenic 5.7 4.4 8.0 20 J 15 J 1.3 JBarium 86 78 107 100 J 140 J 120 JCadmium 3.1 1.6 2.2 0.98 1.4 1.4Chromium 25 12 20 14 J 23 14Lead 110 59 120 74 70 73Mercury 0.15 0.09 0.05 0.2 0.14 0.15Selenium 0.48 U 0.48 U 0.48 U 0.48 U 0.5 0.48 USilver 1.0 U 1.0 U 1.0 U 2.4 U 2.4 U 2.3 UCyanide (total) 0.10 UJ 0.10 UJ 0.10 UJ 0.12 U 1.0 0.12 UNotes:1) Surface soil sample collected during the 1995-1996 site investigation.2) Surface soil sample collected during the Hurds Island 1997 surface soil investigation.3) U - Compound/analyte not detected. The associated numerical value is the reporting limit.4) J - Estimated value.


Table C-3 (Continued) Hurds Island SI Surface Soil Analytical Results

Aurora MGP Site

Sample Location and Depth (feet below ground surface)/Concentration (SS09-001)¹ (SS11-001)¹ (SS12-001)¹ (SS13-001)¹ (SS14-001)¹

Compound/Analyte 0-2 0-2 0-2 0-2 0-2BTEX / Styrene (mg/kg)


Phenols (mg/kg)2,4-Dimethylphenol 0.33 U 9 UJ 0.33 U 0.33 U 0.33 U2-Methylphenol (O-cresol) 0.33 U 9 UJ 0.33 U 0.33 U 0.33 U4-Methylphenol (P-cresol) 0.33 U 9 UJ 0.33 U 0.33 U 0.33 UPhenol 0.33 U 9 UJ 0.33 U 0.33 U 0.33 U

PAHs (mg/kg)Acenaphthene 0.660 U 0.660 UJ 0.660 UJ 0.660 UJ 0.660 UJAcenaphthylene 0.660 U 0.660 UJ 0.660 UJ 0.660 UJ 0.660 UJAnthracene 0.660 U 3.4 J 0.660 UJ 0.660 UJ 0.660 UJBenzo(a)anthracene 0.065 12 J 0.45 J 0.16 J 0.09 JBenzo(b)fluoranthene 0.043 7.9 J 0.34 J 0.12 J 0.11 JBenzo(k)fluoranthene 0.013 5.2 J 0.21 J 0.058 J 0.031 JBenzo(a)pyrene 0.049 11 J 0.40 J 0.12 J 0.067 JBenzo(g,h,i)perylene 0.051 U 4.5 J 0.21 J 0.082 J 0.051 UJChrysene 0.06 9.4 J 0.40 J 0.14 J 0.09 JDibenzo(a,h)anthracene 0.01 1.4 J 0.05 J 0.018 J 0.008 JFluoranthene 0.660 U 27 J 0.85 J 0.660 UJ 0.660 UJFluorene 0.14 U 0.14 UJ 0.18 J 0.14 UJ 0.14 UJIndeno(1,2,3-cd)pyrene 0.049 6.2 J 0.26 J 0.089 J 0.0660 JNaphthalene 0.025 U 1.5 J 0.034 J 0.062 J 0.054 JPhenanthrene 0.660 U 3.7 J 0.660 UJ 0.660 UJ 0.660 UJPyrene 0.18 U 18 J 0.76 J 0.21 J 0.18 UJDibenzofuran 0.33 U 16 UJ 0.33 U 0.33 U 0.33 U2-Methylnaphthalene 0.33 U 16 UJ 0.33 U 0.33 U 0.33 U

RCRA Metals and Cyanide (mg/kg)Arsenic 2.8 J 4.7 J 7.4 J 4.4 J 2.6 JBarium 120 J 140 J 79 170 140 JCadmium 0.67 U 0.99 0.58 U 0.98 1.6Chromium 8.5 20 18 14 J 32Lead 29 250 63 420 88Mercury 0.053 U 0.087 0.046 U 0.097 0.096Selenium 0.48 U 0.48 UJ 0.48 U 0.48 U 0.48 USilver 2.7 U 2.4 U 2.3 U 2.6 U 2.6 UCyanide (total) 0.13 U 1.9 0.12 U 0.13 U 0.13 UNotes:1) Surface soil sample collected during the Hurds Island 1997 surface soil investigation.2) U - Compound/analyte not detected. The associated numerical value is the reporting limit.3) J - Estimated value.



Aurora MGP Site

Sample Location and Depth (feet below ground surface)/Concentration (SS15-001)¹ (SS16-001)¹ (SS17-001)¹ (SS18-001)¹ (SS19-001)¹ (SS24-001)¹



Phenols (mg/kg)2,4-Dimethylphenol 0.33 U 0.33 U 0.33 UJ 0.33 U 0.33 U 0.33 U2-Methylphenol (O-cresol) 0.33 U 0.33 U 0.33 UJ 0.33 U 0.33 U 0.33 U4-Methylphenol (P-cresol) 0.33 U 0.33 U 0.33 UJ 0.33 U 0.33 U 0.33 UPhenol 0.33 U 0.33 U 0.33 UJ 0.33 U 0.33 U 0.33 U

PAHs (mg/kg)Acenaphthene 0.660 UJ 0.660 UJ 0.660 U 0.660 U 0.660 UJ 0.660 UJAcenaphthylene 0.660 UJ 0.660 UJ 0.660 U 0.660 U 0.660 UJ 0.660 UJAnthracene 0.660 UJ 0.660 UJ 0.660 U 0.660 U 0.660 UJ 0.660 UJBenzo(a)anthracene 0.41 J 0.12 J 0.045 0.062 0.16 J 0.059 JBenzo(b)fluoranthene 0.25 J 0.087 J 0.031 0.049 0.10 J 0.038 JBenzo(k)fluoranthene 0.170 J 0.051 J 0.009 0.027 0.042 J 0.019 JBenzo(a)pyrene 0.32 J 0.096 J 0.033 0.056 0.089 J 0.041 JBenzo(g,h,i)perylene 0.21 J 0.067 J 0.051 U 0.051 U 0.085 J 0.051 UJChrysene 0.38 J 0.12 J 0.04 0.06 0.15 J 0.056 JDibenzo(a,h)anthracene 0.049 J 0.013 J 0.006 U 0.008 0.018 J 0.007 JFluoranthene 0.660 UJ 0.660 UJ 0.660 U 0.66 U 0.660 UJ 0.660 UJFluorene 0.14 UJ 0.14 UJ 0.14 U 0.14 U 0.14 UJ 0.14 UJIndeno(1,2,3-cd)pyrene 0.230 J 0.094 J 0.023 0.053 0.056 J 0.0290 JNaphthalene 0.025 UJ 0.140 J 0.025 U 0.025 U 0.300 J 0.025 UJPhenanthrene 0.660 UJ 0.660 UJ 0.660 U 0.660 U 0.660 UJ 0.660 UJPyrene 0.76 J 0.22 J 0.18 U 0.18 U 0.18 UJ 0.18 UJDibenzofuran 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U2-Methylnaphthalene 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U

RCRA Metals and Cyanide (mg/kg)Arsenic 2.1 J 14 J 22 J 18 J 6 J 5.8 JBarium 120 J 120 140 130 140 110Cadmium 0.64 U 1.2 0.90 1.0 0.95 0.61Chromium 8.9 23 52 31 13 11Lead 29 88 52 79 340 34Mercury 0.12 0.095 0.056 0.081 0.044 0.07Selenium 0.48 U 0.48 U 0.48 U 0.48 0.48 U 0.48 USilver 2.6 U 2.4 U 2.3 U 2.4 U 2.5 U 2.4 UCyanide (total) 0.13 U 0.86 0.84 0.25 0.73 0.12 UNotes:1) Surface soil sample collected during the Hurds Island 1997 surface soil investigation.2) U - Compound/analyte not detected. The associated numerical value is the reporting limit.3) J - Estimated value.



Aurora MGP Site





PAHs (mg/kg)Acenaphthene 0.660 UJ 0.660 UJ 0.660 UJ 0.660 U 0.660 UJ 0.660 UJAcenaphthylene 0.660 UJ 0.660 UJ 0.660 UJ 0.660 U 0.660 UJ 0.660 UJAnthracene 0.660 UJ 0.660 UJ 0.660 UJ 0.660 U 0.660 UJ 0.87 JBenzo(a)anthracene 0.27 J 0.26 J 0.19 J 0.039 0.22 J 0.77 JBenzo(b)fluoranthene 0.18 J 0.23 J 0.18 J 0.035 0.21 J 0.63 JBenzo(k)fluoranthene 0.11 J 0.15 J 0.096 J 0.022 0.180 J 0.21 JBenzo(a)pyrene 0.22 J 0.37 J 0.19 J 0.049 0.28 J 0.47 JBenzo(g,h,i)perylene 0.13 J 0.34 J 0.13 J 0.051 U 0.24 J 0.19 JChrysene 0.24 J 0.20 J 0.24 J 0.06 0.19 J 0.77 JDibenzo(a,h)anthracene 0.029 J 0.006 UJ 0.034 J 0.006 U 0.038 J 0.051 JFluoranthene 0.660 UJ 0.660 UJ 0.660 UJ 0.66 U 0.660 UJ 2.4 JFluorene 0.14 UJ 0.14 UJ 0.14 UJ 0.14 U 0.14 UJ 0.14 UJIndeno(1,2,3-cd)pyrene 0.200 J 0.360 J 0.12 J 0.037 0.27 J 0.3 JNaphthalene 0.049 J 0.170 J 0.072 J 0.036 0.16 J 0.025 UJPhenanthrene 0.660 UJ 0.660 UJ 0.660 UJ 0.660 U 0.660 UJ 1.7 JPyrene 0.47 J 0.47 J 0.18 J 0.18 U 0.39 J 1.0 JDibenzofuran 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U2-Methylnaphthalene 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U

RCRA Metals and Cyanide (mg/kg)Arsenic 10 J 31 J 5.9 J 54 J 9.1 J 12 JBarium 120 250 130 260 190 J 220 JCadmium 0.94 5.4 1.5 7.8 1.0 2.90Chromium 21 60 16 64 25 40Lead 90 96 78 94 120 120Mercury 0.095 0.11 0.11 0.19 0.096 1.1Selenium 0.48 U 0.48 U 0.67 0.48 U 0.48 U 0.48 USilver 2.4 U 2.4 U 2.4 U 2.3 U 2.3 U 2.4 UCyanide (total) 0.12 U 0.12 U 0.12 U 0.12 U 0.12 U 0.12 UNotes:1) Surface soil sample collected during the Hurds Island 1997 surface soil investigation.2) U - Compound/analyte not detected. The associated numerical value is the reporting limit.3) J - Estimated value.



Aurora MGP Site


Compound/Analyte 0-2 0-0.5 0-3 0-0.5 0-0.5 0-0.5BTEX / Styrene (mg/kg)



PAHs (mg/kg)Acenaphthene 0.660 UJ 0.660 UJ 0.660 U 0.660 U 0.660 UJ 0.660 UJAcenaphthylene 0.660 UJ 0.660 UJ 0.660 U 0.660 U 0.660 UJ 0.660 UJAnthracene 0.660 UJ 0.660 UJ 0.660 U 0.660 U 0.660 UJ 0.660 UJBenzo(a)anthracene 0.13 J 0.13 J 0.059 0.078 0.094 J 0.64 JBenzo(b)fluoranthene 0.14 J 0.10 J 0.035 0.064 0.051 J 0.38 JBenzo(k)fluoranthene 0.083 J 0.097 J 0.011 0.030 0.033 J 0.30 JBenzo(a)pyrene 0.11 J 0.098 J 0.05 0.053 0.058 J 0.43 JBenzo(g,h,i)perylene 0.065 J 0.053 J 0.051 U 0.051 U 0.051 UJ 0.2 JChrysene 0.12 J 0.12 J 0.05 0.07 0.09 J 0.58 JDibenzo(a,h)anthracene 0.006 UJ 0.013 J 0.006 U 0.006 U 0.006 UJ 0.059 JFluoranthene 0.660 UJ 0.660 UJ 0.660 U 0.66 U 0.660 UJ 1.4 JFluorene 0.14 UJ 0.14 UJ 0.14 U 0.14 U 0.14 UJ 0.38 JIndeno(1,2,3-cd)pyrene 0.090 J 0.084 J 0.04 0.055 0.052 J 0.25 JNaphthalene 0.064 J 0.025 UJ 0.025 U 0.025 U 0.025 UJ 0.260 JPhenanthrene 0.660 UJ 0.660 UJ 0.660 U 0.660 U 0.660 UJ 1.7 JPyrene 0.23 J 0.22 J 0.18 U 0.18 U 0.18 UJ 1.4 JDibenzofuran 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U2-Methylnaphthalene 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U

RCRA Metals and Cyanide (mg/kg)Arsenic 8.2 J 6.6 J 3.7 J 7.5 J 3.5 J 4.2 JBarium 150 J 150 J 130 J 150 J 110 J 120 JCadmium 1.1 1.3 0.67 0.88 0.61 0.88Chromium 21 23 9.7 23 12 19Lead 120 52 35 120 83 110Mercury 0.083 0.067 0.11 0.12 0.11 0.17Selenium 0.48 U 0.48 U 0.48 U 0.48 U 0.48 U 0.48 USilver 2.2 U 2.5 U 2.7 U 2.4 U 2.4 U 2.3 UCyanide (total) 0.11 U 0.12 U 0.13 U 0.12 U 0.12 U 0.11 UNotes:1) Surface soil sample collected during the Hurds Island 1997 surface soil investigation.2) U - Compound/analyte not detected. The associated numerical value is the reporting limit.3) J - Estimated value.



Aurora MGP Site


Compound/Analyte 0-0.5 0-3 0-3 0-2 0-3 0-0.5BTEX / Styrene (mg/kg)



PAHs (mg/kg)Acenaphthene 0.660 UJ 0.660 UJ 0.660 UJ 0.660 UJ 0.660 UJ 0.660 UJAcenaphthylene 0.660 UJ 0.660 UJ 0.660 UJ 0.660 UJ 0.660 UJ 0.660 UJAnthracene 0.660 UJ 0.660 UJ 0.660 UJ 0.660 UJ 0.660 UJ 0.660 UJBenzo(a)anthracene 0.24 J 0.14 J 0.63 J 0.24 J 0.14 J 0.12 JBenzo(b)fluoranthene 0.17 J 0.11 J 0.41 J 0.18 J 0.180 J 0.11 JBenzo(k)fluoranthene 0.100 J 0.054 J 0.41 J 0.11 J 0.051 J 0.036 JBenzo(a)pyrene 0.21 J 0.099 J 0.45 J 0.21 J 0.1 J 0.066 JBenzo(g,h,i)perylene 0.13 J 0.051 UJ 0.22 J 0.13 J 0.092 J 0.051 UJChrysene 0.21 J 0.12 J 0.54 J 0.22 J 0.13 J 0.12 JDibenzo(a,h)anthracene 0.023 J 0.013 J 0.057 J 0.006 UJ 0.018 J 0.006 UJFluoranthene 0.660 UJ 0.660 UJ 1.4 J 0.660 UJ 0.660 UJ 0.660 UJFluorene 0.14 UJ 0.14 UJ 0.28 J 0.14 UJ 0.14 UJ 0.14 UJIndeno(1,2,3-cd)pyrene 0.160 J 0.065 J 0.12 J 0.16 J 0.063 J 0.041 JNaphthalene 0.025 J 0.069 J 0.13 J 0.075 J 0.170 J 0.240 JPhenanthrene 0.660 UJ 0.660 UJ 1.3 J 0.660 UJ 0.660 UJ 0.660 UJPyrene 0.45 J 0.21 J 1.4 J 0.18 UJ 0.21 J 0.18 UJDibenzofuran 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U2-Methylnaphthalene 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U

RCRA Metals and Cyanide (mg/kg)Arsenic 5.4 J 4.5 J 6.0 J 2.5 J 4.7 J 16 JBarium 100 J 120 J 75 J 120 J 120 J 240 JCadmium 0.85 0.79 0.97 1.4 1.5 1.9Chromium 17 16 14 23 25 47Lead 88 140 61 100 56 78Mercury 0.16 0.16 0.044 U 0.11 0.092 0.043 USelenium 0.48 U 0.48 U 0.48 U 0.48 U 0.48 U 0.48 USilver 2.6 U 2.4 U 2.2 U 2.3 U 2.2 U 2.4Cyanide (total) 0.13 U 0.12 U 0.11 U 0.11 U 0.12 U 0.11 UNotes:1) Surface soil sample collected during the Hurds Island 1997 surface soil investigation.2) U - Compound/analyte not detected. The associated numerical value is the reporting limit.3) J - Estimated value.



Aurora MGP Site

Sample Location and Depth (feet below ground surface)/Concentration (SB20-001)¹ (SB21-001)¹ (SB28a-001)¹ (SB29a-001)¹ (SB30a-001)¹

Compound/Analyte 0-2 0-2 0-2 0-2 0-2BTEX / Styrene (mg/kg)


Phenols (mg/kg)2,4-Dimethylphenol 6.6 UJ 6.6 UJ 0.66 U 3.3 UJ 0.66 U2-Methylphenol (O-cresol) 6.6 UJ 6.6 UJ 0.66 U 3.3 UJ 0.66 U4-Methylphenol (P-cresol) 6.6 UJ 6.6 UJ 0.66 U 3.3 UJ 0.66 UPhenol 6.6 UJ 6.6 UJ 0.66 U 3.3 UJ 0.66 U

PAHs (mg/kg)Acenaphthene 1.0 UJ 1.20 UJ 1.20 U 1.2 U 1.20 UAcenaphthylene 1.54 UJ 1.54 UJ 1.54 U 1.54 U 1.54 UAnthracene 0.440 UJ 1.18 J 0.440 U 0.440 U 0.440 UBenzo(a)anthracene 0.193 J 1.07 J 0.050 0.047 0.035Benzo(b)fluoranthene 0.932 J 3.79 J 0.041 0.047 0.034Benzo(k)fluoranthene 0.113 J 3.21 J 0.022 0.033 0.025Benzo(a)pyrene 0.803 J 9.15 J 0.048 0.059 0.091Benzo(g,h,i)perylene 0.318 J 2.40 J 0.052 0.053 0.051 UChrysene 0.180 J 1.04 J 0.100 U 0.188 0.100 UDibenzo(a,h)anthracene 0.036 J 0.520 J 0.020 U 0.020 U 0.020 UFluoranthene 0.529 J 2.69 J 0.140 U 0.140 U 0.140 UFluorene 0.140 UJ 0.140 UJ 0.140 U 0.140 U 0.228Indeno(1,2,3-cd)pyrene 0.270 J 6.29 J 0.073 0.064 0.028 UNaphthalene 1.20 UJ 2.36 J 1.20 U 1.20 U 1.20 UPhenanthrene 0.579 J 1.68 J 0.428 U 0.428 U 0.428 UPyrene 0.604 J 3.48 J 0.180 U 0.180 U 1.06Dibenzofuran 6.6 UJ 6.6 UJ 0.66 U 3.3 UJ 0.66 U2-Methylnaphthalene 6.6 UJ 6.6 UJ 0.66 U 3.3 UJ 0.66 U

RCRA Metals and Cyanide (mg/kg)Arsenic 13 28 5.7 6.6 17Barium 260 250 125 120 120Cadmium 2.2 2.0 0.40 U 0.87 1.4Chromium 43 27 7.4 12 12Lead 77 74 41 140 120Mercury 0.04 0.19 0.02 U 0.15 0.04Selenium 0.53 0.48 0.48 0.55 0.48 USilver 1.0 U 1.0 U 1.0 U 1.0 U 1.0 UCyanide (total) 0.10 U 0.81 0.10 U 0.16 0.10 UNotes:1) Surface soil sample collected during the 1995-1996 site investigation.2) U - Compound/analyte not detected. The associated numerical value is the reporting limit.3) J - Estimated value.


