FINAL 2002 OPERATIONS AND MAINTENANCE REPORT · F:\USER\SHARE\KEARSARGE ESD DOCS\46949\02RPTR_FNL.DOC 1-1 10/6/2003 1. INTRODUCTION This 2002 Operations and Maintenance (O&M) Report

$Page 1: FINAL 2002 OPERATIONS AND MAINTENANCE REPORT · F:\USER\SHARE\KEARSARGE ESD DOCS\46949\02RPTR_FNL.DOC 1-1 10/6/2003 1. INTRODUCTION This 2002 Operations and Maintenance (O&M) Report$
FINAL

2002 OPERATIONS AND MAINTENANCE REPORT KEARSARGE METALLURGICAL CORPORATION

SUPERFUND SITE CONWAY, NEW HAMPSHIRE

Prepared for:

NEW HAMPSHIRE DEPARTMENT OF ENVIRONMENTAL SERVICES

6 Hazen Drive Concord, New Hampshire 03301

Prepared by:

WESTON SOLUTIONS, INC One Wall Street

Manchester, New Hampshire 03101-1501

May 2003

W.O. No. 01395.022.008

MNH|F:\USER\SHARE\KEARSARGE ESD DOCS\46949\TOC.DOC 6 OCTOBER 2003 i

MNH|F:\USER\SHARE\KEARSARGE ESD DOCS\46949\TOC.DOC 6 OCTOBER 2003 ii

TABLE OF CONTENTS

Section Page

1. INTRODUCTION ..................................................................................................... 1-1

2. GROUNDWATER EXTRACTION AND TREATMENT SYSTEM ..................... 2-1 2.1 SUMMARY OF VOLUMES PROCESSED .................................................... 2-1

2.2 INFLUENT/EFFLUENT QUALITY ............................................................... 2-2 2.3 UNIT PROCESS PERFORMANCE ................................................................ 2-4

2.3.1 Hobbs Street Wells ............................................................................... 2-4 2.3.2 Culvert Area Wells ............................................................................... 2-5 2.3.3 Groundwater Collection Trench and Associated Extraction Well .......... 2-6 2.3.4 Equalization and Metals Removal System ............................................ 2-6 2.3.5 Organic Contaminants Removal System............................................... 2-7

3. TREATMENT SYSTEM MAINTENANCE AND MODIFICATIONS ................. 3-1

4. GROUNDWATER SAMPLING AND ANALYSIS................................................. 4-1 4.1 LONG-TERM MONITORING........................................................................ 4-1

4.2 GROUNDWATER SAMPLING RESULTS .................................................... 4-2

5. ADDITIONAL INVESTIGATIONS ........................................................................ 5-1 5.1 PASSIVE SOIL GAS SURVEY ...................................................................... 5-1 5.2 VERTICAL PROFILING INVESTIGATION.................................................. 5-1

5.3 SOIL SAMPLE INVESTIGATION USING GEOPROBE ............................... 5-2 5.4 AQUITARD (CONFINING) LAYER.............................................................. 5-3

6. HISTORICAL GROUNDWATER DATABASE..................................................... 6-1

7. CONCLUSIONS AND RECOMMENDATIONS .................................................... 7-1 7.1 CONCLUSIONS ............................................................................................. 7-1 7.2 RECOMMENDATIONS ................................................................................. 7-2

MNH|F:\USER\SHARE\KEARSARGE ESD DOCS\46949\TOC.DOC 6 OCTOBER 2003 iii

LIST OF FIGURES

Title

Figure 1 Operations Report Site Plan

Figure 2 Process Flow Diagram

Figure 3 GWTP Average Monthly Flow Rate - Treated

Figure 4 Historical Well Data Total Chlorinated Solvents 1995 through 2002

Figure 5A Contaminant Concentrations in Well MW-4 as a Percent of Cleanup Goals

Figure 5B Contaminant Concentrations in Well MW-7 as a Percent of Cleanup Goals

Figure 5C Contaminant Concentrations in Well MW-114 as a Percent of Cleanup Goals

Figure 5D Contaminant Concentrations in Well MW-203 as a Percent of Cleanup Goals

Figure 5E Contaminant Concentrations in Well MW-205 as a Percent of Cleanup Goals

Figure 5F Contaminant Concentrations in Well MW-211 as a Percent of Cleanup Goals

Figure 5G Contaminant Concentrations in Well MW-213 as a Percent of Cleanup Goals

Figure 5H Contaminant Concentrations in Well CDM-1 as a Percent of Cleanup Goals

Figure 5I Contaminant Concentrations in Well EW-1 as a Percent of Cleanup Goals

Figure 5J Contaminant Concentrations in Well EW-2 as a Percent of Cleanup Goals

Figure 5K Contaminant Concentrations in Well EW-3 as a Percent of Cleanup Goals

Figure 5L Contaminant Concentrations in Well EW-9 as a Percent of Cleanup Goals

Figure 5M Contaminant Concentrations in Well EW-13 as a Percent of Cleanup Goals

Figure 5N Contaminant Concentrations in Well EW-13A as a Percent of Cleanup Goals

Figure 5O Contaminant Concentrations in Well EW-14 as a Percent of Cleanup Goals

Figure 6A 1,1,1-TCE Concentrations as a Percent of Cleanup Goal

MNH|F:\USER\SHARE\KEARSARGE ESD DOCS\46949\TOC.DOC 6 OCTOBER 2003 iv

LIST OF FIGURES (continued)

Title

Figure 6B 1,1-DCE Concentrations as a Percent of Cleanup Goal

Figure 6C-1 1,1-DCA Concentrations as a Percent of Cleanup Goal for MW-114, MW-203,

MW-205, MW-211, MW-213, EW-13, EW-13A

Figure 6C-2 1,1-DCA Concentrations as a Percent of Cleanup Goal for CDM-1, EW-9,

EW-14, MW-4, MW-7, EW-01, EW-02, EW-03

Figure 6D 1,2-DEC Concentrations as a Percent of Cleanup Goal

Figure 6E TCE Concentrations as a Percent of Cleanup Goal

Figure 7A 1,1,1-TCA Concentration in Well MW-7

Figure 7B 1,1-DCE Concentration in Well MWS-203 and MWS-205

Figure 7C 1,1-DCE Concentration in Well EW-14

Figure 7D 1,1-DCA Concentration in Well MWS-203, MWS-211, and MWS-114

Figure 7E 1,1-DCA Concentration in Well MW-4, CDM-1, and EW-14

Figure 7F TCE Concentration in Wells MWS-211 and MWS-213

Figure 7G 1,1-DCA Concentration in Well MW-114 and CDM-1

Figure 7H Contaminant Concentrations in Well CDM-1 as a Percent of Cleanup Goals

Figure 8 Total Target VOCs

Figure 9 Vertical Profile Investigation Total VOC Concentration Contours at Top of Silt

Layer

Figure 10 Geoprobe Core Investigation Contours of Maximum Detected Total VOC

Concentration in each Boring

MNH|F:\USER\SHARE\KEARSARGE ESD DOCS\46949\TOC.DOC 6 OCTOBER 2003 v

LIST OF TABLES

Title Page

Table 1-1 Groundwater Clean-up Goals ........................................................................... 1-1

Table 2-1 Influent and Effluent 2002 Analytical Data for Selected Compounds ............... 2-3

Table 3-1 Summary of Major Maintenance Items and Modifications................................ 3-2

Table 3-2 Routine Maintenance Items.............................................................................. 3-4

Table 4-1 2002 Monitoring Program Summary ................................................................ 4-3

Table 4-2 2002 Groundwater Data ................................................................................... 4-4

Table 4-3 Metals Data August 2002................................................................................. 4-6

MNH|F:\USER\SHARE\KEARSARGE ESD DOCS\46949\LIST OF ACRONYM1.DOC 6 OCTOBER 2003 vi

LIST OF ACRONYMS

µg/L micrograms per liter 1,1,1-TCA 1,1,1-trichloroethane

1,1-DCA 1,1-dichloroethane 1,1-DCE 1,1-dichloroethene

1,2-DCA 1,2-dichloroethane AGWQS Ambient Groundwater Quality Standard

bgs below ground surface EPA U.S. Environmental Protection Agency

ft feet GC gas chromatography

gpm gallons per minute GWTP Groundwater Treatment Plant

hp horsepower KMC Kearsarge Metallurgical Corporation

mg/L milligrams per liter MTBE Methyl t-butyl ether NHDES New Hampshire Department of Environmental Services

O&M Operations and Maintenance QC Quality Control

RCMP Risk Characterization and Management Policy ROD Record of Decision

Site Kearsarge Metallurgical Corporation Superfund Site TCE Trichloroethylene

VOCs volatile organic compounds WESTONSM Weston Solutions, Inc.

SECTION 1

INTRODUCTION

F:\USER\SHARE\KEARSARGE ESD DOCS\46949\02RPTR_FNL.DOC 1-1 10/6/2003

1. INTRODUCTION

This 2002 Operations and Maintenance (O&M) Report presents the performance and results of

groundwater treatment at the Kearsarge Metallurgical Corporation (KMC) Superfund Site (Site)

from 1 January 2002 through 31 December 2002. The report includes a discussion of the

performance, maintenance, and modifications of the groundwater extraction and treatment

system, as well as recommendations to improve the performance of the system.

The Site is located in Conway, New Hampshire. A site plan is presented as Figure 1. Kearsarge

Metallurgical Corporation manufactured precision stainless steel castings at the site from 1964

to 1982. Wastes such as spent ceramic casting sands and molds, metal grindings, scrap metal, and

rusted steel drums were disposed in a waste pile located to the east of the facility buildings. The

waste pile was removed in October 1992. Waste solvents, such as 1,1,1-trichloroethane (1,1,1-

TCA), were also disposed in a septic tank/leach field located adjacent to the waste pile. These

waste disposal practices resulted in contamination of the site groundwater. Contaminants of

concern at the Site and associated groundwater clean-up levels are listed in Table 1-1.

Table 1-1

Groundwater Clean-up Goals

Contaminant of Concern Clean-up Goal (µg/l)

Chloroform 100

Chromium (dissolved) 50

1,1-Dichloroethane 4

1,2-Dichloroethane 5

1,1-Dichloroethene 7

Nickel (dissolved) 700

Trichloroethene 5

1,1,1-Trichloroethane 200

Operation of the groundwater remediation system at the Site began in October 1993.

Weston Solutions, Inc. (WESTONSM) has operated the system since August 1995. A discussion


of treatment system components, performance, routine and non-routine maintenance, and

modifications during 2002 is provided in Sections 2 and 3. The results of the 2002 groundwater

sampling and analysis are presented in Section 4. Additional investigations conducted during 2002

to evaluate a potential continuing source of contamination are discussed in Section 5. Section 6 is

the updated Historical Groundwater Database. Conclusions and recommendations for

modifications to the remediation system at the Site are contained in Section 7.

SECTION 2

GROUNDWATER EXTRACTION AND TREATMENT SYSTEM


2. GROUNDWATER EXTRACTION AND TREATMENT SYSTEM

A process flow diagram of the groundwater remediation system at the Site is presented as

Figure 2. The system at the Site consists of the following treatment processes:

! Groundwater extraction from three extraction wells (EW-01, EW-02, and EW-03) located west of the Groundwater Treatment Plant (GWTP) known as Hobbs Street wells, and nine extraction wells (EW-5 through EW-9 and EW-11 through EW-12, EW-13A, and EW-14) located southeast of the GWTP (Culvert Area wells). Extraction well EW-13A is associated with a groundwater collection trench installed in 2000 located in the vicinity of the Culvert Area wells. The well locations are shown on Figure 1.

! Equalization (T-1).

! Metals removal processes, including clarification and filtration. (T-2, FC-1, T-3, SF-1, SF-2, T-5).

! Organics removal, including air stripping with treatment of the stripper off-gas via vapor phase carbon. (AS-1, OTS-1, OTS-2).

! Sludge Storage (ST-1).

! Discharge of the plant effluent to the sanitary sewer (T-4).

Two additional extraction wells, EW-04 (Hobbs Street) and EW-10 (Culvert Area), were

formerly used to extract groundwater for the treatment system. These two wells were off-line in

2002. Extraction wells EW-04 and EW-10 were sampled in 2002, and the groundwater

contaminant concentrations in the vicinity of these wells were below clean-up goals. Culvert Area

well EW-13 was replaced with collection trench extraction well EW-13A in October 2000 and

now functions as a monitoring well.

