NATURAL ATTENUATION EVALUATION REPORT

1745 Dorsey Road, Suite J, Hanover, MD 21076 p | 410.850.0404 f | 410.850.0049

NATURAL ATTENUATION EVALUATION REPORT

Part 1

Inactive Exxon Facility #28077 14258 Jarrettsville Pike

Phoenix, Maryland Case Number 2006-0303-BA2

Facility I.D. No. 12342

Prepared By: Prepared For: Kleinfelder ExxonMobil Environmental & 1745 Dorsey Road, Suite J Property Solutions Company Hanover, MD 21076 1400 Park Avenue, Building 7

Linden, NJ 07036

ONLY THE CLIENT OR ITS DESIGNATED REPRESENTATIVES MAY USE THIS DOCUMENT AND ONLY FOR THE SPECIFIC PROJECT FOR WHICH THIS REPORT WAS PREPA

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NATURAL ATTENUATION EVALUATION REPORT INACTIVE EXXON FACILITY #28077 14258 JARRETTSVILLE PIKE PHOENIX, BALTIMORE COUNTY, MARYLAND MDE CASE # 2006-0303-BA2 KLEINFELDER PROJECT NO.: 20193011.001A

JULY 25, 2019

Copyright 2019 Kleinfelder All Rights Reserved

ONLY THE CLIENT OR ITS DESIGNATED REPRESENTATIVES MAY USE THIS DOCUMENT AND ONLY FOR THE SPECIFIC

PROJECT FOR WHICH THIS REPORT WAS PREPARED.

http://www.kleinfelder.com/


20193011.001A/BAL19R98570 Page ii of iv July 25, 2019 © 2019 Kleinfelder www.kleinfelder.com

A Report Prepared for:

Mr. Christopher Ralston Maryland Department of the Environment Remediation Division, Oil Control Program 1800 Washington Blvd., Suite 620 Baltimore, Maryland 21230 NATURAL ATTENUATION EVALUATION REPORT INACTIVE EXXON FACILITY #28077 14258 JARRETTSVILLE PIKE PHOENIX, BALTIMORE COUNTY, MARYLAND MDE CASE # 2006-0303-BA2 KLEINFELDER PROJECT NO.: 20193011.001A Prepared by: Stacey E. Schiding Project Manager Reviewed by: Mark J. Schaaf, CPG Project Director KLEINFELDER 1745 Dorsey Rd. Suite J Hanover, MD 21076 Phone: 410.850.0404 Fax: 410.850.0049 July 25, 2019 20193011.001A


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TABLE OF CONTENTS

____________________________________________________________________________

Section Page

INTRODUCTION .................................................................................................. 1 1.1 Background ................................................................................................ 1 1.2 Purposes and objectives ............................................................................ 1

2 TESTING SAMPLING AND ANALYSIS PLAN .................................................... 3 2.1 Monitoring well testing network .................................................................. 3

2.2 Field parameters ........................................................................................ 6

2.3 Laboratory analysis .................................................................................... 6

2.3.1 Electron Donor/Acceptor Indicators ................................................. 6 2.3.2 Environmental Conditions for Microbial Activity............................... 7

2.3.3 Hydrocarbon Analytes ..................................................................... 7 2.3.4 Microbial Testing ............................................................................. 7

2.4 Field methods and apparatus .................................................................... 8

3 RESULTS ............................................................................................................. 9 3.1 HISTORICAL CONCENTRATION TRENDS ............................................. 9

3.2 ELECTRON DONOR / ACCEPTOR INDICATORS ................................... 9 3.2.1 Oxidation Reduction Potential (ORP) ............................................ 10

3.2.2 Electron Acceptors and Redox Byproducts ................................... 11

3.2.3 Microbial Environmental Conditions .............................................. 12

3.3 MICROBIAL TESTING RESULTS ........................................................... 12

4 DISCUSSION ..................................................................................................... 15

5 CONCLUSIONS ................................................................................................. 17

6 RECOMMENDATIONS ...................................................................................... 18 6.1 ADDITIONAL TESTING AND ANALYSIS ................................................ 18 6.2 TARGETED BIOSPARGE TESTING ....................................................... 18

6.2.1 Pilot Test Layout and Configuration .............................................. 19 6.2.2 Methodology and Sequence ......................................................... 19 6.2.3 Equipment and Apparatus ............................................................. 20

6.2.4 Reporting ...................................................................................... 21

7 REFERENCES ................................................................................................... 22

8 LIMITATIONS ..................................................................................................... 23


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TABLES 1 Natural Attenuation Testing Sampling and Analysis Plan Matrix 2 Groundwater Analytical Results 3 Natural Attenuation Results Matrix 4 Oxidation-Reduction Potential Measurements FIGURES 1 Site Map 2a 2019 MtBE Analytical Results Map – East 2b 2019 MtBE Analytical Results Map – West 3a ORP Distribution Map – Shallow 3b ORP Distribution Map – Deep 4a QuantArray® Microbial Testing Results – MW-187A 4b QuantArray® Microbial Testing Results – MW-187B 4c QuantArray® Microbial Testing Results – MW-187C 4d QuantArray® Microbial Testing Results – MW-54B 4e QuantArray® Microbial Testing Results – MW-54C 4f QuantArray® Microbial Testing Results – MW-138D 4g QuantArray® Microbial Testing Results – MW-40 4h QuantArray® Microbial Testing Results – MW-189D APPENDICES A Laboratory Analytical Report – Chemical B Laboratory Analytical Report – Microbial C Microbial Insights Protocols


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1 INTRODUCTION

____________________________________________________________________________

This report presents the testing, results, and evaluation of data that serve as multiple lines of

evidence indicative of biodegradation and potential for natural attenuation at the former Exxon

service station (#28077) located in Phoenix, Baltimore County, Maryland (Figure 1).

1.1 BACKGROUND

Since the 2006 release of gasoline, a combination of total fluids pumping, multi-phase vacuum

extraction, and soil vapor extraction have been effective at removing hydrocarbon mass.

Dissolved-phase hydrocarbons have been significantly reduced in concentration and retracted in

extent as the result of remediation activities.

Residual concentrations above MDE action levels generally remain in the following areas:

• Proximate to the release on the service station property;

• Within or near the MD-145/MD-146 intersection;

• On properties bounding the intersection to the east;

• Monitoring wells in the “near northeast” area (3506, 3506 and 3508 Hampshire

Glen Court).

A natural attenuation evaluation monitoring wells was proposed (Kleinfelder, February 4,2019) to

determine whether groundwater conditions at the Site are conducive to natural attenuation,

principally biodegradation. The proposal was approved by the MDE in letter dated March 20,

2019.

1.2 PURPOSES AND OBJECTIVES

Natural attenuation processes, including biodegredation are expected to effectively complement

reductions in active remediation and are supportive to the protection of supply wells and potential

surface water receptors in the area. It is well established that these processes are active at the

vast majority of hydrocarbon release sites (Wiedemeier, et al., 1999), capable of stabilizing

plumes where sources are not fully remediated and contracting and degrading plumes where

active source reduction has occurred (e.g., the Phoenix site). Consequently, these processes are

expected to complement continued reductions in active remediation, allowing ExxonMobil and the

MDE to make decisions regarding the ongoing need for active remediation in select wells across

the project area and instill confidence in ongoing natural processes subsequent to active and

aggressive remediation.



The natural attenuation evaluation was designed to assess the biodegradation potential of the

aquifer through multiple lines of evidence:

1) the presence of microbes capable of degrading gasoline constituents, including methyl

tertiary butyl ether (MtBE);

2) whether these degraders are active;

3) geochemical indicators of biodegradation through aerobic and/or anaerobic processes;

and,

4) whether aquifer conditions are favorable for microbial activity.



2 TESTING SAMPLING AND ANALYSIS PLAN

___________________________________________________________________________________

This section presents the testing, sampling, and analysis plan, including the monitoring well

network selected; testing, measurements, and analysis conducted; and field and laboratory

methods utilized. Table 1 summarizes the full testing, sampling, and analysis plan in the form of

a matrix organized by site area, monitoring wells, and testing/analyses.

2.1 MONITORING WELL TESTING NETWORK

A network of 40 monitoring wells was selected to evaluate natural attenuation potential in areas

affected to different degrees by gasoline constituents as a result of the 2006 release. These

monitoring wells are grouped into four general areas: 1) release area; 2) plume core; 3)

downgradient distal plume; and, 4) “background” conditions in areas without historical impact from

the release. These areas are general categories based on relative historical and residual

concentrations, historical extent of light non-aqueous phase liquid (LNAPL), and groundwater flow

directions (see embedded figure below).

Release area

Plume core

Distal plume

Background

Graphic 1 Segments of Gasoline Constituent Plume



For reference, Table 2, and Figures 2a & b present the 2019 semi-annual groundwater sampling

analytical results for MtBE and Table 2 provides the 2019 semi-annual groundwater sampling

analytical results for benzene.

1. Release Area – The selected six wells are located in the former tank field area and in the

intersection of roads MD-146 (Jarrettsville Pike) and MD-145 (Sweet Air Road / Paper Mill

Road), directly downgradient of the release to the northeast. This area was directly

affected by gasoline as a separate phase liquid (SPL). MW-27R had sustained elevated

MtBE and benzene concentrations since the time of the release and other wells in this

area continue to exhibit concentrations of MtBE above the MDE action level (20 µg/L)

(Table 2). MW-187A, B and C were selected to provide a vertical profile near the source

area; due to logistical constraints, this area was not targeted for remediation until 2014

when MW-187B was connected to the GWPT system. Consequently, the intersection

remained as an un-remediated source area for an extended duration, allowing for natural

biodegradation processes to occur without interference from remedial intervention.

Monitoring wells selected for the natural attenuation evaluation of the release area include:

• MW-27R (station)

• MW-27B (station)

• SVE-1 (station)

• MW-187A (intersection)

• MW-187B (intersection)

• MW-187C (intersection)

2. Plume Core (Station and Northeast) – These nine wells fall within the core of the original

plume, on the service station property and off the property to the northeast along the strike

line. Select wells in this area also exhibit concentrations of MtBE above the MDE action

level, and MW-1 shows persistent benzene. Monitoring wells MW-54, 54B and 54C have

been targeted to provide a vertical profile of the shallow-to-deep transition point for the

plume and elevated MtBE concentrations persist at this location. Monitoring well MW-

138D, sampled via water FLUTe™ liner, has persistent MtBE concentrations above action

levels in several deeper intervals, and has not responded to active remediation on the

nearby 3501 Hampshire Glen Court property (Table 2).

• MW-1 (station)

• MW-7 (station)

• MW-13 (station)

• SVE-3 (station)

• MW-54 (northeast)

• MW-54B (northeast)

• MW-54C (northeast)


• MW-138D (northeast)

• MW-181C (northeast




3. Distal Plume (northeast and southwest) – These 17 wells lie at the outer limits of the

plume, to both the northeast and southwest directions from the Site. Some of these

monitoring wells have been impacted above the MDE action level for MtBE over the past

12 years, while some have not. A few monitoring wells continue to exhibit occasional

detections of MtBE above 20 µg/L, and some, like MW-178C, are consistently above the

action level (Table 2). In the southwest, only MW-40 continues to exhibit concentrations

at or approaching the MDE action level for MtBE. Monitoring wells MW-56A, B and C

provide a vertical profile of groundwater conditions at the distal extent of the former plume.