Table C-4Hurds Island SI Surface Soil Physical Parameter Results

Aurora MGP Site

Sample Location and Depth (feet below ground surface)/Results SS09-001 SS13-001 SS17-001 SS24-001 SS30-001 SS39-001 SS44-001 SS47-001

Parameter 0-2 0-2 0-2 0-2 0-2 0-3 0-3 0-3Organic carbon content (%) 7.3 7.3 3.5 6.6 2.7 6.7 6.9 6Moisture content (%) 24.8 21.7 14.1 17.1 13.4 25.4 18.2 15.7pH 8.24 8.11 8.18 8.23 8.27 8.28 8.13 8.37Soil particle density (g/cm³) 2.62 2.61 2.67 2.65 2.73 2.63 2.63 2.56


Table C-5Hurds Island SI Subsurface Soil Analytical Results

Aurora MGP Site

Sample Location and Depth (feet below ground surface)/Concentration (SB20-002)¹ (SB21-002)¹ (SB21-003)¹ (SB28a-002)¹ (SB29a-002)¹ (SB29a-003)¹


Benzene 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U 0.25 UEthylbenzene 0.25 U 34 0.25 U 0.25 U 0.25 U 0.25 UToluene 0.25 U 1.1 0.25 U 0.25 U 0.25 U 0.25 UXylenes (total) 0.25 U 30 0.25 U 0.25 U 0.25 U 0.25 UStyrene 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U

Phenols (mg/kg)2,4-Dimethylphenol 0.66 U 6.6 UJ 0.66 U 0.66 U 0.66 U 0.66 U2-Methylphenol (O-cresol) 0.66 U 6.6 UJ 0.66 U 0.66 U 0.66 U 0.66 U4-Methylphenol (P-cresol) 0.66 U 6.6 UJ 0.66 U 0.66 U 0.66 U 0.66 UPhenol 0.66 U 6.6 UJ 0.66 U 0.66 U 0.66 U 0.66 U

PAH (mg/kg)Acenaphthene 1.20 U 158 J 1.20 U 1.20 U 1.20 U 2.00Acenaphthylene 1.54 U 1.54 UJ 1.54 U 1.54 U 1.54 U 1.54 UAnthracene 0.440 U 98.8 J 0.440 U 0.440 U 0.440 U 1.60Benzo(a)anthracene 0.0087 U 32.0 J 0.091 0.181 U 0.181 U 1.30Benzo(b)fluoranthene 0.012 U 12.5 J 0.034 0.100 U 0.100 U 0.42Benzo(k)fluoranthene 0.011 U 8.28 J 0.023 0.148 U 0.148 U 0.59Benzo(a)pyrene 0.015 U 55.7 J 0.082 0.112 U 0.112 U 0.75Benzo(g,h,i)perylene 0.051 U 19.3 J 0.051 U 0.100 U 0.100 U 0.100 UChrysene 0.100 U 23.5 J 0.100 U 0.100 U 0.100 U 0.96Dibenzo(a,h)anthracene 0.020 U 6.05 J 0.020 U 0.060 U 0.060 U 0.09Fluoranthene 0.140 U 124 J 0.140 U 0.140 U 0.140 U 1.60Fluorene 0.140 U 77.8 J 0.279 0.140 U 0.14 U 1.20Indeno(1,2,3-cd)pyrene 0.028 U 20.9 J 0.028 U 0.096 U 0.096 U 0.23Naphthalene 1.20 U 628 J 1.20 U 1.20 U 1.20 U 1.90Phenanthrene 0.428 U 260 J 0.453 0.428 U 0.428 U 3.30Pyrene 0.180 U 95.3 J 0.180 U 0.223 U 0.223 U 2.20Dibenzofuran 0.66 U 31 J 0.66 U 0.66 U 0.66 U 0.66 U2-Methylnaphthalene 0.66 U 390 J 0.66 U 0.66 U 0.66 U 0.66 U

RCRA Metals and Cyanide (mg/kg)Arsenic 3.5 37 2.2 1.5 2.9 1.4Barium 32 300 7.6 33 130 4.7Cadmium 0.40 U 2.5 0.40 U 0.40 U 0.40 U 0.40 UChromium 3.7 51 2.3 2.7 4.1 0.70 ULead 7.9 93 13 4.2 U 10 4.2 UMercury 0.09 0.02 U 0.02 U 0.02 U 0.02 U 0.02 USelenium 0.61 0.83 0.74 0.56 0.48 U 0.48 USilver 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 UCyanide (total) 0.10 U 0.29 0.10 U 0.10 U 0.10 U 0.10 UNotes:1) Subsurface soil sample collected during the 1995-1996 site investigation.2) J - Estimated value.3) U - Compound/analyte not detected. The associated numerical value is the reporting limit.


Table C-5 (Continued)Hurds Island SI Subsurface Soil Analytical Results

Aurora MGP Site

Sample Location and Depth (feet below ground surface)/Concentration (SB30a-002)¹ (SP16-001)¹ (SP17-001)¹ (SP21-001)¹ (SP21-002)¹ (SP23-001)¹


Benzene 0.25 U 0.25 U 0.25 U 0.25 U NA 0.25 UEthylbenzene 0.25 U 0.25 U 0.25 U 0.25 U NA 0.25 UToluene 0.25 U 0.25 U 0.25 U 0.25 U NA 0.25 UXylenes (total) 0.25 U 0.25 U 0.25 U 0.25 U NA 0.25 UStyrene 0.25 U 0.25 U 0.25 U 0.25 U NA 0.25 U

Phenols (mg/kg)2,4-Dimethylphenol 0.66 U 0.66 U NA NA 0.66 U 3.3 UJ2-Methylphenol (O-cresol) 0.66 U 0.66 U NA NA 0.66 U 3.3 UJ4-Methylphenol (P-cresol) 0.66 U 0.66 U NA NA 0.66 U 3.3 UJPhenol 0.66 U 0.66 U NA NA 0.66 U 3.3 UJ

PAH (mg/kg)Acenaphthene 1.20 U 1.20 U NA NA 1.20 U 1.20 UJAcenaphthylene 1.54 U 1.54 U NA NA 1.54 U 1.54 UJAnthracene 0.440 U 0.440 U NA NA 0.440 U 0.440 UJBenzo(a)anthracene 0.0087 U 0.0087 U NA NA 0.0087 U 0.0087 UJBenzo(b)fluoranthene 0.012 U 0.012 U NA NA 0.012 U 0.012 UJBenzo(k)fluoranthene 0.011 U 0.011 U NA NA 0.011 U 0.011 UJBenzo(a)pyrene 0.015 U 0.015 U NA NA 0.015 U 0.015 UJBenzo(g,h,i)perylene 0.051 U 0.051 U NA NA 0.051 U 0.051 UJChrysene 0.100 U 0.100 U NA NA 0.100 U 0.100 UJDibenzo(a,h)anthracene 0.020 U 0.020 U NA NA 0.020 U 0.020 UJFluoranthene 0.140 U 0.140 U NA NA 0.140 U 0.882 JFluorene 0.140 U 0.140 U NA NA 0.140 U 0.380 JIndeno(1,2,3-cd)pyrene 0.028 U 0.028 U NA NA 0.028 U 0.028 UJNaphthalene 1.20 U 1.20 U NA NA 1.3 2.17 JPhenanthrene 0.428 U 0.428 U NA NA 0.428 U 0.529 JPyrene 0.180 U 0.180 U NA NA 0.180 U 1.06 JDibenzofuran 0.66 U 0.66 U NA NA 0.66 U 3.3 UJ2-Methylnaphthalene 0.66 U 0.66 U NA NA 0.66 U 3.3 UJ

RCRA Metals and Cyanide (mg/kg)Arsenic 1.9 1.9 NA NA NA 1.2Barium 7.4 38 NA NA NA 122Cadmium 0.40 U 0.40 U NA NA NA 0.40 UChromium 3.0 0.7 U NA NA NA 5.5Lead 4.2 U 4.2 U NA NA NA 9.9Mercury 0.02 U 0.02 NA NA NA 0.04Selenium 0.48 U 7.5 U NA NA NA 0.73 Silver 1.0 U 1.0 U NA NA NA 1.3Cyanide (total) 0.10 U 0.10 U NA NA NA 1.2Notes:1) Subsurface soil sample collected during the 1995-1996 site investigation.2) J - Estimated value.3) U - Compound/analyte not detected. The associated numerical value is the reporting limit.4) NA - Not analyzed.



Aurora MGP Site

Sample Location and Depth (feet below ground surface)/Concentration (SP27-001)¹ (SP46-001)¹ (SP48-001)¹ (SP51-001)¹ (SP113-001)² (SP119-001)²


Benzene 0.25 U 0.25 U 0.25 U 0.25 U 0.005 U 0.005 UJEthylbenzene 0.25 U 0.25 U 1.4 1.7 0.005 U 0.005 UJToluene 0.25 U 0.25 U 0.25 U 0.25 U 0.005 U 0.005 UJXylenes (total) 0.25 U 0.25 U 1.3 1.8 0.005 U 0.005 UJStyrene 0.25 U 0.25 U 0.25 U 0.25 U 0.005 U 0.005 UJ

Phenols (mg/kg)2,4-Dimethylphenol 0.66 U NA 3.3 UJ 3.3 UJ 0.33 U 0.33 U2-Methylphenol (O-cresol) 0.66 U NA 3.3 UJ 3.3 UJ 0.33 U 0.33 U4-Methylphenol (P-cresol) 0.66 U NA 3.3 UJ 3.3 UJ 0.33 U 0.33 UPhenol 0.66 U NA 3.3 UJ 3.3 UJ 0.33 U 0.33 U

PAH (mg/kg)Acenaphthene 1.20 U NA 1.20 U 52.9 J 0.660 U 0.660 UAcenaphthylene 1.54 U NA 1.54 U 4.0 UJ 0.660 U 0.660 UAnthracene 0.440 U NA 0.440 U 11.6 J 0.660 U 0.660 UBenzo(a)anthracene 0.0087 U NA 0.177 15.6 J 0.015 0.057Benzo(b)fluoranthene 0.012 U NA 0.024 2.17 J 0.0036 U 0.059Benzo(k)fluoranthene 0.011 U NA 0.011 U 2.04 J 0.0034 U 0.056Benzo(a)pyrene 0.015 U NA 0.072 7.22 J 0.0046 U 0.082Benzo(g,h,i)perylene 0.051 U NA 0.069 4.45 J 0.051 U 0.074Chrysene 0.100 U NA 0.100 U 6.62 J 0.03 U 0.046Dibenzo(a,h)anthracene 0.020 U NA 0.020 U 3.49 J 0.006 U 0.007 UFluoranthene 0.140 U NA 0.851 21.7 J 0.660 U 0.660 UFluorene 0.140 U NA 0.236 25.3 J 0.14 U 0.14 UIndeno(1,2,3-cd)pyrene 0.028 U NA 0.034 3.13 J 0.0086 U 0.065Naphthalene 1.20 U NA 1.65 79.4 J 0.025 U 0.025 UPhenanthrene 0.428 U NA 0.428 U 50.5 J 0.660 U 0.660 UPyrene 0.180 U NA 0.201 18.1 J 0.18 U 0.18 UDibenzofuran 0.66 U NA 3.3 UJ 6.6 J 0.33 U 0.33 U2-Methylnaphthalene 0.66 U NA 3.3 UJ 15 J 0.33 U 0.33 U

RCRA Metals and Cyanide (mg/kg)Arsenic NA NA 2.8 2.5 7.1 J 6.2 JBarium NA NA 68 44 26 26Cadmium NA NA 0.40 U 0.40 U 0.56 U 0.54 UChromium NA NA 6.0 8.4 17 10Lead NA NA 10 6.0 8.0 J 16 JMercury NA NA 0.02 U 0.04 0.049 0.043 USelenium NA NA 0.48 U 0.48 U 0.71 UR 1.1 URSilver NA NA 1.0 U 1.8 2.2 U 2.2 UCyanide (total) NA NA 0.10 U 0.10 U 0.11 U 0.11 UNotes:1) Subsurface soil sample collected during the 1995-1996 site investigation.2) Subsurface soil sample collected during the Hurds Island 1998 subsurface soil investigation.3) J - Estimated value.4) U - Compound/analyte not detected. The associated numerical value is the reporting limit.5) R - The result is unusable. The compound/analyte may or may not be present.6) NA - Not analyzed.



Aurora MGP Site

Sample Location and Depth (feet below ground surface)/Concentration(SP120-001)1 (SP121-001)1 (SP122-001)1 (SP123-001)1 (SP134-001)1 (SP135-001)1

Compound/Analyte 3-7 3-6.5 3-7 3-7 3-7 3-7BTEX / Styrene (mg/kg)

Benzene 0.005 U 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UEthylbenzene 0.005 U 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UToluene 0.005 U 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UXylenes (total) 0.0051 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UStyrene 0.005 U 0.005 U 0.005 U 0.005 U 0.005 U 0.005 U


PAH (mg/kg)Acenaphthene 0.660 U 0.660 UJ 0.660 U 0.660 U 0.660 U 0.660 UAcenaphthylene 0.660 U 0.660 UJ 0.660 U 0.660 U 0.660 U 0.660 UAnthracene 0.660 U 0.660 UJ 0.660 U 0.660 U 0.660 U 0.660 UBenzo(a)anthracene 0.0026 U 0.17 J 0.009 0.015 0.0026 U 0.032Benzo(b)fluoranthene 0.0036 U 0.12 J 0.0036 U 0.010 0.0036 U 0.026Benzo(k)fluoranthene 0.0034 U 0.12 J 0.0034 U 0.0034 U 0.0034 U 0.018Benzo(a)pyrene 0.0046 U 0.39 J 0.0046 U 0.015 0.0046 U 0.032Benzo(g,h,i)perylene 0.051 U 0.54 J 0.051 U 0.051 U 0.051 U 0.051 UChrysene 0.03 U 0.13 J 0.03 U 0.03 U 0.03 U 0.03 UDibenzo(a,h)anthracene 0.006 U 0.049 J 0.006 U 0.006 U 0.006 U 0.006 UFluoranthene 0.660 U 0.660 UJ 0.660 U 0.660 U 0.660 U 0.660 UFluorene 0.14 U 0.14 UJ 0.14 U 0.14 U 0.14 U 0.14 UIndeno(1,2,3-cd)pyrene 0.0086 U 0.38 J 0.0086 U 0.0086 U 0.0086 U 0.042Naphthalene 0.025 U 0.13 J 0.025 U 0.025 U 0.025 U 0.025 UPhenanthrene 0.660 U 0.660 UJ 0.660 U 0.660 U 0.660 U 0.660 UPyrene 0.18 U 0.30 J 0.18 U 0.18 U 0.18 U 0.18 UDibenzofuran 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U2-Methylnaphthalene 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U

RCRA Metals and Cyanide (mg/kg)Arsenic 0.70 J 2.2 J 1.8 J 1.6 J 3.2 J 1.8 JBarium 120 190 130 74 160 J 130 JCadmium 0.66 U 9.1 0.66 U 0.59 U 0.66 U 5.9Chromium 15 48 15 18 17 26Lead 4.0 UR 61 J 5.3 UR 20 J 5.2 UJ 24 JMercury 0.052 U 0.055 U 0.053 U 0.047 U 0.052 U 0.051 USelenium 0.33 UR 0.34 UR 0.40 J 0.52 UR 0.33 UJ 0.32 UJSilver 2.6 U 2.7 U 2.6 U 2.3 U 2.6 U 2.5 UCyanide (total) 0.13 U 0.14 U 0.13 U 0.12 U 0.13 U 0.13 UNotes:1) Subsurface soil sample collected during the Hurds Island 1998 subsurface soil investigation.2) J - Estimated value.3) U - Compound/analyte not detected. The associated numerical value is the reporting limit.4) R - The result is unusable. The compound/analyte may or may not be present.



Aurora MGP Site

Sample Location and Depth (feet below ground surface)/Concentration(SP136-001)1 (SP137-001)1 * (SP142-001)2 (SP143-001)2 (SP144-001)2 (SP144-002)2


Benzene 0.01 U 1.9 U 0.006 U 0.008 UJ 0.007 U 0.5 UJEthylbenzene 0.01 U 3.7 0.006 U 0.008 UJ 0.007 U 5.5 JToluene 0.01 U 1.9 U 0.006 U 0.008 UJ 0.007 U 0.5 UJXylenes (total) 0.01 U 15 0.006 U 0.008 UJ 0.007 U 2.3 JStyrene 0.01 U 1.9 U 0.006 U 0.008 UJ 0.007 U 0.5 UJ

Phenols (mg/kg)2,4-Dimethylphenol 0.33 U 4.3 UJ 0.40 U 0.52 U 0.46 U 18 UJ2-Methylphenol (O-cresol) 0.33 U 4.3 UJ 0.40 U 0.52 U 0.46 U 18 UJ4-Methylphenol (P-cresol) 0.33 U 4.3 UJ 0.40 U 0.52 U 0.46 U 18 UJPhenol 0.33 U 4.3 UJ 0.40 U 0.52 U 0.46 U 18 UJ

PAH (mg/kg)Acenaphthene 0.660 U 170 J 0.024 U 0.032 UJ 0.28 UJ 30 JAcenaphthylene 0.660 U 4 UJ 0.024 U 0.032 UJ 0.28 UJ 1.3 JAnthracene 0.660 U 150 J 0.048 U 0.063 UJ 0.55 UJ 25 JBenzo(a)anthracene 0.026 42 J 0.012 0.0041 UJ 24 J 10 JBenzo(b)fluoranthene 0.020 15 J 0.0043 U 0.0057 UJ 21 J 3.1 JBenzo(k)fluoranthene 0.013 13 J 0.0041 U 0.0054 UJ 18 J 2.4 JBenzo(a)pyrene 0.0046 U 39 J 0.0055 U 0.017 J 54 J 8.2 JBenzo(g,h,i)perylene 0.051 U 15 J 0.048 U 0.063 UJ 29 J 4.0 JChrysene 0.03 U 37 J 0.04 U 0.05 UJ 10 J 6.3 JDibenzo(a,h)anthracene 0.006 U 3.1 J 0.007 U 0.009 UJ 0.08 UJ 0.57 JFluoranthene 0.660 U 170 J 0.024 U 0.032 UJ 18 J 36 JFluorene 0.14 U 100 J 0.024 U 0.041 J 0.28 UJ 17 JIndeno(1,2,3-cd)pyrene 0.0086 U 12 J 0.010 U 0.014 UJ 26 J 3.4 JNaphthalene 0.025 U 270 J 0.23 9.0 J 2.1 J 16 JPhenanthrene 0.660 U 300 J 0.048 U 0.092 J 0.80 J 55 JPyrene 0.18 U 120 J 0.024 U 0.041 J 18 J 27 JDibenzofuran 0.33 U 18 J 0.40 U 0.52 U 1.43 15 J2-Methylnaphthalene 0.33 U 44 J 0.40 U 2.7 1.1 77 J

RCRA Metals and Cyanide (mg/kg)Arsenic 72 J 19 J NA NA NA 1.7Barium 75 J 140 J NA NA NA 3.9Cadmium 0.50 U 3.5 NA NA NA 0.54 UChromium 15 27 NA NA NA 3.9Lead 4.0 UJ 100 J NA NA NA 4.3 UMercury 0.21 0.33 NA NA NA 0.079Selenium 0.35 UJ 0.25 UJ NA NA NA 0.27 USilver 2.8 U 2 U NA NA NA 2.1 UCyanide (total) 1.7 1.4 NA NA NA 1.1 UNotes:1) Subsurface soil sample collected during the Hurds Island 1998 subsurface soil investigation.2) Subsurface soil sample collected in August 1998 to determine whether source material was present.3) J - Estimated value.4) U - Compound/analyte not detected. The associated numerical value is the reporting limit.5) NA - Not analyzed.6) * PAH analysis was performed using analytical method SW-846 8310.