2.1 SUMMARY OF VOLUMES PROCESSED

The design pumping rate of the groundwater extraction wells at the Site is approximately

42 gallons per minute (gpm), with 40 gpm extracted from the Hobbs Street wells and 1 to 2 gpm

extracted from the Culvert Area wells. During 2002, the Hobbs Street extraction well (EW-01,

EW-02, and EW-03) pumps were operated in a pulsed mode. The pulsed mode was tested


beginning in January 2002. The pulsed mode, consisting of operating the well pumps for four days

and shutting off the well pumps for 3 days, began in April 2002.

The actual GWTP flow rates and monthly volumes treated from January 2002 through

December 2002 are presented in Figure 3. During this time, the GWTP average monthly flow rate

ranged from 22.1 gpm to 42.7 gpm, with an average of approximately 34 gpm and an average

treatment volume of approximately 1,122,800 gallons per month (approximate annual treated

volume of 13,473, 500 gallons).

In August 2002, the GWTP was shut down for 10 days (8/14/02 � 8/23/02) during non-duty

hours to prevent equipment damage due to a malfunction at Control Panel No. 1. In

September 2002, the GWTP was shut down for four days while the process piping was being

replaced. A discussion of the Year 2002 maintenance and modification activities is included in

Section 3 of this report.

2.2 INFLUENT/EFFLUENT QUALITY

Influent concentrations of 1,1-dichloroethane (1,1-DCA), 1,2-dichloroethane (1,2-DCA),

1,1,1-TCA, and 1,1-dichloroethene (1,1-DCE) historically have been above clean-up goals in the

Culvert Area extraction wells and below clean-up goals in the influent from the Hobbs Street

extraction wells. Between 2000 and 2002, the influent concentrations of 1,2-DCA and

Trichloroethylene (TCE) were consistently below the clean-up goals of 5 micrograms per

liter (µg/L) in the Culvert Area extraction wells. Influent concentrations for 1,1-DCA, 1,1-DCE,

and 1,1,1-TCA continued to exceed clean-up goals in the Culvert Area extraction wells. Influent

concentrations of selected volatile organic compounds (VOCs) for the year 2002 are presented in

Table 2-1.

Historically, TCE has been observed primarily in the Hobbs Street wells. However, the VOC

concentrations in the Hobbs Street extraction wells have remained below the TCE clean-up goal

in 1999, 2000, 2001, and 2002. The remaining VOC constituents were also below the clean-up

goal in the Hobbs Street extraction wells for 2002. However, concentrations of TCE in

monitoring well MW-211 [approximately 25 feet (ft) east of extraction well EW-01] continue to

exceed the cleanup goal.

Table 2-1Influent and Effluent 2002 Analytical Data for Selected Compounds

Kearsarge Metallurgical Corporation Superfund Site

Chemicals DetectedUnits

Cleanup Criteria

Location Well ID DateHobb Street EW01-EW03 23-Jan-02 2 U 2 U 1 U 2 U 2 U 190 25 U 470 40 U 5 U 10 U

Wells EW01-EW03 Pre-Batch 27-Mar-02 2 U 2 U 1 U 2 2 U NS NS NS NS NS NSEW01-EW03 Post-Batch 27-Mar-02 2 U 2 U 1 U 2 U 2 U NS NS NS NS NS NSEW01-EW03 Pre-Batch 5-Apr-02 2 U 2 U 1 U 2.5 2 U NS NS NS NS NS NSEW01-EW03 Post-Batch 5-Apr-02 2 U 2 U 1 U 2 U 2 U NS NS NS NS NS NSEW01-EW03 Pre-Batch 10-Apr-02 2 U 2 U 1 U 2 U 2 U NS NS NS NS NS NSEW01-EW03 Post-Batch 10-Apr-02 2 U 2 U 1 U 2.2 2 U NS NS NS NS NS NSEW01-EW03 Pre-Batch 15-Apr-02 2 U 2 U 1 U 2 U 2 U NS NS NS NS NS NSEW01-EW03 Post-Batch 15-Apr-02 2 U 2 U 1 U 2 U 2 U NS NS NS NS NS NSEW01-EW03 Pre-Batch 22-Apr-02 2 U 2 U 1 U 2 U 2 U NS NS NS NS NS NSEW01-EW03 Post-Batch 19-Apr-02 2 U 2 U 1 U 2 U 2 U NS NS NS NS NS NSEW01-EW03 Post-Batch 3-May-02 2 U 2 U 1 U 2 U 2 U NS NS NS NS NS NSEW01-EW03 Pre-Batch 6-May-02 2 U 2 U 1 U 2 U 2 U NS NS NS NS NS NSEW01-EW03 Post-Batch 10-May-02 2 U 2 U 1 U 2 U 2 U NS NS NS NS NS NSEW01-EW03 Pre-Batch 13-May-02 2 U 2 U 1 U 2 U 2 U NS NS NS NS NS NSEW01-EW03 Post-Batch 17-May-02 2 U 2 U 1 U 2 U 2 U NS NS NS NS NS NSEW01-EW03 Pre-Batch 20-May-02 2 U 2 U 1 U 2 U 2 U NS NS NS NS NS NSEW01-EW03 Post-Batch 24-May-02 2 U 2 U 1 U 2 U 2 U NS NS NS NS NS NSEW01-EW03 Pre-Batch 28-May-02 2 U 2 U 1 U 2 U 2 U NS NS NS NS NS NSEW01-EW03 Post-Batch 31-May-02 2 U 2 U 1 U 2 U 2 U NS NS NS NS NS NSEW01-EW03 Pre-Batch 3-Jun-02 2 U 2 U 1 U 2 U 2 U NS NS NS NS NS NSEW01-EW03 Post-Batch 7-Jun-02 2 U 2 U 1 U 2 U 2 U NS NS NS NS NS NSEW01-EW03 Pre-Batch 10-Jun-02 2 U 2 U 1 U 2 U 2 U NS NS NS NS NS NSEW01-EW03 Post-Batch 14-Jun-02 2 U 2 U 1 U 2 U 2.2 NS NS NS NS NS NSEW01-EW03 Pre-Batch 17-Jun-02 2 U 2 U 1 U 2 U 2 U NS NS NS NS NS NSEW01-EW03 Post-Batch 21-Jun-02 2 U 2 U 1 U 2 U 2.2 NS NS NS NS NS NSEW01-EW03 Post-Batch 24-Jun-02 2 U 2 U 1 U 2 U 2.2 NS NS NS NS NS NSEW01 Post-Batch 5-Jul-02 2 U 2 U 1 U 2 U 2 U NS NS NS NS NS NSEW01 Pre-Batch 8-Jul-02 2 U 2 U 1 U 2 U 2 U NS NS NS NS NS NSEW01 Post-Batch 12-Jul-02 2 U 2 U 1 U 2.3 2 U NS NS NS NS NS NSEW01 Pre-Batch 15-Jul-02 2 U 2 U 1 U 2.2 2 U NS NS NS NS NS NSEW01-EW03 Post-Batch 19-Jul-02 2 U 2 U 1 U 2 U 2 U NS NS NS NS NS NSEW01-EW03 Pre-Batch 22-Jul-02 2 U 2 U 1 U 2 U 2 U NS NS NS NS NS NSEW01 Pre-Batch 25-Jul-02 2 U 2 U 1 U 2.5 2 U NS NS NS NS NS NSEW01 Post-Batch 29-Jul-02 2 U 2 U 1 U 2.6 2 U NS NS NS NS NS NSEW01 Post batch 2-Aug-02 2 U 2.7 1 U 2.6 2.2 NS NS NS NS NS NSEW01 Pre-batch 5-Aug-02 2 U 2 U 1 U 2 U 2 U NS NS NS NS NS NSEW01 Post batch 9-Aug-02 2 U 2 U 1 U 2 U 2 U NS NS NS NS NS NSEW01 Pre-batch 12-Aug-02 2 U 2 U 1 U 2 U 2 U NS NS NS NS NS NSEW01 Post batch 16-Aug-02 2 U 2 U 1 U 2 U 2 U NS NS NS NS NS NSEW01 Pre-batch 19-Aug-02 2 U 2 U 1 U 2 U 2 U NS NS NS NS NS NSEW01 Pre-batch 26-Aug-02 2 U 2 U 1 U 2 U 2 U NS NS NS NS NS NS

Chemicals DetectedCulvert Wells EW5-EW9 & EW11-EW14 23-Jan-02 66 2 U 42 420 2 U 4100 25 U 56000 40 U 5 U 10 U

GWTP Effluent Date23-Jan-02 2 U 2 U 1 U 2 U 2 U 120 25 U 100 U 40 U 5 U 10 U27-Feb-02 2 U 2 U 1 U 2 U 2 U 52 25 U 100 U 40 U 5 U 10 U27-Mar-02 2 U 2 U 1 U 2 U 2 U 55 25 U 100 U 40 U 5 U 10 U5-Apr-02 2 U 2 U 1 U 2 U 2 U 54 25 U 100 U 40 U 5 U 10 U

10-Apr-02 2 U 2 U 1 U 2 U 2 U 71 25 U 100 U 40 U 5 U 10 U6-May-02 2 U 2 U 1 U 2 U 2 U 66 25 U 100 U 40 U 5 U 10 U19-Jun-02 2 U 2 U 1 U 2 U 2 U 170 25 U 100 U 40 U 5 U 10 U15-Jul-02 2 U 2 U 1 U 2 U 2 U NS NS NS NS NS NS

22-Aug-02 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 18 25 U 100 U 40 U 5 U 10 U12-Sep-02 2 U 2 U 1 U 2 U 2 U NS NS NS NS NS NS29-Oct-02 2 U 2 U 1 U 2 U 2 U 5000 72 650 40 U 5 U 10 U12-Nov-02 2 U 2 U 1 U 2 U 2 U 130 25 U 100 U 40 U 5 U 10 U10-Dec-02 2 U 2 U 1 U 2 U 2 U 64 25 U 100 U 40 U 5 U 10 U

U = Quantitation LimitNS = Not Sampled

* = Chemical analyses performed by EPA using an on-site GC.NR = Not Recorded in this report

Pre-Batch = Sample collected after wells shutdown for 2 to 3 days.Post Batch = Sample collected after wells had been pumping for 4 days.

Manganese Nickelµg/L700

Copper Ironµg/L

-µg/L

-

TCEµg/L µg/L µg/L µg/L µg/L

1,1 DCA 1,2-DCA

Effluent

Influent Influent

1,1 DCA 1,2-DCA 1,1,-DCE 1,1,1-TCA TCE

-4 5 7 200

Chromium1,1,-DCE 1,1,1-TCA

5µg/L

50

Leadµg/L

-µg/L

MNH\projects\01395022\008\annlrpt\final\TABLE2_1 2-3 10/6/2003


Methyl t-butyl ether (MTBE), a contaminant not detected at the Site previous to 1998, was

observed in GWTP effluent samples on four occasions between May 1998 and October 1998.

Methyl t-butyl ether was detected at a concentration of 2.8 µg/L in an effluent sample collected in

June 2002 and 1.4 µg/L in an effluent sample collected in August 2002. The New Hampshire

Department of Environmental Services (NHDES) Ambient Groundwater Quality Standard

(AGWQS) for MTBE is 13 µg/L; none of the effluent sampling exceeded this regulatory limit for

MTBE.

Analytical data from the monitoring wells at the Site provide additional information regarding

groundwater contaminant distribution. A discussion of contaminant concentrations in the Site�s

monitoring wells is presented in Section 4.

2.3 UNIT PROCESS PERFORMANCE

2.3.1 Hobbs Street Wells

Historically extraction wells EW-01 EW-02, and EW-03 have performed reliably, with flow rates

averaging 40 gpm for all three wells combined. During 2002, pulsed operation of the

Hobbs Street wells was performed to clean up potential residual contamination in the vadose zone

in the Hobbs Street area. Beginning in January 2002, the Hobbs Street wells were operated in a

pulsed mode. During the pulsed mode, all three wells were simultaneously shut down for a period

of 2 to 3 days, followed by continuous pumping for a period of 3 days. The Hobbs Street pumps

were operated in this on/off cycling mode from January through September of 2002.

During the shut down period, groundwater elevations in the Hobbs Street area were allowed to

return to static (non-pumping) levels. This allowed any residual contamination in the normally

unsaturated soils (under pumping conditions) to come in contact with the groundwater.