In the northeast, MW-178C, MW-184, and MW-168 exhibit historical “deeper” impact offset

from the original “strike line” of contaminant migration through 3501 Hampshire Glen

Court. The distal shallow to intermediate groundwater conditions are represented by MW-

89, MW-82B, and MW-82D. MW-189D, the farthest monitoring well to the northeast,

represents a deep well where MtBE has been detected above MDE action levels during

later stages of investigation (Table 2). A vertical profile of the “near northeast” area is

provided by MW-38, 38B and 38C, while MW-74 and MW-75 are located in the shallow

water table along the “strike line” contaminant migration track.

• MW-40 (southwest)

• MW-71 (southwest)

• MW-56A (southwest)

• MW-56B (southwest)

• MW-56C (southwest)















4. Background (northeast and southwest) – The last group of six wells proposed for inclusion

in the evaluation represent “background” conditions, and are removed, both in distance

and concentration, from the remaining residual impact. None of the wells in this group

have ever been above the MDE action level for MtBE and all have been ND/j-flag since at

least August 2006. The MW-42 cluster (MW-42A through MW-42C) will provide a vertical

profile in an area with minimal historical impact located off the “strike line” in the southwest.

Similarly, MW-92, 92A and 92C will supply the same for the northeast.

• MW-42A (southwest)

• MW-42B (southwest)

• MW-42C (southwest)


• MW-92A (northeast)


2.2 FIELD PARAMETERS

The 40 monitoring wells included in the study were sampled by conventional methods (low-flow,

HydraSleeve™, or via the sampling port for recovery wells). Prior to the collection of laboratory

samples, a YSI meter was used to measure pH, dissolved oxygen (DO), and oxidation-reduction

potential (ORP). A Hach DS9000 unit and reagent was used in the field to measure ferrous iron.

In addition to the wells included in the full study, ORP was widely measured in most monitoring

wells as a general indicator of aerobic or anaerobic conditions throughout the aquifer, which is an

indication of biodegradation.

2.3 LABORATORY ANALYSIS

2.3.1 Electron Donor/Acceptor Indicators

Evidence of aerobic and/or anaerobic biodegradation was evaluated by analyzing groundwater

samples for the presence and depletion of electron acceptors (dissolved oxygen, nitrate, sulfate,

CO2) and the accumulation of products of anaerobic biodegradation (ferrous iron and methane).

Samples were submitted under chain-of-custody to Eurofins Lancaster Laboratories (Eurofins) in

Lancaster, Pennsylvania for analysis via EPA method 300.0 (nitrate, sulfate), and RKSOP-175

(CO2 by headspace, methane). Ferrous iron was measured in the field using a Hach DS9000

unit and reagent.



2.3.2 Environmental Conditions for Microbial Activity

The favorability of conditions for microbial activity was evaluated by measuring pH, temperature,

and the presence of microbial nutrients such as orthophosphate. A YSI meter was used to

measure pH and temperature, while orthophosphate was measured in the field using a Hach

DS9000 unit and reagent.

2.3.3 Hydrocarbon Analytes

Hydrocarbon analysis was conducted in most monitoring wells sitewide (including the 40

monitoring wells in this study) during February and March 2019 to determine the concentrations

of dissolved-phase hydrocarbon analytes including benzene, toluene, ethylbenzene, xylenes

(BTEX), 5 fuel oxygenates known as “Oxy5” (tert-Amyl methyl ether [TAME], tert-Butyl alcohol

[TBA], Ethyl tert-butyl ether [ETBE], di-Isopropyl ether [DIPE], MtBE, and naphthalene. Samples

were submitted under chain-of-custody to Eurofins for analysis via EPA method 8260B.

2.3.4 Microbial Testing

Microbial Insights of Knoxville, TN performs microbial analysis via two different media – aqueous

“grab” samples and Bio-Traps®. Bio-Traps® are passive samplers that collect microbes over 30-

45 days. They are constructed from “beads” made of Nomex® and activated carbon, which, when

deployed in a well, absorb contaminants and nutrients from the groundwater and provide a matrix

to be colonized by microbes. Results obtained from Bio-Traps® are less variable than those

obtained from aqueous “grab” samples, and better reflect spatial and temporal changes in the

aquifer than grab samples can. Bio-Traps® were used when possible; however, they cannot be

deployed in wells under active recovery, or which already have other passive sampling equipment

installed. For these wells, aqueous grab samples were collected.

Microbial Insights’ QuantArray® provides evidence of microbes capable of degrading MtBE,

BTEX, polycyclic aromatic hydrocarbons (PAHs), and a variety of short and long chain alkanes

by quantification of the specific functional genes responsible for both aerobic and anaerobic

biodegradation of these compounds.

In addition to the existence and abundance of specific microbial contaminant degraders, Microbial

Insights conducts stable isotope probing to demonstrate biodegradation by loading the Bio-Trap®

with 13C and analyzing for the partitioning of 13C into biomass or inorganic carbon.



2.4 FIELD METHODS AND APPARATUS

Monitoring wells included in the natural attenuation evaluation were sampled via low-flow

techniques, HydraSleeve™ or from the sample port (active recovery wells), using a YSI water

quality meter to record pH, temperature, ORP, and DO. For wells usually sampled via

HydraSleeve™, the samples were collected (via HydraSleeve™) from the interval with the highest

historical MtBE concentrations. For non-recovery wells without target sample depths, the pump

intake was set at the middle of the water column within the screened/open hole portion of the well.

The wells were allowed to stabilize before samples were collected. Samples were shipped on ice

under chain-of-custody to Eurofins for analysis of nitrate, sulfate, methane and CO2. Samples

were also submitted under chain-of-custody to Eurofins for analysis of BTEX, Oxy5, and

naphthalene via EPA method 8260B. A Hach DS9000 unit and reagents were used in the field to

measure ferrous iron and orthophosphate.

Monitoring wells MW-27B, MW-40, MW-54B, MW-54C, MW-138D, MW-187A, MW-187B, MW-

187C, MW-188D, and MW-189D were selected for microbial analysis by QuantArray® and/or

Stable Isotope Probing (SIP) (Appendix B).

Bio-Traps® were installed in MW-27B, MW-40, MW-54C, MW-188D, and MW-189D. The Bio-

Traps® were suspended with nylon string inside the monitoring wells after the sampling for

chemical laboratory analysis was completed (see Appendix C – Microbial Insights’ Protocols for

details). After 30 days, the Bio-Traps® were collected and shipped overnight on ice to Microbial

Insights for analysis.

One-liter aqueous samples were collected from MW-40, MW-54B, MW-138D, MW-187A, MW-

187B, MW-187C, MW-188D, and MW-189D and shipped on ice overnight to Microbial Insights in

Knoxville, TN for QuantArray® analysis.



3 RESULTS

____________________________________________________________________________

This section summarizes the measurement, analysis, and testing results obtained for the

evaluation of natural attenuation via biodegradation at the Site. Results include discussion of

concentration trends, electron donor / acceptor (redox) indicators, and microbial testing results.

Table 3 consolidates the testing and analytical in the framework of the testing, sampling, and

analysis plan matrix. The laboratory analytical reports for chemical parameters are included as

Appendix A and the microbial laboratory reports are provided as Appendix B.

3.1 HISTORICAL CONCENTRATION TRENDS

Marked concentration reduction and plume contraction have been observed during the project,

as documented in quarterly remedial action project reports (RAPRs) and annual concentration

trend analysis provided to MDE . Such concentration reduction typically represents a primary line

of evidence for the effectiveness of natural attenuation. However, the ability to attribute

concentration reductions to biodegradation is confounded by active, aggressive, and extensive

groundwater remediation (groundwater extraction, dual phase extraction, and vapor extraction),

which was initiated shortly after the release and has been ongoing since.

3.2 ELECTRON DONOR / ACCEPTOR INDICATORS

Comparing relative concentration differences in electron donors and acceptors from background

areas (areas of little or no impact) to areas with elevated concentrations of gasoline constituents

(e.g., MtBE and benzene) provides a line of evidence for biodegradation. These patterns develop

as a result of microbial transfer of an electron from hydrocarbon molecules to electron acceptors

during the biodegradation process (Wiedemweier et al., 1995). Results are reflected as depleted

concentrations of electron acceptors (DO, nitrate, sulfate) and accumulation of redox byproducts

(ferrous iron, methane) in areas affected by gasoline constituents. Oxidation-reduction potential

(ORP) provides a general indicator of the redox condition of the aquifer and the extent to which

biodegradation may be occurring.

Perimeter areas of the site were identified in the far southwest and northeast to serve as

background locations that are expected to be representative of the availability of electron

acceptors that naturally occur within the aquifer that have not been depleted by biodegradation.



Monitoring wells MW-42A, MW-42B, and MW-42C (192’) were selected to represent background

conditions in the southwest. Monitoring wells MW-92, MW-92A, and MW-92C (210’-215’) were

selected to represent background conditions in the northeast. Associated electron acceptor and

analytical data are provided in Table 3.

3.2.1 Oxidation Reduction Potential (ORP)

ORP data were measured in 216 shallow and deep monitoring wells during the 2019 semi-annual

groundwater sampling event, providing high data density laterally and vertically throughout the

site. ORP measurements are provided on Table 4 and the interpolated ORP distribution is

presented on Figure 3a (shallow) and Figure 3b (deep).

Shallow Zone (A and B Series Monitoring Wells)

ORP results are predominantly positive throughout the shallow zone (A and B series monitoring

wells), reflecting the removal of gasoline constituents by active remediation, resulting in extensive

aquifer restoration. The shallow zone is also more directly replenished by recharge of oxygenated

water from precipitation and is susceptible to aeration as the water table fluctuates.

An area of relatively low ORP is noted beneath 14301 Jarrettsville Pike, directly across the

intersection from the former service station, primarily represented by a negative ORP value of -

125.7 mV associated with MW-121 (Figure 3a). This area is proximate to and was affected by

gasoline constituents, including SPL, from the release at the service station.

Deep Zone (C and D Series Monitoring Wells)

The deep zone (C and D series monitoring wells) generally exhibits positive ORP (typically 0 to

60 mV), but less than the shallow zone. The deep zone is not as susceptible to direct recharge

of oxygenated water or aerating water table fluctuations.

A distinct area of negative ORP is noted beneath 3501 Hampshire Glen Court) (Figure 3b) where

residual gasoline constituents remain sequestered at depth, have experienced lesser influence

from active remediation, and lesser recharge of oxygenated water. This spatial pattern of ORP

data indicates that biodegradation processes are active in this remaining ‘pocket’ of residual

gasoline constituents. ORP data relative to MtBE concentration in the near northeast area is

summarized as follows:



Monitoring

Well

MtBE

(µg/L)

ORP

(mV)

MW-47C 2 -44.7

MW-73C 220 -45.7

MW-91C 16 -112.5

MW-177 2 -65.9

MW-182 170 -4.9

MW-183 17 -101.4

MW-184 8 -95.8

MW-185 2 -122.3

Data from 2019 semi-annual sampling event.

Patterns of negative ORP (<-100 mV) are also noted in the peripheral south and northwest areas

of Figure 3b. The extent of the contouring in these areas is a function of computer extrapolation

and limited data control.