Table C-6Hurds Island SI Subsurface Soil Physical Parameter Results

Aurora MGP Site

Sample Location and Depth (feet below ground surface)/Results SP113-001 SP119-001 SP120-001 SP121-001 SP122-001 SP123-001 SP134-001 SP135-001 SP136-001

Parameter 3-4 3-6 3-7 3-6.5 3-7 3-7 3-7 3-7 3-5Organic carbon content (%) 4.10 0.82 2.74 1.69 1.70 3.07 4.63 2.51 3.12pH 8.14 8.00 8.29 8.34 8.28 8.37 8.42 8.19 7.79


Table C-7Hurds Island SI Potential Source Material Analytical Results

Aurora MGP Site

Sample Location and Depth (feet below ground surface)/Concentration (SP51-001)¹ SP107-001 SP137-001 TP01-001

Analyte/Parameter (Units) 8-12 8-12 8-12 5-6Miscellaneous Analyses

Flashpoint (Degree F) >200 >212 >212 >212pH NA 7.54 6.81 7.91BTU (BTU/lb) 7620 513 NA 1592Cyanide, Reactive (µg/g) 50 U 10 U 10 U 10 UMoisture, Karl Fischer (%) 16.2 9.8 NA 21.1Oil & Grease (%) 0.24 NA NA NAOil & Grease (µg/g) NA 11 1.4 63Sulfide, Reactive (µg/g) 50 U 10 U 10 U 10 UBulk Density (g/cm³) NA 1.67 83.66 1.69EOX (µg/g) NA 10 U 10 U 10 UTCLP Cyanide (mg/l) NA NA 0.006 NA

Inorganic Toxicity Characteristic Leaching Procedure (mg/l)Arsenic 0.0050 U 0.20 U 0.20 U NABarium 0.790 1.16 0.5 NACadmium 0.010 U 0.010 U 0.010 U NAChromium 0.040 U 0.114 0.045 NALead 0.0050 U 0.475 0.080 U NAMercury 0.0004 U 0.0004 U 0.0004 U NASelenium 0.0050 U 0.20 U 0.20 U NASilver 0.040 U 0.040 U 0.040 U NA

Volatile Toxicity Characteristic Leaching Procedure (mg/l)Benzene 0.020 U 0.020 U 0.020 U 0.020 UCarbon Tetrachloride 0.020 U 0.020 U 0.020 U 0.020 UChlorobenzene 0.020 U 0.020 U 0.020 U 0.020 UChloroform 0.020 U 0.020 U 0.020 U 0.020 U1,4-Dichlorobenzene 0.020 U 0.020 U 0.020 U 0.020 U1,2-Dichloroethane 0.020 U 0.020 U 0.020 U 0.020 U1,1-Dichloroethene 0.020 U 0.020 U 0.020 U 0.020 UMethyl Ethyl Ketone 0.40 U 0.40 U 0.40 U 0.40 UTetrachloroethene 0.020 U 0.020 U 0.020 U 0.020 UTrichloroethene 0.020 U 0.020 U 0.020 U 0.020 UVinyl chloride 0.020 U 0.020 U 0.020 U 0.020 U

BNA Toxicity Characteristic Leaching Procedure (mg/l)Cresols 0.10 U 0.10 U 0.10 U 0.10 U3-Methylphenol (m-cresol) 0.10 U 0.10 U 0.10 U 0.10 U2-Methylphenol (o-cresol) 0.10 U 0.10 U 0.10 U 0.10 U4-Methylphenol (p-cresol) 0.10 U 0.10 U 0.10 U 0.10 UPentachlorophenol 0.50 U 0.50 U 0.50 U 0.50 U2,4,5-Trichlorophenol 0.50 U 0.50 U 0.50 U 0.50 U2,4,6-Trichlorophenol 0.10 U 0.10 U 0.10 U 0.10 U1,4-Dichlorobenzene 0.10 U 0.10 U 0.10 U 0.10 UHexachloroethane 0.10 U 0.10 U 0.10 U 0.10 UNotes:1) Subsurface soil sample collected during the 1995-1996 site investigation.2) NA - Not analyzed.3) U - Compound/analyte not detected. The associated numerical value is the reporting limit.


Table C-7 (Continued)Hurds Island SI Potential Source Material Analytical Results

Aurora MGP Site

Sample Location and Depth (feet below ground surface)/Concentration (SP51-001)¹ SP107-001 SP137-001 TP01-001

Analyte/Parameter (Units) 8-12 8-12 8-12 5-6BNA Toxicity Characteristic Leaching Procedure (mg/l) (Continued)

Nitrobenzene 0.10 U 0.10 U 0.10 U 0.10 UHexachlorobutadiene 0.10 U 0.10 U 0.10 U 0.10 U2,4-Dinitrotoluene 0.10 U 0.10 U 0.10 U 0.10 UHexachlorobenzene 0.10 U 0.10 U 0.10 U 0.10 UPyridine 0.10 U 0.10 U 0.10 U 0.10 U

Polychlorinated Biphenyls (ug/kg)PCB-1016 NA 40 U 100 U 40 UPCB-1221 NA 40 U 100 U 40 UPCB-1232 NA 40 U 100 U 40 UPCB-1242 NA 40 U 100 U 40 UPCB-1248 NA 40 U 100 U 40 UPCB-1254 NA 40 U 100 U 40 UPCB-1260 NA 40 U 100 U 40 UNotes:1) Subsurface soil sample collected during the 1995-1996 site investigation.2) NA - Not analyzed.3) U - Compound/analyte not detected. The associated numerical value is the reporting limit.


Table C-8Hurds Island SI Subsurface Soil Target Compound List (TCL) Analytical Results

and Total Petroleum Hydrocarbons (TPH) Analytical ResultsAurora MGP Site

Sample Location and Depth (feet below ground surface)/Concentration (SB20-002)¹ (SB21-003)¹ (SB28a-002)¹ (SB29a-002)¹ (SP51-001)¹

Compound 8-10 26-28 6-8 8-10 8-12TCL Volatiles (mg/kg)

Acetone 11 5.0 U 5.0 U 5.0 U 5.0 UBenzene 0.25 U 0.25 U 0.25 U 0.25 U 0.25 UBromodichloromethane 0.25 U 0.25 U 0.25 U 0.25 U 0.50 UBromoform 0.25 U 0.25 U 0.25 U 0.25 U 0.25 UBromomethane 0.50 U 0.5 U 0.50 U 0.50 U 0.50 U2-Butanone 5.0 U 5.0 U 5.0 U 5.0 U 0.50 UCarbon disulfide 5.0 U 5.0 U 5.0 U 5.0 U 0.50 UCarbon tetrachloride 0.25 U 0.25 U 0.25 U 0.25 U 0.25 UChlorobenzene 0.25 U 0.25 U 0.25 U 0.25 U 0.25 UChloroethane 0.50 U 0.50 U 0.50 U 0.50 U 0.50 UChloroform 0.25 U 0.25 U 0.25 U 0.25 U 0.25 UChloromethane 0.50 U 0.50 U 0.50 U 0.50 U 0.50 UChlorodibromomethane 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U1,1-Dichloroethane 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U1,2-Dichloroethane 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U1,1-Dichloroethene 0.25 U 0.25 U 0.25 U 0.25 U 0.25 Ucis-1,2-Dichloroethene 0.25 U 0.25 U 0.25 U 0.25 U 0.25 Utrans-1,2-Dichloroethene 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U1,2-Dichloropropane 0.25 U 0.25 U 0.25 U 0.25 U 0.25 Ucis-1,3-Dichloropropene 0.25 U 0.25 U 0.25 U 0.25 U 0.25 Utrans-1,3-Dichloropropene 0.25 U 0.25 U 0.25 U 0.25 U 0.25 UEthylbenzene 0.25 U 0.25 U 0.25 U 0.25 U 1.7 2-Hexanone 2.5 U 2.5 U 2.5 U 2.5 U 0.50 U4-Methyl-2-pentanone 2.5 U 2.5 U 2.5 U 2.5 U 0.50 UMethlene chloride 0.25 U 0.25 U 0.25 U 0.25 U 0.25 UStyrene 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U1,1,2,2-Tetrachloroethane 0.25 U 0.25 U 0.25 U 0.25 U 0.25 UTetrachloroethane 0.25 U 0.25 U 0.25 U 0.25 U 0.25 UToluene 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U1,1,1-Trichloroethane 0.25 U 0.25 U 0.25 U 0.25 U 0.25 U1,1,2-Trichloroethane 0.25 U 0.25 U 0.25 U 0.25 U 0.25 UTrichloroethene 0.25 U 0.25 U 0.25 U 0.25 U 0.25 UVinly chloride 0.50 U 0.50 U 0.50 U 0.50 U 0.50 UXylenes (total) 0.25 U 0.25 U 0.25 U 0.25 U 1.8 TICs (Total) NA NA NA NA NANotes:1) Subsurface soil sample collected during the 1995-1996 site investigation.2) U - Compound/analyte not detected. The associated numerical value is the reporting limit.3) NA - Not analyzed.


Table C-8 (Continued)Hurds Island SI Subsurface Soil Target Compound List (TCL) Analytical Results



Compound 8-10 26-28 6-8 8-10 8-12TCL Semivolatiles (mg/kg)

4-Chloro-3-methylphenol 1.3 U 1.3 U 1.3 U 1.3 U NA2-Chlorophenol 0.66 U 0.66 U 0.66 U 0.66 U NA2,4-Dichlorophenol 0.66 U 0.66 U 0.66 U 0.66 U NA2,4-Dimethylphenol 0.66 U 0.66 U 0.66 U 0.66 U NA2,4-Dinitrophenol 3.3 UR 3.3 UR 3.3 U 3.3 UR NA2-Methyl-4,6-dinitrophenol 3.3 U 3.3 U 3.3 U 3.3 U NA2-Methylphenol (O-cresol) 0.66 U 0.66 U 0.66 U 0.66 U NA4-Methylphenol (P-cresol) 0.66 U 0.66 U 0.66 U 0.66 U NA2-Nitrophenol 0.66 U 0.66 U 0.66 U 0.66 U NA4-Nitrophenol 3.3 U 3.3 U 3.3 U 3.3 U NAPentachlorophenol 3.3 U 3.3 U 3.3 U 3.3 U NAPhenol 0.66 U 0.66 U 0.66 U 0.66 U NA2,4,5-Trichlorophenol 0.66 U 0.66 U 0.66 U 0.66 U NA2,4,6-Trichlorophenol 0.66 U 0.66 U 0.66 U 0.66 U NABenzyl butyl phthalate 0.66 U 0.66 U 0.66 U 0.66 U NABis(2-chloroethoxy)methane 0.66 U 0.66 U 0.66 U 0.66 U NABis(2-chloroethyl)ether 0.66 U 0.66 U 0.66 U 0.66 U NABis(2-chloroisopropyl)ether 0.66 U 0.66 U 0.66 U 0.66 U NABis(2-ethylhexyl)phthalate 0.66 U 0.66 U 0.66 U 0.66 U NA4-Bromophenyl phenyl ether 0.66 U 0.66 U 0.66 U 0.66 U NACarbazole 0.66 U 0.66 U 0.66 U 0.66 U NA4-Chloroaniline 1.3 U 1.3 U 1.3 U 1.3 U NA2-Chloronaphthalene 0.66 U 0.66 U 0.66 U 0.66 U NA4-Chlorophenyl phenyl ether 0.66 U 0.66 U 0.66 U 0.66 U NADibenzofuran 0.66 U 0.66 U 0.66 U 0.66 U NADi-n-butyl phthalate 0.66 U 0.66 U 0.66 U 0.66 U NA1,2-Dichlorobenzene 0.66 U 0.66 U 0.66 U 0.66 U NA1,3-Dichlorobenzene 0.66 U 0.66 U 0.66 U 0.66 U NA1,4-Dichlorobenzene 0.66 U 0.66 U 0.66 U 0.66 U NA3,3-Dichlorobenzidine 1.3 U 1.3 U 1.3 U 1.3 U NADiethyl phthalate 0.66 U 0.66 U 0.66 U 0.66 U NADimethyl phthalate 0.66 U 0.66 U 0.66 U 0.66 U NA2,4-Dinitrotoluene 0.66 U 0.66 U 0.66 U 0.66 U NA2,6-Dinitrotoluene 0.66 U 0.66 U 0.66 U 0.66 U NADi-n-octyl phthalate 0.66 U 0.66 U 0.66 U 0.66 U NAHexachlorobenzene 0.66 U 0.66 U 0.66 U 0.66 U NANotes:1) Subsurface soil sample collected during the 1995-1996 site investigation.2) U - Compound/analyte not detected. The associated numerical value is the reporting limit.3) NA - Not analyzed.4) R - The result is unusable. The compound/analyte may or may not be present.


Table C-8 (Continued)Hurds Island SI Summary of Subsurface Soil Target Compound List (TCL) Analytical Results



Compound 8-10 26-28 6-8 8-10 8-12TCL Semivolatiles (Continued) (mg/kg)

Hexachlorobutadiene 0.66 U 0.66 U 0.66 U 0.66 U NAHexachlorocyclopentadiene 0.66 U 0.66 U 0.66 U 0.66 U NAHexachloroethane 0.66 U 0.66 U 0.66 U 0.66 U NAIsophorone 0.66 U 0.66 U 0.66 U 0.66 U NA2-Methylnaphthalene 0.66 U 0.66 U 0.66 U 0.66 U NA2-Nitroaniline 3.3 U 3.3 U 3.3 U 3.3 U NA3-Nitroaniline 3.3 U 3.3 U 3.3 U 3.3 U NA4-Nitroaniline 1.3 U 1.3 U 1.3 U 1.3 U NANitrobenzene 0.66 U 0.66 U 0.66 U 0.66 U NAN-nitrosodimethylamine 0.66 U 0.66 U 0.66 U 0.66 U NAN-nitrosodi-n-propylamine 0.66 U 0.66 U 0.66 U 0.66 U NAN-nitrosodiphenylamine 0.66 U 0.66 U 0.66 U 0.66 U NA1,2,4-Trichlorobenzene 0.66 U 0.66 U 0.66 U 0.66 U NAAcenaphthene 1.20 U 1.20 U 1.20 U 1.20 U NAAcenaphthylene 1.54 U 1.54 U 1.54 U 1.54 U NAAnthracene 0.440 U 0.440 U 0.440 U 0.440 U NABenzo(a)anthracene 0.0087 U 0.091 0.181 U 0.181 U NABenzo(b)fluoranthene 0.012 U 0.034 0.100 U 0.100 U NABenzo(k)fluoranthene 0.011 U 0.023 0.148 U 0.148 U NABenzo(a)pyrene 0.015 U 0.082 0.112 U 0.112 U NABenzo(g,h,i)perylene 0.051 U 0.051 U 0.100 U 0.100 U NAChrysene 0.100 U 0.100 U 0.100 U 0.100 U NADibenzo(a,h)anthracene 0.020 U 0.020 U 0.060 U 0.060 U NAFluoranthene 0.140 U 0.140 U 0.140 U 0.140 U NAFluorene 0.140 U 0.279 0.140 U 0.140 U NAIndeno(1,2,3-cd)pyrene 0.028 U 0.028 U 0.096 U 0.096 U NANaphthalene 1.20 U 1.20 U 1.20 U 1.20 U NAPhenanthrene 0.428 U 0.453 0.718 J 0.428 U NAPyrene 0.180 U 0.180 U 0.302 J 0.223 U NATICs (Total) NA NA NA NA NA

TPH (mg/kg)Gas 10 U 10 U NA NA NADiesel 10 U 10 U NA NA NAOil 10 U 10 U NA NA NANotes:1) Subsurface soil sample collected during the 1995-1996 site investigation.2) NA - Not analyzed.3) U - Compound/analyte not detected. The associated numerical value is the reporting limit.4) J - Estimated value.




Sample Location and Depth (feet below ground surface)/Concentration (SP137-001)¹ * (SP142-001)² (SP143-001)² (SP144-001)² (SP144-002)²

Compound 3-7 4-6 4-6 5-6 15-16TCL Volatiles (mg/kg)

Acetone 38 U 0.12 U 0.16 UJ 0.14 U 11 UJBenzene 1.9 U 0.006 U 0.008 UJ 0.007 U 0.5 UJBromodichloromethane 1.9 U 0.01 U 0.02 UJ 0.01 U 1.0 UJBromoform 1.9 U 0.006 U 0.008 U 0.007 U 0.5 UJBromomethane 1.9 U 0.01 U 0.02 UJ 0.01 U 1.0 UJ2-Butanone 38 U 0.01 U 0.02 UJ 0.01 U 1.0 UJCarbon disulfide 38 U 0.01 U 0.02 UJ 0.01 U 1.0 UJCarbon tetrachloride 1.9 U 0.006 U 0.008 UJ 0.007 U 0.5 UJChlorobenzene 1.9 U 0.006 U 0.008 UJ 0.007 U 0.5 UJChloroethane 1.9 U 0.01 U 0.02 UJ 0.01 U 1.0 UJChloroform 1.9 U 0.006 U 0.008 UJ 0.007 U 0.5 UJChloromethane 1.9 U 0.01 U 0.02 UJ 0.01 U 1.0 UJChlorodibromomethane 1.9 U 0.006 U 0.008 UJ 0.007 U 0.5 UJ1,1-Dichloroethane 1.9 U 0.006 U 0.008 UJ 0.007 U 0.5 UJ1,2-Dichloroethane 1.9 U 0.006 U 0.008 UJ 0.007 U 0.5 UJ1,1-Dichloroethene 1.9 U 0.005 U 0.006 UJ 0.006 U 0.4 UJcis-1,2-Dichloroethene 1.9 U 0.005 U 0.006 UJ 0.006 U 0.4 UJtrans-1,2-Dichloroethene 1.9 U 0.006 U 0.008 UJ 0.007 U 0.5 UJ1,2-Dichloropropane 1.9 U 0.006 U 0.008 UJ 0.007 U 0.5 UJcis-1,3-Dichloropropene 1.9 U 0.006 U 0.008 UJ 0.007 U 0.5 UJtrans-1,3-Dichloropropene 1.9 U 0.006 U 0.008 UJ 0.007 U 0.5 UJEthylbenzene 3.7 0.006 U 0.008 UJ 0.007 U 5.5 J2-Hexanone 38 U 0.01 U 0.02 UJ 0.01 U 1.0 UJ4-Methyl-2-pentanone 38 U 0.01 U 0.02 UJ 0.01 U 0.5 UJMethlene chloride 19 U 0.006 U 0.008 UJ 0.007 U 1.0 UJStyrene 1.9 U 0.006 U 0.008 UJ 0.007 U 0.5 UJ1,1,2,2-Tetrachloroethane 1.9 U 0.006 U 0.008 UJ 0.007 U 0.5 UJTetrachloroethene 1.9 U 0.006 U 0.008 UJ 0.007 U 0.5 UJToluene 1.9 U 0.006 U 0.008 UJ 0.007 U 0.5 UJ1,1,1-Trichloroethane 1.9 U 0.006 U 0.008 UJ 0.007 U 0.5 UJ1,1,2-Trichloroethane 1.9 U 0.006 U 0.008 UJ 0.007 U 0.5 UJTrichloroethene 1.9 U 0.006 U 0.008 UJ 0.007 U 0.5 UJVinly chloride 1.9 U 0.01 U 0.02 UJ 0.01 U 1.0 UJXylenes (total) 15 0.006 U 0.008 UJ 0.007 U 2.3 JTICs (Total) 222 0.0 0.0 0.0 177.4Notes:1) Subsurface soil sample collected during the 1998 subsurface soil investigation.2) Subsurface soil sample collected in August 1998 to determine whether source material exists.3) U - Compound/analyte not detected. The associated numerical value is the reporting limit.4) J - Estimated value.5) * PAH analysis was performed using analytical method SW-846 8270.