If residual contamination existed in these soils, the raising and lowering of the groundwater

caused by the pulse operation mode would provide a flushing action to remove the residual

contamination from the normally unsaturated soils. To evaluate whether contamination was being

removed from the vadose zone, influent samples were collected after the 4-day pumping period,

prior to the shut down of the wells (post-batch samples), and again after conclusion of the 2- to 3-


day shutdown period (pre-batch samples). Table 2-1 summarizes the analytical data for the pre-

and post-batch samples. The pre- and post-batch samples were collected until

August 2002 even though batching of the Hobbs Street wells continued for the entire year.

Beginning in July and August 2002, pre- and post-batch sampling was conducted on extraction

well EW-01 only to determine if elevated concentrations of VOCs were being diluted by the

influent from extraction wells EW-02 and EW-03. The analytical results from the EW-01 batch

samples were also below the clean-up criteria for the VOCs analyzed. In September, the pre- and

post- batch sampling was discontinued for all extraction wells. Analytical results from the

pre- and post-batch samples were continuously below cleanup criteria.

The extraction well pumps are typically removed one to two times per year for cleaning

(primarily/removal of iron bacteria and precipitated metals) and maintenance. In 2002, the

Hobbs Street extraction well pumps were removed for cleaning and maintenance in March and

November. In March, extraction well EW-03 pump motor and relay were replaced. In May 2002,

the pump motor was replaced in extraction well EW-01. Due to a decline in extraction well

efficiency, TDS (a WESTON Subcontractor) redeveloped extraction wells EW-01 and EW-03 in

November 2002.

2.3.2 Culvert Area Wells

The Culvert Area wells performed well during the 2002 reporting period, but because of the low

conductivity soils in the Culvert Area, they have much lower yields (2-3 gpm combined) than the

Hobbs Street wells (40 gpm combined). However, the highest groundwater contaminant

concentrations are in the Culvert Area and thus the Culvert Area wells provide substantial

contaminant removal. Two of the extraction wells (EW-4 and EW-10) attained the clean-up goals

and were shut down in November 1995 and April 1996, respectively. The aboveground piping to

EW-10 has been removed.

The pumps in the Culvert Area wells are pneumatically driven because of the low yields of these

wells. The pneumatic well pumps have performed reliably and, like the Hobbs Street well pumps,

require periodic removal and cleaning. In February 2002, Culvert Area extraction well pump EW-

13A was removed and cleaned. In July, pumps in extraction wells EW-05 through EW-09 were


removed and cleaned. In August, extraction wells EW-11 through EW-14 were removed and

cleaned.

Extraction well EW-13A continues to extract an average of 1 gpm from the Culvert Area,

doubling the total rate of groundwater extraction within the Culvert Area from approximately

1 to 2 gpm, prior to installation of the EW-13A, to 2 to 3 gpm currently. In 2002, EW-13A had

the highest recorded flow rate of the Culvert Area extraction wells.

In February 2002, the cycle counter in extraction well EW-11 was replaced. In March 2002, a

discharge pipeline from pump head EW-13 to the well head was repaired.

2.3.3 Groundwater Collection Trench and Associated Extraction Well

The groundwater collection trench is 120 ft long, 4 ft wide, and slopes from approximately 9.5 ft

below ground surface (bgs) at each end to approximately 10.5 ft deep at the center, where the

new extraction well EW-13A is located. There is a one-foot-thick layer of washed, crushed stone

installed along the full-length of the trench bottom. The crushed stone layer provides a

high-permeability zone to facilitate flow of groundwater to EW-13A. A geotextile filter fabric

overlays the crushed stone layer. The objective of the filter fabric is to minimize downward

migration of fine soil particles into the crushed stone layer, and thereby maintain the permeability

of that layer. The bottom of the trench is located at the top of the low-permeability silt-clay layer,

9.5 to 10.5 ft bgs. The location of the groundwater collection trench is shown on Figure 1.

As mentioned in Subsection 2.3.2, the flow rate within extraction well EW-13A had the highest

recorded flow rate of the Culvert Area extraction wells, indicating the continued successful

performance of the groundwater collection trench. The trench is centered across the axis of a

concentrated portion of the contaminant plume and appears to be intercepting the plume as it

flows in an easterly direction.

2.3.4 Equalization and Metals Removal System

The components of this system are the equalization and pH adjustment tank (T-1), flash mix tank

(T-2), clarifier (FC-1), transfer tank (T-3), deep-bed sand filters (SF-1 and SF-2), and associated


process and chemical feed pumps. The low concentration of metals in the treatment plant influent

required minimal active metals removal during 2002. Minimal settling of iron and other suspended

solids occurred in the clarifier. One of the two sand filters is operated continuously with the

second filter on standby. The operating sand filter is backwashed weekly. The backwash water

from the sand filters and the small amount of solids that settle in the clarifier are pumped to the

sludge holding tank (ST-1). The average thickness of settled sludge in the bottom of the sludge

holding tank was approximately 14 inches during 2002.

Due to the deterioration of the process piping and mineral deposits within the pipeline, continual

cleaning, flushing, and repairing of the pipeline was conducted to decrease head losses in the

piping within the treatment plant. In September 2002, the process piping was replaced by

Federal Piping Company to improve the overall operation of the treatment plant.

2.3.5 Organic Contaminants Removal System

The organic contaminants removal system consists of the air stripper (AS-1) and the vapor phase

activated carbon adsorption units (OTS-1 and OTS-2). This system has performed efficiently,

removing organic contaminants from the process water to below discharge criteria since GWTP

startup. A 2-horsepower (hp) air stripper blower draws outside air in through the tank ventilation

system and processes it through the air stripper. This blower is also used in the carbon system to

process the air stripper exhaust through two carbon vessels in series prior to discharge to the

atmosphere.

Toward the end of 2002, an increase in pressure loss in the airflow through air stripper has been

observed. This may be the result of a buildup of mineral deposits, such as iron and manganese, on

the air stripper packing material. Because the Hobbs Street wells were operated in a pulsed mode

during 2002 rather than the previous continuous mode, the average water quality was largely

influenced by the water quality of the Culvert Area, which contained higher concentrations of iron

and manganese. Therefore, it seems likely that the increase in pressure losses across the air

stripper is caused by mineral deposits that resulted from the altered influent water quality from the

pulsed pumping regime.


The last carbon change out was conducted in October 1996. Total VOC concentration

measurements are taken at the discharges from the first and second carbon vessels on a monthly

basis with a photoionization detector. The readings collected at the discharge of the first vessel

periodically detected low concentrations of VOCs (0.1 parts per million) in 2002. As a preventive

maintenance measure, it is recommended that the first carbon vessel be removed and replaced by

the second carbon vessel. The spare carbon vessel, currently being stored on-site, will become the

new second carbon vessel. The readings collected after the second carbon vessel continue to be at

or below background levels, indicating that the carbon has not been exhausted in the second

vessel and that VOCs stripped from the groundwater are not passing through the carbon. The air

stream at the intake and discharge of each activated carbon filter is measured monthly for VOC

concentrations.

SECTION 3

TREATMENT SYSTEM MAINTENANCE AND MODIFICATIONS


3. TREATMENT SYSTEM MAINTENANCE AND MODIFICATIONS

A summary of major maintenance items and modifications to the GWTP from January 2002

through December 2002 is presented in Table 3-1. The significant maintenance and modification

activities in 2002 included:

! Replace inoperable cycle counter at extraction well EW-11.

! Replace pump motor, thermal overload and relay in extraction well EW-03.

! Install new digital indicator for equalization tank level at CP-2.

! Repair leaking line and valve at extraction wells EW-05 and EW-07.

! Install upgraded process, fire, and security alarm system.

! Replace discharge pipeline from EW-13 pump head to well head.

! Replace extraction well pump motor for EW-01.

! Install vault cover over extraction well EW-01.

! Replace oxygen sensor and battery cell in combustible gas analyzer.

! Repair air stripper tower weather cap.

! Replace leaking process piping in GWTP.

! Redevelop Hobbs Street wells EW-01, EW-02, and EW-03.

! Repair hoses and replace a gasket in AC-1.

! Repair air stripper tower cap sheathing.

! Pulling of pumps in Hobbs Street and Culvert Area wells for cleaning, service, and maintenance.

In September 2002, the process piping was replaced by Federal Piping Company to improve the

overall operation of the treatment plant. Federal Piping Company replaced the effluent piping

from T-1 pumps to the flash mix tank, and the effluent piping from the filter supply pumps to the

effluent sand filter beds.

Table 3-1Summary of Major Maintenance Items and Modifications


Date Item Maintenance/Modification

14-Jan-02 Process piping Air/Water scour process piping, maintenance to avoid clogging24-Jan-02 Process piping Air/Water scour process piping, maintenance to avoid clogging25-Jan-02 Equalization tank Inspect T-1 tank interior for condition, and tank level probe accuracy4-Feb-02 Alarm System Pope security on site to review alarm installation8-Feb-02 EW-11 Cycle counter at EW-11 inoperable, replaced with new unit21-Feb-02 Culvert area Pulled pump at EW-13A was inoperable - cleaned pump 25-Feb-02 Heatless air dryer Replaced pre and post coalescing filters at heatless air dryer12-Mar-02 EW-13 Repaired 5/8 inch discharge pipeline from pump head to well head.13-Mar-02 Digital indicator Troubleshoot 710D digital indicator with loop C39simulator. 710D unit-non-operational - returned for repair.18-Mar-02 Flow meter Schedule maintencance and cleaning of paddle wheel flow meter.20-Mar-02 EW-1,2,3 Maintenance/cleaning of well pumps.20-Mar-02 EW-3 pump EW-3 pump burned out.20-Mar-02 EW-1,2,3 Replaced check valves at EW-1,2,3 pump installations.25-Mar-02 CP-1 Hoffman electrician replaced burned out relay, pump motor, wire lead.26-Mar-02 CP-1 EW-3 relay burned out again 27-Mar-02 Well survey Conduct well elevation survey 28-Mar-02 EW-3 pump Grundfos electrician onsite pulled pump EW-3 and replaced motor and relay.1-Apr-02 Digital indicator Troubleshoot 710D digital indicator. Sent back to Mfg as warranty item.4-Apr-02 Digital indicator Install and set up new 710D digital indicator.4-Apr-02 873 pH Analyzer Specify and order a new pH sensor probe to T-1 tank.5-Apr-02 CGI Found CGI inoperable. Ordered a new 02 sensor.

16-Apr-02 CGI Replaced faulty 02 sensor in CGI.25-Apr-02 EW-5 and EW-7 Repaired damaged and leaking line and fittings in well head.26-Apr-02 Air Compressor Top off synthetic lubricant at air compressor #1.4-May-02 System Process T-1 tank full alarm, ran batch 11-May-02 System Process T-1 tank full alarm, ran batch 15-May-02 EW-1 EW-1 tripped check with amp probe15-May-01 710D Digital indicator Set alarm limits for T-4 effluent tank16-May-02 Security System Pope Security onsite to install upgraded system, answering service16-May-02 PLC Changed set point for pumps EW-5 and EW-1417-May-02 Security System Pope Security onsite to install upgraded system, answering service21-May-02 EW-1 pump motor Whitelaw Electric onsite, pulled pump, replaced bad motor.

G:\projects\01395022\008\annlrpt\final\TBL3_1\O&M 3-2 10/6/2003

Table 3-1Summary of Major Maintenance Items and Modifications


Date Item Maintenance/Modification

24-Jun-02 Carbon Filters Air sampling for hydrocarbon detection, to determine carbon saturation27-Jun-02 Boring rods Bring boring equipment to machine shop to repair threads.9-Jul-02 Pneumatic wells Pulled pumps at EW-5 and EW-6 for preventative maintenance/cleaning

11-Jul-02 CGI CGI inoperable. Ordered new 02 sensor and battery cell as required.16-Jul-02 Pneumatic wells Pulled pumps at EW-7, 8, 9 for preventative maintenance/cleaning22-Jul-02 Carbon Exhaust blower Low air pre-alarm; removed condensation4-Aug-02 System process Reset air system5-Aug-02 EW-1 Throttle EW-1's pump discharge to eliminate pump cavatation.8-Aug-02 Extraction well pumps Pull pumps and conduct cleaning and preventive maintenance (Ext. wells 13 and 14).9-Aug-02 Extraction well pumps Pull pumps and conduct cleaning and preventive maintenance (Ext. wells 11 and 12).