3.2.2 Electron Acceptors and Redox Byproducts

Consistent with the predominantly positive ORP distribution in both the shallow and deep zones,

depletion of electron acceptors (dissolved oxygen, nitrate, and sulfate) and accumulation of redox

byproducts are not strongly indicated. Conversely, nitrate appears to be depleted in MW-184,

which is located within the negative ORP zone beneath 3501 Hampshire Glen Court.

Dissolved Oxygen

Dissolved oxygen results are relatively elevated, indicating little depletion of this electron acceptor

which is consistent with the ORP results. This indicates availability of dissolved oxygen for

aerobic biodegradation; however, some measurements are excessively high, suggesting sample

agitation during measurement or difficulties with field instrumentation.

Nitrate

Nitrate results are comparable to background results and the background concentrations of nitrate

are modest, suggesting limited availability. As noted above, MW-184, located in the low ORP

zone beneath 3501 Hampshire Glen Court (Figure 3b), exhibits the lowest detected nitrate

concentration of all wells, which is attributed to depletion due to biodegradation.

Sulfate

A maximum sulfate concentration of 120 mg/L is associated with background monitoring well MW-

42B, suggesting potential sulfate reduction in areas affected by gasoline constituents.



Ferrous Iron

Ferrous iron concentrations are also modest, indicating limited ferric iron reduction due to

biodegradation.

Methane

Methane concentrations in background monitoring wells was modest, ranging from non-detect to

41 mg/L with sufficient dissolved CO2 to support methanogenesis. Relatively elevated methane

concentrations, up to 1,100 mg/L (MW-181C), were detected in certain wells that exhibit residual

gasoline constituent concentrations.

3.2.3 Microbial Environmental Conditions

Temperature

According to Wiedemeier et al. (1995), metabolic activity is affected by groundwater temperature,

and biodegradation rates increase with increasing temperature between 5°C and 25°C.

Temperatures less than 5°C inhibit biodegradation. Temperature data (Table 3) are within this

range with many results toward the upper end of the range, indicating a favorable condition for

biodegradation.

pH

Wiedemeier et al. (1995) note that a pH range of 6 to 8 standard units is favorable for microbes

capable of degrading petroleum hydrocarbons. With few exceptions, the vast majority of pH

measurements are within this range (Table 3). Therefore, pH is favorable for biodegradation.

Orthophosphate

Orthophosphate is a nutrient for microbes and its presence is favorable. Orthophosphate was

detected in the majority of monitoring wells sampled, indicating the availability of this nutrient for

microbes.

3.3 MICROBIAL TESTING RESULTS

QuantArray®

QuantArray® is designed to quantify the specific microorganisms and functional genes

responsible for anaerobic and aerobic biodegradation of petroleum products, including BTEX,

MtBE, PAHs, and a variety of short and long chain alkanes. In combination with analytical

chemistry, this tool can be used to evaluate the potential for biodegradation of petroleum



hydrocarbons. QuantArray® laboratory testing results are presented in Appendix B along with

more detailed explanation of results. Figures 4a through 4h present QuantArray® results in the

form of graphs illustrating the abundance of microbes capable of degrading various hydrocarbon

constituents.

Each dot on Figures 4a through 4h represents a microbial population capable of degrading the

compound(s) indicated in the columns. Low results do not necessarily indicate limited

degradation potential or a mixed response, as not all microbial populations are expected to be

present and/or abundant. A single high (green) result, for instance, indicates the abundant

presence of a microbial population capable of degrading the compound(s) listed in the respective

column.

These results are summarized on Table 3 and in the embedded table below.

Relative Abundance of Microbial Degraders

Monitoring

Well

Aerobic

MtBE

Aerobic

BTEX

Anaerobic

BTEX

MW-187A High High Moderate

MW-187B High Moderate Moderate

MW-187C High Moderate Moderate

MW-54B High High Moderate

MW-54C High High Moderate

MW-138D High High Moderate

MW-188D High High Moderate

MW-40 High High High

These results indicate a high proportion of the aerobic MtBE degrader PM1 in every sample

subjected to QuantArray® analysis. According to Microbial Insights, PM1 is one of the few

organisms isolated to date capable of utilizing MTBE and TBA as growth supporting substrates.

Nearly all samples exhibit a high proportion of aerobic BTEX degraders, except for MW-187B and

MW-187C, which exhibit a moderate proportion. However, Toluene/Benzene Dioxygenase

(TOD), an indicator of aerobic benzene degraders was low for nearly all samples with the

exception of MW-54C in which it was measured in moderate proportion. All samples exhibit a

moderate proportion of anaerobic BTEX degraders except for MW-40, which has a high

proportion.



These results demonstrate the abundance of MtBE and BTEX degraders at all locations and

depths analyzed, which is a positive indication of the biodegradation potential throughout the

aquifer, especially under aerobic conditions.

Stable Isotope Probing

Stable isotope probing (SIP) tracks the fate of the isotope13C that is used to label MtBE and

benzene that are then ‘baited’ into Bio-Traps®. Detection of the 13C isotope in microbial

membranes in the form of phospholipid fatty acids (PLFAs) is evidence of incorporation of the

isotope labeled compounds into the microbial biomass. Detection of the 13C isotope in dissolved

inorganic carbon is evidence that the microbes have been mineralized (broken down) they

contaminant. SIP results indicate:

• MTBE was incorporated into microbial biomass and metabolized in the MW-27B sample,

but not in the MW-40 and MW-189D sample. Mineralization was not evident during the

period of deployment.

• Benzene was incorporated into microbial biomass and metabolized in the MW-54C

sample though mineralization was not evident at this well during the period of deployment.



4 DISCUSSION

____________________________________________________________________________

Results of the natural attenuation study indicate that environmental conditions (temperature and

pH) are within optimal ranges for microbial activity and that the microbial nutrient orthophosphate

is available to support microbial activity.

ORP is predominantly positive throughout the shallow zone (A and B series monitoring wells),

reflecting aquifer restoration due to the removal of gasoline constituents by active remediation.

The shallow zone is also more directly replenished by recharge of oxygenated water from

precipitation and is susceptible to aeration as the water table fluctuates. This is favorable for

aerobic biodegradation in the shallow zone. The deep zone (C and D series monitoring wells)

also exhibits positive ORP, but less than the shallow zone. The deep zone is not as susceptible

to direct recharge of oxygenated water or aerating water table fluctuations.

A distinct area of negative ORP is noted beneath 3501 Hampshire Glen Court where residual

gasoline constituents remain sequestered at depth, have experienced lesser influence from active

remediation, and lesser recharge of oxygenated water. This spatial pattern of ORP data indicates

that biodegradation processes are active in this remaining ‘pocket’ of residual gasoline

constituents.

Depletion of electron acceptors (dissolved oxygen, nitrate, and sulfate) and accumulation of redox

byproducts are not strongly indicated, which is consistent with the spatial distribution of

predominantly positive ORP in the aquifer. This is attributed to contaminant mass removal /

aquifer restoration, replenishment of oxygenated water to the shallow zone, and potential limited

electron acceptor availability with regards to nitrate. This is not an indicator adverse to

biodegradation, rather it is an indicator of improved aquifer conditions and an abundance of

dissolved oxygen (oxygenated water) to support aerobic biodegradation. Monitoring well MW-

184, located within the discrete zone of negative ORP beneath 3501 Hampshire Glen Court,

exhibits the lowest detected nitrate concentration, consistent with negative ORP and indicating

biodegradation.

Microbial results are favorable, indicating a high abundance of the aerobic MtBE and BTEX

degraders with a moderate abundance of anaerobic BTEX degraders. MtBE and benzene were



incorporated into microbial biomass and metabolized in MW-27B and MW-54C, respectively.

Mineralization was not evident in these few wells during the period of deployment.

SIP results indicate:

• MTBE was incorporated into microbial biomass and metabolized in the MW-27B sample,

but not in the MW-40 and MW-189D sample. Mineralization was not evident during the

period of deployment.

• Benzene was incorporated into microbial biomass and metabolized in the MW-54C

sample though mineralization was not evident at this well during the period of deployment.



5 CONCLUSIONS

____________________________________________________________________________

The potential for microbial biodegradation in shallow and deep portions of the aquifer is indicated

based on the following observations and conditions:

• There is an abundance of MtBE and BTEX degraders present throughout the aquifer,

especially aerobic degraders.

• Microbial environmental conditions (temperature and pH) are within the optimal range for

microbial activity, and he microbial nutrient, orthophosphate, is available.

• SIP results indicate that indicate:

o MTBE was incorporated into microbial biomass and metabolized in the MW-27B

sample, but not in the MW-40 and MW-189D sample. Mineralization was not

evident during the period of deployment.

o Benzene was incorporated into microbial biomass and metabolized in the MW-54C

sample though mineralization was not evident at this well during the period of

deployment.

• Oxygen is available for aerobic biodegradation:

o Positive ORP conditions exist throughout much of the aquifer

o The shallow zone is replenished with oxygenated water through recharge and

water table fluctuation.

A discrete area of negative ORP occurs in the deep portion of the aquifer beneath 3501

Hampshire Glen Court, which corresponds to residual concentrations of gasoline constituents that

remain sequestered at depth. Additionally, this zone does not experience as much remediation

influence nor substantial replenishment of oxygenated water via recharge. This pattern is

evidence of active biodegradation occurring at the last remaining ‘pocket’ of sequestered and

recalcitrant gasoline constituents in the aquifer. Downgradient migration of gasoline constituents,

particularly MtBE from this area would enter an aerobic portion of the aquifer with the dissolved

oxygen capacity and aerobic MtBE degraders necessary to degrade and mineralize MtBE, limiting

migration. Additionally, this area beneath 3501 Hampshire Glen Court is a candidate for

enhanced biodegradation by the addition of dissolved oxygen.



6 RECOMMENDATIONS

____________________________________________________________________________

Based on the positive indication of biodegradation potential and evidence of biodegradation

activity acting upon a discrete zone of sequestered gasoline constituents, focused additional

analysis and testing is recommended.

6.1 ADDITIONAL TESTING AND ANALYSIS

Targeted natural attenuation sampling for field parameters, electron donors / acceptor indicators,

microbial nutrients, and microbial indicators is recommended to be conducted in the discrete area

of negative ORP and residual gasoline constituents at depth beneath 3501 Hampshire Glen

Court. These data will serve to validate that biodegradation is occurring in this discrete portion of

the aquifer and will serve as a baseline dataset prior to enhanced biosparge testing of this area,

which is recommended in the following sections. The following monitoring wells are

recommended for additional full-suite biodegradation evaluation testing: MW-183, MW-184, MW-

91C, and MW-185.

6.2 TARGETED BIOSPARGE TESTING

A biosparge pilot test is proposed to evaluate the ability to stimulate and/or enhance aerobic

biodegradation within the deep zone beneath 3501 Hampshire Glen Court. The current

groundwater remediation system is configured to distribute compressed air to multiple recovery

wells containing pneumatic groundwater recovery pumps. The engineering concept would use

the existing air compressor and airlines to sparge air into an existing well at a relatively low

flowrate compared to air sparging. This is expected to increase the amount of dissolved oxygen

in the formation and stimulate or enhance aerobic biodegradation. The objectives of the

biosparge pilot test are to:

1) Evaluate the ability to deliver air to groundwater using existing apparatus and

infrastructure;

2) Evaluate the ability to oxygenate the aquifer proximate to and downgradient of the

biosparge well; and,



3) Monitor for evidence of enhanced biodegradation as a consequence of oxygen delivery

into the aquifer.