Compound 3-7 4-6 4-6 5-6 15-16TCL Semivolatiles (mg/kg)

4-Chloro-3-methylphenol 4.3 U 0.40 U 0.52 U 0.46 U 18 UJ2-Chlorophenol 4.3 U 0.40 U 0.52 U 0.46 U 18 UJ2,4-Dichlorophenol 4.3 U 0.40 U 0.52 U 0.46 U 18 UJ2,4-Dimethylphenol 4.3 U 0.40 U 0.52 U 0.46 U 18 UJ2,4-Dinitrophenol 21 U 1.9 U 2.5 U 2.2 U 85 UJ2-Methyl-4,6-dinitrophenol 21 U 1.9 U 2.5 U 2.2 U 85 UJ2-Methylphenol (O-cresol) 4.3 U 0.40 U 0.52 U 0.46 U 18 UJ4-Methylphenol (P-cresol) 4.3 U 0.40 U 0.52 U 0.46 U 18 UJ2-Nitrophenol 4.3 U 0.40 U 0.52 U 0.46 U 18 UJ4-Nitrophenol 21 U 1.9 U 2.5 U 2.2 U 85 UJPentachlorophenol 21 U 1.9 U 2.5 U 2.2 U 85 UJPhenol 4.3 U 0.40 U 0.52 U 0.46 U 18 UJ2,4,5-Trichlorophenol 4.3 U 0.40 U 0.52 U 0.46 U 18 UJ2,4,6-Trichlorophenol 4.3 U 0.40 U 0.52 U 0.46 U 18 UJBenzyl butyl phthalate 4.3 UJ 0.40 U 0.52 U 0.46 U 18 UJBis(2-chloroethoxy)methane 4.3 UJ 0.40 U 0.52 U 0.46 U 18 UJBis(2-chloroethyl)ether 4.3 UJ 0.40 U 0.52 U 0.46 U 18 UJBis(2-chloroisopropyl)ether 4.3 UJ 0.40 U 0.52 U 0.46 U 18 UJBis(2-ethylhexyl)phthalate 4.3 UJ 0.40 U 0.52 U 0.46 U 18 UJ4-Bromophenyl phenyl ether 4.3 UJ 0.40 U 0.52 U 0.46 U 18 UJCarbazole 4.3 UJ 0.40 U 0.52 U 0.46 U 18 UJ4-Chloroaniline 4.3 UJ 0.40 U 0.52 U 0.46 U 18 UJ2-Chloronaphthalene 4.3 UJ 0.40 U 0.52 U 0.46 U 18 UJ4-Chlorophenyl phenyl ether 4.3 UJ 0.40 U 0.52 U 0.46 U 18 UJDibenzofuran 18 0.40 U 0.52 U 1.43 15 JDi-n-butyl phthalate 4.3 UJ 0.40 U 0.52 U 0.46 U 18 UJ1,2-Dichlorobenzene 4.3 U 0.40 U 0.52 U 0.46 U 18 UJ1,3-Dichlorobenzene 4.3 UJ 0.40 U 0.52 U 0.46 U 18 UJ1,4-Dichlorobenzene 4.3 UJ 0.40 U 0.52 U 0.46 U 18 UJ3,3-Dichlorobenzidine 8.6 UJ 0.79 U 1.0 U 0.91 U 36 UJDiethyl phthalate 4.3 UJ 0.40 U 0.52 U 0.46 U 18 UJDimethyl phthalate 4.3 UJ 0.40 U 0.52 U 0.46 U 18 UJ2,4-Dinitrotoluene 4.3 UJ 0.40 U 0.52 U 0.46 U 18 UJ2,6-Dinitrotoluene 4.3 UJ 0.40 U 0.52 U 0.46 U 18 UJDi-n-octyl phthalate 4.3 UJ 0.40 U 0.52 U 0.46 U 18 UJHexachlorobenzene 4.3 UJ 0.40 U 0.52 U 0.46 U 18 UJNotes:1) Subsurface soil sample collected during the 1998 subsurface soil investigation.2) Subsurface soil sample collected in August 1998 to determine whether source material exists.3) U - Compound/analyte not detected. The associated numerical value is the reporting limit.4) J - Estimated value.5) * - PAH analysis was performed using analytical method SW-846 8270.





Compound 3-7 4-6 4-6 5-6 15-16TCL Semivolatiles (Continued) (mg/kg)

Hexachlorobutadiene 4.3 UJ 0.40 U 0.52 U 0.46 U 18 UJHexachlorocyclopentadiene 4.3 UJ 0.40 U 0.52 U 0.46 U 18 UJHexachloroethane 4.3 UJ 0.40 U 0.52 U 0.46 U 18 UJIsophorone 4.3 UJ 0.40 U 0.52 U 0.46 U 18 UJ2-Methylnaphthalene 0.4 UJ 0.40 U 2.7 1.1 77 J2-Nitroaniline 21 UJ 1.9 U 2.5 U 2.2 U 85 UJ3-Nitroaniline 21 UJ 1.9 U 2.5 U 2.2 U 85 UJ4-Nitroaniline 21 UJ 1.9 U 2.5 U 2.2 U 85 UJNitrobenzene 4.3 UJ 0.40 U 0.52 U 0.46 U 18 UJN-nitrosodimethylamine 4.3 UJ 0.40 U 0.52 U 0.46 U 18 UJN-nitrosodi-n-propylamine 4.3 UJ 0.40 U 0.52 U 0.46 U 18 UJN-nitrosodiphenylamine 4.3 UJ 0.40 U 0.52 U 0.46 U 18 UJ1,2,4-Trichlorobenzene 4.3 UJ 0.40 U 0.52 U 0.46 U 18 UJAcenaphthene 160 J 0.024 U 0.032 UJ 0.28 UJ 30 JAcenaphthylene 4.3 J 0.024 U 0.032 UJ 0.28 UJ 1.3 JAnthracene 64 J 0.048 U 0.063 UJ 0.55 UJ 25 JBenzo(a)anthracene 35 J 0.0120 0.0041 UJ 24 J 10 JBenzo(b)fluoranthene 18 J 0.0043 U 0.0057 UJ 21 J 3.1 JBenzo(k)fluoranthene 17 J 0.0041 U 0.0054 UJ 18 J 2.4 JBenzo(a)pyrene 31 J 0.0055 U 0.017 UJ 54 J 8.2 JBenzo(g,h,i)perylene 13 J 0.048 U 0.063 UJ 29 J 4.0 JChrysene 31 J 0.04 U 0.050 UJ 10 J 6.3 JDibenzo(a,h)anthracene 4.3 UJ 0.007 U 0.009 UJ 0.08 UJ 0.57 JFluoranthene 82 J 0.024 U 0.032 UJ 18 J 36 JFluorene 64 J 0.024 U 0.041 J 0.28 UJ 17 JIndeno(1,2,3-cd)pyrene 11 J 0.010 U 0.014 UJ 26 J 3.4 JNaphthalene 270 J 0.23 9.0 J 2.1 J 16 JPhenanthrene 210 J 0.048 U 0.092 J 0.8 J 55 JPyrene 100 J 0.024 U 0.041 UJ 18 J 27 JTICs (Total) NA 47.29 48.7 367 133.2

TPH (mg/kg)Gas NA NA NA NA NADiesel NA NA NA NA NAOil NA NA NA NA NANotes:1) Subsurface soil sample collected during the 1998 subsurface soil investigation.2) Subsurface soil sample collected in August 1998 to determine whether source material exists.3) NA - Not analyzed.4) J - Estimated value.5) U - Compound/analyte not detected. The associated numerical value is the reporting limit.6) * PAH analysis was performed using analytical method SW-846 8270.


APPENDIX D STOREROOM FACILITY SI ANALYTICAL RESULTS TABLES

AND INVESTIGATION ACTIVITIES MAP SUPPLEMENTAL SITE INVESTIGATION

AURORA MGP SITE

Table D-1Storeroom Facility SI Surface Soil Analytical Results

Aurora MGP Site

Sample Location and Depth (feet below ground surface)/ConcentrationSP145-001 SP146-001 SP147-001 SP150-001

Compound/Analyte 0-3 0-3 0-3 0-3BTEX and Styrene (mg/kg)

Benzene 0.02 UJ 0.026 UJ 0.025 UJ 0.061 JEthylbenzene 0.09 U 0.1 U 0.1 U 0.1 UToluene 0.09 U 0.1 U 0.1 U 0.25Xylenes (total) 0.09 U 0.1 U 0.1 U 0.41Styrene 0.09 U 0.1 U 0.1 U 0.1 U

Phenols (mg/kg)2,4-Dimethylphenol 0.35 U NA 0.37 U 0.44 U2-Methylphenol 0.35 U NA 0.37 U 0.44 U3-, 4-Methylphenol 0.35 U NA 0.37 U 0.44 UPhenol 0.35 U NA 0.37 U 0.44 U

PAHs (mg/kg)Acenaphthene 0.34 NA 0.72 0.24Acenaphthylene 0.8 U NA 0.53 1.0 UAnthracene 1.47 NA 2.38 1.2Benzo(a)anthracene 2.5 NA 11.9 4.06Benzo(b)fluoranthene 1.41 NA 3.89 2.41Benzo(k)fluoranthene 1.62 NA 3.9 2.55Benzo(a)pyrene 2.27 NA 9.61 3.6Benzo(g,h,i)perylene 1.57 NA 4.17 2.17Chrysene 2.73 NA 8.86 4.05Dibenzo(a,h)anthracene 0.77 NA 1.92 1.35Fluoranthene 6.16 NA 24.3 6.79Fluorene 0.41 NA 0.65 0.2Indeno(1,2,3-cd)pyrene 1.51 NA 3.89 2.16Naphthalene 0.17 NA 1.57 0.26Phenanthrene 4.34 NA 12 3.65Pyrene 4.81 NA 15.3 5.89Dibenzofuran 0.35 U NA 0.48 0.44 U2-Methylnaphthalene 0.35 U NA 0.37 U 0.44 U

RCRA Metals and Cyanide (mg/kg)Arsenic 116 J NA 201 J 69 JBarium 25 J NA 13 J 100 JCadmium 2.5 NA 6.2 3.7Chromium 6.3 J NA 7.9 J 12 JLead 15 NA 19 120Mercury 0.042 U NA 0.1 0.15Selenium 0.53 UJR NA 0.56 UJR 0.66 UJRSilver 2.1 U NA 2.2 U 2.6 UCyanide 0.26 U NA 0.28 U 0.81Notes:(1) J - Estimated value.(2) U - Compound/analyte not detected. The associated numerical value is the reporting limit.(3) R - The result is unusable. The compound/analyte may or may not be present.(4) NA - Not analyzed.


Table D-2Storeroom Facility SI Subsurface Soil Analytical Results

Aurora MGP Site


Compound/Analyte 8-10 12-15 8-10 12-15 4-8 4-10BTEX and Styrene (mg/kg)

Benzene 0.02 UJ 0.021 UJ 0.063 J 0.25 0.077 J NAEthylbenzene 0.1 U 0.77 0.09 U 2.9 0.1 U NAToluene 0.1 U 0.1 U 0.09 U 0.09 U 0.1 U NAXylenes (total) 0.1 U 0.95 0.18 4.1 0.1 U NAStyrene 0.1 U 0.1 U 0.09 U 0.09 U 0.1 U NA

Phenols (mg/kg)2,4-Dimethylphenol 0.39 U 0.35 U 0.38 U 3.5 U NA 0.40 U2-Methylphenol 0.39 U 0.35 U 0.38 U 3.5 U NA 0.40 U3-, 4-Methylphenol 0.39 U 0.35 U 0.38 U 3.5 U NA 0.40 UPhenol 0.39 U 0.35 U 0.38 U 3.5 U NA 0.40 U

PAHs (mg/kg)Acenaphthene 0.07 0.22 0.20 1.31 NA 0.049 UAcenaphthylene 0.057 U 0.07 0.16 0.46 NA 0.049 UAnthracene 0.29 0.22 0.30 0.95 NA 0.049 UBenzo(a)anthracene 0.61 0.28 0.83 0.56 NA 0.049 UBenzo(b)fluoranthene 0.35 0.13 0.36 0.17 NA 0.049 UBenzo(k)fluoranthene 0.36 0.14 0.31 0.15 NA 0.049 UBenzo(a)pyrene 0.51 0.20 0.63 0.28 NA 0.049 UBenzo(g,h,i)perylene 0.36 0.12 0.41 0.12 NA 0.049 UChrysene 0.63 0.27 0.60 0.40 NA 0.049 UDibenzo(a,h)anthracene 0.19 0.07 0.25 0.9 U NA 0.049 UFluoranthene 1.48 0.55 1.25 0.92 NA 0.049 UFluorene 0.06 0.35 0.28 2.08 NA 0.049 UIndeno(1,2,3-cd)pyrene 0.36 0.13 0.51 0.16 NA 0.049 UNaphthalene 0.08 1.12 0.18 10.5 NA 0.049 UPhenanthrene 0.93 1.34 1.26 6.55 NA 0.049 UPyrene 1.2 0.39 0.94 1.12 NA 0.049 UDibenzofuran 0.39 U 0.35 U 0.38 U 3.5 U NA 0.40 U2-Methylnaphthalene 0.39 U 5.8 1.4 18 NA 0.40 U

RCRA Metals and Cyanide (mg/kg)Arsenic 18 J 4.7 J 4.4 J 1.4 J NA 52 JBarium 110 J 11 J 25 J 11 J NA 65 JCadmium 0.60 U 0.53 U 0.90 0.54 U NA 0.93Chromium 17 J 3.0 J 6.5 J 2.1 J NA 16 JLead 13 4.3 U 13 4.3 U NA 12Mercury 0.048 U 0.043 U 0.049 0.043 U NA 0.049 USelenium 0.60 UJR 0.53 UR 0.57 UR 0.54 UR NA 0.61 URSilver 2.4 U 2.1 U 2.3 U 2.1 U NA 2.4 UCyanide 0.30 U 0.27 U 0.29 U 0.27 U NA 0.30 UNotes:1) J - Estimated value.2) U - Compound/analyte not detected. The associated numerical value is the reporting limit.3) R - The result is unusable. The compound/analyte may or may not be present.4) NA - Not analyzed.


Table D-2 (Continued)Storeroom Facility SI Subsurface Soil Analytical Results

Aurora MGP Site



Benzene 0.032 UJ 0.079 J NA 0.67 0.032 UJ NAEthylbenzene 0.1 U 0.1 U NA 18 0.1 U NAToluene 0.1 U 0.1 U NA 0.13 0.1 U NAXylenes (total) 0.1 U 0.1 U NA 22 0.1 U NAStyrene 0.1 U 0.1 U NA 0.09 U 0.1 U NA

Phenols (mg/kg)2,4-Dimethylphenol 0.40 U NA 4.0 U 3.6 U NA 0.37 U2-Methylphenol 0.40 U NA 4.0 U 3.6 U NA 0.37 U3-, 4-Methylphenol 0.40 U NA 4.0 U 3.6 U NA 0.37 UPhenol 0.40 U NA 4.0 U 3.6 U NA 0.37 U

PAHs (mg/kg)Acenaphthene 0.048 U NA 0.98 J 0.95 J NA 0.044 UAcenaphthylene 0.048 U NA 0.65 J 0.51 J NA 0.044 UAnthracene 0.1 NA 0.75 J 0.52 J NA 0.044 UBenzo(a)anthracene 0.37 NA 4.44 J 0.57 J NA 0.18Benzo(b)fluoranthene 0.17 NA 1.58 J 0.21 J NA 0.11Benzo(k)fluoranthene 0.13 NA 1.63 J 0.16 J NA 0.1Benzo(a)pyrene 0.23 NA 3.31 J 0.54 J NA 0.14Benzo(g,h,i)perylene 0.19 NA 1.81 J 0.24 J NA 0.09Chrysene 0.25 NA 3.09 J 0.38 J NA 0.16Dibenzo(a,h)anthracene 0.13 NA 1.29 J 0.22 J NA 0.07Fluoranthene 0.67 NA 7.03 J 0.83 J NA 0.31Fluorene 0.048 U NA 1.0 J 1.55 J NA 0.044 UIndeno(1,2,3-cd)pyrene 0.25 NA 2.14 J 0.58 J NA 0.11Naphthalene 0.048 U NA 0.64 J 9.30 J NA 0.044 UPhenanthrene 0.36 NA 4.79 J 4.36 J NA 0.12Pyrene 0.42 NA 5.30 J 0.54 J NA 0.23Dibenzofuran 0.40 U NA 4.0 U 3.6 U NA 0.37 U2-Methylnaphthalene 0.40 U NA 4.0 U 19 NA 0.37 U

RCRA Metals and Cyanide (mg/kg)Arsenic 82 J NA 4.7 J 3.4 J NA 11 JBarium 32 J NA 54 J 11 J NA 31 JCadmium 1.7 NA 1.2 U 0.54 U NA 0.68Chromium 5.5 J NA 9.2 J 3.1 J NA 4.3 JLead 8.4 NA 17 5.4 NA 11Mercury 0.17 NA 0.065 0.043 U NA 0.044 USelenium 0.60 UR NA 0.6 UR 0.54 UR NA 0.56 URSilver 2.4 U NA 2.4 U 2.2 U NA 2.2 UCyanide 0.30 U NA 0.58 0.27 U NA 0.28 UNotes:1) J - Estimated value.2) U - Compound/analyte not detected. The associated numerical value is the reporting limit.3) R - The result is unusable. The compound/analyte may or may not be present.4) NA - Not analyzed.


Table D-2 (Continued)Storeroom Facility SI Subsurface Soil Analytical Results

Aurora MGP Site

Sample Location and Depth (feet below ground surface)/ConcentrationSP150-004 SP150-005 SP154-001 SP154-002 SP167-001 SP167-002 SP167-003

Compound/Analyte 10-12 10-14 8-10 12-14 6-8 8-10 12-14BTEX and Styrene (mg/kg)

Benzene 1.9 NA 0.022 UJ 0.35 0.024 UJ NA 0.028 UJEthylbenzene 13 NA 0.09 U 16 0.1 U NA 0.09 UToluene 0.22 NA 0.09 U 0.1 U 0.1 U NA 0.09 UXylenes (total) 36 NA 0.09 U 14 0.1 U NA 0.09 UStyrene 0.09 U NA 0.09 U 0.1 U 0.1 U NA 0.09 U

Phenols (mg/kg)2,4-Dimethylphenol NA 0.78 U NA NA NA 0.40 U 0.36 U2-Methylphenol NA 0.78 U NA NA NA 0.40 U 0.36 U3-, 4-Methylphenol NA 0.78 U NA NA NA 0.40 U 0.36 UPhenol NA 0.78 U NA NA NA 0.40 U 0.36 U

PAHs (mg/kg)Acenaphthene NA 0.047 UJ NA NA NA 0.049 U 0.044 UAcenaphthylene NA 0.047 UJ NA NA NA 0.049 U 0.044 UAnthracene NA 0.27 J NA NA NA 0.049 U 0.044 UBenzo(a)anthracene NA 0.31 J NA NA NA 0.049 U 0.044 UBenzo(b)fluoranthene NA 0.15 J NA NA NA 0.049 U 0.044 UBenzo(k)fluoranthene NA 0.1 J NA NA NA 0.049 U 0.044 UBenzo(a)pyrene NA 0.20 J NA NA NA 0.049 U 0.044 UBenzo(g,h,i)perylene NA 0.18 J NA NA NA 0.049 U 0.044 UChrysene NA 0.22 J NA NA NA 0.049 U 0.044 UDibenzo(a,h)anthracene NA 0.14 J NA NA NA 0.049 U 0.044 UFluoranthene NA 0.58 J NA NA NA 0.049 U 0.044 UFluorene NA 0.77 J NA NA NA 0.049 U 0.044 UIndeno(1,2,3-cd)pyrene NA 0.22 J NA NA NA 0.049 U 0.044 UNaphthalene NA 2.43 J NA NA NA 0.049 U 0.044 UPhenanthrene NA 2.53 J NA NA NA 0.049 U 0.044 UPyrene NA 0.30 J NA NA NA 0.049 U 0.044 UDibenzofuran NA 0.78 U NA NA NA 0.40 U 0.36 U2-Methylnaphthalene NA 5.9 NA NA NA 0.40 U 0.36 U

RCRA Metals and Cyanide (mg/kg)Arsenic NA 6 J NA NA NA 10 J 2.8 JBarium NA 39 J NA NA NA 74 J 20 JCadmium NA 1.1 NA NA NA 1.2 U 0.55 UChromium NA 7 J NA NA NA 17 J 3.4 JLead NA 17 NA NA NA 23 4.4 UMercury NA 0.047 U NA NA NA 0.054 0.044 USelenium NA 0.59 UR NA NA NA 0.61 UR 0.55 URSilver NA 2.4 U NA NA NA 2.4 U 2.2 UCyanide NA 0.3 U NA NA NA 0.3 U 0.28 UNotes:1) J - Estimated value.2) U - Compound/analyte not detected. The associated numerical value is the reporting limit.3) R - The result is unusable. The compound/analyte may or may not be present.4) NA - Not analyzed.