14-Aug-02 CP-1 Found control problem with CP-1 (on-operational)15-Aug-02 pH probe pH Probe inoperable, reconfigure local control in process area.22-Aug-02 CP-1 Electrician onsite to install fuse block, & 3 min alarm shutdown delay module.23-Aug-02 CP-1 Malfunction at CP-1 caused by process shutdown, pulled 3 hour process alarm shutdown module.3-Sep-02 System process Discontinue process batch, Hobbs Pulsing, and batch sampling.3-Sep-02 System Effluent Granite Staet Analytical performed quarterly compliance sampling.18-Sep-02 ASTU Lift service onsite to facilitate ASTU cap sheathing repair.20-Sep-02 Process piping Federal Piping onsite to prefab pipe for shutdown.23-Sep-02 Process piping Federal Piping onsite to dismantle sand filter manifolds and applicable piping.25-Sep-02 P15, P16 flow meter Clean P15/P16 manifold assembly and magnetic flow meter.28-Sep-02 VFD Reset variable speed drive, 32.5 to 31 gpm due to T-1 low condition.3-Oct-02 Facility sump Solenoid failed at T-3, manually pumped down sump.

15-Oct-02 EW-1 and EW-3 Shut down wells, dose w/ LBA to prep for redevelopment of wells.17-Oct-02 EW-1 and EW-3 TDS onsite to redevelop wells - method unsuccessful.17-Oct-02 EW-1 and EW-3 Turned well pumps on - throttle EW-1 to 12 gpm.30-Oct-02 EW-1 and EW-3 TDS back onsite to redevelop wells. Shutdown EW-1 and EW-3 does with LBA31-Oct-02 EW-1 and EW-3 Turned EW-1 and EW-3 well pumps on.31-Oct-02 AC-1 Air Services Co. onsite to repair hoses and replace gasket on AC-1.13-Nov-02 EW-02 Pulled and serviced extraction well pump.11-Dec-02 Culvert Area Isolate extraction wells EW-5 & EW-11, blow out line. Off-line for the season.

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Although not part of the groundwater remediation facility, the old KMC building is located

adjacent to the treatment plant building. Over the past few years this building has undergone

significant deterioration. A safety inspection conducted by WESTON in 2001 indicated that this

building is no longer structurally stable and portions are in danger of collapse. No trespassing

signs have been posted to prevent the public from entering the building and fencing the perimeter

of the building is planned for 2003.

The maintenance and modification activities listed in Table 3-1 were performed on an as-needed

basis. Additional maintenance activities are routinely conducted at the Site weekly, monthly,

tri-annually, or annually. A summary of ongoing maintenance items and the frequency at which

they are conducted is presented in Table 3-2.

Table 3-2

Routine Maintenance Items

Frequency Task

Weekly Inspection of Culvert Area well pumps and recording of pump cycle totalizer readings

Weekly Collection of grab samples throughout the treatment process for pH and iron testing

Weekly Cleaning and calibration of T-1 pH probe

Monthly Equipment rotation (pumps, blowers, etc.)

Monthly Collection of effluent samples and delivery to the AMRO Laboratory

Every 5000 hours of operation Air compressor oil and air filter replacement

Every 4 Months Removal, dismantling, and cleaning of extraction well pumps

Quarterly Lubrication of pumps, motors, mixers, blowers

Quarterly Cleaning of paddle wheel influent flow meter

Quarterly Collection of influent samples and delivery to the AMRO Environmental Laboratory

As needed seasonally Outside maintenance including snow blowing, and mowing of grass and weeds around plant and wells

Annual Clarifier tank cleaning and residual sludge removal

Annual Removal and cleaning of P-30 (building sump pump)

Annual Replacement of belts on exhaust blower

Annual Inspection of interior of sand filters and leveling of media


Frequency Task

As Needed Replacement of activated carbon in vapor phase carbon units

SECTION 4

GROUNDWATER SAMPLING AND ANALYSIS


4. GROUNDWATER SAMPLING AND ANALYSIS

Groundwater sampling and analysis is conducted at the Site to evaluate performance of the

groundwater extraction system and to monitor progress towards attainment of clean-up goals.

Groundwater monitoring at the Site is conducted according to the Long-Term Monitoring Plan

for the Site as described in Subsections 4.1 and 4.2.

4.1 LONG-TERM MONITORING

A Long-Term Monitoring Plan for monitoring performance of the groundwater remediation

system was developed and submitted to NHDES in July 1996. The objectives of the monitoring

plan are as follows:

! Provide data to evaluate performance of the groundwater extraction system.

! Provide data that can be used to forecast if and when the groundwater extraction system will reduce groundwater contamination to acceptable levels.

! Provide data that can be used to justify and document alternative actions in the event that groundwater extraction proves to be technically impracticable.

The monitoring plan recommended:

! A list of selected wells at the Site to be monitored.

! Specific analytes that are indicators of overall groundwater contamination at the Site.

! Sampling frequency.

! Statistical methods for analyzing the resulting groundwater data.

The monitoring plan recommended tri-annual monitoring of five analytes (1,1-DCA, 1,1,1-TCA,

TCE, 1,2-DCA, and 1,1-DCE) in 13 wells (CDM-1, EW-01, EW-02, EW-03, EW-09, EW-14,

MW-4, MW-7, MWS-114, MWS-203, MWS-205, MWS-211, and MWS-213). Graphs of

contaminant concentrations versus time were recommended for analysis of trends in contaminant

concentrations.


Three groundwater sampling rounds were conducted in 2002. During 2002, groundwater samples

were collected on April 3, 4, and 5, August 5, 6 and 7, and December 2, 3, and 4. Additional

sample locations not included in the original monitoring plan were sampled in 2002. In August,

the monitoring program was expanded to include a comprehensive sampling event with additional

wells that formerly contained concentrations less than the clean-up goals. This extensive

monitoring program included 39 wells. Table 4-1 summarizes the wells sampled during each 2002

sample event.

The groundwater samples were analyzed for VOCs via U.S. Environmental Protection Agency

(EPA) Method SW-8260. Laboratory analyses of the wells sampled in 2002 are summarized in

Table 4-2. Figure 4 shows the total VOC concentrations in the monitoring and extraction wells

from 1995 to 2002.

During the August 2002 sampling round, groundwater samples collected from MW-4, MW-7,

MW-8, MW-9, MW-11, MW-112, MW-114, MW-115, MW-203, MWS-205, MW-206,

MW-211, MW-213, MW-215, EW-01, and CDM-1 were analyzed for iron, manganese,

chromium, and nickel using EPA Method 200. Table 4-3 summarizes the metals data from this

sampling round. Concentrations of both chromium and nickel were below the clean-up goals in all

samples. Concentrations of iron up to 37.9 milligrams per liter (mg/L) and manganese up to

7.79 mg/L were observed in several Culvert Area wells, indicating that Culvert Area water would

likely require pretreatment if not diluted by water from the Hobbs Street extraction wells.

4.2 GROUNDWATER SAMPLING RESULTS

The historical groundwater monitoring data (VOC data only) for selected monitoring wells are

presented graphically in Figures 5A through 5O, 6A through 6E, and 7A through 7G. Because of

the wide range of contaminant concentrations displayed, Figures 5A through 5O and 6A through

6E are displayed in a semi-logarithmic format.

Figures 5A through 5O show the contaminant concentrations in each well as a percent of the

contaminant�s clean-up goal, and thus allow for evaluation of clean-up goal exceedances on a

well-specific basis.


Table 4-1 2002 Monitoring Program Summary

Well Identification

Original Monitoring Plan

April Sample Event

August Sample Event

December Sample Event

EW-01 X X X XEW-02 X X X XEW-03 X X X XEW-05 X X EW-06 X X XEW-07 X X EW-08 X X XEW-09 X X X XEW-10 X EW-11 X X EW-12 X X XEW-13 X X

EW-13A X X XEW-14 X X X XCDM1 X X X XMW-01 X XMW-04 X X X XMW-07 X X X XMW-08 X MW-09 X MW-10 X MW-11 X MW-12 X

MW-104 X MW-105 X MW-112 X MW-113 X MW-114 X X X XMW-115 X MW-116 X MW-201 X MW-202 X MW-203 X X X XMW-204 X MW-205 X X X XMW-206 X MW-211 X X X XMW-213 X X X XMW-215 X


Well Identification

Original Monitoring Plan

April Sample Event

August Sample Event

December Sample Event

MW-216 X

Table 4-22002 Groundwater Monitoring Data


Well Date

CDM1 03-Apr-02 2 U 2 U 2 U 2 U 2 UCDM1 06-Aug-02 2 U 3.9 2 U 2 U 2 UCDM1 04-Dec-02 2 U 3.9 2 U 2 U 2 UEW01 03-Apr-02 2.5 2 U 2 U 2 U 2 UEW01 05-Aug-02 2 U 2 U 2 U 2 U 2 UEW01 04-Dec-02 2 U 2 U 2 U 2 U 2 UEW02 03-Apr-02 2 U 2 U 2 U 2 U 2 UEW02 05-Aug-02 2 U 2 U 2 U 2 U 2 UEW02 04-Dec-02 2 U 2 U 2 U 2 U 2 UEW03 03-Apr-02 2.7 2 U 2 U 2 U 2 UEW03 05-Aug-02 2.3 2 U 2 U 2 U 2 UEW03 04-Dec-02 2.3 2 U 2 U 2 U 2 UEW05 03-Apr-02 2 U 2.8 2 U 2 U 2 UEW05 05-Aug-02 2 U 49 8.8 2 U 2 UEW06 03-Apr-02 2 U 3.1 2 U 2 U 2 UEW06 05-Aug-02 3.5 49 9.5 2 U 2 UEW06 03-Dec-02 2 U 2 U 2 U 2 U 2 UEW07 03-Apr-02 3.7 6.1 2 U 2 U 2 UEW07 05-Aug-02 2.2 4.2 2 U 2 U 2 UEW08 03-Apr-02 5 2 U 2 U 2 U 2 UEW08 05-Aug-02 10 5.5 3.6 2 U 2 UEW08 03-Dec-02 5.8 5 2 U 2 U 2 UEW09 03-Apr-02 11 2 U 2.4 2 U 2 UEW09 05-Aug-02 2 U 2 U 2 U 2 U 2 UEW09 03-Dec-02 12 2 U 3.1 2 U 2 UEW10 06-Aug-02 3.6 2 U 2 U 2 U 2 UEW11 03-Apr-02 7.3 9.8 2 U 2 U 2 UEW11 05-Aug-02 2 U 2 U 2 U 2 U 2 UEW12 03-Apr-02 2.9 38 2.8 2 U 2 UEW12 05-Aug-02 2 30 2.1 2 U 2 UEW12 03-Dec-02 3.5 26 3.6 2 U 2 UEW13 03-Apr-02 16000 350 1200 2 U 2 UEW13 05-Aug-02 12000 570 1000 200 U 200 U

EW13A 03-Apr-02 550 26 37 2 U 2 UEW13A 05-Aug-02 520 39 35 2 U 2 UEW13A 03-Dec-02 400 32 31 2 U 2 UEW14 03-Apr-02 85 2.3 18 2 U 2 UEW14 05-Aug-02 60 2 U 11 2 U 2 UEW14 03-Dec-02 310 9.2 58 2 U 2 UMW1 03-Apr-02 74 4.3 5.2 2 U 2 UMW1 03-Dec-02 2 U 2 U 2 U 2 U 2 U

MW10 07-Aug-02 2 U 2 U 2 U 2 U 2 UMW104 07-Aug-02 2 U 2 U 2 U 2 U 2 UMW105 07-Aug-02 2 U 2 U 2 U 2 U 2 UMW11 05-Aug-02 2 U 2.7 2 U 2 U 2 UMW112 05-Aug-02 2 U 2 U 2 U 2 U 2 UMW113 06-Aug-02 2 U 2 U 2 U 2 U 2 UMW114 03-Apr-02 2 U 2 U 2 U 2 U 2 U

Cleanup Goal

1,1,1-TCA

200 557

1,1-DCA

4

1,2-DCA1,1-DCE TCE

FSMNH01\PROJECTS\01395022\008\ANNLRPT\final\TBL4_2\2002 4-4 10/6/2003

Table 4-22002 Groundwater Monitoring Data


Well Date

Cleanup Goal

1,1,1-TCA

200 557

1,1-DCA

4

1,2-DCA1,1-DCE TCE

MW114 05-Aug-02 6.2 20 3.2 2 U 2 UMW114 03-Dec-02 2 U 9.6 2 U 2 U 2 UMW115 05-Aug-02 2.6 3 2 U 2 U 2 UMW116 07-Aug-02 2 U 2 U 2 U 2 U 2 UMW12 07-Aug-02 2 U 2 U 2 U 2 U 2 U