6.2.1 Pilot Test Layout and Configuration

MW-91C, located in the middle of 3501 Hampshire Glen Court (Figure 1), is identified as the

candidate biosparge pilot test delivery well for the following reasons:

• Exhibits negative ORP (-112 mV), indicating biodegradation that can be enhanced with

additional dissolved oxygen;

• Exhibits residual concentrations of MtBE (16 µg/L [March 13, 2019]) that can be further

reduced;

o Central to the discrete ‘pocket’ of negative ORP and within the northeast line of

MtBE plume migration along strike;

o Has a demonstrated water-bearing fracture at approximately 145 feet below top of

casing (ft-toc) that may facilitate delivery of oxygenated water into the formation

(Kleinfelder, August 15, 2011);

o Recently deactivated as a recovery well with necessary air delivery apparatus, but

without having to take an active recovery well off line;

o Downgradient monitoring wells (MW-185 and MW-177) also exhibit negative ORP

and residual MtBE, making for applicable and relevant monitoring locations;

o Downgradient migration of dissolved oxygen may be enhanced with newly

activated recovery well MW-138D located farther downgradient.

6.2.2 Methodology and Sequence

The steps of the testing methodology are outlined sequentially below:

1) Collect and analyze groundwater samples for BTEX and Oxy5 per Method 8260B and

measure baseline field parameter readings (DO, ORP, pH, temperature, and ferrous

iron test kit) and depth to groundwater in MW-91, MW-91C, MW-185, MW-176, MW-

177, and MW-168, prior to initiating biosparging.



2) Reconfigure existing pumping and tubing apparatus in MW-91C to deliver air for

biosparging, targeting the prominent water-bearing fracture in MW-91C, previously

identified by borehole geophysical and hydraulic testing at approximately 145 ft-toc

(Kleinfelder, August 15, 2011). Place air discharge 5 feet below the fracture (target

depth = 150 ft-toc).

3) Deploy transducers to measure and log temperature, pH, ORP, specific conductivity, and

depth to water continuously for the duration of the test in MW-91 and MW-185.

4) Initiate biosparging in MW-91C and collect and analyze groundwater samples from

monitoring wells (MW-91, MW-185, MW-176, MW-177, and MW-168) for BTEX and

Oxy5 per Method 8260B and measure field parameters (DO, ORP, pH, temperature,

and ferrous iron test kit) and depth to water monthly for duration of the test (6 months).

5) Shut off biosparge in MW-91C and collect groundwater samples for biosparge well MW-

91C and monitoring wells MW-91, MW-185, MW-176, MW-177, and MW-168, and

analyze for BTEX + Oxy5 analyses and measure field parameter readings (DO, ORP,

pH, temperature, and ferrous iron test kit) and depth to groundwater in MW-91, MW-

91C, MW-185, MW-176, MW-177, and MW-168 daily for five days.

6) Provide report of results with recommendations to MDE.

6.2.3 Equipment and Apparatus

The existing pneumatic line will be extended into monitoring well MW-91C and will be connected

to a ¾-inch schedule 80 (SCH 80) polyvinyl chloride (PVC) pipe. The ¾-inch SCH 80 PVC will

extend to a diffuser using a variety of couplings and adapters to a target depth of 150 ft-toc, which

is 5 feet below the target fracture. The dedicated airline will be temporarily connected to the air

delivery line within the well vault, and the air line to the pneumatic pump would be disconnected

from the air line in the vault, and pneumatic pump retrieved. The existing regulator would be used

to adjust the air delivery pressure and flow. The air line within the well vault, leading to the diffuser,

would be fitted with a rotameter to allow an estimate of the volume of air/oxygen injected into

groundwater during the pilot test.



6.2.4 Reporting

The results of additional testing, sampling, and biosparge pilot testing will be compiled, analyzed,

and summarized in a letter report to MDE with conclusions and recommendations for the potential

application of biosparging to supplement the current remedial approach for the Site. Should

results show the ability to distribute dissolved oxygen within groundwater with lagging

biodegradation response, prolonged biosparge testing may also be recommended.



7 REFERENCES

____________________________________________________________________________

Kleinfelder, February 4, 2019, Proposal for Natural Attenuation Evaluation, Inactive Exxon Facility

#28077, 14258 Jarrettsville Pike, Phoenix, Baltimore County, Maryland, MDE Case No. 2006-

0303-BA2.

Kleinfelder, August 15, 2011, Near Northeast Area Supplemental Investigation and Remedial

Measures Report, Inactive Exxon Facility #28077, Phoenix, Maryland, Case Number 2006-0303-

BA2, Facility I.D. No, 12342.

MDE, March 20, 2019, Approval of Proposal for Natural Attenuation Evaluation, Case No. 2006-

0303-BA, Former Exxon R/S No. 2-8077, 14258 Jarrettsville Pike, Phoenix, Baltimore County,

Maryland.

Wiedemeier, T.H., Rifai, H.S., Newell, C.J., and Wilson, J.T., 1999, Natural Attenuation of Fuels

and Chlorinated Solvents in the Subsurface: John Wiley & Sons, New York, New York, 617 p.

Wiedemeier, T., Wilson, J.T., Kampbell, D.H., Miller, R.N., and Hansen, J.E., November 11, 1995,

Technical Protocol for Implementing Intrinsic Remediation with Long-Term Monitoring for Natural

Attenuation of Fuel Contamination Dissolved in Groundwater, Air Force Center for Environmental

Excellence, v. 1.



8 LIMITATIONS

____________________________________________________________________________

Kleinfelder performed the services for this project under the Enabling Agreement with

Procurement, a division of ExxonMobil Global Services Company (signed on November 28,

2012). Kleinfelder states that the services preformed are consistent with professional standard of

care defined as that level of services provided by similar professionals under like circumstances.

This report is based on the regulatory standards in effect on the date of the report. It has been

produced for the primary benefit of ExxonMobil Global Services Company and its affiliates.


TABLES

Table 1 - Natural Attenuation Biodegradation Evaluation Sampling and Testing Plan

Field Parameters Laboratory Analysis (Chemistry) Laboratory Analysis (Microbial)

Conditions Electron Donor / Acceptor Indicators Microbial Nutrient Microbial Indicators

MW pH Temp ORP D.O. Ferrous

Iron (test kit)

Nitrate Sulfate Ferrous Iron Methane CO2 Orthophosphate QuantArray

(MtBE & TBA) QuantArray (Full Petro)

Stable Isotope Probing Rationale

Release Area (Tank Field and Intersection)

MW-27R X X X X X X X X X X X Max sustained source concentration at release

MW-27B X X X X X X X X X X X X (MtBE)

SVE-1 X X X X X X X X X X X

MW-187A X X X X X X X X X X X X (aqueous) Vertical profile near source area. Not directly targeted by remediation until later in lifecycle

MW-187B X X X X X X X X X X X X (aqueous)

MW-187C X X X X X X X X X X X X (aqueous)

Plume Core (Station)

MW-7 X X X X X X X X X X X


SVE-3 X X X X X X X X X X X

MW-1 X X X X X X X X X X X X (benzene) Persistent benzene concentration

Plume Core (Northeast)

MW-54 X X X X X X X X X X X Vertical profile of shallow to deep transition

point, elevated conc MW-54B X X X X X X X X X X X X (aqueous)

MW-54C X X X X X X X X X X X X (biotrap)

MW-73C X X X X X X X X X X X

MW-138D X X X X X X X X X X X X (aqueous) Sustained elevated conc in distal deeper zone

MW-188D X X X X X X X X X X X X (biotrap)


Distal Plume (Southwest)

MW-40 X X X X X X X X X X X X (biotrap) X (MtBE) Remaining MtBE detection in SW


MW-56A X X X X X X X X X X X

Vertical profile at distal extent MW-56B X X X X X X X X X X X


Distal Plume (Northeast)

MW-178C X X X X X X X X X X X Deeper zone off-set from original “strike line” of migration through 3501 HGC with historical

concentrations MW-184 X X X X X X X X X X X



Distal shallow to intermediate depth MW-82B X X X X X X X X X X X

MW-82D X X X X X X X X X X X

MW-189D X X X X X X X X X X X X (biotrap) X (MtBE) Distal deeper zone monitoring point where

MtBE has been detected


Vertical profile in near northeast area MW-38B X X X X X X X X X X X


MW-74 X X X X X X X X X X X Distal, shallow (water table ‘A-Zone’) on “strike line” migration track MW-75 X X X X X X X X X X X

Background / Perimeter (Southwest)

MW-42A X X X X X X X X X X X Vertical profile with minimal historical impact off-

“strike line” MW-42B X X X X X X X X X X X


Background / Perimeter (Northeast)

MW-92 X X X X X X X X X X X Vertical profile with minimal historical impact off-

“strike line” MW-92A X X X X X X X X X X X


TBA

(µg/L)

Summary of Groundwater Analytical Results

Well ID Date Benzene

(µg/L)

Toluene

(µg/L)

Ethyl-

benzene

(µg/L)

Total

Xylenes

(µg/L)

DIPE

(µg/L)

ETBE

(µg/L)

TAME

(µg/L)

Total

BTEX

(µg/L)

MTBE

(µg/L)

Page 1 of 8

Comments

Inactive Exxon Facility #28077

14528 Jarrettsville Pike

Phoenix, Maryland

April 4, 2019 through June 26, 2019

Table 1

MW-1 ND(5) ND(130) ND(5) ND(5) ND(5) 22003 J 1100 520 3823 J4/8/2019

MW-1A [R] ND(1) ND(25) 0.2 J ND(1) ND(1) ND(5)ND(1) ND(1) ND(1) BRL5/21/2019

MW-2 ND(1) ND(25) ND(1) ND(1) ND(1) ND(5)ND(1) ND(1) ND(1) BRL5/16/2019

MW-2A [R] ND(1) ND(25) 0.5 J ND(1) ND(1) ND(5)ND(1) ND(1) ND(1) BRL6/24/2019

MW-3 [R] ND(1) ND(25) 0.6 J ND(1) ND(1) 110ND(1) 3 86 1996/24/2019

MW-4 [R] ND(1) ND(25) 0.6 J ND(1) ND(1) 90ND(1) 3 69 1626/24/2019

MW-6 [R] ND(1) ND(25) 0.6 J ND(1) ND(1) 87ND(1) 3 67 1576/24/2019

MW-7 [R] 0.4 J ND(25) 3 ND(1) ND(1) 5 JND(1) 0.5 J 0.5 J 6 J4/8/2019



MW-13 [R] ND(1) ND(25) 0.9 J ND(1) ND(1) ND(5)ND(1) ND(1) ND(1) BRL4/10/2019

MW-14 ND(5) ND(130) 1 J ND(5) ND(5) 1400ND(5) 170 77 16475/16/2019

MW-16 [R] ND(1) ND(25) 0.6 J ND(1) ND(1) 100ND(1) 3 80 1836/24/2019

MW-16R [R] 22 ND(25) 230 2 43 J17 2 2 24 J6/11/2019


MW-19 [R] ND(1) ND(25) ND(1) ND(1) ND(1) ND(5)ND(1) ND(1) ND(1) BRL6/26/2019

MW-21 [R] ND(1) ND(25) 0.2 J ND(1) ND(1) ND(5)ND(1) 0.2 J ND(1) 0.2 J5/21/2019


MW-23 [R] ND(1) ND(25) 2 ND(1) ND(1) ND(5)ND(1) ND(1) ND(1) BRL5/21/2019


MW-27 [R] ND(1) ND(25) 0.4 J ND(1) ND(1) ND(5)0.3 J ND(1) ND(1) 0.3 J6/24/2019

MW-27B 7 ND(25) 80 0.5 J 0.8 J69 2 ND(1) 174/4/2019

2 ND(25) 120 0.2 J 0.4 J0.8 J1 ND(1) ND(1) 2 J6/13/2019

MW-27R [R] 5 17 J76 0.3 J 0.7 J74 5 8 244/8/2019




7/19/2019

Ref.: rpt_10_aq\Phoenix GW Analytical\10028\M35P185LNAKleinfelder

1745 Dorsey Road Suite J, Hanover, MD

2

TBA

(µg/L)