Table D-3Storeroom Facility SI Subsurface Soil Target Compound List (TCL) Analytical Results

Aurora MGP Site

Sample Location and Depth (feet below ground surface)/ConcentrationCompound/Analyte SP145-002 SP145-003 SP146-002 SP146-003 SP147-002


Acetone 2.1 U 1.9 U 2.0 U 1.8 U 2.3 UBenzene 0.02 UJ 0.021 UJ 0.063 J 0.25 0.077 JBromodichloromethane 0.2 U 0.2 U 0.2 U 0.2 U 0.2 UBromoform 0.1 U 0.1 U 0.09 U 0.09 U 0.1 UBromomethane 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U2-Butanone 0.2 U 0.2 U 0.2 U 0.2 U 0.2 UCarbon disulfide 0.2 U 0.2 U 0.2 U 0.2 U 0.2 UCarbon tetrachloride 0.1 U 0.1 U 0.09 U 0.09 U 0.1 UChlorobenzene 0.1 U 0.1 U 0.09 U 0.09 U 0.1 UChloroethane 0.2 U 0.2 U 0.2 U 0.2 U 0.2 UChloroform 0.1 U 0.1 U 0.09 U 0.09 U 0.1 UChloromethane 0.2 U 0.2 U 0.2 U 0.2 U 0.2 UChlorodibromomethane 0.1 U 0.1 U 0.09 U 0.09 U 0.1 U1,1-Dichloroethane 0.1 U 0.1 U 0.09 U 0.09 U 0.1 U1,2-Dichloroethane 0.1 U 0.1 U 0.09 U 0.09 U 0.1 U1,1-Dichloroethene 0.08 U 0.07 U 0.08 U 0.08 U 0.1 Ucis-1,2-Dichloroethene 0.08 U 0.07 U 0.08 U 0.08 U 0.1 Utrans-1,2-Dichloroethene 0.1 U 0.1 U 0.09 U 0.09 U 0.1 U1,2-Dichloropropane 0.1 U 0.1 U 0.09 U 0.09 U 0.1 Ucis-1,3-Dichloropropene 0.1 U 0.1 U 0.09 U 0.09 U 0.1 Utrans-1,3-Dichloropropene 0.1 U 0.1 U 0.09 U 0.09 U 0.1 UEthylbenzene 0.1 U 0.77 0.09 U 2.9 0.1 U2-Hexanone 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U4-Methyl-2-pentanone 0.2 U 0.2 U 0.2 U 0.2 U 0.2 UMethylene chloride 0.1 U 0.1 U 0.09 U 0.09 U 0.1 UStyrene 0.1 U 0.1 U 0.09 U 0.09 U 0.1 U1,1,2,2-Tetrachloroethane 0.1 U 0.1 U 0.09 U 0.09 U 0.1 UTetrachloroethene 0.1 U 0.1 U 0.09 U 0.09 U 0.1 UToluene 0.1 U 0.1 U 0.09 U 0.09 U 0.1 U1,1,1-Trichloroethane 0.1 U 0.1 U 0.09 U 0.09 U 0.1 U1,1,2-Trichloroethane 0.1 U 0.1 U 0.09 U 0.09 U 0.1 UTrichloroethene 0.1 U 0.1 U 0.09 U 0.09 U 0.1 UVinly chloride 0.2 U 0.2 U 0.2 U 0.2 U 0.2 UXylenes (total) 0.1 U 0.95 0.18 4.1 0.1 UNotes:1) J - Estimated value.2) U - Compound/analyte not detected. The associated numerical value is the reporting limit.


Table D-3 (Continued)Storeroom Facility SI Subsurface Soil Target Compound List (TCL) Analytical Results

Aurora MGP Site


8-10 12-15 8-10 12-15 4-8TCL Semivolatiles (mg/kg)

4-Chloro-3-methylphenol NA NA 0.38 U 3.5 U NA2-Chlorophenol NA NA 0.38 U 3.5 U NA2,4-Dichlorophenol NA NA 0.38 U 3.5 U NA2,4-Dimethylphenol 0.39 U 0.35 U 0.38 U 3.5 U NA2,4-Dinitrophenol NA NA 1.8 U 17 U NA2-Methyl-4,6-dinitrophenol NA NA 1.8 U 17 U NA2-Methylphenol 0.39 U 0.35 U 0.38 U 3.5 U NA3-, 4-Methylphenol 0.39 U 0.35 U 0.38 U 3.5 U NA2-Nitrophenol NA NA 0.38 U 3.5 U NA4-Nitrophenol NA NA 1.8 U 17 U NAPentachlorophenol NA NA 1.8 U 17 U NAPhenol 0.39 U 0.35 U 0.38 U 3.5 U NA2,4,5-Trichlorophenol NA NA 0.38 U 3.5 U NA2,4,6-Trichlorophenol NA NA 0.38 U 3.5 U NABenzyl butyl phthalate NA NA 0.38 U 3.5 U NABis(2-chloroethoxy)methane NA NA 0.38 U 3.5 U NABis(2-chloroethyl)ether NA NA 0.38 U 3.5 U NABis(2-chloroisopropyl)ether NA NA 0.38 U 3.5 U NABis(2-ethylhexyl)phthalate NA NA 0.38 U 3.5 U NA4-Bromophenyl phenyl ether NA NA 0.38 U 3.5 U NACarbazole NA NA 0.38 U 3.5 U NA4-Chloroaniline NA NA 0.38 U 3.5 U NA2-Chloronaphthalene NA NA 0.38 U 3.5 U NA4-Chlorophenyl phenyl ether NA NA 0.38 U 3.5 U NADibenzofuran 0.39 U 0.35 U 0.38 U 3.5 U NADi-n-butyl phthalate NA NA 0.38 U 3.5 U NA1,2-Dichlorobenzene NA NA 0.38 U 3.5 U NA1,3-Dichlorobenzene NA NA 0.38 U 3.5 U NA1,4-Dichlorobenzene NA NA 0.38 U 3.5 U NA3,3-Dichlorobenzidine NA NA 0.76 U 7.1 U NADiethyl phthalate NA NA 0.38 U 3.5 U NADimethyl phthalate NA NA 0.38 U 3.5 U NA2,4-Dinitrotoluene NA NA 0.38 U 3.5 U NA2,6-Dinitrotoluene NA NA 0.38 U 3.5 U NADi-n-octyl phthalate NA NA 0.38 U 3.5 U NAHexachlorobenzene NA NA 0.38 U 3.5 U NANotes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) NA - Not analyzed.



Aurora MGP Site


8-10 12-15 8-10 12-15 4-8TCL Semivolatiles (Continued) (mg/kg)

Hexachlorobutadiene NA NA 0.38 U 3.5 U NAHexachlorocyclopentadiene NA NA 0.38 U 3.5 U NAHexachloroethane NA NA 0.38 U 3.5 U NAIsophorone NA NA 0.38 U 3.5 U NA2-Methylnaphthalene 0.39 U 5.8 1.4 18 NA2-Nitroaniline NA NA 1.8 U 17 U NA3-Nitroaniline NA NA 1.8 U 17 U NA4-Nitroaniline NA NA 1.8 U 17 U NANitrobenzene NA NA 0.38 U 3.5 U NAN-nitrosodimethylamine NA NA 0.38 U 3.5 U NAN-nitrosodi-n-propylamine NA NA 0.38 U 3.5 U NAN-nitrosodiphenylamine NA NA 0.38 U 3.5 U NA1,2,4-Trichlorobenzene NA NA 0.38 U 3.5 U NAAcenaphthene 0.07 0.22 0.20 1.31 NAAcenaphthylene 0.057 U 0.07 0.16 0.46 NAAnthracene 0.29 0.22 0.30 0.95 NABenzo(a)anthracene 0.61 0.28 0.83 0.56 NABenzo(b)fluoranthene 0.35 0.13 0.36 0.17 NABenzo(k)fluoranthene 0.36 0.14 0.31 0.15 NABenzo(a)pyrene 0.51 0.20 0.63 0.28 NABenzo(g,h,i)perylene 0.36 0.12 0.41 0.12 NAChrysene 0.63 0.27 0.60 0.40 NADibenzo(a,h)anthracene 0.19 0.07 0.25 0.9 U NAFluoranthene 1.48 0.55 1.25 0.92 NAFluorene 0.06 0.35 0.28 2.08 NAIndeno(1,2,3-cd)pyrene 0.36 0.13 0.51 0.16 NANaphthalene 0.08 1.12 0.18 10.5 NAPhenanthrene 0.93 1.34 1.26 6.55 NAPyrene 1.2 0.39 0.94 1.12 NANotes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) NA - Not analyzed.



Aurora MGP Site



Acetone NA 2.0 U 1.9 U NA 1.8 UBenzene NA 0.032 UJ 0.079 J NA 0.67Bromodichloromethane NA 0.2 U 0.2 U NA 0.2 UBromoform NA 0.1 U 0.1 U NA 0.09 UBromomethane NA 0.2 U 0.2 U NA 0.2 U2-Butanone NA 0.2 U 0.2 U NA 0.2 UCarbon disulfide NA 0.2 U 0.2 U NA 0.2 UCarbon tetrachloride NA 0.1 U 0.1 U NA 0.09 UChlorobenzene NA 0.1 U 0.1 U NA 0.09 UChloroethane NA 0.2 U 0.2 U NA 0.2 UChloroform NA 0.1 U 0.1 U NA 0.09 UChloromethane NA 0.2 U 0.2 U NA 0.2 UChlorodibromomethane NA 0.1 U 0.1 U NA 0.09 U1,1-Dichloroethane NA 0.1 U 0.1 U NA 0.09 U1,2-Dichloroethane NA 0.1 U 0.1 U NA 0.09 U1,1-Dichloroethene NA 0.08 U 0.07 U NA 0.08 Ucis-1,2-Dichloroethene NA 0.08 U 0.07 U NA 0.08 Utrans-1,2-Dichloroethene NA 0.1 U 0.1 U NA 0.09 U1,2-Dichloropropane NA 0.1 U 0.1 U NA 0.09 Ucis-1,3-Dichloropropene NA 0.1 U 0.1 U NA 0.09 Utrans-1,3-Dichloropropene NA 0.1 U 0.1 U NA 0.09 UEthylbenzene NA 0.1 U 0.1 U NA 182-Hexanone NA 0.2 U 0.2 U NA 0.2 U4-Methyl-2-pentanone NA 0.2 U 0.2 U NA 0.2 UMethylene chloride NA 0.1 U 0.1 U NA 0.09 UStyrene NA 0.1 U 0.1 U NA 0.09 U1,1,2,2-Tetrachloroethane NA 0.1 U 0.1 U NA 0.09 UTetrachloroethene NA 0.1 U 0.1 U NA 0.09 UToluene NA 0.1 U 0.1 U NA 0.131,1,1-Trichloroethane NA 0.1 U 0.1 U NA 0.09 U1,1,2-Trichloroethane NA 0.1 U 0.1 U NA 0.09 UTrichloroethene NA 0.1 U 0.1 U NA 0.09 UVinly chloride NA 0.2 U 0.2 U NA 0.2 UXylenes (total) NA 0.1 U 0.17 NA 22Notes:1) J - Estimated value.2) U - Compound/analyte not detected. The associated numerical value is the reporting limit.3) NA - Not analyzed.



Aurora MGP Site



4-Chloro-3-methylphenol 0.40 U 0.40 U NA 4 U 3.6 U2-Chlorophenol 0.40 U 0.40 U NA 4 U 3.6 U2,4-Dichlorophenol 0.40 U 0.40 U NA 4 U 3.6 U2,4-Dimethylphenol 0.40 U 0.40 U NA 4 U 3.6 U2,4-Dinitrophenol 2 U 1.9 U NA 19 U 17 U2-Methyl-4,6-dinitrophenol 2 U 1.9 U NA 19 U 17 U2-Methylphenol 0.40 U 0.40 U NA 4 U 3.6 U3-, 4-Methylphenol 0.40 U 0.40 U NA 4 U 3.6 U2-Nitrophenol 0.40 U 0.40 U NA 4 U 3.6 U4-Nitrophenol 2 U 1.9 U NA 19 U 17 UPentachlorophenol 2 U 1.9 U NA 19 U 17 UPhenol 0.40 U 0.40 U NA 4 U 3.6 U2,4,5-Trichlorophenol 0.40 U 0.40 U NA 4 U 3.6 U2,4,6-Trichlorophenol 0.40 U 0.40 U NA 4 U 3.6 UBenzyl butyl phthalate 0.40 U 0.40 U NA 4 U 3.6 UBis(2-chloroethoxy)methane 0.40 U 0.40 U NA 4 U 3.6 UBis(2-chloroethyl)ether 0.40 U 0.40 U NA 4 U 3.6 UBis(2-chloroisopropyl)ether 0.40 U 0.40 U NA 4 U 3.6 UBis(2-ethylhexyl)phthalate 0.40 U 0.40 U NA 4 U 3.6 U4-Bromophenyl phenyl ether 0.40 U 0.40 U NA 4 U 3.6 UCarbazole 0.40 U 0.40 U NA 4 U 3.6 U4-Chloroaniline 0.40 U 0.40 U NA 4 U 3.6 U2-Chloronaphthalene 0.40 U 0.40 U NA 4 U 3.6 U4-Chlorophenyl phenyl ether 0.40 U 0.40 U NA 4 U 3.6 UDibenzofuran 0.40 U 0.40 U NA 4 U 3.6 UDi-n-butyl phthalate 0.40 U 0.40 U NA 4 U 3.6 U1,2-Dichlorobenzene 0.40 U 0.40 U NA 4 U 3.6 U1,3-Dichlorobenzene 0.40 U 0.40 U NA 4 U 3.6 U1,4-Dichlorobenzene 0.40 U 0.40 U NA 4 U 3.6 U3,3-Dichlorobenzidine 0.40 U 0.79 U NA 4 U 7.1 UDiethyl phthalate 0.40 U 0.40 U NA 4 U 3.6 UDimethyl phthalate 0.40 U 0.40 U NA 4 U 3.6 U2,4-Dinitrotoluene 0.40 U 0.40 U NA 4 U 3.6 U2,6-Dinitrotoluene 0.40 U 0.40 U NA 4 U 3.6 UDi-n-octyl phthalate 0.40 U 0.40 U NA 4 U 3.6 UHexachlorobenzene 0.40 U 0.40 U NA 4 U 3.6 UNotes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) NA - Not analyzed.



Aurora MGP Site



Hexachlorobutadiene 0.40 U 0.4 U NA 4 U 3.6 UHexachlorocyclopentadiene 0.40 U 0.4 U NA 4 U 3.6 UHexachloroethane 0.40 U 0.4 U NA 4 U 3.6 UIsophorone 0.40 U 0.4 U NA 4 U 3.6 U2-Methylnaphthalene 0.40 U 0.4 U NA 4 U 192-Nitroaniline 2 U 1.9 U NA 19 U 17 U3-Nitroaniline 2 U 1.9 U NA 19 U 17 U4-Nitroaniline 2 U 1.9 U NA 19 U 17 UNitrobenzene 0.40 U 0.4 U NA 4 U 3.6 UN-nitrosodimethylamine 0.40 U 0.4 U NA 4 U 3.6 UN-nitrosodi-n-propylamine 0.40 U 0.4 U NA 4 U 3.6 UN-nitrosodiphenylamine 0.40 U 0.4 U NA 4 U 3.6 U1,2,4-Trichlorobenzene 0.40 U 0.4 U NA 4 U 3.6 UAcenaphthene 0.049 U 0.048 U NA 0.98 J 0.95 JAcenaphthylene 0.049 U 0.048 U NA 0.65 J 0.51 JAnthracene 0.049 U 0.10 NA 0.75 J 0.52 JBenzo(a)anthracene 0.049 U 0.37 NA 4.44 J 0.57 JBenzo(b)fluoranthene 0.049 U 0.17 NA 1.58 J 0.21 JBenzo(k)fluoranthene 0.049 U 0.13 NA 1.63 J 0.16 JBenzo(a)pyrene 0.049 U 0.23 NA 3.31 J 0.54 JBenzo(g,h,i)perylene 0.049 U 0.19 NA 1.81 J 0.24 JChrysene 0.049 U 0.25 NA 3.09 J 0.38 JDibenzo(a,h)anthracene 0.049 U 0.13 NA 1.29 J 0.22 JFluoranthene 0.049 U 0.67 NA 7.03 J 0.83 JFluorene 0.049 U 0.048 U NA 1 J 1.55 JIndeno(1,2,3-cd)pyrene 0.049 U 0.25 NA 2.14 J 0.58 JNaphthalene 0.049 U 0.048 U NA 0.64 J 9.3 JPhenanthrene 0.049 U 0.36 NA 4.79 J 4.36 JPyrene 0.049 U 0.42 NA 5.3 J 0.54 JNotes:1) J - Estimated value.2) U - Compound/analyte not detected. The associated numerical value is the reporting limit.3) NA - Not analyzed.



Aurora MGP Site



Acetone 2 U NA 1.9 U NA 1.7 UBenzene 0.032 UJ NA 1.9 NA 0.022 UJBromodichloromethane 0.2 U NA 0.2 U NA 0.2 UBromoform 0.1 U NA 0.09 U NA 0.09 UBromomethane 0.2 U NA 0.2 U NA 0.2 U2-Butanone 0.2 U NA 0.2 U NA 0.2 UCarbon disulfide 0.2 U NA 0.2 U NA 0.2 UCarbon tetrachloride 0.1 U NA 0.09 U NA 0.09 UChlorobenzene 0.1 U NA 0.09 U NA 0.09 UChloroethane 0.2 U NA 0.2 U NA 0.2 UChloroform 0.1 U NA 0.09 U NA 0.09 UChloromethane 0.2 U NA 0.2 U NA 0.2 UChlorodibromomethane 0.1 U NA 0.09 U NA 0.09 U1,1-Dichloroethane 0.1 U NA 0.09 U NA 0.09 U1,2-Dichloroethane 0.1 U NA 0.09 U NA 0.09 U1,1-Dichloroethene 0.08 U NA 0.07 U NA 0.06 Ucis-1,2-Dichloroethene 0.08 U NA 0.07 U NA 0.06 Utrans-1,2-Dichloroethene 0.1 U NA 0.09 U NA 0.09 U1,2-Dichloropropane 0.1 U NA 0.09 U NA 0.09 Ucis-1,3-Dichloropropene 0.1 U NA 0.09 U NA 0.09 Utrans-1,3-Dichloropropene 0.1 U NA 0.09 U NA 0.09 UEthylbenzene 0.1 U NA 13 NA 0.09 U2-Hexanone 0.2 U NA 0.2 U NA 0.2 U4-Methyl-2-pentanone 0.2 U NA 0.2 U NA 0.2 UMethylene chloride 0.1 U NA 0.09 U NA 0.09 UStyrene 0.1 U NA 0.09 U NA 0.09 U1,1,2,2-Tetrachloroethane 0.1 U NA 0.09 U NA 0.09 UTetrachloroethene 0.1 U NA 0.09 U NA 0.09 UToluene 0.1 U NA 0.22 NA 0.09 U1,1,1-Trichloroethane 0.1 U NA 0.09 U NA 0.09 U1,1,2-Trichloroethane 0.1 U NA 0.09 U NA 0.09 UTrichloroethene 0.1 U NA 0.09 U NA 0.09 UVinly chloride 0.2 U NA 0.2 U NA 0.2 UXylenes (total) 0.1 U NA 36 NA 0.09 UNotes:1) J - Estimated value.2) U - Compound/analyte not detected. The associated numerical value is the reporting limit.3) NA - Not analyzed.