MW12-Dup 07-Aug-02 2 U 2 U 2 U 2 U 2 UMW201 06-Aug-02 2 U 2 U 2 U 2 U 2 UMW202 07-Aug-02 2 U 230 73 2 U 2 UMW203 03-Apr-02 3.4 27 3.4 2 U 2 UMW203 05-Aug-02 78 36 16 2 U 2 UMW203 03-Dec-02 7.5 21 4.4 2 U 2 U

MW203-Dup 05-Aug-02 78 35 16 2 U 2 UMW204 06-Aug-02 2 U 2 U 2 U 2 U 2 UMW205 03-Apr-02 21 2 U 5.9 2 U 2 UMW205 05-Aug-02 18 2 U 4.7 2 U 2 UMW205 03-Dec-02 19 2 U 5.2 2 U 2 U

MW205-Dup 03-Apr-02 21 2 U 6 2 U 2 UMW205-Dup 05-Aug-02 18 2 U 4.7 2 U 2 UMW205-Dup 03-Dec-02 17 2 U 4.7 2 U 2 U

MW206 06-Aug-02 2 U 2 U 2 U 2 U 2 UMW211 05-Apr-02 2 U 3.8 2 U 2 U 29MW211 06-Aug-02 2 U 2.6 2 U 2 U 16MW211 04-Dec-02 2 U 2.8 2 U 2 U 26MW213 05-Apr-02 2 U 2 U 2 U 2 U 2 UMW213 06-Aug-02 2 U 2 U 2 U 2 U 2 UMW213 04-Dec-02 2 U 2 U 2 U 2 U 2 U

MW213-Dup 04-Dec-02 2 U 2 U 2 U 2 U 2 UMW215 06-Aug-02 2 U 2 U 2 U 2 U 2 UMW216 07-Aug-02 2 U 2 U 2 U 2 U 2 UMW4 03-Apr-02 2 U 2 U 2 U 2 U 2 UMW4 05-Aug-02 2 U 8.4 2 U 2 U 2 UMW4 03-Dec-02 2 U 2 U 2 U 2 U 2 UMW7 03-Apr-02 2 U 2 U 2 U 2 U 2 UMW7 05-Aug-02 2 U 2 U 2 U 2 U 2 UMW7 03-Dec-02 2 U 2 U 2 U 2 U 2 UMW8 06-Aug-02 3.1 2 U 2 U 2 U 2 UMW9 06-Aug-02 2 U 2 U 2 U 2 U 2 U

Notes: 1. Units are ug/l2. U = non-detect

FSMNH01\PROJECTS\01395022\008\ANNLRPT\final\TBL4_2\2002 4-5 10/6/2003

Table 4-3Metals Data August 2002


Monitoring Well Date Sampled Chromium Iron Manganese Nickel

Cleanup Goals - 0.05 - - 0.7CDM1 06-Aug-02 0.01 U 0.05 U 0.013 0.02 UEW-10 06-Aug-02 0.01 U 1.19 0.014 0.02 UMW-4 05-Aug-02 0.01 U 0.05 U 0.021 0.02 UMW-7 05-Aug-02 0.01 U 0.05 U 0.01 U 0.02 UMW-8 06-Aug-02 0.01 U 0.2925 0.018 0.02 UMW-9 06-Aug-02 0.01 U 0.05 U 0.01 U 0.02 UMW-10 07-Aug-02 0.01 U 0.073 0.016 0.02 UMW-11 05-Aug-02 0.01 U 0.05 U 0.042 0.02 UMW-12 07-Aug-02 0.01 U 1.4 1.04 0.064MW-104 07-Aug-02 0.05 U 25 3.4 0.1 UMW-105 07-Aug-02 0.01 U 310 20 0.02 UMW-112 05-Aug-02 0.01 U 0.064 0.01 U 0.02 UMW-113 06-Aug-02 0.01 U 0.117 0.038 0.02 UMW-114 05-Aug-02 0.01 U 5.23 4.25 0.02 UMW-115 05-Aug-02 0.01 U 0.05 U 0.042 0.02 UMW-116 07-Aug-02 0.05 U 11 4.3 0.1 UMW-201 06-Aug-02 0.01 U 0.37 6.7 0.023MW-202 07-Aug-02 0.05 U 22.5 2.24 0.1 UMW-203 05-Aug-02 0.01 U 37.9 7.79 0.02 UMW-204 06-Aug-02 0.01 U 0.05 U 0.182 0.02 UMW-205 05-Aug-02 0.01 U 0.083 6.68 0.02 UMW-206 06-Aug-02 0.01 U 0.133 0.075 0.02 UMW-211 06-Aug-02 0.01 U 0.076 0.047 0.02 UMW-213 06-Aug-02 0.01 U 0.167 0.095 0.02 UMW-215 06-Aug-02 0.01 U 0.05 U 0.01 U 0.02 UMW-216 07-Aug-02 0.01 U 0.973 0.594 0.02 U

Notes: 1. All units are mg/L2. U = Non-dectected

g:\projects\01395022\008\annl_rpt\TBL4-3\AnalyticalFilter_Crosstab 4-6 10/6/2003


Figures 5A through 5O also show that prior to startup of the remediation system, five of the wells

in the monitoring program had substantial exceedances of clean-up criteria.

Five wells (MW-213, EW-01, EW-02, EW-03, and EW-09) have consistently had no exceedances

of clean-up criteria for several years. Since 1996, well MW-07 has met clean-up goals for all

compounds with the exception of one sampling round in November 2000. This sampling round

was conducted shortly after installation of the groundwater collection trench.

Concentrations of 1,1-DCA have been oscillating with a downward trend in Well MW-04;

however, the concentrations were still above the clean-up goal for this compound in the August

sampling round. All other compounds measured in well MW-04 have been below the clean-up

goals for several years.

The constituent 1,1-DCA found in wells MW-114 and MW-203 has not shown a considerable

decrease in concentrations since startup of the GWTP. The concentrations of 1,1-DCA appear to

have stabilized above the clean-up goal of 4 µg/L. TCE concentrations in well MW-211 have also

appeared to stabilize above the clean-up goal of 5 µg/L.

Extraction well EW-13A is located in the center of the groundwater collection trench.

Concentrations of all five analytes in this well have been decreasing since the installation of the

trench in October 2000. The concentrations of constituents 1,1,1-TCA, 1,1-DCA and 1,1-DCE in

well EW-13A are the highest concentrations observed in any of the wells with the exception of

well EW-13, which is approximately 10 ft upgradient of well EW-13A. During the last sampling

round, concentrations of 1,1,1-TCA, 1,1-DCA, and 1,1-DCE in well EW-13 were more than an

order of magnitude greater than concentrations of the same constituents in well EW-13A.

The variation in concentrations between these two wells maybe the result of dilution of well

EW-13A concentrations with less contaminated groundwater collected from the north and south

ends of the trench.

In general, the concentration of contaminants in the Hobbs Street Area of the Site appear to have

been decreasing since the beginning of the GWTP operations in 1993. Four of the six

Hobbs Street wells (EW-1, EW-2, EW-3, and MWS-213) have consistently met the clean-up goal


for all contaminants from 1997 to the present. Hobbs Street well MWS-211 has achieved the

clean-up goal for all contaminants except TCE.

The Culvert Area wells have also seen a reduction in contaminant concentration since the

beginning of GWTP operation. Well EW-9, an outer tier well in the Culvert Area has achieved the

clean-up goals for all contaminants of concern from 1997 to the present. MW-7 another outer tier

well has achieved clean-up goals for all contaminants of concern from approximately 1996 to

August 2000. Concentrations of 1,1-DCE and 1,1,1-TCA were detected slightly above the

clean-up goals during November 2000 sampling event in well MW-7. However, the results from

the August and December 2002 sampling events indicated that concentrations have since dropped

below the clean-up goals for all compounds. An exceedance of the 1,1-DCA cleanup goal was

observed in the third outer tier well in the Culvert Area (MW-4) during the

August 2002 sampling event. An exceedance of the 1,1-DCA cleanup goal was also observed in

the fourth outer tier well (MW-114) during the August 2002 sample event.

Figures 6A through 6E allow evaluation of contaminant distribution on an analyte-specific basis

by plotting a specific analyte as a percent of clean-up goals for each of the wells graphed. These

figures show that the five analytes evaluated as part of the long-term monitoring program had

substantial exceedances in several wells prior to, or shortly after, startup of the treatment system.

After four years of treatment system operation these exceedances were reduced both in number

and in magnitude for four of these analytes (1,1,1-TCA, 1,1-DCE, 1,2- DCA, and TCE).

Constituent 1,2-DCA was consistently below the clean-up goal from 1999 through 2002 in all the

wells included in the original monitoring program (See Figure 6D).

Samples from twelve wells exceeded the clean-up goals for 1,1-DCA in 2002 including EW-05,

EW-06, EW-07, EW-08, EW-11, EW-12, EW-13, EW-13A, EW-14, MW-4, MW-114, and

MW-203. The compound 1,1-DCA is a breakdown product of 1,1,1-TCA. This may explain the

lesser rate of attenuation of 1,1-DCA when compared to the other chlorinated compounds. Wells

EW-13, EW-13A and EW-14 also exceeded the clean-up goal for 1,1,1-TCA during the 2002

sample events.


The aforementioned exceedances for 1,1,-DCA are based on the clean-up goal for 1,1-DCA that

was established in the Record of Decision (ROD) (4 µg/L). At the time the ROD was established,

a federal or state maximum contaminant level had not been established for 1,1-DCA, however in

1996 the NHDES Risk Characterization and Management Policy (RCMP) GW-1 Standard (GW-

1)of 81 µg/L was established. If the 2002 analytical results for the monitoring wells are compared

to the GW-1 standard for 1,1-DCA, only EW-13 and MW 202 would exceed.

Figures 7A through 7G present contaminant concentrations in selected wells on a linear scale and

thus provide additional detail on specific contaminant concentrations and trends in each of the

wells. Figures 7A and 7F have shown a definite downward trend in contaminant concentrations at

the Site since the inception of the groundwater remediation system. However, a stabilizing trend

within particular wells has been more apparent in recent years as shown in Figures 7B, 7D, 7E,

and 7G. Figure 7B shows a general downward trend of 1,1-DCE in monitoring wells

MWS-203 and MWS-205 since the startup of the GWTP. However, the concentrations of

1,1-DCE appear to be stabilizing near the clean-up goal of 7 µg/L. Figure 7D indicates the

concentrations of 1,1-DCA have stabilized in well MWS-203 above the clean-up goal of 4 µg/L

between 1999 and 2002. Figure 7E indicates a stabilization of analyte 1,1-DCA in monitoring well

MW-4. Figure 7G also indicates a stabilizing trend of 1,1-DCA above the clean-up goal in wells

MW-114 and CDM-1. This stabilizing trend of analytes indicates a potential source may be

present on-site that continues to release contaminants to groundwater. Concentrations of

1,1-DCE and 1,1-DCA are continually detected at concentrations exceeding clean-up goals

Figures 7C, 7D, and 7E.

Approximately 49.5% of the contaminant mass in the Culvert Area has been removed via pump

and treat in during the nine years of operation, but 36.6% of the mass was removed during the

first year of operation. An average of less than 2% of the original total mass has been removed per

year for each of the last eight years. At a removal rate of 2% per year of continued operation,

approximately 50 more years would be required to meet cleanup goals.

Following each sample round, Figures 5A through 50, 6A through 6E, and 7A through 7G are

updated to allow ongoing evaluation of the contaminated groundwater remedial action at the Site.


Although data from extraction wells EW-05, EW-06, EW-07, EW-08, EW-11, and EW-12 are

not plotted, these wells were sampled during the three sampling events in 2002. The analytical

results of all wells sampled in 2002 are reported in Table 4-2.

A summary of historical groundwater monitoring data is provided in Figure 4. Total VOC

concentrations for each of the wells sampled since 1995 is provided for each well location

sampled.

Groundwater samples collected during the August 2002 sampling round were analyzed for metals.

Concentrations of chromium and nickel were below cleanup goals in all samples collected during

this sampling round.

SECTION 5

ADDITIONAL INVESTIGATIONS


5. ADDITIONAL INVESTIGATIONS

As discussed in the previous section, the concentrations of several chlorinated compounds have

stabilized above cleanup goals in many of the Culvert Area wells. This is an indication that a

continuing source of contamination may be present at the Site. Additional site investigations were

conducted in 2002 to evaluate potential source areas at the Site that may be contributing to

continued contamination of the groundwater.