(µg/L)

Toluene

(µg/L)

Ethyl-

benzene

(µg/L)

Total

Xylenes

(µg/L)

DIPE

(µg/L)

ETBE

(µg/L)

TAME

(µg/L)

Total

BTEX

(µg/L)

MTBE

(µg/L)

Page 2 of 8

Comments



Phoenix, Maryland


Table 1 (Continued)


MW-32 ND(1) ND(25) 5 ND(1) 0.2 JND(5)ND(1) ND(1) ND(1) BRL6/17/2019

MW-36C ND(1) ND(25) ND(1) ND(1) ND(1) ND(5)ND(1) ND(1) ND(1) BRL6/13/2019

MW-36P ND(1) ND(25) 3 ND(1) ND(1) ND(5)ND(1) ND(1) ND(1) BRL6/13/2019

MW-36R ND(1) ND(25) 2 ND(1) ND(1) ND(5)ND(1) ND(1) ND(1) BRL6/13/2019

MW-37 [R] ND(1) ND(25) 1 J ND(1) ND(1) ND(5)ND(1) ND(1) ND(1) BRL6/25/2019

MW-37P ND(1) ND(25) ND(1) ND(1) ND(1) ND(5)ND(1) ND(1) ND(1) BRL6/25/2019

MW-38 [R] 0.9 J ND(25) 8 ND(1) 0.2 JND(5)ND(1) ND(1) ND(1) BRL4/9/2019

MW-38B ND(1) ND(25) ND(1) ND(1) ND(1) ND(5)ND(1) ND(1) ND(1) BRL4/9/2019

MW-38C [R] 3 ND(25) 69 0.8 J 3ND(5)ND(1) ND(1) ND(1) BRL4/9/2019

0.5 J ND(25) 10 0.2 J 0.9 JND(5)ND(1) ND(1) ND(1) BRL6/25/2019


MW-40 ND(1) ND(25) 0.4 J ND(1) ND(1) ND(5)ND(1) ND(1) ND(1) BRL4/8/2019

MW-42A ND(1) ND(25) ND(1) ND(1) ND(1) ND(5)ND(1) ND(1) ND(1) BRL4/10/2019


MW-42C(192) ND(1) ND(25) ND(1) ND(1) ND(1) ND(5)ND(1) ND(1) ND(1) BRL4/10/2019

MW-45 [R] 10 20 J350 2 7ND(5)ND(1) ND(1) ND(1) BRL4/4/2019

2 ND(25) 31 0.3 J 0.8 JND(5)ND(1) ND(1) ND(1) BRL5/22/2019


MW-45R [R] 9 18 J330 2 7ND(5)0.5 J ND(1) ND(1) 0.5 J4/5/2019

0.4 J ND(25) 13 ND(1) 0.5 JND(5)ND(1) ND(1) ND(1) BRL5/21/2019



MW-54 0.4 J ND(25) 2 ND(1) ND(1) ND(5)ND(1) ND(1) ND(1) BRL4/9/2019

MW-54B [R] 0.7 J 14 J19 1 4ND(5)ND(1) ND(1) ND(1) BRL4/11/2019

MW-54C ND(1) ND(25) ND(1) ND(1) ND(1) ND(5)ND(1) ND(1) ND(1) BRL6/26/2019


7/19/2019

Ref.: rpt_10_aq\Phoenix GW Analytical\10028\M35P356L25Kleinfelder


2

TBA

(µg/L)



(µg/L)

Toluene

(µg/L)

Ethyl-

benzene

(µg/L)

Total

Xylenes

(µg/L)

DIPE

(µg/L)

ETBE

(µg/L)

TAME

(µg/L)

Total

BTEX

(µg/L)

MTBE

(µg/L)

Page 3 of 8

Comments



Phoenix, Maryland


Table 1 (Continued)


MW-58 ND(1) ND(25) ND(1) ND(1) ND(1) 0.6 JND(1) ND(1) ND(1) 0.6 J5/13/2019

MW-58R ND(1) ND(25) ND(1) ND(1) ND(1) ND(5)ND(1) ND(1) ND(1) BRL5/13/2019


MW-59B [R] 0.8 J ND(25) 10 ND(1) ND(1) 2 JND(1) ND(1) ND(1) 2 J6/25/2019



ND(1) ND(25) ND(1) ND(1) ND(1) ND(5)ND(1) ND(1) ND(1) BRL6/26/2019


MW-73C 10 190190 1 5ND(5)8 ND(1) ND(1) 84/10/2019

ND(1) ND(25) 0.3 J ND(1) ND(1) ND(5)ND(1) ND(1) ND(1) BRL4/19/2019

5 30086 1 4ND(5)ND(1) ND(1) ND(1) BRL5/21/2019

MW-73C(HS-S) 10 340200 2 7ND(5)7 ND(1) 0.4 J 7 J5/10/2019

MW-73C(HS-D) 10 300200 2 6ND(5)7 ND(1) 0.4 J 7 J5/10/2019


MW-75 [R] ND(1) ND(25) 3 ND(1) ND(1) ND(5)ND(1) ND(1) ND(1) BRL4/9/2019


MW-77A ND(1) ND(25) 0.3 J ND(1) ND(1) ND(5)ND(1) ND(1) ND(1) BRL5/14/2019


MW-77R ND(1) ND(25) ND(1) ND(1) ND(1) ND(5)ND(1) ND(1) ND(1) BRL5/14/2019





MW-82R [R] ND(1) ND(25) 0.5 J ND(1) ND(1) ND(5)ND(1) ND(1) ND(1) BRL5/21/2019

ND(1) ND(25) 1 J ND(1) ND(1) ND(5)0.2 J ND(1) ND(1) 0.2 J6/25/2019

MW-82B [R] ND(1) ND(25) ND(1) ND(1) ND(1) ND(5)ND(1) ND(1) ND(1) BRL4/12/2019

7/19/2019



2

TBA

(µg/L)



(µg/L)

Toluene

(µg/L)

Ethyl-

benzene

(µg/L)

Total

Xylenes

(µg/L)

DIPE

(µg/L)

ETBE

(µg/L)

TAME

(µg/L)

Total

BTEX

(µg/L)

MTBE

(µg/L)

Page 4 of 8

Comments



Phoenix, Maryland


Table 1 (Continued)








MW-91C [R] ND(1) ND(25) 7 1 5ND(5)ND(1) ND(1) ND(1) BRL5/21/2019

MW-91D ND(1) ND(25) ND(1) ND(1) ND(1) ND(5)ND(1) ND(1) ND(1) BRL6/3/2019












MW-121 [R] ND(1) ND(25) 0.4 J ND(1) ND(1) ND(5)0.4 J ND(1) ND(1) 0.4 J5/21/2019





MW-138D 19 ND(25) 270 0.9 J 30.7 J4 0.5 J 0.2 J 5 J4/11/2019

28 ND(25) 420 1 53 J4 0.6 J 0.8 J 8 J5/8/2019

27 ND(25) 410 2 5ND(5)0.7 J ND(1) ND(1) 0.7 J6/26/2019

7/19/2019



2

TBA

(µg/L)



(µg/L)

Toluene

(µg/L)

Ethyl-

benzene

(µg/L)

Total

Xylenes

(µg/L)

DIPE

(µg/L)

ETBE

(µg/L)

TAME

(µg/L)

Total

BTEX

(µg/L)

MTBE

(µg/L)

Page 5 of 8

Comments



Phoenix, Maryland


Table 1 (Continued)


MW-142 ND(1) ND(25) 2 ND(1) ND(1) ND(5)ND(1) ND(1) ND(1) BRL5/14/2019



MW-147PB ND(1) ND(25) ND(1) ND(1) ND(1) ND(5)ND(1) ND(1) ND(1) BRL5/8/2019









MW-168(235) ND(1) ND(25) ND(1) ND(1) ND(1) ND(5)ND(1) ND(1) ND(1) BRL6/14/2019


MW-170 [R] ND(1) ND(25) 0.4 J ND(1) ND(1) ND(5)ND(1) ND(1) ND(1) BRL5/2/2019


MW-171C ND(1) ND(25) 0.9 J ND(1) ND(1) ND(5)ND(1) ND(1) ND(1) BRL6/14/2019


MW-176 [R] ND(1) ND(25) 0.5 J ND(1) 0.2 JND(5)ND(1) ND(1) ND(1) BRL5/2/2019

MW-176CC(HS) ND(1) ND(25) 0.2 J ND(1) ND(1) ND(5)ND(1) ND(1) ND(1) BRL5/13/2019

MW-177 ND(1) ND(25) 4 ND(1) 0.2 JND(5)ND(1) ND(1) ND(1) BRL6/14/2019


MW-178B 0.7 J ND(25) 22 ND(1) 0.3 JND(5)ND(1) ND(1) ND(1) BRL5/20/2019

MW-178C [R] 10 680200 3 13ND(5)ND(1) ND(1) ND(1) BRL4/12/2019

9 520210 2 10ND(5)ND(1) ND(1) ND(1) BRL6/14/2019


7/19/2019

Ref.: rpt_10_aq\Phoenix GW Analytical\10028\28077Kleinfelder


2

TBA

(µg/L)



(µg/L)

Toluene

(µg/L)

Ethyl-

benzene

(µg/L)

Total

Xylenes

(µg/L)

DIPE

(µg/L)

ETBE

(µg/L)

TAME

(µg/L)

Total

BTEX

(µg/L)

MTBE

(µg/L)

Page 6 of 8

Comments



Phoenix, Maryland


Table 1 (Continued)