Aurora MGP Site



4-Chloro-3-methylphenol NA 0.37 U NA 0.78 U NA2-Chlorophenol NA 0.37 U NA 0.78 U NA2,4-Dichlorophenol NA 0.37 U NA 0.78 U NA2,4-Dimethylphenol NA 0.37 U NA 0.78 U NA2,4-Dinitrophenol NA 1.8 U NA 3.8 U NA2-Methyl-4,6-dinitrophenol NA 1.8 U NA 3.8 U NA2-Methylphenol NA 0.37 U NA 0.78 U NA3-, 4-Methylphenol NA 0.37 U NA 0.78 U NA2-Nitrophenol NA 0.37 U NA 0.78 U NA4-Nitrophenol NA 1.8 U NA 3.8 U NAPentachlorophenol NA 1.8 U NA 3.8 U NAPhenol NA 0.37 U NA 0.78 U NA2,4,5-Trichlorophenol NA 0.37 U NA 0.78 U NA2,4,6-Trichlorophenol NA 0.37 U NA 0.78 U NABenzyl butyl phthalate NA 0.37 U NA 0.78 U NABis(2-chloroethoxy)methane NA 0.37 U NA 0.78 U NABis(2-chloroethyl)ether NA 0.37 U NA 0.78 U NABis(2-chloroisopropyl)ether NA 0.37 U NA 0.78 U NABis(2-ethylhexyl)phthalate NA 0.37 U NA 0.78 U NA4-Bromophenyl phenyl ether NA 0.37 U NA 0.78 U NACarbazole NA 0.37 U NA 0.78 U NA4-Chloroaniline NA 0.37 U NA 0.78 U NA2-Chloronaphthalene NA 0.37 U NA 0.78 U NA4-Chlorophenyl phenyl ether NA 0.37 U NA 0.78 U NADibenzofuran NA 0.37 U NA 0.78 U NADi-n-butyl phthalate NA 0.37 U NA 0.78 U NA1,2-Dichlorobenzene NA 0.37 U NA 0.78 U NA1,3-Dichlorobenzene NA 0.37 U NA 0.78 U NA1,4-Dichlorobenzene NA 0.37 U NA 0.78 U NA3,3-Dichlorobenzidine NA 0.37 U NA 1.5 U NADiethyl phthalate NA 0.37 U NA 0.78 U NADimethyl phthalate NA 0.37 U NA 0.78 U NA2,4-Dinitrotoluene NA 0.37 U NA 0.78 U NA2,6-Dinitrotoluene NA 0.37 U NA 0.78 U NADi-n-octyl phthalate NA 0.37 U NA 0.78 U NAHexachlorobenzene NA 0.37 U NA 0.78 U NANotes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) NA - Not analyzed.



Aurora MGP Site



Hexachlorobutadiene NA 0.37 U NA 0.78 U NAHexachlorocyclopentadiene NA 0.37 U NA 0.78 U NAHexachloroethane NA 0.37 U NA 0.78 U NAIsophorone NA 0.37 U NA 0.78 U NA2-Methylnaphthalene NA 0.37 U NA 5.9 NA2-Nitroaniline NA 1.8 U NA 3.8 U NA3-Nitroaniline NA 1.8 U NA 3.8 U NA4-Nitroaniline NA 1.8 U NA 3.8 U NANitrobenzene NA 0.37 U NA 0.78 U NAN-nitrosodimethylamine NA 0.37 U NA 0.78 U NAN-nitrosodi-n-propylamine NA 0.37 U NA 0.78 U NAN-nitrosodiphenylamine NA 0.37 U NA 0.78 U NA1,2,4-Trichlorobenzene NA 0.37 U NA 0.78 U NAAcenaphthene NA 0.044 U NA 0.047 UJ NAAcenaphthylene NA 0.044 U NA 0.047 UJ NAAnthracene NA 0.044 U NA 0.27 J NABenzo(a)anthracene NA 0.18 NA 0.31 J NABenzo(b)fluoranthene NA 0.11 NA 0.15 J NABenzo(k)fluoranthene NA 0.1 NA 0.1 J NABenzo(a)pyrene NA 0.14 NA 0.2 J NABenzo(g,h,i)perylene NA 0.09 NA 0.18 J NAChrysene NA 0.16 NA 0.22 J NADibenzo(a,h)anthracene NA 0.07 NA 0.14 J NAFluoranthene NA 0.31 NA 0.58 J NAFluorene NA 0.044 U NA 0.77 J NAIndeno(1,2,3-cd)pyrene NA 0.11 NA 0.22 J NANaphthalene NA 0.044 U NA 2.43 J NAPhenanthrene NA 0.12 NA 2.53 J NAPyrene NA 0.23 NA 0.3 J NANotes:1) J - Estimated value.2) U - Compound/analyte not detected. The associated numerical value is the reporting limit.3) NA - Not analyzed.


Compound/Analyte SP154-002 SP167-001 SP167-002 SP167-00312-14 6-8 8-10 12-14

Acetone 1.9 U 2.4 U NA 1.8 UBenzene 0.35 0.024 UJ NA 0.028 UJBromodichloromethane 0.2 U 0.2 U NA 0.20 UBromoform 0.1 U 0.1 U NA 0.09 UBromomethane 0.2 U 0.2 U NA 0.2 U2-Butanone 0.2 U 0.2 U NA 0.2 UCarbon disulfide 0.2 U 0.2 U NA 0.2 UCarbon tetrachloride 0.1 U 0.1 U NA 0.09 UChlorobenzene 0.1 U 0.1 U NA 0.09 UChloroethane 0.2 U 0.2 U NA 0.2 UChloroform 0.1 U 0.1 U NA 0.09 UChloromethane 0.2 U 0.2 U NA 0.2 UChlorodibromomethane 0.1 U 0.1 U NA 0.09 U1,1-Dichloroethane 0.1 U 0.1 U NA 0.09 U1,2-Dichloroethane 0.1 U 0.1 U NA 0.09 U1,1-Dichloroethene 0.08 U 0.1 U NA 0.07 Ucis-1,2-Dichloroethene 0.08 U 0.1 U NA 0.07 Utrans-1,2-Dichloroethene 0.1 U 0.1 U NA 0.09 U1,2-Dichloropropane 0.1 U 0.1 U NA 0.09 Ucis-1,3-Dichloropropene 0.1 U 0.1 U NA 0.09 Utrans-1,3-Dichloropropene 0.1 U 0.1 U NA 0.09 UEthylbenzene 16 0.1 U NA 0.09 U2-Hexanone 0.2 U 0.2 U NA 0.2 U4-Methyl-2-pentanone 0.2 U 0.2 U NA 0.2 UMethlene chloride 0.1 U 0.1 U NA 0.09 UStyrene 0.1 U 0.1 U NA 0.09 U1,1,2,2-Tetrachloroethane 0.1 U 0.1 U NA 0.09 UTetrachloroethene 0.1 U 0.1 U NA 0.09 UToluene 0.1 U 0.1 U NA 0.09 U1,1,1-Trichloroethane 0.1 U 0.1 U NA 0.09 U1,1,2-Trichloroethane 0.1 U 0.1 U NA 0.09 UTrichloroethene 0.1 U 0.1 U NA 0.09 UVinly chloride 0.2 U 0.2 U NA 0.2 UXylenes (total) 14 0.1 U NA 0.09 UNotes:1) J - Estimated value.2) U - Compound/analyte not detected. The associated numerical value is the reporting limit.3) NA - Not analyzed.

TCL Volatiles (mg/kg)


Aurora MGP Site

Sample Location and Depth (feet below ground surface)/Concentration



4-Chloro-3-methylphenol NA NA 0.40 U 0.36 U2-Chlorophenol NA NA 0.40 U 0.36 U2,4-Dichlorophenol NA NA 0.40 U 0.36 U2,4-Dimethylphenol NA NA 0.40 U 0.36 U2,4-Dinitrophenol NA NA 1.9 U 1.8 U2-Methyl-4,6-dinitrophenol NA NA 1.9 U 1.8 U2-Methylphenol (O-cresol) NA NA 0.40 U 0.36 U4-Methylphenol (P-cresol) NA NA 0.40 U 0.36 U2-Nitrophenol NA NA 0.40 U 0.36 U4-Nitrophenol NA NA 1.9 U 1.8 UPentachlorophenol NA NA 1.9 U 1.8 UPhenol NA NA 0.40 U 0.36 U2,4,5-Trichlorophenol NA NA 0.40 U 0.36 U2,4,6-Trichlorophenol NA NA 0.40 U 0.36 UBenzyl butyl phthalate NA NA 0.40 U 0.36 UBis(2-chloroethoxy)methane NA NA 0.40 U 0.36 UBis(2-chloroethyl)ether NA NA 0.40 U 0.36 UBis(2-chloroisopropyl)ether NA NA 0.40 U 0.36 UBis(2-ethylhexyl)phthalate NA NA 0.40 U 0.36 U4-Bromophenyl phenyl ether NA NA 0.40 U 0.36 UCarbazole NA NA 0.40 U 0.36 U4-Chloroaniline NA NA 0.40 U 0.36 U2-Chloronaphthalene NA NA 0.40 U 0.36 U4-Chlorophenyl phenyl ether NA NA 0.40 U 0.36 UDibenzofuran NA NA 0.40 U 0.36 UDi-n-butyl phthalate NA NA 0.40 U 0.36 U1,2-Dichlorobenzene NA NA 0.40 U 0.36 U1,3-Dichlorobenzene NA NA 0.40 U 0.36 U1,4-Dichlorobenzene NA NA 0.40 U 0.36 U3,3-Dichlorobenzidine NA NA 0.40 U 0.73 UDiethyl phthalate NA NA 0.40 U 0.36 UDimethyl phthalate NA NA 0.40 U 0.36 U2,4-Dinitrotoluene NA NA 0.40 U 0.36 U2,6-Dinitrotoluene NA NA 0.40 U 0.36 UDi-n-octyl phthalate NA NA 0.40 U 0.36 UHexachlorobenzene NA NA 0.40 U 0.36 UNotes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) NA - Not analyzed.


Aurora MGP Site


TCL Semivolatiles (mg/kg)



Hexachlorobutadiene NA NA 0.40 U 0.36 UHexachlorocyclopentadiene NA NA 0.40 U 0.36 UHexachloroethane NA NA 0.40 U 0.36 UIsophorone NA NA 0.40 U 0.36 U2-Methylnaphthalene NA NA 0.40 U 0.36 U2-Nitroaniline NA NA 1.9 U 1.8 U3-Nitroaniline NA NA 1.9 U 1.8 U4-Nitroaniline NA NA 1.9 U 1.8 UNitrobenzene NA NA 0.40 U 0.36 UN-nitrosodimethylamine NA NA 0.40 U 0.36 UN-nitrosodi-n-propylamine NA NA 0.40 U 0.36 UN-nitrosodiphenylamine NA NA 0.40 U 0.36 U1,2,4-Trichlorobenzene NA NA 0.40 U 0.36 UAcenaphthene NA NA 0.049 U 0.044 UAcenaphthylene NA NA 0.049 U 0.044 UAnthracene NA NA 0.049 U 0.044 UBenzo(a)anthracene NA NA 0.049 U 0.044 UBenzo(b)fluoranthene NA NA 0.049 U 0.044 UBenzo(k)fluoranthene NA NA 0.049 U 0.044 UBenzo(a)pyrene NA NA 0.049 U 0.044 UBenzo(g,h,i)perylene NA NA 0.049 U 0.044 UChrysene NA NA 0.049 U 0.044 UDibenzo(a,h)anthracene NA NA 0.049 U 0.044 UFluoranthene NA NA 0.049 U 0.044 UFluorene NA NA 0.049 U 0.044 UIndeno(1,2,3-cd)pyrene NA NA 0.049 U 0.044 UNaphthalene NA NA 0.049 U 0.044 UPhenanthrene NA NA 0.049 U 0.044 UPyrene NA NA 0.049 U 0.044 UNotes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) NA - Not analyzed.

TCL Semivolatiles (Continued) (mg/kg)



Aurora MGP Site


Table D-4Storeroom Facility SI Subsurface Soil Physical Results

Aurora MGP Site

Sample Location and Depth (feet below ground surface)SP147-301 SP147-302

Analysis 4-8 8-12Moisture Content (%) 28.37 9.88pH, Non-Aqueous 7.49 7.86Organic Matter (Geotechnical), % 7.11 0.43


APPENDIX E STRUCTURE AREA ANALYTICAL RESULTS TABLES

AND INVESTIGATION ACTIVITIES MAP SUPPLEMENTAL SITE INVESTIGATION

AURORA MGP SITE

Table E-1Structure Area Analytical Results

Aurora MGP Site


(SB07-001)1 (SB07-002)1 (SB07-003)1 (SB08-001)1 (SB08-002)1 (SB08-003)1


Benzene 0.25 U 110 NA 0.25 U 0.25 U NAEthylbenzene 0.25 U 19 NA 0.25 U 0.25 U NAToluene 0.25 U 150 NA 0.25 U 0.25 U NAXylenes (total) 0.25 U 110 NA 0.25 U 0.25 U NAStyrene 0.25 U 120 NA 0.25 U 0.25 U NA

Phenols (mg/kg)2,4-Dimethylphenol 13 UJ 200 UJ NA 0.66 U 3.3 UJ 4.6 U2-Methylphenol 13 UJ 200 UJ NA 0.66 U 3.3 UJ 4.6 U3-, 4-Methylphenol 13 UJ 200 UJ NA 0.66 U 3.3 UJ 4.6 UPhenol 13 UJ 200 UJ NA 0.66 U 3.3 UJ 4.6 U

PAHs (mg/kg)Acenaphthene 83.0 J 317 J 92 J 1.20 UJ 4.2 J 22Acenaphthylene 169 J 943 J 92 J 1.54 UJ 2.6 J 77.4Anthracene 46 J 94 J 664 J 0.440 UJ 10.3 J 140Benzo(a)anthracene 43 J 91 J 58 J 0.948 J 11.2 J 54.9Benzo(b)fluoranthene 9.5 J 20 J 8.8 J 0.836 J 7.7 J 20.8Benzo(k)fluoranthene 6.7 J 14 J 6.0 J 0.542 J 5.6 J 16.6Benzo(a)pyrene 27 J 63 J 25 J 0.997 J 9.7 J 38.3Benzo(g,h,i)perylene 16 J 42 J 14 J 0.690 J 5.3 J 13.9Chrysene 24 J 51 J 25 J 0.838 J 10.7 J 38.3Dibenzo(a,h)anthracene 0.610 J 2.0 J 10 J 0.122 J 1.1 J 3.1Fluoranthene 84 J 307 J 152 J 1.9 J 33.2 J 162Fluorene 107 J 449 J 234 J 0.140 UJ 5.9 J 88.5Indeno(1,2,3-cd)pyrene 11 J 26 J 13 J 0.641 J 4.9 J 13.1Naphthalene 243 J 1640 J 860 J 1.20 UJ 7.6 J 649Phenanthrene 166 J 409 J 235 J 1.1 J 27.3 J 316Pyrene 70 J 185 J 72 J 1.8 J 28.4 J 152Dibenzofuran 15 J 200 UJ 66 UJ 0.66 U 3.3 UJ 712-Methylnaphthalene 77 J 800 J 260 J 0.66 U 3.3 UJ 19

RCRA Metals and Cyanide (mg/kg)Arsenic 24 32 NA 52 4.7 NABarium 92 87 NA 143 78 NACadmium 4.1 3.7 NA 0.40 U 0.4 U NAChromium 26 27 NA 0.7 U 0.7 U NALead 49 92 NA 29 1100 NAMercury 0.16 0.14 NA 3.8 0.51 NASelenium 7.5 U 7.5 U NA 7.5 U 7.5 U NASilver 1.0 U 1.0 U NA 1.0 U 1 U NACyanide 1.4 7.1 NA 0.50 1.4 NANotes:1) Soil sample collected during the 1995-1996 site investigation.2) J - Estimated value.3) U - Compound/analyte not detected. The associated numerical value is the reporting limit.4) NA - Not analyzed.


Table E-1 (Continued)Structure Area Analytical Results

Aurora MGP Site


(SB09-001)1 (SB09-002)1 (SB09-003)1 (SB09-004)1 SB41-001 SB41-002Compound/Analyte 0-2 4-6 10-12 16-17 0.2-2.2 2-4

BTEX and Styrene (mg/kg)Benzene 0.25 U 21 NA 73 0.005 U 0.006 UEthylbenzene 0.25 U 6.6 NA 67 0.005 U 0.006 UToluene 0.25 U 0.68 NA 25 0.018 0.006 UXylenes (total) 0.25 U 7.3 NA 54 0.022 0.006 UStyrene 0.25 U 0.25 U NA 0.4 U NA NA

Phenols (mg/kg)2,4-Dimethylphenol 6.6 UJ 130 UJ NA 66 UJ NA NA2-Methylphenol 6.6 UJ 130 UJ NA 66 UJ NA NA3-, 4-Methylphenol 6.6 UJ 130 UJ NA 66 UJ NA NAPhenol 6.6 UJ 130 UJ NA 66 UJ NA NA

PAHs (mg/kg)Acenaphthene 6.6 UJ 215 J 285 190 J NA NAAcenaphthylene 26 J 376 J 260 260 J NA NAAnthracene 3.7 J 345 J 330 159 J NA NABenzo(a)anthracene 2.9 J 260 J 170 84 J NA NABenzo(b)fluoranthene 7 J 170 J 130 53 J NA NABenzo(k)fluoranthene 6.3 J 160 J 85 44 J NA NABenzo(a)pyrene 4.6 J 780 J 177 81 J NA NABenzo(g,h,i)perylene 5.3 J 170 J 36 42 J NA NAChrysene 3.4 J 270 J 180 78 J NA NADibenzo(a,h)anthracene 2.3 J 58 J 165 U 16 J NA NAFluoranthene 3 J 630 J 420 200 J NA NAFluorene 1.1 J 570 J 350 179 J NA NAIndeno(1,2,3-cd)pyrene 5.2 J 170 J 165 U 43 J NA NANaphthalene 1.9 J 8200 J 3200 1800 J NA NAPhenanthrene 2 J 1500 J 956 505 J NA NAPyrene 5.1 J 812 J 165 U 66 UJ NA NADibenzofuran 6.6 UJ 130 UJ 67 66 UJ NA NA2-Methylnaphthalene 6.6 UJ 900 J 1110 650 J NA NA

RCRA Metals and Cyanide (mg/kg)Arsenic 18 61 NA 7 NA NABarium 78 21 NA 33 NA NACadmium 0.4 U 0.4 U NA 0.4 U NA NAChromium 0.7 U 83 NA 0.7 U NA NALead 109 255 NA 93 NA NAMercury 4.1 0.02 U NA 0.09 NA NASelenium 7.5 U 7.5 NA 7.5 U NA NASilver 1 U 1 U NA 1 U NA NACyanide 8.2 3.7 NA 100 NA NANotes:1) Soil sample collected during the 1995-1996 site investigation.2) J - Estimated value.3) U - Compound/analyte not detected. The associated numerical value is the reporting limit.4) NA - Not analyzed.