5.1 PASSIVE SOIL GAS SURVEY

An active soil gas survey initially conducted by EPA in 1999 on the KMC property indicated

elevated levels of 1,1-TCA in vapor along the southwest portion of the KMC building.

In April 2002, a passive soil gas survey, using Gore-Sorber soil gas modules, was conducted to

further investigate potential source areas at the Site. The Gore-Sorber modules utilize a ePTFE

membrane to provide a gas permeable, waterproof layer of protection for the adsorbent media,

which might otherwise come in contact with liquid water or soil particles. The use of engineered

sorbents helps to minimize the water vapor uptake rate on the adsorbent media.

On April 15 and 16, 2002, 50 Gore-Sorber soil gas modules were installed approximately 3 ft bgs

in various locations on a grid laid out across the Site. The Gore-Sorbers were left in place for

approximately 15-16 days. On April 30, 2002, all the Gore-Sorber probes were retrieved and sent

to W.L. Gore & Associates for analyses. The soil gas samples were analyzed for target VOCs

using modified EPA Method 8260. The passive soil gas survey detected concentrations of VOCs

along the northern portion of the KMC building extending to the east of the building. Figure 8

depicts the results of the total VOC analyses of the Gore-Sorber probes. The complete results are

available in the Gore-Sorber Soil Screening Final Report dated May 21, 2002.

5.2 VERTICAL PROFILING INVESTIGATION

Based on previous site investigations and historical analytical results, a modified Waterloo Profiler

(Profiler) was used to collect groundwater samples in areas suspected to be potential sources of

contamination at the Site. The Profiler was able to provide limited vertical profile information of


the soil stratigraphy, based on hydraulic conductivity and other physical parameters. The Profiler

also facilitated collection of groundwater samples at multiple depths at 23 locations during the

weeks of June 24 and July 1, 2002. Groundwater samples were collected at 5-ft depth intervals at

depths ranging from 10 to 50 ft bgs. The groundwater samples were analyzed for VOCs, specific

conductance, pH, dissolved oxygen, and oxidation-reduction potential. Volatile organic

compound analyses were performed using EPA Method 8260/8260B by the on-site EPA mobile

laboratory using a transportable gas chromatography (GC).

Ten percent (10%) of field samples were sent to the EPA fixed laboratory in Chelmsford, MA for

Quality Control (QC) verification of VOC analyses.

Vertical profiling was used to evaluate changes in contaminant concentrations with depth by

collecting samples at discrete intervals. In addition, using a tool called KPRO attached to the

Profiler tip, a real-time index of hydraulic conductivity was utilized to identify changes in

stratigraphy with depth and to select the optimum depths for sample collection.

Vertical profiling results were utilized to identify source areas and to target specific areas and

depths for additional site investigations. The vertical profiling results identified a VOC source area

between the Culvert Area wells and the old KMC building. The highest VOC concentrations were

observed at the top of a low permeability layer encountered at a depth of approximately 8 ft bgs,

approximately 30 ft southwest of EW-13A. Figure 9 depicts contours of total VOCs

concentrations at the top of the low permeability layer. Groundwater concentrations observed in

monitoring wells were used to extend the contours beyond the immediate vertical profiling study

area. Complete results from the vertical profiling study are available in the Vertical Profiling

Letter Report prepared by WESTON, dated 16 August 2002.

5.3 SOIL SAMPLE INVESTIGATION USING GEOPROBE

Based on the information obtained during the vertical profiling activities and previous site

activities, soil samples were collected to target the identified source areas at the Site and further

define the vertical extent of VOC contamination within the low permeability layer. During the

week of November 12, 2002, a total of 20 borings were completed using truck-mounted

hydraulic-drive/percussion hammer equipment (Geoprobe®). Soil cores were collected in


transparent acetate sleeves, so that changes in stratigraphy could be observed. Soil samples were

collected from the cores and analyzed for VOCs by the on-site EPA mobile laboratory using a

transportable GC. Ten percent of field samples were sent off-site for QC verification of VOC

analyses.

The initial borings were drilled within the area identified as a potential source area during the

vertical profiling investigation. Subsequent borings were located by moving outward in concentric

circles around the initial borings in an effort to delineate the vertical and lateral extent of the

source area. The borings ranged in depth from approximately 16 to 20 ft. Results of the

on-site GC analysis allowed field decisions to be based on real-time data.

Soil cores were collected from each boring location, and selected soil samples from each boring

were analyzed on-site for VOCs using EPA Method 5035A/8260 by the on-site EPA mobile

laboratory. Eleven soil samples were sent to ESS Laboratory for analysis of fraction organic

carbon. One soil sample was collected for Toxicity Characteristic Leaching Procedure analysis for

metals, VOCs, and semi-volatile organic compounds to determine disposal characteristics of the

soil within the source area. Maximum VOC concentrations detected at each of the Geoprobe®

boring locations are shown on Figure 10. Complete results are available in the Geoprobe Coring

Letter Report prepared by WESTON, dated 17 December 2002.

The Geoprobe® investigation further defined the vertical and lateral extent of the source area

identified during the vertical profiling activities. The information from the Geoprobe® work was

used to estimate volumes of soil that would constitute a �source� and could therefore be

remediated or removed to expedite achievement of cleanup goals by pump and treat.

5.4 AQUITARD (CONFINING) LAYER

Evaluation of the vertical profiling investigation, the Geoprobe investigation, and historic boring

logs of wells installed at the Site confirm the existence of a confining grey silt aquitard located

beneath the site. The top of the aquitard appears to exist at depths varying from 12 to 16 ft bgs in

the Culvert Area extending to depths approximately 45 ft bgs in the Hobbs Street Area. A tan


clayey silt layer, approximately 2 to 4 ft thick, was observed to overlie the grey silt aquitard in the

Culvert Area.

During the Geoprobe® investigation, soil samples were collected an average of every 2 ft within

the tan clayey silt layer and the grey silt aquitard to determine the depth of penetration of VOCs in

the source area soils at the Site. Based on chemical analyses of the soil samples, the highest

concentrations of VOCs (greater than 1 milligram per kilogram total VOCs) in the Culvert Area

were encountered from approximately 1 ft above the top of the tan clayey silt layer, through the

full depth of the tan clayey silt, and approximately 2 ft into the grey silt aquitard. Therefore, the

majority of the highly concentrated contaminant mass is located in these two layers of low

permeability soils at depths from 7 to 14 ft bgs.

SECTION 6

HISTORICAL GROUNDWATER DATABASE


6. HISTORICAL GROUNDWATER DATABASE

WESTON has entered all available groundwater analytical data, including monitoring wells,

extraction wells, well points, and catch basins, into an Access database. The soil gas, vertical

profiling groundwater, and geoprobe soil data have not been entered into the database.

A compact disc containing the database with data collected prior to and including

December 2002 is included with this report. The database can be used to conduct queries on the

data to focus on data of particular interest, such as specific wells, contaminants, or sampling

dates. Where contaminant concentrations exceed the established clean-up goals, the

concentrations are presented in red.

SECTION 7

CONCLUSIONS AND RECOMMENDATIONS


7. CONCLUSIONS AND RECOMMENDATIONS

7.1 CONCLUSIONS

On the western portion of the Site (Hobbs Street Area), it appears that the extraction wells have

continually been very effective in reducing groundwater contamination levels. Groundwater

samples from all of the operating extraction wells (EW-1, EW-2, and EW-3) have contaminant

concentrations below the clean-up goals. However, samples collected from monitoring well

MWS-211 continue to exceed the clean-up goals for TCE.

Although wells in the Hobbs Street Area have continued to show improvement

(VOC concentrations are now below cleanup goals in all but one monitoring well in the

Hobbs Street Area), VOC concentrations in many of the Culvert Area wells have not decreased

significantly since approximately 1997. In well EW-13, groundwater concentrations of the

primary contaminant, 1,1,1-TCA, are more than two orders of magnitude higher than the cleanup

goal 200 µg/L.

The highest groundwater contaminant concentrations observed during the last few years were

located in the Culvert Area in the vicinity of extraction wells EW-8, EW-12, EW-13, and EW-14

and most recently in EW-13A. The contaminant plume appears to be centralized northeast of the

former waste pile and migrating toward the north and east. A passive soil gas survey, vertical

profiling of groundwater concentrations, and soil sample collection using a Geoprobe drill rig

were conducted in 2001 and 2002. These investigations were focused in the Culvert Area where

the highest groundwater concentrations were consistently observed.

Results of the investigations clearly indicated a concentrated source of chlorinated organic

solvents in the Culvert Area of the Site. The vertical and horizontal extent of this source was

delineated, and options for removal or treatment of the source material were evaluated. The

majority of the contaminant mass was observed to be present in the saturated zone in low

permeability soils (silt and clayey silt with hydraulic conductivities on the order of 10-6 centimeter

per second) at a depth of 7 to 14 ft bgs. In situ chemical oxidation or stimulated biodegradation of

the VOCs is not considered feasible because of the high concentrations of VOCs and the difficulty


associated with distributing amendments in the low permeability soils. The presence of the

chlorinated solvent source in the low permeability soils also means that attainment of cleanup

goals by pump and treat will not be achieved for decades unless other measures are taken to

remove the source. Because of the relatively shallow depth of the source materials, excavation

and off-site disposal will most likely be the most cost-effective approach for expedited removal of

the contaminant mass. More details on the rationale for excavation and off-site disposal of the

source area soils is presented in the Draft Source Removal Justification Memo prepared by

WESTON and dated 7 February 2003.

7.2 RECOMMENDATIONS

It appears unlikely that groundwater clean-up goals will be attained in the Culvert Area within the

next two years without implementing additional remedial measures. Although groundwater

contaminant concentrations have decreased overall at this site, and the plume has decreased in

aerial extent, there continues to be clean-up goal exceedances in multiple wells in the

Culvert Area during each sampling round. The following recommendations are intended to

expedite attainment of cleanup goals in the Culvert Area groundwater, minimize long-term O&M

costs, the following, and keep the treatment plant functioning efficiently throughout the remainder

of its operating life:

1. It is recommended that source area soils with total VOC concentrations greater than 6 mg/kg be excavated and disposed off-site. As discussed in the Draft Source Removal Justification Memo, the current rate of contaminant mass removal via pump and treat is estimated at 2% per year. At this rate, cleanup goals are not likely to be achieved in under 50 years. Removal of soils with VOC concentrations greater than 6 mg/kg will reduce the contaminant mass by 68% and would significantly reduce the length of time required to achieve cleanup goals by pump and treat.

2. It is recommended that a new groundwater extraction trench be installed within the excavated area. The bottom of the trench excavation should be filled with approximately 5 ft of crushed stone. One extraction well should be installed within the trench and piped into the groundwater treatment plant. The new extraction well would eliminate the need for the existing culvert extraction wells. Extraction wells in the culvert area that are not disturbed during the remedial effort should be left for groundwater monitoring.


3. It is recommended that an Explanation of Significant Differences be written changing the existing clean-up goal for 1,1-DCA from 4 µg/L to the NHDES RCMP GW-1 Standard of 81 µg/L.

4. It is recommended that the first carbon vessel be replaced with the second carbon vessel. The spare carbon vessel, currently being stored on-site, should become the new second carbon vessel. The spent carbon from the first vessel should be sent off-site for disposal for regeneration.

5. It is recommended that the packing in the air stripper be acid washed or replaced. The increased loss in pressure across the air stripper is indicative of clogging due to mineral deposits in the Jaeger Tripack packing material.

6. It is recommended that the sludge tank contents be sampled and analyzed for disposal characterization. Supernatant liquid from the sludge tank should be pumped into Tank T-1 and the sludge should be disposed of appropriately off-site.

7. It is recommended that the Hobbs Street wells (EW-1, EW-2, and EW-3) continue to operate since MW-211 continues to exceed the clean-up goal for TCE. The additional water from these wells will lower the average iron and manganese concentrations of the treatment plant influent, thus minimizing operational problems related to high metals concentrations.

8. It is recommended that the deposits be removed from the influent piping between the Hobbs Street wells and the treatment plant by jet cleaning to allow adequate flow from these wells to the plant.