MW-179C ND(1) ND(25) 0.7 J ND(1) ND(1) ND(5)ND(1) ND(1) ND(1) BRL6/14/2019

MW-180A ND(1) ND(25) 1 J ND(1) ND(1) ND(5)ND(1) ND(1) ND(1) BRL5/20/2019

MW-181A [R] 1 ND(25) 25 0.3 J 0.7 JND(5)ND(1) ND(1) ND(1) BRL5/21/2019

MW-181B ND(1) ND(25) 4 ND(1) ND(1) ND(5)ND(1) ND(1) ND(1) BRL6/17/2019

MW-181C 0.3 J ND(25) 12 ND(1) 0.3 JND(5)ND(1) ND(1) ND(1) BRL4/22/2019

MW-181C(215) 0.4 J ND(25) 17 ND(1) 0.4 JND(5)ND(1) ND(1) ND(1) BRL6/17/2019

MW-182(200) ND(1) ND(25) 2 0.5 J 2ND(5)ND(1) ND(1) ND(1) BRL6/14/2019

MW-183 [R] 3 12080 1 6ND(5)ND(1) 0.3 J ND(1) 0.3 J5/2/2019

0.8 J ND(25) 39 0.9 J 5ND(5)ND(1) ND(1) ND(1) BRL6/14/2019

MW-184 [R] ND(1) ND(25) 4 0.3 J 2ND(5)ND(1) ND(1) ND(1) BRL4/12/2019


MW-187A [R] 28 11 J45 1 211038 200 10 3584/11/2019

55 ND(130) 210 3 J 3 J850150 1300 110 24105/9/2019

MW-187B [R] 25 95280 0.9 J 3606 69 3 1384/11/2019

6 94110 0.2 J 1ND(5)ND(1) 0.3 J ND(1) 0.3 J5/9/2019

MW-187C [R] 19 ND(25) 550 2 9ND(5)ND(1) ND(1) ND(1) BRL4/11/2019

MW-188D(141.5) ND(1) ND(25) 0.8 J ND(1) ND(1) ND(5)ND(1) ND(1) ND(1) BRL6/19/2019

MW-188D(201) ND(1) ND(25) 0.8 J ND(1) ND(1) ND(5)ND(1) ND(1) ND(1) BRL6/19/2019










7/19/2019

Ref.: rpt_10_aq\Phoenix GW Analytical\10028\Kleinfelder


2

TBA

(µg/L)



(µg/L)

Toluene

(µg/L)

Ethyl-

benzene

(µg/L)

Total

Xylenes

(µg/L)

DIPE

(µg/L)

ETBE

(µg/L)

TAME

(µg/L)

Total

BTEX

(µg/L)

MTBE

(µg/L)

Page 7 of 8

Comments



Phoenix, Maryland


Table 1 (Continued)

MW-189D(79) ND(1) ND(25) ND(1) ND(1) ND(1) ND(5)ND(1) ND(1) ND(1) BRL6/18/2019


MW-189D(117-119) ND(1) ND(25) 0.8 J ND(1) ND(1) ND(5)ND(1) ND(1) ND(1) BRL6/18/2019










PW-01 ND(0.5) 6.7 JND(0.5) ND(0.5) 0.4 JND(0.5)ND(0.5) ND(0.5) ND(0.5) BRL5/20/2019

ND(0.5) ND(25) ND(0.5) ND(0.5) ND(0.5) ND(0.5)ND(0.5) ND(0.5) ND(0.5) BRL6/26/2019

SVE-1 [R] ND(1) ND(25) 10 0.7 J 1ND(5)ND(1) ND(1) ND(1) BRL4/11/2019

SVE-3 [R] 7 10 J48 0.9 J 2155 19 0.3 J 39 J4/22/2019


STREAM01 ND(1) ND(25) ND(1) ND(1) ND(1) ND(5)ND(1) ND(1) ND(1) BRL5/10/2019


STREAM02 ND(1) ND(25) ND(1) ND(1) ND(1) ND(5)ND(1) ND(1) ND(1) BRL6/18/2019

7/19/2019



2

Notes:


Page 8 of 8



Phoenix, Maryland


Table 1 (Continued)

[R] - Indicates the well was used for remediation at the time of reporting.

µg/L - micrograms per liter

AP - above packer

BP - below packer

BRL - Below laboratory reporting limits

BTEX - Benzene, toluene, ethylbenzene, and total xylenes

DIPE - di-isopropyl ether

ETBE - ethyl tert butyl ether

HS - Composite HydraSleeve

HS-D - deep composite HydraSleeve sampler; set at bottom of open borehole

HS-S - shallow composite HydraSleeve sampler; set at ½ of open borehole

J - Indicates an estimated value

MTBE - methyl tertiary butyl ether

NA - Not analyzed

ND(5.0) - Not detected at or above the laboratory reporting limit, laboratory reporting limit included.

NS - Not sampled

PW - Inactive supply well being used as a monitoring/sampling location

TAME - tert-amyl methyl ether

TBA - tert butyl alcohol

7/19/2019



2

Microbial Nutrient Hydrocarbons

MtBE / Benzene1 QuantArray QuantArray

(µg/L)(Aerobic

MtBE)

(Aerobic

BTEX)

MW-27R 22.04 79.9 8.67 2.9 64.9 - ND 3,200 J - 74 / 6 - - -

MW-27B 19.49 83.8 20.2 ND 98.7 4 ND 13,000 0.3 33 / 1 - - -

SVE-1 15.37 116.6 4.6 1.7 110 0 ND 9,600 J 0.21 350 / 5 - - -

MW-187A 18.33 189.3 3.17 2.9 6.4 0.1 4.7 J 18,000 0.07 190 / 190 High High Moderate

MW-187B 17.07 98.1 4.03 1.8 9.1 0 ND ND 0.29 37 / ND High Moderate Moderate

MW-187C 15.73 139.9 5.42 ND 17.5 0 ND 2,600 J 0.5 420 / ND High Moderate Moderate

MW-7 19.79 169.9 8.51 5.1 8.2 0.5 ND 7,500 J 0.15 39 / 2 - - -

MW-13 18.05 170.1 2.45 2.2 33.9 2 ND 16,000 0.46 2-Feb - - -

SVE-3 18.6 160.3 5.77 2.2 22.6 0 ND 18,000 0.13 2 / ND - - -

MW-1 19.67 163.2 9.93 4.4 79.6 0.5 28 28,000 0.16 ND / 19 - - -

MW-54 18.41 88.1 5.97 1.6 3.6 J 0.5 65 5,600 J 2.61 ND / ND - - -

MW-54B 13.75 132.3 5.39 2.6 7.9 0 ND 5,500 J 0.43 70 / ND High High Moderate

MW-54C (HS-S) 9.57 13.6 66.1 ND 2 J 0.5 ND ND 0 ND / ND High High Moderate

MW-73C (HS-S) 20.04 13.2 1.87 ND 5.6 1.75 240 ND 0 220 / 9 - - -

MW-138D (151-156) 12.81 34.6 6.23 1.5 16.4 0 ND 5,200 J 0.45 250 / 7 High High Moderate

MW-188D (228.5) 6.92 39.8 - ND 14.7 3.5 4.4 J 6,700 J 0.33 ND / ND High High Moderate

MW-181C (284.5) 19.79 77.2 1.51 ND ND 0 1,100 ND 0.13 11 / ND - - -

MW-40 13.94 103.8 3.48 1.7 38.1 0.4 ND 100,000 0.1 0.2 J / ND High High High

MW-71 13 74.5 5.66 2.5 21.5 0 ND 64,000 0.03 ND / ND - - -

MW-56A 16.18 191.1 0.05 11.4 27.1 0.5 ND 110,000 1.38 NS - - -

MW-56B 17.19 63.8 2.15 5.9 23.9 0.5 ND 92,000 0.17 0.3 J / ND - - -

MW-56C (310-315) 20.39 64.7 2.08 ND 2.6 J - 520 15,000 - ND / ND - - -

MW-178C 16.99 112.9 7.19 ND 19.1 0 ND 2,800 J 0.21 44 / ND - - -

MW-184 19.11 -95.8 6.59 0.69 23.5 0 ND 3,000 J 0 8 / ND - - -

MW-168 (115) 16.58 120.8 7.25 4.5 7.7 0.5 ND 21,000 0.7 0.5 J / ND - - -

MW-89 16.44 143.7 4.64 13.9 16 0.5 ND 45,000 0.15 1 / ND - - -

MW-82B 15.53 147.9 6.3 8.2 12.3 0.5 ND 19,000 0.21 1 / ND - - -

MW-82D (HS-D) 6.78 -15.7 76.9 ND ND 0.5 910 ND 0.49 110 / 0.5 J - - -

MW-189D (256-258) 16.87 37.4 45.4 0.8 9.6 1.5 ND 24,000 0.05 91 / ND High Moderate High

MW-38 9.46 59.9 - 8 10.1 0.5 ND 23,000 0 8 / ND - - -

MW-38B 15.64 80.4 2.51 2.3 9.3 0.25 ND 15,000 2.37 ND / ND - - -

MW-38C 18.89 56.2 4.47 ND 22.6 0 ND 20,000 0.17 100 / ND - - -

MW-74 21.28 166.9 7.57 10.2 8.5 0 ND ND 0.03 4 / ND - - -

MW-75 20.88 167.2 5.94 8.5 7.4 0 ND 8,300 J 0 4 / ND - - -

MW-42A 17.34 238.9 4.78 1.8 ND 0 ND 18,000 0 NS - - -

MW-42B 21.58 74.4 1.5 ND 120 0 ND 11,000 J 0.16 ND / ND - - -

MW-42C (192) 15.61 10.4 1.47 4.1 16 0 ND 13,000 0 ND / ND - - -

MW-92 17.3 77.6 4.15 7.6 ND 0.5 ND 81,000 0 ND / ND - - -

MW-92A 22.43 157.1 0.42 1.6 15.2 0.5 6 23,000 0.6 ND / ND - - -

MW-92C (210-215) 16.61 54.9 0.07 ND ND 4 41 7,600 J 1.03 ND / ND - - -

7.29

6.84

6.53

7.15

5.78

Distal Plume (Southwest)

6.25

6.28

4.87

6.77

6.58

6.1

4.67

7.83

6.77

6.4

MtBE and benzene from 2019 semi-annual sampling event.

Distal Plume (Northeast)

5.86

5.98

6.12

6.24

7.26

7.44

6.59

5.94

6.3

4.58

6.22

Background / Perimeter (Southwest)

Background / Perimeter (Northeast)

6.14

6.21

6.47

7.63

5.9

7.01

7.44

Plume Core (Station)

5.8

6.07

6.26

6.27

Plume Core (Northeast)

6.71

6.94

6.39

Sulfate

(mg/L)

Ferrous

Iron

(mg/L)

Nitrate

(mg/L)

Release Area (Tank Field and Intersection)

MW pHTemp

(°C)

ORP

(mV)

D.O.