Aurora MGP Site



Benzene 0.013 0.417 1.11 0.618 63.2 304Ethylbenzene 0.051 0.096 0.056 0.058 17.6 56Toluene 0.081 1.12 1.59 1.1 91.5 348Xylenes (total) 0.127 0.355 0.244 0.246 69.8 305Styrene NA NA NA NA NA NA

Phenols (mg/kg)2,4-Dimethylphenol NA NA NA NA NA NA2-Methylphenol NA NA NA NA NA NA3-, 4-Methylphenol NA NA NA NA NA NAPhenol NA NA NA NA NA NA

PAHs (mg/kg)Acenaphthene NA NA NA NA NA NAAcenaphthylene NA NA NA NA NA NAAnthracene NA NA NA NA NA NABenzo(a)anthracene NA NA NA NA NA NABenzo(b)fluoranthene NA NA NA NA NA NABenzo(k)fluoranthene NA NA NA NA NA NABenzo(a)pyrene NA NA NA NA NA NABenzo(g,h,i)perylene NA NA NA NA NA NAChrysene NA NA NA NA NA NADibenzo(a,h)anthracene NA NA NA NA NA NAFluoranthene NA NA NA NA NA NAFluorene NA NA NA NA NA NAIndeno(1,2,3-cd)pyrene NA NA NA NA NA NANaphthalene NA NA NA NA NA NAPhenanthrene NA NA NA NA NA NAPyrene NA NA NA NA NA NADibenzofuran NA NA NA NA NA NA2-Methylnaphthalene NA NA NA NA NA NA

RCRA Metals and Cyanide (mg/kg)Arsenic NA NA NA NA NA NABarium NA NA NA NA NA NACadmium NA NA NA NA NA NAChromium NA NA NA NA NA NALead NA NA NA NA NA NAMercury NA NA NA NA NA NASelenium NA NA NA NA NA NASilver NA NA NA NA NA NACyanide NA NA NA NA NA NANote:1) NA - Not analyzed.



Aurora MGP Site


Compound/Analyte 0.2-2.2 2-4 4-6 6-8 8-10 10-12BTEX and Styrene (mg/kg)

Benzene 0.005 U 16 65.8 18.7 3 3.02Ethylbenzene 0.005 U 38.8 79.2 18.3 0.615 0.472Toluene 0.005 U 34.8 79.2 75.4 4.23 3.85Xylenes (total) 0.005 U 52.9 171 92.2 3.19 2.42Styrene NA NA NA NA NA NA



RCRA Metals and Cyanide (mg/kg)Arsenic NA NA NA NA NA NABarium NA NA NA NA NA NACadmium NA NA NA NA NA NAChromium NA NA NA NA NA NALead NA NA NA NA NA NAMercury NA NA NA NA NA NASelenium NA NA NA NA NA NASilver NA NA NA NA NA NACyanide NA NA NA NA NA NANotes:1) U - Compound/analyte not detected. The associated numerical value is the reporting limit.2) NA - Not analyzed.



Aurora MGP Site


Compound/Analyte 12-14 14-14.9 0.2-2.2 2.2-3 3-5 5-7BTEX and Styrene (mg/kg)

Benzene 21.9 31.2 0.006 U 0.028 22 U 9.13Ethylbenzene 6.93 12.6 0.006 U 0.006 U 22 U 16.2Toluene 35.2 53.8 0.006 U 0.014 22 U 6.12Xylenes (total) 33.1 51.3 0.006 U 0.0083 34 U 16.6Styrene NA NA NA NA NA NA






Aurora MGP Site


Compound/Analyte 7-9 0.3-2.3 4-6 6-8 9.5-11.5 11.5-13BTEX and Styrene (mg/kg)

Benzene 134 0.005 U 100 56 331 120Ethylbenzene 172 0.005 U 53 16 33 67Toluene 99.1 0.005 U 1.8 U 0.71 U 21 10Xylenes (total) 199 0.005 U 27 8.9 240 97Styrene NA NA NA NA NA NA






Aurora MGP Site


Compound/Analyte 0.3-2.3 2.3-4.3 4.3-6.3 6.3-8.3 8.3-10.3 10.3-12.3BTEX and Styrene (mg/kg)

Benzene 0.009 U 0.008 U 0.052 J 0.13 0.067 J 0.97Ethylbenzene 0.009 U 0.008 U 0.18 1.4 2.2 3Toluene 0.009 U 0.008 U 0.1 U 0.1 U 0.2 U 0.5Xylenes (total) 0.009 U 0.008 U 0.51 1.4 1.9 2.4Styrene NA NA NA NA NA NA



RCRA Metals and Cyanide (mg/kg)Arsenic NA NA NA NA NA NABarium NA NA NA NA NA NACadmium NA NA NA NA NA NAChromium NA NA NA NA NA NALead NA NA NA NA NA NAMercury NA NA NA NA NA NASelenium NA NA NA NA NA NASilver NA NA NA NA NA NACyanide NA NA NA NA NA NANotes:1) J - Estimated value.2) U - Compound/analyte not detected. The associated numerical value is the reporting limit.3) NA - Not analyzed.



Aurora MGP Site


Compound/Analyte 12.3-14.3 14.3-16.9 0.3-2.3 2.3-4.3 4.3-6.3 6.3-8.3BTEX and Styrene (mg/kg)

Benzene 30 U 30 U 0.006 U 0.005 U 0.006 U 0.24Ethylbenzene 30 U 30 U 0.006 U 0.005 U 0.006 U 0.87Toluene 30 U 30 0.006 U 0.005 U 0.006 U 0.1 UXylenes (total) 30 U 44 0.006 U 0.005 U 0.007 0.5Styrene 30 U 30 U NA NA NA 0.1 U

Phenols (mg/kg)2,4-Dimethylphenol 5.2 UJ 0.45 U NA NA NA 2.2 U2-Methylphenol 5.2 UJ 0.45 U NA NA NA 2.2 U3-, 4-Methylphenol 5.2 UJ 0.45 U NA NA NA 2.2 UPhenol 5.2 UJ 0.45 U NA NA NA 2.2 U

PAHs (mg/kg)Acenaphthene 7.1 J 9.3 NA NA NA 2.2Acenaphthylene 6.3 J 5.5 NA NA NA 2.2 UAnthracene 5.2 UJ 0.45 U NA NA NA 2.2Benzo(a)anthracene 9.4 J 5.3 NA NA NA 4.1Benzo(b)fluoranthene 5.2 UJ 3.1 NA NA NA 2.2Benzo(k)fluoranthene 5.7 J 3 NA NA NA 2.6Benzo(a)pyrene 6 J 3.1 NA NA NA 3.1Benzo(g,h,i)perylene 5.2 UJ 1.3 NA NA NA 2.2 UChrysene 11 J 5 NA NA NA 4.1Dibenzo(a,h)anthracene 5.2 UJ 0.5 NA NA NA 2.2 UFluoranthene 13 J 11 NA NA NA 7.9Fluorene 7 J 8 NA NA NA 2.2 UIndeno(1,2,3-cd)pyrene 5.2 UJ 1.3 NA NA NA 2.2 UNaphthalene 25 J 33 NA NA NA 2.2 UPhenanthrene 29 J 31 NA NA NA 9.6Pyrene 17 J 13 NA NA NA 9.2Dibenzofuran 5.2 UJ 2.3 NA NA NA 2.2 U2-Methylnaphthalene 15 J 8 NA NA NA 2.2 U

RCRA Metals and Cyanide (mg/kg)Arsenic NA NA NA NA NA NABarium NA NA NA NA NA NACadmium NA NA NA NA NA NAChromium NA NA NA NA NA NALead NA NA NA NA NA NAMercury NA NA NA NA NA NASelenium NA NA NA NA NA NASilver NA NA NA NA NA NACyanide NA NA NA NA NA NANotes:1) J - Estimated value.2) U - Compound/analyte not detected. The associated numerical value is the reporting limit.3) NA - Not analyzed.



Aurora MGP Site

Sample Location and Depth (feet below ground surface)/ConcentrationSB46-005 SB46-007 SB46-008

Compound/Analyte 8.3-10.3 12.3-14 14-15.9BTEX and Styrene (mg/kg)

Benzene 0.22 0.094 J 0.39Ethylbenzene 0.52 0.37 0.99Toluene 0.1 U 0.1 U 0.3 UXylenes (total) 0.34 0.34 0.83Styrene NA NA 0.3 U

Phenols (mg/kg)2,4-Dimethylphenol NA NA 22 UJ2-Methylphenol NA NA 22 UJ3-, 4-Methylphenol NA NA 22 UJPhenol NA NA 22 UJ

PAHs (mg/kg)Acenaphthene NA NA 22 UJAcenaphthylene NA NA 42 JAnthracene NA NA 29 JBenzo(a)anthracene NA NA 22 JBenzo(b)fluoranthene NA NA 22 UJBenzo(k)fluoranthene NA NA 22 UJBenzo(a)pyrene NA NA 22 UJBenzo(g,h,i)perylene NA NA 22 UJChrysene NA NA 22 UJDibenzo(a,h)anthracene NA NA 22 UJFluoranthene NA NA 46 JFluorene NA NA 33 JIndeno(1,2,3-cd)pyrene NA NA 22 UJNaphthalene NA NA 221 JPhenanthrene NA NA 99 JPyrene NA NA 48 JDibenzofuran NA NA 22 UJ2-Methylnaphthalene NA NA 96 J

RCRA Metals and Cyanide (mg/kg)Arsenic NA NA NABarium NA NA NACadmium NA NA NAChromium NA NA NALead NA NA NAMercury NA NA NASelenium NA NA NASilver NA NA NACyanide NA NA NANotes:1) J - Estimated value.2) U - Compound/analyte not detected. The associated numerical value is the reporting limit.3) NA - Not analyzed.


Table E-2Structure Area Target Compound List (TCL) Analytical Results

Aurora MGP Site


(SB07-002)1 (SB08-003)1 (SB09-002)1 (SB09-003)1 SB45-007 SB45-008Compound/Analyte 8-10 16-18 4-6 10-12 12.3-14.3 14.3-16.9

TCL Volatiles (mg/kg)Acetone 16 U NA 5 U NA 510 U 546 UBenzene 110 NA 21 NA 30 U 30 UBromodichloromethane 1.6 U NA 0.5 U NA 60 U 40 UBromoform 0.8 U NA 0.25 U NA 30 U 30 UBromomethane (methyl bromide) 1.6 U NA 0.5 U NA 60 U 40 U2-Butanone 1.6 U NA 0.5 U NA 60 U 40 UCarbon disulfide 1.6 U NA 0.5 U NA 60 U 40 UCarbon tetrachloride 0.8 U NA 0.25 U NA 30 U 30 UChlorobenzene 0.8 U NA 0.25 U NA 30 U 27 UChloroethane 1.6 U NA 0.5 U NA 60 U 40 UChloroform 0.8 U NA 0.25 U NA 30 U 30 UChloromethane 1.6 U NA 0.5 U NA 60 U 40 UChlorodibromomethane 0.8 U NA 0.25 U NA 30 U 30 U1,1-Dichloroethane 0.8 U NA 0.25 U NA 30 U 30 U1,2-Dichloroethane 0.8 U NA 0.25 U NA 30 U 30 U1,1-Dichloroethene 0.64 U NA 0.2 U NA 20 U 20 Ucis-1,2-Dichloroethene 0.64 U NA 0.2 U NA 20 U 20 Utrans-1,2-Dichloroethene 0.8 U NA 0.25 U NA 30 U 30 U1,2-Dichloropropane 0.8 U NA 0.25 U NA 30 U 30 Ucis-1,3-Dichloropropene 0.8 U NA 0.25 U NA 30 U 30 Utrans-1,3-Dichloropropene 0.8 U NA 0.25 U NA 30 U 30 UEthylbenzene 19 NA 6.6 NA 30 U 30 U2-Hexanone 1.6 U NA 0.5 U NA 60 U 40 UMethylene chloride 0.8 U NA 0.25 U NA 30 U 30 U4-Methyl-2-pentanone 1.6 U NA 0.5 U NA 60 U 40 UStyrene 120 NA 0.25 U NA 30 U 30 U1,1,2,2-Tetrachloroethane 0.8 U NA 0.25 U NA 30 U 30 UTetrachloroethene 0.8 U NA 0.25 U NA 30 U 30 UToluene 150 NA 0.68 NA 30 U 301,1,1-Trichloroethane 0.8 U NA 0.25 U NA 30 U 30 U1,1,2-Trichloroethane 0.8 U NA 0.5 U NA 30 U 30 UTrichloroethene 0.8 U NA 0.25 U NA 30 U 30 UVinly chloride 1.6 U NA 0.5 U NA 60 U 40 UXylenes (total) 110 NA 7.3 NA 30 U 44

TCL Semivolatiles (mg/kg)4-Chloro-3-methylphenol 200 UJ 4.6 UJ 130 UJ 6.6 UJ 5.2 UJ 0.45 U2-Chlorophenol 200 UJ 4.6 UJ 130 UJ 6.6 UJ 5.2 UJ 0.45 U2,4-Dichlorophenol 200 UJ 4.6 UJ 130 UJ 6.6 UJ 5.2 UJ 0.45 U2,4-Dimethylphenol 200 UJ 4.6 UJ 130 UJ 6.6 UJ 5.2 UJ 0.45 U2,4-Dinitrophenol 970 UJ 22 UJ 640 UJ 32 UJ 25 UJ 2.2 U2-Methyl-4,6-dinitrophenol 970 UJ 22 UJ 640 UJ 32 UJ 25 UJ 2.2 U2-Methylphenol 200 UJ 4.6 UJ 130 UJ 6.6 UJ 5.2 UJ 0.45 U3-, 4-Methylphenol 200 UJ 4.6 UJ 130 UJ 6.6 UJ 5.2 UJ 0.45 UNotes:1) Sample collected during the 1995-1996 site investigation.2) J - Estimated value.3) U - Indicates the analyte was not detected. The associated numerical value is the reporting limit.4) NA - Not analyzed.


Table E-2 (Continued)Structure Area Target Compound List (TCL) Analytical Results

Aurora MGP Site



TCL Semivolatiles (mg/kg) (Continued)2-Nitrophenol 200 UJ 4.6 UJ 130 UJ 6.6 UJ 5.2 UJ 0.45 U4-Nitrophenol 970 UJ 22 UJ 640 UJ 32 UJ 25 UJ 2.2 UPentachlorophenol 970 UJ 22 UJ 640 UJ 32 UJ 25 UJ 2.2 UPhenol 200 UJ 4.6 UJ 130 UJ 6.6 UJ 5.2 UJ 0.45 U2,4,5-Trichlorophenol 200 UJ 4.6 UJ 130 UJ 6.6 UJ 5.2 UJ 0.45 U2,4,6-Trichlorophenol 200 UJ 4.6 UJ 130 UJ 6.6 UJ 5.2 UJ 0.45 UBenzyl butyl phthalate 200 UJ 4.6 UJ 130 UJ 6.6 UJ 5.2 UJ 0.45 UBis(2-chloroethoxy)methane 200 UJ 4.6 UJ 130 UJ 6.6 UJ 5.2 UJ 0.45 UBis(2-chloroethyl)ether 200 UJ 4.6 UJ 130 UJ 6.6 UJ 5.2 UJ 0.45 UBis(2-chloroisopropyl)ether 200 UJ 4.6 UJ 130 UJ 6.6 UJ 5.2 UJ 0.45 UBis(2-ethylhexyl)phthalate 200 UJ 4.6 UJ 130 UJ 6.6 UJ 5.2 UJ 0.45 U4-Bromophenyl phenyl ether 200 UJ 4.6 UJ 130 UJ 6.6 UJ 5.2 UJ 0.45 UCarbazole 200 UJ 12 J 130 UJ 6.6 UJ 5.2 UJ 1.24-Chloroaniline 200 UJ 4.6 UJ 130 UJ 6.6 UJ 5.2 UJ 0.45 U2-Chloronaphthalene 200 UJ 4.6 UJ 130 UJ 6.6 UJ 5.2 UJ 0.45 U4-Chlorophenyl phenyl ether 200 UJ 4.6 UJ 130 UJ 6.6 UJ 5.2 UJ 0.45 UDibenzofuran 200 UJ 71 J 130 UJ 67 J 5.2 UJ 2.3Di-n-butyl phthalate 200 UJ 4.6 UJ 130 UJ 6.6 UJ 5.2 UJ 0.48 UB1,2-Dichlorobenzene 200 UJ 4.6 UJ 130 UJ 6.6 UJ 5.2 UJ 0.45 U1,3-Dichlorobenzene 200 UJ 4.6 UJ 130 UJ 6.6 UJ 5.2 UJ 0.45 U1,4-Dichlorobenzene 200 UJ 4.6 UJ 130 UJ 6.6 UJ 5.2 UJ 0.45 U3,3-Dichlorobenzidine 400 UJ 9.2 UJ 260 UJ 13 UJ 10 UJ 0.9 UDiethyl phthalate 200 UJ 4.6 UJ 130 UJ 6.6 UJ 5.2 UJ 0.45 UDimethyl phthalate 200 UJ 4.6 UJ 130 UJ 6.6 UJ 5.2 UJ 0.45 U2,4-Dinitrotoluene 200 UJ 4.6 UJ 130 UJ 6.6 UJ 5.2 UJ 0.45 U2,6-Dinitrotoluene 200 UJ 4.6 UJ 130 UJ 6.6 UJ 5.2 UJ 0.45 UDi-n-octyl phthalate 200 UJ 4.6 UJ 130 UJ 6.6 UJ 5.2 UJ 0.45 UHexachlorobenzene 200 UJ 4.6 UJ 130 UJ 6.6 UJ 5.2 UJ 0.45 UHexachlorobutadiene 200 UJ 4.6 UJ 130 UJ 6.6 UJ 5.2 UJ 0.45 UHexachlorocyclopentadiene 200 UJ 4.6 UJ 130 UJ 6.6 UJ 5.2 UJ 0.45 UHexachloroethane 200 UJ 4.6 UJ 130 UJ 6.6 UJ 5.2 UJ 0.45 UIsophorone 200 UJ 4.6 UJ 130 UJ 6.6 UJ 5.2 UJ 0.45 U2-Methylnaphthalene 800 J 19 J 900 J 1110 J 15 J 8.02-Nitroaniline 970 UJ 22 UJ 640 UJ 32 UJ 25 UJ 2.2 U3-Nitroaniline 970 UJ 22 UJ 640 UJ 32 UJ 25 UJ 2.2 U4-Nitroaniline 970 UJ 22 UJ 640 UJ 32 UJ 25 UJ 2.2 UNitrobenzene 200 UJ 4.6 UJ 130 UJ 6.6 UJ 5.2 UJ 0.45 UN-nitrosodimethylamine 200 UJ 4.6 UJ 130 UJ 6.6 UJ 5.2 UJ 0.45 UN-nitrosodi-n-propylamine 200 UJ 4.6 UJ 130 UJ 6.6 UJ 5.2 UJ 0.45 UN-nitrosodiphenylamine 200 UJ 4.6 UJ 130 UJ 6.6 UJ 5.2 UJ 0.45 U1,2,4-Trichlorobenzene 200 UJ 4.6 UJ 130 UJ 6.6 UJ 5.2 UJ 0.45 UAcenaphthene 317 J 22 215 J 285 J 7.1 J 9.3Acenaphthylene 943 J 77.4 376 J 260 J 6.3 J 5.5Notes:1) Sample collected during the 1995-1996 site investigation.2) J - Estimated value.3) U - Indicates the analyte was not detected. The associated numerical value is the reporting limit.4) B - Analyte was also found in the method blank analysis.