9. The use passive vapor-diffusion samplers should be considered to collect the tri-annual groundwater samples. The sampling should be conducted in accordance with the Guidance on the Use of Passive Vapor-Diffusion Samplers to Detect Volatile Organic Compounds in Groundwater-Discharge Areas and Example Applications in New England, by Chuch, Vroblesky, Lyford and Willey, dated 2002.

10. It is recommended that a chain link fence should be installed around the former KMC building to restrict access to the building by the general public. Results of a safety evaluation conducted by WESTON in 2001 indicated that the walls and roofing of portions of the building were structurally unstable and in danger of collapse.

FIGURES

M:\Design\DWG\KRSARGE\NEW-FIG1.DWG, Model, 09/05/2003 02:20:25 PM, halle, 1:100

EW-06

WP-15

MW-1

LEGEND

EXTRACTION WELL BOX(GROUNDWATER ELEVATION)

EXISTING WELL POINT

MONITORING WELL(GROUNDWATER ELEVATION)

MWS-205^ PROPOSED LONG-TERMEW-09 m MONITORING LOCATION

PROPERTY BOUNDARY

YIELD HOUSEINDUSTRIES,

INC.

Ponded Excavation(Former Landfill)

GRAPHIC SCALE

50 150

100

7 In. = 100 ft

PEQUAWKETPOND

NHDESKMC SUPERFUND SITECONWAY, NEW HAMPSHIRE

OPERATIONS SITE PLAN

MAR 2003 | FIGURE 1

FIGURE 2PROCESS FLOW DIAGRAM

GROUNDWATER REMEDIATION FACILITYKMC SUPERFUND SITE

CONWAY, NEW HAMPSHIRE

DISCHARGETO AIR

HOBBS STREETWELLS (3)

CULVERTAREA

WELLS (9)

EQUALIZATIONTANK

(5,700 GALLON)

FLASHMIX TANK

CLARIFIERTANK

(9,000 GALLON) TRANSFERTANK

ProcessWater

DEEP-BEDSAND

FILTERS(2)

CARBONADSORPTION

UNITS(2)

T-2

POLYMERADDITION

FC-1L

IDHM

L

PRECIPITATION

Sludge

RECYCLETANK

(3,500 GALLON)

SLUDGEHOLDING

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PLANTEFFLUENTTO SEWER

EFFLUENTHOLDING

TANK(20,000 GALLON)

45

40 --

a.w

Rat

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low

H

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35

30

25

20 --

15 --

Figure 3GWTP Average Monthly Flow Rate - Treated

Kearsarge Metallurgical Corporation Superfund Site, 2002 Operations Report

•h-—- 1

-- — 5 avg. flow

10

Jan-02 Feb-02 Mar-02 Apr-02 May-02 Jun-02 Jul-02 Aug-02 Sep-02 Oct-02 Nov-02 Dec-02

Date

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NOTES:1. TOTAL CHLORINATED SOLVENT VALUES ARE THESUMMATION OF DETECTED RESULTS FOR THEFOLLOWING COMPOUNDS : CHLOROFORM,1,1-DICHLOROETHANE, 1,2-DICHLOROETHANE,1,1-DICHLOROETHENE, 1,1,1-TRICHLOROETHANE ANDTRICHLOROETHENE.

2. DUPLICATES IN BOLD.

3. SAMPLES WITH ASTERISK (*) INDICATE SAMPLESANALYZED ON-SITE BY PORTABLE GC.

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en

1

DATE08/01/9512/02/998/07/02

TOT CHL SOLV2.3

ND*ND

25'±WELLMW-201

DATE08/01/9512/07/998/06/02

TOT CHL SOLVND

ND*ND

WELLEW-05

DATE12/08/9903/27/0008/15/0011/29/005/17/018/01/0112/04/0104/03/028/05/02

TOT CHL SOLV11.7*

15.86.742.8ND59

65.52.8

58.7

WELLsurfacewater, endof culvert

DEPTH

N/A

TOT CHL SOLV

5.2

WELLMW-4

DATE08/01/9508/07/9612/03/9604/18/9708/27/9712/10/9703/30/9808/18/9803/30/9908/16/9912/13/9912/14/9903/27/0008/15/0011/29/008/01/0112/04/0104/03/028/05/0212/03/02

TOT CHL SOLV268

52.33317

42.923.7

7.256.2

4.843.5

6.10.65*

2.54.3ND

23.15.1ND8.4ND

NO. DATE APPR. REVISION NO. DATE APPR. REVISION

NHDESKMC SUPERFUND SITE


MANCHESTER =» NEW HAMPSHIRE

CHECKED

DES. ENG.

PROJ. ENG.

PROJ. MGR.

APPROVED

APPROVED

DATE CLIENT APPROVALS DATE

ISSUED FOR DATE

NEW HAMPSHIREDEPARTMENT OF

nvironmental. Services

HISTORICAL WELL DATATOTAL CHLORINATED SOLVENTS (ug/L)

1995 THROUGH 2002DRAWN

J.T.SCALE

AS SHOWN

DATE

FEBRUARY 2003W.O. NO.

01395-022-008

DWG. NO.

FIG-4REV. NO

SHT._ - O F .

FSMNH01\PROJECTS\01395022\008\DATABASE\KMSANLY1(MW-4) 10/6/2003

Figure 5AContaminant Concentrations in Well MW-4 as a Percent of Cleanup Goals


0

1

10

100

1,000

10,000

100,000

1,000,000

Jan-83

Jan-84

Jan-85

Jan-86

Jan-87

Jan-88

Jan-89

Jan-90

Jan-91

Jan-92

Jan-93

Jan-94

Jan-95

Jan-96

Jan-97

Jan-98

Jan-99

Jan-00

Jan-01

Jan-02

Jan-03

Con

cent

ratio

n as

a P

erce

nt o

f Cle

anup

Goa

l

1,1-DCA1,1-DCA NDs1,2-DCA1,2-DCA NDs1,1-DCE1,1-DCE NDs1,1,1-TCA1,1,1-TCA NDsTCETCE NDs

100% of Cleanup Goal

Open marker indicates analyte was not detected above sample detection limit. Marker is plotted at 50% of sample detection limit (TYP.)

October 1993, Start- up of Remediation System

Cleanup Goals:1,1-DCA = 4 mg/l1,2-DCA = 5 mg/l1,1-DCE = 7 mg/l1,1,1-TCA = 200 mg/lTCE = 5 mg/l


Figure 5BContaminant Concentrations in Well MW-7 as a Percent of Cleanup Goals


0

1

10

100

1,000

10,000

100,000

1,000,000

Jan-83

Jan-84

Jan-85

Jan-86

Jan-87

Jan-88

Jan-89

Jan-90

Jan-91

Jan-92

Jan-93

Jan-94

Jan-95

Jan-96

Jan-97

Jan-98

Jan-99

Jan-00

Jan-01

Jan-02

Jan-03

Con

cent

ratio

n as

a P

erce

nt o

f Cle

anup

Goa

l




October 1993, Start- up of Remediation SystemCleanup Goals:1,1-DCA = 4 mg/l1,2-DCA = 5 mg/l1,1-DCE = 7 mg/l1,1,1-TCA = 200 mg/lTCE = 5 mg/l


Figure 5CContaminant Concentrations in Well MW-114 as a Percent of Cleanup Goals


0

1

10

100

1,000

10,000

100,000

1,000,000

Jan-83

Jan-84

Jan-85

Jan-86

Jan-87

Jan-88

Jan-89

Jan-90

Jan-91

Jan-92

Jan-93

Jan-94

Jan-95

Jan-96

Jan-97

Jan-98

Jan-99

Jan-00

Jan-01

Jan-02

Jan-03

Con

cent

ratio

n as

a P

erce

nt o

f Cle

anup

Goa

l




October 1993, Start- up of Remediation System Cleanup Goals:1,1-DCA = 4 mg/l1,2-DCA = 5 mg/l1,1-DCE = 7 mg/l1,1,1-TCA = 200 mg/lTCE = 5 mg/l


Figure 5DContaminant Concentrations in Well MW-203 as a Percent of Cleanup Goals


0

1

10

100

1,000

10,000

100,000

1,000,000

Jan-83

Jan-84

Jan-85

Jan-86

Jan-87

Jan-88

Jan-89

Jan-90

Jan-91

Jan-92

Jan-93

Jan-94

Jan-95

Jan-96

Jan-97

Jan-98

Jan-99

Jan-00

Jan-01

Jan-02

Jan-03

Con

cent

ratio

n as

a P

erce

nt o

f Cle

anup

Goa

l







Figure 5EContaminant Concentrations in Well MW-205 as a Percent of Cleanup Goals


0

1

10

100

1,000

10,000

100,000

1,000,000

Jan-83

Jan-84

Jan-85

Jan-86

Jan-87

Jan-88

Jan-89

Jan-90

Jan-91

Jan-92

Jan-93

Jan-94

Jan-95

Jan-96

Jan-97

Jan-98

Jan-99

Jan-00

Jan-01

Jan-02

Jan-03

Con

cent

ratio

n as

a P

erce

nt o

f Cle

anup

Goa

l







Figure 5FContaminant Concentrations in Well MW-211 as a Percent of Cleanup Goals


0

1

10

100

1,000

10,000

100,000

1,000,000

Jan-83

Jan-84

Jan-85

Jan-86

Jan-87

Jan-88

Jan-89

Jan-90

Jan-91

Jan-92

Jan-93

Jan-94

Jan-95

Jan-96

Jan-97

Jan-98

Jan-99

Jan-00

Jan-01

Jan-02

Jan-03

Con

cent

ratio

n as

a P

erce

nt o

f Cle

anup

Goa

l







Figure 5GContaminant Concentrations in Well MW-213 as a Percent of Cleanup Goals


0

1

10

100

1,000

10,000

100,000

1,000,000

Jan-83

Jan-84

Jan-85

Jan-86

Jan-87

Jan-88

Jan-89

Jan-90

Jan-91

Jan-92

Jan-93

Jan-94

Jan-95

Jan-96

Jan-97

Jan-98

Jan-99

Jan-00

Jan-01

Jan-02

Jan-03

Con

cent

ratio

n as

a P

erce

nt o

f Cle

anup

Goa

l






FSMNH01\PROJECTS\01395022\008\DATABASE\KMSANLY1(CDM-1) 10/6/2003

Figure 5HContaminant Concentrations in Well CDM-1 as a Percent of Cleanup Goals


0

1

10

100

1,000

10,000

100,000

1,000,000

Jan-83

Jan-84

Jan-85

Jan-86

Jan-87

Jan-88

Jan-89

Jan-90

Jan-91

Jan-92

Jan-93

Jan-94

Jan-95

Jan-96

Jan-97

Jan-98

Jan-99

Jan-00

Jan-01

Jan-02

Jan-03

Con

cent

ratio

n as

a P

erce

nt o

f Cle

anup

Goa

l






FSMNH01\PROJECTS\01395022\008\DATABASE\KMSANLY1(EW-1) 10/6/2003

Figure 5IContaminant Concentrations in Well EW-1 as a Percent of Cleanup Goals

Kearsarge Metallurgical Corparation Superfund Site

0

1

10

100

1,000

10,000

100,000

Oct-93 Oct-94 Oct-95 Oct-96 Oct-97 Oct-98 Oct-99 Oct-00 Oct-01 Oct-02 Oct-03

Con

cent

ratio

n as

a P

erce

nt o

f Cle

anup

Goa

l






Figure 5JContaminant Concentrations in Well EW-2 as a Percent of Cleanup Goals


0

1

10

100

1,000

10,000

100,000







Figure 5KContaminant Concentrations in Well EW-3 as a Percent of Cleanup Goals


0

1

10

100

1,000

10,000

100,000


Con

cent

ratio

n as

a P

erce

nt o

f Cle

anup

Goa

l






Figure 5LContaminant Concentrations in Well EW-9 as a Percent of Cleanup Goals


0

1

10

100

1,000

10,000

100,000


Con

cent

ratio

n as

a P

erce

nt o

f Cle

anup

Goa

l







Figure 5MContaminant Concentrations in Well EW-13 as a Percent of Cleanup Goals


0

1

10

100

1,000

10,000

100,000

Nov-00 Nov-01 Nov-02

Con

cent

ratio

n as

a P

erce

nt o

f Cle

anup

Goa

l




FSMNH01\PROJECTS\01395022\008\DATABASE\KMSANLY1(EW-13A) 10/6/2003

Figure 5NContaminant Concentrations in Well EW-13A as a Percent of Cleanup Goals


0

1

10

100

1,000

10,000

100,000

Nov-00 Nov-01 Nov-02

Con

cent

ratio

n as

a P

erce

nt o

f Cle

anup

Goa

l






Figure 5OContaminant Concentrations in Well EW-14 as a Percent of Cleanup Goals


0

1

10

100

1,000

10,000

100,000


Con

cent

ratio

n as

a P

erce

nt o

f Cle

anup

Goa

l





FSMNH01\PROJECTS\01395022\008\DATABASE\KMSANLY1(1,1,1-TCA) 10/6/2003

Figure 6A1,1,1-TCA Concentrations as a Percent of Cleanup Goal


0

1

10

100

1,000

10,000

100,000

1,000,000

Jan-83 Jan-84 Jan-85 Jan-86 Jan-87 Jan-88 Jan-89 Jan-90 Jan-91 Jan-92 Jan-93 Jan-94 Jan-95 Jan-96 Jan-97 Jan-98 Jan-99 Jan-00 Jan-01 Jan-02 Jan-03