(mg/L)

Methane

(µg/L)

CO2

(µg/L)

Orthophosphate

(mg/L)

QuantArray

(Anaerobic

BTEX)

Table 3 - Natural Attenuation Biodegradation Evaluation Results

Field Parameters Laboratory Analysis (Chemistry) Laboratory Analysis (Microbial)

Conditions Electron Donor / Acceptor Indicators Microbial Indicators

1 of 1

Well ID ORP Well ID ORP

MW-1 163.2 MW-38 59.9

MW-1A 121.1 MW-38B 80.4

MW-2 110.9 MW-38C 56.2

MW-2A 123 MW-38P 108.1

MW-3 117.8 MW-40 103.8

MW-4 167.2 MW-41B 90.4

MW-4A 144.1 MW-41C 63.4

MW-5 92.9 MW-42A 238.9

MW-6 167.1 MW-42B 74.4

MW-7 169.9 MW-42C 10.4

MW-8 159.1 MW-43A 117.1

MW-9 153.1 MW-45 129.3

MW-12 149.4 MW-45P 46.1

MW-13 170.1 MW-45R 123.4

MW-14 190.5 MW-47A 150.2

MW-15 149.9 MW-47B 128.6

MW-16 135.9 MW-47BB 32.1

MW-16R 95.6 MW-47C -44.7

MW-17 182.7 MW-48A 161.4

MW-19 123.5 MW-48B 163.9

MW-21 129.5 MW-48D 53.6

MW-22 128.9 MW-49 99.7

MW-23 133.5 MW-50B 34.8

MW-24 117.3 MW-50C 37.6

MW-25 130.4 MW-52 59.2

MW-26 91.9 MW-53B 9.3

MW-27 80.3 MW-53C 89.7

MW-27B 83.8 MW-54 88.1

MW-27R 79.9 MW-54B 132.3

MW-28 104.7 MW-54C 13.6

MW-29 110.1 MW-56A 191.1

MW-30 111 MW-56B 63.8

MW-31 122.2 MW-56C 53.6

MW-32 64.4 MW-57 257.8

MW-36 79.4 MW-57P 271.1

MW-36C 45.2 MW-58 243.5

MW-36P 128.3 MW-58P 229.2

MW-36R 95.1 MW-58R 219.3

MW-37 95.4 MW-59A 113.8

MW-37P 106.7 MW-59D 127.6

Table 4

ORP Measurements

Table 4

ORP Measurements


MW-60 71.7 MW-94 87.2

MW-61A 117.2 MW-95 100.1

MW-61B 33.8 MW-95B 124.2

MW-62A 73.5 MW-101A 126.6

MW-62B 33.3 MW-101B 110.2

MW-63 67.3 MW-103 175.4

MW-71 74.5 MW-105 94.6

MW-72 85.7 MW-106 162.6

MW-73 61.7 MW-107 247.9

MW-73C -45.7 MW-108 84.1

MW-74 166.9 MW-108 84.1

MW-75 167.2 MW-108 84.1

MW-76 97.3 MW-108 84.1

MW-77A 151 MW-108 84.1

MW-77B 125.2 MW-108 84.1

MW-77R 152.2 MW-108 84.1

MW-80A 99.9 MW-108 84.1

MW-80B 120.5 MW-108 84.1

MW-81 110.3 MW-108 84.1

MW-82 150.3 MW-108 84.1

MW-82B 147.9 MW-108 84.1

MW-82D -15.7 MW-109 89.5

MW-83 162.2 MW-110 84.1

MW-83R 156.5 MW-114 132.1

MW-84 46.9 MW-118 92.4

MW-84P 86.7 MW-119 70.4

MW-85 54.6 MW-121 -125.7

MW-86 56.6 MW-125 111.8

MW-87 148.1 MW-128C -11

MW-88 39.1 MW-132A 121.9

MW-90 106.8 MW-132B 111.7

MW-91 81.7 MW-133A 124.2

MW-91C -112.5 MW-133B 40.5

MW-91D 24.3 MW-133C 38.4

MW-92 77.6 MW-134A 92.3

MW-92A 157.1 MW-134B 89.5

MW-92C 54.9 MW-135A 116.3

MW-93 74.7 MW-135B 113.2

MW-93B 75.5 MW-135C 67.1

MW-93C 66.5 MW-136 116.1

Table 4

ORP Measurements


MW-137 114.4 MW-179C -10

MW-139 118.1 MW-180A 119.9

MW-140B 69.6 MW-180C 78.8

MW-141A 97.8 MW-181A 71

MW-141B 63.6 MW-181B 72.6

MW-141C -54.8 MW-182 -4.9

MW-142 129.4 MW-183 -101.4

MW-143 142.6 MW-184 -95.8

MW-144 111.6 MW-185 -122.3

MW-148A 149.7 MW-186D -5.9

MW-148B 31.9 MW-187A 189.3

MW-150A 73.4 MW-187B 98.1

MW-150B 75 MW-187C 139.9

MW-151 106.1 PW-14311 72.9

MW-154 74.7 PW-3501 129

MW-156 78.1 SVE-1 116.6

MW-159 82.4 SVE-3 160.3

MW-160 112.7

MW-162A 119.2

MW-162B 107.8

MW-164B 165.1

MW-165C 69.9

MW-166B 84.4

MW-166C 58.5

MW-167 57.9

MW-169 112.3

MW-170 114.1

MW-171 62.7

MW-171C 18.6

MW-173B 62.9

MW-174B 67.2

MW-174C 6.3

MW-175C -126.8

MW-176 117.9

MW-176CC 39.8

MW-177 -65.9

MW-178A 108.4

MW-178B 86.9

MW-179A 127.1

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MW-175C

MW-174BMW-174C

MW-133C

MW-135C

MW-91C

MW-176 MW-177

MW-171C

MW-178A

MW-178BMW-178C MW-91D

MW-47BBMW-47C

MW-179CMW-179A

MW-180AMW-180C

MW-36C

MW-9

MW-8

MW-7

MW-6

MW-5

MW-4

MW-2

MW-1

PW-01

MW-93

MW-92

MW-94

MW-95

MW-91

MW-90

MW-89

MW-88

MW-87

MW-86

MW-85

MW-84

MW-83

MW-82

MW-81

MW-79

MW-76

MW-75

MW-97

MW-74

MW-73

MW-72

MW-71

MW-70MW-68

MW-69 MW-65

MW-64

MW-63

MW-66

MW-67

MW-60

MW-58

MW-4A

MW-2A

MW-1A

MW-57

MW-54

MW-55

MW-52

MW-51

MW-50

MW-49

MW-46

MW-45

MW-44

MW-40

MW-39

MW-37

MW-36

MW-35

MW-34

MW-33

MW-38

MW-32

MW-31

MW-30

MW-29 MW-28

MW-27

MW-26

MW-25

MW-24

MW-23

MW-22

MW-21

MW-20

MW-19MW-17

MW-16

MW-15

MW-3PMW-13

MW-12

MW-11

MW-6P

MW-154

MW-155MW-156

MW-161

MW-160

MW-152

MW-149

MW-147

MW-84P

MW-50C

MW-146

MW-143

MW-142

MW-56B

MW-30P

MW-96B

MW-139

MW-138

MW-137

MW-136

POND01

MW-33P

MW-78B

MW-130

MW-98B

MW-80B

MW-110

MW-88P

MW-76P

MW-109

MW-83R

MW-87P

MW-86PMW-85P

MW-77R

MW-82R

MW-57P

MW-106

MW-103 MW-104

MW-105

MW-78A

MW-80AMW-77A

MW-99A

MW-102

MW-98A

MW-96A

MW-41C

MW-56C

MW-62A

MW-61BMW-61AMW-59B

MW-59A

MW-53C

MW-48AMW-48B

MW-43AMW-43B

MW-47BMW-47A

MW-42BMW-42A

MW-41BMW-41A

MW-53BMW-53A

MW-107

MW-108

MW-78R

MW-127

MW-126

MW-125

MW-124

MW-123

MW-122

MW-45P

MW-121

MW-120

MW-119

MW-115

MW-117MW-112

MW-111

MW-113

MW-114

MW-38P

MW-36P

MW-157P

PW-3501

MW-153B

MW-153A

MW-150BMW-150A

MW-148BMW-148A

MW-145P

MW-141A

MW-134B

MW-140AMW-140B

MW-135AMW-135B

MW-134A

MW-132B

MW-131B

MW-133A

MW-131A

MW-128B

MW-129B

MW-129A

MW-128A

MW-101BMW-101A

PW-14311

STREAM04

STREAM03

STREAM02

STREAM01

MW-78C

MW-3

MW-14

MW-10

MW-159

MW-151MW-144

MW-34P

MW-59D

MW-77B

MW-99B

MW-62B

MW-56A

MW-27PMW-13P

MW-58P

MW-37P

MW-118

MW-116

MW-158P

MW-141BMW-141C

MW-132A

MW-133B

MW-100BMW-100A

MW-147PCMW-147PAMW-147PB

MW-93B

MW-93C

MW-165C

MW-92AMW-92C

MW-166AMW-166B

MW-164B

MW-42C

MW-95B

MW-131C

MW-166C

MW-27R

MW-16R

MW-50B

MW-128C

MW-163B

MW-162CMW-162B

MW-162A

MW-45R

MW-168

MW-167

MW-58R

SVE-2

SVE-1

SVE-3

MW-170MW-171

MW-169

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MW-38CMW-38B

MW-54BMW-54C

MW-183 MW-184 MW-185

MW-176CC

MW-182

MW-186D

MW-48D

MW-146B

MW-73C

MW-27B

MW-188D

MW-138D

MW-146C

MW-82B

MW-187AMW-187BMW-187C

MW-82D

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MW-18

3499SWEET AIR

3500SWEET AIR

3430SWEET AIR

3612JACKSON CABIN

14414KATIE

14335JARRETTSVILLE

14330JARRETTSVILLE

3605DSOUTHSIDE

14210ROBCASTE

14217ROBCASTE

3320PAPER MILL

14223ROBCASTE

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14406KATIE

14208ROBCASTE

3224PAPER MILL

14412KATIE

14225ROBCASTE

14303ROBCASTE

14219ROBCASTE

14408KATIE

14221ROBCASTE

14214ROBCASTE

14302ROBCASTE

14305ROBCASTE

3313PAPER MILL

14403KATIE

3606HAMPSHIRE GLEN

3235PAPER MILL

14405KATIE

3422SWEET AIR

14209ROBCASTE

14215ROBCASTE

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14213ROBCASTE

3525SOUTHSIDE

14206ROBCASTE

14211ROBCASTE

3506SWEET AIR

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3604HAMPSHIRE GLEN

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3611JACKSON CABIN

14410KATIE

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14300ROBCASTE

3301PAPER MILL

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3616JACKSON CABIN

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www.kleinfelder.com

SITE PLANAS OF MARCH 31, 2019INACTIVE EXXON FACILITY #28077

14258 JARRETTSVILLE PIKEPHOENIX, MARYLANDBALTIMORE COUNTY

201831464/19/2019B. MyersC. Low

£

1The information included on this graphic representation has been compiled from a variety of sources and is subject to change without notice. Kleinfelder makes no representations or warranties, express or implied, as to accuracy, completeness, timeliness, or rights to the use of such information. This document is not intended for use as a land survey product nor is it designed or intended as a construction design document. The use or misuse of the information contained on this graphic representation is at the sole risk of the party using or misusing the information.