Aurora MGP Site



TCL Semivolatiles (mg/kg) (Continued)Anthracene 94 J 140 345 J 330 J 5.2 UJ 0.45 UBenzo(a)anthracene 91 J 54.9 260 J 170 J 9.4 J 5.3Benzo(b)fluoranthene 20 J 20.8 170 J 130 J 5.2 UJ 3.1Benzo(k)fluoranthene 14 J 16.6 160 J 85 J 5.7 J 3.0Benzo(a)pyrene 63 J 38.3 780 J 177 J 6.0 J 3.1Benzo(g,h,i)perylene 42 J 13.9 170 J 36 J 5.2 UJ 1.3Chrysene 51 J 38.3 270 J 180 J 11 J 5Dibenzo(a,h)anthracene 2 J 3.1 58 J 165 UJ 5.2 UJ 0.45Fluoranthene 307 J 162 630 J 420 J 13 J 11Fluorene 449 J 88.5 570 J 350 J 7.0 J 8.0Indeno(1,2,3-cd)pyrene 26 J 13.1 170 J 165 UJ 5.2 UJ 1.3Naphthalene 1640 J 649 8200 J 3200 J 25 J 33Phenanthrene 409 J 316 1500 J 956 J 29 J 31Pyrene 185 J 152 812 J 165 UJ 17 J 13Notes:1) Sample collected during the 1995-1996 site investigation.2) J - Estimated value.3) U - Indicates the anlyte was not detected. The associated numerical value is the reporting limit.



Aurora MGP Site


Compound/Analyte 6.3-8.3 14.0-15.9TCL Volatiles (mg/kg)

Acetone 2.3 U 5.2 UBenzene 0.24 0.39Bromodichloromethane 0.2 U 0.4 UBromoform 0.1 U 0.3 UBromomethane (methyl bromide) 0.2 U 0.4 U2-Butanone 0.2 U 0.4 UCarbon disulfide 0.2 U 0.4 UCarbon tetrachloride 0.1 U 0.3 UChlorobenzene 0.1 U 0.3 UChloroethane 0.2 U 0.4 UChloroform 0.1 U 0.3 UChloromethane 0.2 U 0.4 UChlorodibromomethane 0.1 U 0.3 U1,1-Dichloroethane 0.1 U 0.3 U1,2-Dichloroethane 0.1 U 0.3 U1,1-Dichloroethene 0.09 U 0.3 Ucis-1,2-Dichloroethene 0.09 U 0.2 Utrans-1,2-Dichloroethene 0.1 U 0.3 U1,2-Dichloropropane 0.1 U 0.3 Ucis-1,3-Dichloropropene 0.1 U 0.3 Utrans-1,3-Dichloropropene 0.1 U 0.3 UEthylbenzene 0.87 0.992-Hexanone 0.2 U 0.4 UMethylene chloride 0.1 U 0.3 U4-Methyl-2-pentanone 0.2 U 0.4 UStyrene 0.1 U 0.3 U1,1,2,2-Tetrachloroethane 0.1 U 0.3 UTetrachloroethene 0.1 U 0.3 UToluene 0.1 U 0.3 U1,1,1-Trichloroethane 0.1 U 0.3 U1,1,2-Trichloroethane 0.1 U 0.3 UTrichloroethene 0.1 U 0.3 UVinly chloride 0.2 U 0.4 UXylenes (total) 0.50 0.83

TCL Semivolatiles (mg/kg)4-Chloro-3-methylphenol 2.2 U 22 UJ2-Chlorophenol 2.1 U 22 UJ2,4-Dichlorophenol 2.2 U 22 UJ2,4-Dimethylphenol 2.2 U 22 UJ2,4-Dinitrophenol 10 U 100 UJ2-Methyl-4,6-dinitrophenol 10 U 100 UJ2-Methylphenol 2.2 U 22 UJ3-, 4-Methylphenol 2.2 U 22 UJNotes:1) J - Estimated value.2) U - Indicates the analyte was not detected. The associated numerical value is the reporting limit.



Aurora MGP Site


Compound/Analyte 6.3-8.3 14.0-15.9TCL Semivolatiles (mg/kg) (Continued)

2-Nitrophenol 2.2 U 22 UJ4-Nitrophenol 10 U 100 UJPentachlorophenol 10 U 100 UJPhenol 2.2 U 22 UJ2,4,5-Trichlorophenol 2.2 U 22 UJ2,4,6-Trichlorophenol 2.2 U 22 UJBenzyl butyl phthalate 2.2 U 21 UJBis(2-chloroethoxy)methane 2.2 U 22 UJBis(2-chloroethyl)ether 2.2 U 22 UJBis(2-chloroisopropyl)ether 2.2 U 22 UJBis(2-ethylhexyl)phthalate 2.2 U 22 UJ4-Bromophenyl phenyl ether 2.2 U 22 UJCarbazole 2.2 U 22 UJ4-Chloroaniline 2.2 U 22 UJ2-Chloronaphthalene 2.2 U 22 UJ4-Chlorophenyl phenyl ether 2.2 U 22 UJDibenzofuran 2.2 U 22 UJDi-n-butyl phthalate 2.2 U 22 UJ1,2-Dichlorobenzene 2.2 U 22 UJ1,3-Dichlorobenzene 2.2 U 22 UJ1,4-Dichlorobenzene 2.2 U 22 UJ3,3-Dichlorobenzidine 4.4 U 43 UJDiethyl phthalate 2.2 U 22 UJDimethyl phthalate 2.2 U 22 UJ2,4-Dinitrotoluene 2.2 U 22 UJ2,6-Dinitrotoluene 2.2 U 22 UJDi-n-octyl phthalate 2.2 U 22 UJHexachlorobenzene 2.2 U 22 UJHexachlorobutadiene 2.2 U 22 UJHexachlorocyclopentadiene 2.2 U 22 UJHexachloroethane 2.2 U 22 UJIsophorone 2.2 U 22 UJ2-Methylnaphthalene 2.2 U 96 J2-Nitroaniline 10 U 100 UJ3-Nitroaniline 10 U 100 UJ4-Nitroaniline 10 U 100 UJNitrobenzene 2.2 U 22 UJN-nitrosodimethylamine 2.2 U 22 UJN-nitrosodi-n-propylamine 2.2 U 22 UJN-nitrosodiphenylamine 2.2 U 22 UJ1,2,4-Trichlorobenzene 2.2 U 22 UJAcenaphthene 2.2 22 UJAcenaphthylene 2.2 U 42 JNotes:1) J - Estimated value.2) U - Indicates the analyte was not detected. The associated numerical value is the reporting limit.



Aurora MGP Site


Compound/Analyte 6.3-8.3 14.0-15.9TCL Semivolatiles (mg/kg) (Continued)

Anthracene 2.2 29 JBenzo(a)anthracene 4.1 22 JBenzo(b)fluoranthene 2.2 22 UJBenzo(k)fluoranthene 2.6 22 UJBenzo(a)pyrene 3.1 22 UJBenzo(g,h,i)perylene 2.2 U 22 UJChrysene 4.1 22 UJDibenzo(a,h)anthracene 2.2 U 22 UJFluoranthene 7.9 46 JFluorene 2.2 U 33 JIndeno(1,2,3-cd)pyrene 2.2 U 22 UJNaphthalene 2.2 U 221 JPhenanthrene 9.6 99 JPyrene 9.2 48 JNotes:1) J - Estimated value.2) U - Indicates the anlyte was not detected. The associated numerical value is the reporting limit.


Table E-3Structure Area Reactivity and Toxicity Characteristics Analytical Results

Aurora MGP Site


(SB07-002)1 (SB07-003)1 (SB08-003)1 (SB09-003)1 SB42-003Compound/Analyte 8-10 10-11 16-18 10-12 4.0-6.0

Miscellaneous AnalysesFlashpoint (Degree F) >200 124 >200 NA >200BTU (BTU/lb) 6889 6706 NA 4420 NACyanide, Reactive (ug/g) 50 U 50 U 50 U 50 U 10 UMoisture, Karl Fischer (%) 14.4 20.0 26.6 33.9 NAOil & Grease (%) 1.7 0.31 0.35 2.7 NASulfide, Reactive (ug/g) 50 U 50 U 50 U 671 20 U

Inorganic Toxicity Characteristic Leaching Procedure (mg/l)Arsenic 0.0131 0.0144 0.0246 0.0050 U 0.20 UBarium 0.415 0.427 0.675 1.04 0.134Cadmium 0.060 0.050 0.010 U 0.010 U 0.010 UChromium 0.040 U 0.040 U 0.040 U 0.040 U 0.040 ULead 0.0050 U 0.0050 U 0.0050 U 0.0050 U 0.200 UMercury 0.0004 U 0.0004 U 0.0004 U 0.0004 U 0.0002 USelenium 0.0050 U 0.0050 U 0.010 U 0.005 U 0.20 USilver 0.040 U 0.040 U 0.040 U 0.040 U 0.20 U

Volatile Toxicity Characteristic Leaching Procedure (mg/l)Benzene 5.1 3.4 0.32 2.1 0.20Carbon Tetrachloride 0.020 U 0.020 U 0.020 U 0.10 U 0.020 UChlorobenzene 0.020 U 0.020 U 0.020 U 0.10 U 0.020 UChloroform 0.020 U 0.020 U 0.020 U 0.10 U 0.020 U1,4-Dichlorobenzene 0.020 U 0.020 U 0.020 U 0.10 U 0.020 U1,2-Dichloroethane 0.020 U 0.020 U 0.020 U 0.10 U 0.020 U1,1-Dichloroethene 0.020 U 0.020 U 0.020 U 0.10 U 0.020 UMethyl Ethyl Ketone 0.40 U 0.40 U 0.40 U 2.0 U 0.40 UTetrachloroethene 0.020 U 0.540 0.020 U 0.10 U 0.020 UTrichloroethene 0.020 U 0.020 U 0.02 U 0.10 U 0.020 UVinyl chloride 0.020 U 0.020 U 0.02 U 0.10 U 0.020 U

BNA Toxicity Characteristic Leaching Procedure (mg/l)Cresols 0.10 U 0.10 U 0.10 U 2.1 U 0.10 U3-Methylphenol (m-cresol) 0.10 U 0.10 U 0.10 U 0.1 U 0.10 U2-Methylphenol (o-cresol) 0.10 U 0.10 U 0.10 U 0.1 U 0.10 U4-Methylphenol (p-cresol) 0.10 U 0.10 U 0.10 U 0.1 U 0.10 UPentachlorophenol 0.50 U 0.50 U 0.50 U 0.1 U 0.50 U2,4,5-Trichlorophenol 0.50 U 0.50 U 0.50 U 0.1 U 0.50 U2,4,6-Trichlorophenol 0.10 U 0.10 U 0.10 U NA 0.10 U1,4-Dichlorobenzene 0.10 U 0.10 U 0.10 U NA 0.10 UHexachloroethane 0.10 U 0.10 U 0.10 U NA 0.10 UNitrobenzene 0.10 U 0.10 U 0.10 U NA 0.10 UHexachlorobutadiene 0.10 U 0.10 U 0.10 U NA 0.10 U2,4-Dinitrotoluene 0.10 U 0.10 U 0.10 U NA 0.10 UHexachlorobenzene 0.10 U 0.10 U 0.10 U NA 0.10 UPyridine 0.10 U 0.10 U 0.10 U NA 0.10 UNotes:1) Sample collected during the 1995-1996 site investigation.2) U - Indicates the analyte was not detected. The associated numerical value is the reporting limit.3) NA - Not analyzed.


Table E-3 (Continued)Structure Area Reactivity and Toxicity Characteristics Analytical Results

Aurora MGP Site


Compound/Analyte 0.2-2.2 2.3-4.3 14.3-16.9 0.3-2.3 14.0-15.9Miscellaneous Analyses

Flashpoint (Degree F) >200 >200 >200 >200 >200BTU (BTU/lb) NA NA NA NA NACyanide, Reactive (ug/g) 10 U 10 U 10 U 10 U 10 UMoisture, Karl Fischer (%) NA NA NA NA NAOil & Grease (%) NA NA NA NA NASulfide, Reactive (ug/g) 20 U 10 U 63 10 U 91

Inorganic Toxicity Characteristic Leaching Procedure (mg/l)Arsenic 0.20 U 0.20 U 0.20 U 0.20 U 0.20 UBarium 0.111 0.172 0.410 0.602 0.246Cadmium 0.010 U 0.010 U 0.010 U 0.010 U 0.010 UChromium 0.040 U 0.040 U 0.040 U 0.040 U 0.040 ULead 0.200 U 0.200 U 0.200 U 0.200 U 0.200 UMercury 0.0002 U 0.0002 U 0.0002 U 0.0002 U 0.0002 USelenium 0.20 U 0.20 U 0.20 U 0.20 U 0.20 USilver 0.20 U 0.25 U 0.25 U 0.25 U 0.25 U

Volatile Toxicity Characteristic Leaching Procedure (mg/l)Benzene 0.020 U 0.020 U 1.0 0.020 U 0.088Carbon Tetrachloride 0.020 U 0.020 U 0.020 U 0.020 U 0.020 UChlorobenzene 0.020 U 0.020 U 0.020 U 0.020 U 0.020 UChloroform 0.10 U 0.020 U 0.020 U 0.020 U 0.10 U1,4-Dichlorobenzene 0.020 U 0.020 U 0.020 U 0.020 U 0.020 U1,2-Dichloroethane 0.020 U 0.020 U 0.020 U 0.020 U 0.020 U1,1-Dichloroethene 0.020 U 0.020 U 0.020 U 0.020 U 0.020 UMethyl Ethyl Ketone 0.40 U 0.40 U 0.40 U 0.40 U 0.40 UTetrachloroethene 0.020 U 0.020 U 0.020 U 0.020 U 0.020 UTrichloroethene 0.020 U 0.020 U 0.020 U 0.020 U 0.020 UVinyl chloride 0.020 U 0.020 U 0.020 U 0.020 U 0.020 U

BNA Toxicity Characteristic Leaching Procedure (mg/l)Cresols 0.10 U 0.10 U 0.73 0.10 U 7.63-Methylphenol (m-cresol) 0.10 U 0.10 U NA 0.10 U NA2-Methylphenol (o-cresol) 0.10 U 0.10 U 0.17 0.10 U 1.54-Methylphenol (p-cresol) 0.10 U 0.10 U 0.56 0.10 U 6.1Pentachlorophenol 0.50 U 0.50 U 0.50 U 0.50 U 0.50 U2,4,5-Trichlorophenol 0.50 U 0.50 U 0.50 U 0.50 U 0.50 U2,4,6-Trichlorophenol 0.10 U 0.10 U 0.10 U 0.10 U 0.10 U1,4-Dichlorobenzene 0.10 U 0.10 U 0.10 U 0.10 U 0.10 UHexachloroethane 0.10 U 0.10 U 0.10 U 0.10 U 0.10 UNitrobenzene 0.10 U 0.10 U 0.10 U 0.10 U 0.10 UHexachlorobutadiene 0.10 U 0.10 U 0.10 U 0.10 U 0.10 U2,4-Dinitrotoluene 0.10 U 0.10 U 0.10 U 0.10 U 0.10 UHexachlorobenzene 0.10 U 0.10 U 0.10 U 0.10 U 0.10 UPyridine 0.10 U 0.10 U 0.10 U 0.10 U 0.10 UNotes:1) U - Indicates the analyte was not detected. The associated numerical value is the reporting limit.2) NA - Not analyzed.


APPENDIX F SOIL AND BEDROCK DRILLING LOGS

SUPPLEMENTAL SITE INVESTIGATION AURORA MGP SITE

APPENDIX G WELL INSTALLATION LOGS


APPENDIX H SLUG TEST DATA ANALYSIS


Aurora MGP Site H-1 SSI Report

INTRODUCTION: Falling head slug tests were performed at the following eleven monitoring wells to delineate hydrogeological characteristic of the site. The eleven wells are SMW10, SMW11, SMW12, SMW13, SMW14, DMW05, DMW10, DMW11, DMW12, DMW13 and DMW14. The drawdown of hydraulic head during the slug tests was monitored and recorded by a pressure transducer (MiniTroll) and a datalogger (In-Situ, Inc.), respectively. The field data from the slug test was analyzed by Super Slug (Version 3.0, Startpoint Software, Inc.). To derive the hydrogeological data of the site from the slug test, some assumptions were made and are summarized in the following section. ASSUMPTIONS: • Based upon drilling logs for eleven wells (see Appendix G – Well Installation Logs), the

aquifer where the wells were installed was considered an unconfined aquifer except for DMW10, DMW11, DMW12, and DMW13. Two criteria were used to determine that these four wells were installed in a confined aquifer: the lithology and the significant hydraulic head difference between the shallow well and corresponding deep well.

• Monitoring wells were considered to be partially penetrated wells based on locations and

lengths of the screened intervals of the monitoring wells and based on site lithology such as vertical profile of stratified layers.

• Bouwer and Rice Graphical Method for Case C was used to interpret and analyze the data for

the case of a partially penetrated well and unconfined aquifer. Hvorsev Graphical Method for Case B defined in Super Slug was used to interpret and analyze data for the case of a partially penetrated well and confined aquifer.

• The ratio of horizontal conductivity to vertical conductivity of the aquifer was assumed to be

one. • The bottom of the well screen interval is also the bottom of the aquifer. • The Hvorslev method is commonly implemented with one of two assumptions. The first is

that the best-fit line should be drawn with all points weighted equally. The second is that the line is always drawn through H0 = 1.0 and is best fit to the remaining points with a dynamic hydraulic head. In this data analysis, the second assumption was utilized.

• Only a certain portion of the monitored field data from the test was used. The data after a

certain time was excluded in the analysis due to an insignificant hydraulic head change.

Aurora MGP Site H-2 SSI Report

RESULTS: The test results, including relevant information, are summarized in the following table. The detailed analysis results are presented in the following plots.

Well Shape

Factor* (unitless)

Initial Head*

(ft)

Conductivity* (ft/day)

Conductivity* (cm/s)

Thickness of Aquifer**

(ft)

Transmissivity* (m2/day)

Shallow Groundwater Monitoring Well SMW-10 1.572 6.86 8.534 3.011 X 10-3 8.51 6.747 SMW-11 1.572 10.22 12.33 4.349 X 10-3 10.66 12.21 SMW-12 1.572 8.776 24.42 8.617 X 10-3 8.87 20.13 SMW-13 1.572 9.327 2.278 8.037 X 10-4 10.87 2.301 SMW-14 1.572 8.624 0.8881 3.133 X 10-4 10.12 0.835

Deep Groundwater Monitoring Well DMW05 2.94 30.55 0.4687 1.653 X 10-4 32.6 1.419 DMW10 4.643 20.54 1.293 4.56 X 10-4 23.33 2.802 DMW11 4.643 31.2 1.459 5.146 X 10-4 30.75 4.168 DMW12 4.643 24.56 0.6296 2.221 X 10-4 18.1 1.059 DMW13 4.643 33.18 0.09654 3.406 X10-5 20.5 0.1839 DMW14 2.94 28.8 0.201 7.092 X10-5 41.25 0.7704

Notes: * - Derived from Super Slug based on the field data **- Based upon static water level recorded in the field for the shallow well case. For the deep wells, the actual thickness of aquifer is

derived from the drilling log (see Appendix F – Soil and Bedrock Drilling Logs and Appendix G – Well Installation Logs) since the aquifer in some locations is a confined aquifer.

DISCUSSION: Derived K values from these eleven slug tests revealed that the shallow aquifer across the site is more permeable than the deep aquifer. This is consistent with hydraulic conductivities obtained from the previous slug tests (Black & Veatch, 1998, Site Investigation Report). The observed vertical profile of the hydraulic conductivities across the site can be explained by the site lithology (i.e., silty gravel is a main component of the aquifer in the shallow aquifer and the deep aquifer predominantly consists of fractured dolomite).

* * * * *

APPENDIX I GEOPHYSICAL ANALYSIS LABORATORY DATA SHEETS


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