Con

cent

ratio

n as

a P

erce

nt o

f Cle

anup

Goa

l

CDM-1EW-9EW-14MW-4MW-7MW-114MW-203MW-205MW-213MW-211EW-01EW-02EW-03EW-13EW-13A

October 1993, Startup of Remediation

100% of Cleanup Goal for 1,1,1-TCA (200 mg/L)

FSMNH01\PROJECTS\01395022\008\DATABASE\KMSANLY1(1,1-DCE) 10/6/2003

Figure 6B1,1-DCE Concentrations as a Percent of Cleanup GoalKearsarge Metallurgical Corporation Superfund Site

0

1

10

100

1,000

10,000

100,000

1,000,000


Con

cent

ratio

n as

a P

erce

nt o

f Cle

anup

Goa

l

CDM-1EW-9EW-14MW-4MW-7MW-114MW-203MW-205MW-211MW-213EW-01EW-02EW-03EW-13EW-13A

100% of Cleanup Goal for 1,1-DCE (7 µg/L)


`

FSMNH01\PROJECTS\01395022\008\DATABASE\KMSANLY1(1,1-DCA ) 10/6/2003

Figure 6C-11,1-DCA Concentrations as a Percent of Cleanup Goal

For MW-114, MW-203, MW-205, MW-211, MW-213, EW-13, EW-13AKearsarge Metallurgical Corporation Superfund Site

0

1

10

100

1,000

10,000

100,000

1,000,000


Con

cent

ratio

n as

a P

erce

nt o

f Cle

anup

Goa

l

MW-114

MW-203

MW-205

MW-211

MW-213

EW-13A

EW-13

100% of Cleanup Goal for 1,1-DCA (4 µg/L)

October 1993, Startup of Remediation System

FSMNH01\PROJECTS\01395022\008\DATABASE\KMSANLY1(1,1-DCA (2)) 10/6/2003

Figure 6C-21,1-DCA Concentrations as a Percent of Cleanup Goal

For CDM-1, EW-9, EW-14, MW-4, MW-7, EW-01, EW-02, EW-03Kearsarge Metallurgical Corporation Superfund Site

0

1

10

100

1,000

10,000

100,000

1,000,000


Con

cent

ratio

n as

a P

erce

nt o

f Cle

anup

Goa

l

CDM-1

EW-9

EW-14

MW-4

MW-7

EW-01

EW-02

EW-03


October 1993, Startup of Remediation System

FSMNH01\PROJECTS\01395022\008\DATABASE\KMSANLY1(1,2-DCA) 10/6/2003

Figure 6D1,2-DCA Concentrations as a Percent of Cleanup GoalKearsarge Metallurgical Corporation Superfund Site

0

1

10

100

1,000

10,000

100,000

1,000,000


Con

cent

ratio

n as

a P

erce

nt o

f Cle

anup

Goa

l

CDM-1MW-4MW-7MW-114MW-203MW-205MW-211MW-213EW-01EW-02EW-03EW-09EW-14EW-13EW-13A



FSMNH01\PROJECTS\01395022\008\DATABASE\KMSANLY1(TCE) 10/6/2003

Figure 6ETCE Concentrations as a Percent of Cleanup Goal


0

1

10

100

1,000

10,000

100,000

1,000,000


Con

cent

ratio

n as

a P

erce

nt o

f Cle

anup

Goa

l

CDM-1EW01EW02EW03MW-4MW-7MW-114MW-203MW-205MW-211MW-213EW-09EW-14EW-13EW-13A

100% of Cleanup Goal for TCE (5 µg/L)


FSMNH01\PROJECTS\01395022\008\DATABASE\KMSANLY1(111TCA in MW-7,EW14) 10/6/2003

Figure 7A1,1,1-TCA Concentration in Well MW-7


0

5,000

10,000

15,000

20,000

25,000

Jan-83

Jan-84

Jan-85

Jan-86

Jan-87

Jan-88

Jan-89

Jan-90

Jan-91

Jan-92

Jan-93

Jan-94

Jan-95

Jan-96

Jan-97

Jan-98

Jan-99

Jan-00

Jan-01

Jan-02

Jan-03

Con

cent

ratio

n of

1,1

,1-T

CA

in M

W-7

( µg/

L)

MW-7EW-14

Cleanup Goal for 1,1,1-TCA (200 µg/L)

October 1993, Startup of Groundwater Remediation System

FSMNH01\PROJECTS\01395022\008\DATABASE\KMSANLY1(11DCE in MWS203 & 205) 10/6/2003

Figure 7B1,1-DCE Concentration in Wells MWS-203 & MWS-205Kearsarge Metallurgical Corporation Superfund Site

0

50

100

150

200

250

300

350

400

Jul-92 Jul-93 Jul-94 Jul-95 Jul-96 Jul-97 Jul-98 Jul-99 Jul-00 Jul-01 Jul-02 Jul-03

Con

cent

ratio

n ( µ

g/L

)

MWS-203MWS-205

Cleanup Goal for 1,1-DCE (7 µg/L)


FSMNH01\PROJECTS\01395022\008\DATABASE\KMSANLY1(11DCE in EW-14) 10/6/2003

Figure 7C1,1-DCE Concentration in Well EW-14


0

100

200

300

400

500

600

700

800

900


Con

cent

ratio

n ( µ

g/L

)

EW-14

Cleanup Goal for 1,1-DCA (4 µg/L)


FSMNH01\PROJECTS\01395022\008\DATABASE\KMSANLY1(11DCA in MWS-203,211,114) 10/6/2003

Figure 7D1,1-DCA Concentration in Wells MWS-203, MWS-211, & MWS-114


0

100

200

300

400

500

600

700

800

900

Jan-92 Jan-93 Jan-94 Jan-95 Jan-96 Jan-97 Jan-98 Jan-99 Jan-00 Jan-01 Jan-02 Jan-03

Con

cent

ratio

n ( µ

g/L

)

MWS-203MWS-211MWS-114

Cleanup Goal for 1,1-DCA (4 µg/L)


FSMNH01\PROJECTS\01395022\008\DATABASE\KMSANLY1(11DCA in MW-4,EW14,CDM1) 10/6/2003

Figure 7E1,1-DCA Concentration in Well MW-4, CDM-1, EW-14Kearsarge Metallurgical Corporation Superfund Site

0

50

100

150

200

250

300

350

400

450

500

Jan-92 Jan-93 Jan-94 Jan-95 Jan-96 Jan-97 Jan-98 Jan-99 Jan-00 Jan-01 Jan-02 Jan-03

Con

cent

ratio

n ( µ

g/L

)

MW-4EW-14CDM-1

Cleanup Goal for 1,1,-DCA (4 µg/L)


FSMNH01\PROJECTS\01395022\008\DATABASE\KMSANLY1(TCE in MWS-211& 213) 10/6/2003

Figure 7FTCE Concentration in Wells MWS-211 & MWS-213


0

200

400

600

800

1,000

1,200

1,400

1,600


Con

cent

ratio

n ( µ

g/L

)

MWS-211MWS-213

Cleanup Goal for TCE (5 µg/L)


FSMNH01\PROJECTS\01395022\008\DATABASE\KMSANLY1(11DCA in MW-114&CDM1) 10/6/2003

Figure 7G1,1-DCA Concentration in Wells MW-114 & CDM-1


0

200

400

600

800

1,000

1,200

1,400

Jan-85 Jan-86 Jan-87 Jan-88 Jan-89 Jan-90 Jan-91 Jan-92 Jan-93 Jan-94 Jan-95 Jan-96 Jan-97 Jan-98 Jan-99 Jan-00 Jan-01 Jan-02 Jan-03

Con

cent

ratio

n ( µ

g/L

)

MW-114CDM-1

Cleanup Goal for 1,1,-DCA (4 µg/L)


t. now.L

•v H

Scale 1:1200S O 1 0 0 15C 3CQ L11-:

12.3593.Q&3

0.4970.361

0.1900.1370.1000.Q720.052

o.raa0,020

Total Target VOCa

GORE-SORBER^Screening Survey

W.L. GORE 4 ASSOCIATES, INCBOULEviKO

Hill i l i ff*i

Roy F, Weston, Inc., Manchester, NHKearsarge Metallurgical Corpri Conwayt NH

Total Target VOCs

a-' t ^ULt

110WIM -ti

CARROLLINDUSTRIES

VERTICAL PROFILE ID

VP-01 (1)

VP-02

VP-03

VP-04

VP-05

VP-06

VP-07

VP-08 (2)

VP-09

VP-10

VP-11

VP-12

VP-13

VP-14 (3)

VP-15

VP-16

VP-17

VP-18

VP-19

VP-20

VP-21

VP-22

VP-23 (3)

INTERPRETED DEPTHTO SILT LENSE (FT

BGS)7'

8'

9'

11'

±13'

±17'

7-8'

7'

8'

7'

8'

8'

10'

8'

8'

15'

16'

3B'

8'

10'

9'

10'

42 '

DEPTH OF SAMPLE(FT BGS)

5.00'

7.00'

7.80'

9.75'

14.00'

18.10'

6.70'

7.01'

6.20'

6.18'

7.10'

7.10'

9.24'

6.10'

7.00'

13.58'

19.40'

39.60'

6.38'

10.67'

5.78'

5.92'

32.82'

TOTAL VOC CONC^(MG/L)

9.6

1663

32.1

0.13

0.70

ND

66100

258

54.10

1035

1393

2404

40.2

21.60

6250

4.90

0.40

13.3

106

21.0

42.0

109

19.9

(1) SAMPLE COLLECTED 2 FT.(2) HIGHEST CONCENTRATIONS(3) HIGHEST CONCENTRATIONS

NOTE: CONTOURS DEVELOPED2002 PROFILING AND RECENT

ABOVE TOP OF SILTAT WATER TABLE AND TOP OF SILTWERE NOT AT TOP OF SILT

USING ANALYTICAL RESULTS FROM JUNE/JULYHISTORICAL GROUNDWATER DATA.

KEARMETALLURCORPORATIO

Excavation

LEGEND

© VERTICAL PROFILE

• 0 - WELL

WELL POINT

EXISTING WELL POINT

• SURFACE WATER POINT

NOTE

CONCENTRATIONS IN ppb (TOTAL VOC)



NEW HAMPSHIRE

CLIENT APPROVALS

nvironmentalServices

VERTICAL PROFILE INVESTIGATIONTOTAL VOC CONCENTRATION

CONTOURS AT TOP OF SILT LAYER

BEG

AS SHOWN

AUG 2002W.O. NO.

01395-022-007FIG 9

KEARSARGEMETALLURGICALCORPORATION

GROUNDWATERCOLLECTIONTRENCH

GP-15H

(8964)

GP-12H

(10838)GP-18H

(2193)

\ GP-08\ (922) GP-20

H(3446)

H GPV13

(3920)GP-TQ

(1769)

GP-07

(2760)

LEGEND

TOTAL VOC CONCENTRATION IN PPB

APPROXIMATE SCALE IN FEET



NEW HAMPSHIRE

CLIENT APPROVALS

InvironmentalServices

GEOPROBE CORE INVESTIGATIONCONTOURS OF MAXIMUM DETECTED TOTAL

VOC CONCENTRATION IN EACH BORING

A.J.M.

AS SHOWN

FEB 2003

01395-022-008FIG. 10

Documents

FINAL 2002 OPERATIONS AND MAINTENANCE REPORT · F:\USER\SHARE\KEARSARGE ESD DOCS\46949\02RPTR_FNL.DOC 1-1 10/6/2003 1. INTRODUCTION This 2002 Operations and Maintenance (O&M) Report