1340 Charwood Road, Suite IHanover, Maryland 21076t | 866.862.9760f | 410.850.0049

FIGURE

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www.kleinfelder.com

£

LegendMTBE Concentrations (µg/L)") ND(RL ≤1.0) - 1.0") >1.0 - <20") >20! Not S am pled( M onitoring Only* Recovery ActivityD Private S upply W ell

Groundwater Recovery ZonesZ one 1Z one 2Z one 3Parcel Boundary (Approx.)Building Foot PrintsS tream sW ater Bodies

NOT ES :1. LOCAT IONS W IT H DEPT H INT ERVAL S AM PLES DIS PLAY LABEL FOR M AX . M T BE CONCENT RAT ION. IF AL L INT ERVAL S ARE "ND(RL)", LABEL W IL L BE DEFAULT ED T O T HE M OS T S HAL L OW INT ERVAL2. M W -99B, M W -78B, M W -78C, M W -78R W ERE FLOODED AT T HE T IM E OF S AM PLING

GROUNDW AT ER RECOVERY Z ONES :Z ONE 1: M W -37, M W -38, M W -38C, M W -54B, M W -74,M W -75, M W -82B, M W -82R, M W -89, M W -178CZ ONE 2:M W -59B, M W -91C, M W -169, M W -170, M W -176,M W -183, M W -184, M W -185Z ONE 3:M W -45, M W -45R, M W -121, M W -181A

EAST GROUNDWATERCONCENTRATION MAPINACT IVE EX X ON FACILIT Y #2807714258 JARRET T S VIL LE PIKEPHOENIX , M ARY LANDBALT IM ORE COUNT Y

201930117/17/2019B. M y ersB. Haffey

\\azrgisstorp01\GIS _Projects\Client\EM ES _M D_Phoenix\M X D\CAP_M eeting_2019\Fig2_East_GW _Con_M ap071719.m xd

2aT he inform ation included on this graphic representation has been com piled from a variety of sources and is subject to change without notice. Kleinfelder m akes no representations or warranties, express or im plied, as to accuracy, com pleteness, tim eliness, or rights to the use of such inform ation. T his docum ent is not intended for use as a land survey product nor is it designed or intended as a construction design docum ent. T he use or m isuse of the inform ation contained on this graphic representation is at the sole risk of the party using or m isusing the inform ation.

FIGUREPROJECT NO.DRAW N:DRAW N BY :CHECKED BY :FILE NAM E:

0 90 18045Feet

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www.kleinfelder.com

£

LegendMTBE Concentrations (µg/L)") ND(R L≤1.0) - 1.0") >1.0 - <20") >20! Not S ampled( Monitoring Only* R ecovery ActivityD P rivate S upply W ell

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GR OUNDW ATER R ECOV ER Y ZONES :ZONE DIS P ENS ER IS LAND: MW -1A, MW -2A, MW -19, MW -21, MW -22, MW -23, MW -139,MW -151, MW -152, MW -187A, MW -187B, S V E-1, S V E-2, S V E-3ZONE DP E:MW -3, MW -4, MW -6, MW -7, MW -13, MW -16, MW -16R ,MW -27, MW -27R

Th e information included on th is graph ic representation h as been compiled from a variety of sources and is subject to ch ange with out notice. K leinfelder makes no representations or warranties, ex press or implied, as to accuracy, completeness, timeliness, or righ ts to th e use of such information. Th is document is not intended for use as a land survey product nor is it designed or intended as a construction design document. Th e use or misuse of th e information contained on th is graph ic representation is at th e sole risk of th e party using or misusing th e information.

0 90 18045Feet

WEST GROUNDWATERCONCENTRATION MAPINACTIV E EX X ON FACILITY #2807714258 JAR R ETTS V ILLE P IK EP HOENIX , MAR Y LANDBALTIMOR E COUNTY

1340 Ch arwood R oad, S uite IHanover, Maryland 21076t | 866.862.9760f | 410.850.0049\\azrgisstorp01\GIS _P rojects\Client\EMES _MD_P h oenix \MX D\CAP _Meeting_2019\Fig3_W est_GW _Con_Map071719.mx d

B. HaffeyB. Myers

7/17/201920193011 FIGUR E

2b

P R OJECT NO.DR AW N:

DR AW N BY :CHECK ED BY :FILE NAME:

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3313AP AP ER MILL


JARR

ETTS

VILLE

PIKE

HAMPSHIRE KNOB

DRIVE

PAPERMILL ROAD

SWEET AIR

ROAD

HAMPSHIRE

GLEN COURT

ROBC

ASTE

ROA

D

JACKSONCABIN ROAD

KATIE ROAD

HAMP

SHIR

E KN

OB D

RIVE

JACKSONCABIN ROAD

ROBCASTE

ROAD

JARR

ETTS

VILL

EPIK

E

JACKSON CABIN14207

ROBCASTE

14412KATIE

14300ROBCASTE

3527SOUTHSIDE

3605DSOUTHSIDE

3611SOUTHSIDE

14211ROBCASTE

14408KATIE

14209ROBCASTE

3506HAMPSHIRE

GLEN

3612HAMPSHIRE

GLEN

3413SWEET AIR

14205ROBCASTE

3313PAPER

MILL

3224PAPER

MILL

14225ROBCASTE

3501SWEET AIR

14351HAMPSHIRE

KNOB

14219ROBCASTE

14301JARRETTSVILLE

3526SWEET AIR

3300PAPER

MILL

3605SOUTHSIDE

3605ASOUTHSIDE

14223ROBCASTE

3610HAMPSHIRE

GLEN

3608HAMPSHIRE

GLEN

14221ROBCASTE

3499SWEET AIR

14243JARRETTSVILLE

14315JARRETTSVILLE

14304ROBCASTE

14342JARRETTSVILLE

3604HAMPSHIRE

GLEN

3306PAPER

MILL

3603HAMPSHIRE

GLEN

JARRETTSVILLE

14414KATIE

3609HAMPSHIRE

GLEN

14202JARRETTSVILLE

14302ROBCASTE

3235PAPER

MILL

14330JARRETTSVILLE

3502HAMPSHIRE

GLEN

3518SWEET AIR

3430SWEET AIR

1441

8KA

TIE

14307ROBCASTE

14213ROBCASTE

3505HAMPSHIRE

GLEN

3418SWEET AIR

14307JARRETTSVILLE

14258JARRETTSVILLE

3506SWEET AIR

3305PAPER

MILL

14406KATIE

ROBCASTE

3609JACKSON

CABIN

3620JACKSON

CABIN

3505SWEET AIR

14311JARRETTSVILLE

14217ROBCASTE

3605BSOUTHSIDE

3601JACKSON

CABIN

14231JARRETTSVILLE

14227JARRETTSVILLE

SWEET AIR

3611JACKSON

CABIN

3529SOUTHSIDE

3510SWEET AIR

14204ROBCASTE

1440

9KA

TIE

3500HAMPSHIRE

GLEN

14202ROBCASTE

14214JARRETTSVILLE

3503HAMPSHIRE

GLEN

3602HAMPSHIRE

GLEN

14206ROBCASTE

14335JARRETTSVILLE

3504HAMPSHIRE

GLEN

3422SWEET AIR

14222JARRETTSVILLE

3614HAMPSHIRE

GLEN

14345JARRETTSVILLE


3301PAPER

MILL3607

HAMPSHIREGLEN

14405KATIE

14237JARRETTSVILLE

3610JACKSON

CABIN

14215ROBCASTE

3605CSOUTHSIDE

14308ROBCASTE

14305ROBCASTE

14240JARRETTSVILLE

14210ROBCASTE

14303ROBCASTE

3603JACKSON

CABIN

14232JARRETTSVILLE

3320PAPER

MILL

3615JACKSON

CABIN

3411SWEET AIR

3627SOUTHSIDE

14416KATIE

3500SWEET AIR

3608SWEET AIR

3525SOUTHSIDE

14212JARRETTSVILLE

3600HAMPSHIRE

GLEN

3606HAMPSHIRE

GLEN

3607JACKSON

CABIN

14200ROBCASTE

3602JACKSON

CABIN

3627ASOUTHSIDE

3226PAPER

MILL

14355HAMPSHIRE

KNOB

3616JACKSON

CABIN

14352HAMPSHIRE

KNOB

14407KATIE

3615SOUTHSIDE

3612JACKSON

CABIN

14306ROBCASTE

3618JACKSON

CABIN

3617JACKSON

CABIN

14208ROBCASTE

14214ROBCASTE

14228JARRETTSVILLE

3605HAMPSHIRE

GLEN

3604JACKSON

CABIN

3512SWEET AIR

3606JACKSON

CABIN

3507HAMPSHIRE

GLEN

14410KATIE

14209JARRETTSVILLE

3605JACKSON

CABIN

14320JARRETTSVILLE

14403KATIE

3530SWEET AIR

3410SWEET AIR

3501HAMPSHIRE

GLEN

3608JACKSON

CABIN

3440SWEET AIR

3510HAMPSHIRE

GLEN

3508HAMPSHIRE

GLEN

3313APAPER MILL

3507SWEET AIR

14242JARRETTSVILLE

1430

0JA

RRET

TSVI

LLE

14333JARRETTSVILLE

www.kleinfelder.com

ORP SAMPLE RESULTS 2019(SHALLOW)

INACTIVE EXXON FACILITY #2807714258 JARRETTSVILLE PIKE

PHOENIX, MARYLANDBALTIMORE COUNTY

201930117/16/2019B. Myers

S. Schiding

£



FIGURE

LegendORP (mV)!( <-100 mV

!( -10 to -100 mV!( 0 to -10 mV!( 0 to +10 mV

!( +10 to +100 mV

!( >+100 mVBuilding FootprintProperty Boundary (Approx.)Roads and ParkingRetention BasinStreamIntermittentWater Body

0 120 240 360 480Feet

\\azrgisstorp01\GIS_Projects\Client\EMES_MD_Phoenix\MXD\CAP_Meeting_2019\ORP_Dist_Map_Shallow.mxd

NOTE: Immovable remedial equipment at MW-59B and MW-155 (inactive pneumatic pumps). MW-189D location is approximate


ORP (mV)

NOTES:ORP = Oxidation-Reduction PotentialmV = millivolts

SSchiding

Text Box

3a

MW-166C58.5

MW-128C-11

MW-169112.3

MW-170114.1

MW-92C54.9

MW-53C89.7

MW-56C53.6

MW-41C63.4

MW-141C-54.8

MW-50C37.6

PW-3501129

PW-1431172.9

MW-93C66.5

MW-165C69.9

MW-42C10.4

MW-133C38.4

MW-162C5.7

MW-135C67.1

MW-174C6.3

MW-91C-112.5

MW-177-65.9

MW-171C18.6

MW-47C-44.7

MW-180C78.8

MW-179C-10

MW-36C45.2

MW-38C56.2

MW-184-95.8

MW-183-101.4

MW-182-4.9

MW-176CC39.8

MW-54C13.6

MW-185-122.3

MW-171C(159.5)-142.7

MW-175C-126.8

MW-176117.9

MW-187C139.9

MW-186D-5.9

MW-48D53.6

MW-73C-45.7

MW-82D-15.7

JARR

ETTS

VILLE

PIKE

HAMPSHIRE KNOB

DRIVE

PAPERMILL ROAD

SWEET AIR

ROAD

HAMPSHIRE

GLEN COURT

ROBC

ASTE

ROA

D

JACKSONCABIN ROAD

KATIE ROAD

HAMP

SHIR

E KN

OB D

RIVE

JACKSONCABIN ROAD

ROBCASTE

ROAD

JARR

ETTS

VILL

EPIK

E

JACKSON CABIN14207

ROBCASTE

14412KATIE

14300ROBCASTE

3527SOUTHSIDE

3605DSOUTHSIDE

3611SOUTHSIDE

14211ROBCASTE

14408KATIE

14209ROBCASTE

3506HAMPSHIRE

GLEN

3612HAMPSHIRE

GLEN

3413SWEET AIR

14205ROBCASTE

3313PAPER

MILL

3224PAPER

MILL

14225ROBCASTE

3501SWEET AIR

14351HAMPSHIRE

KNOB

14219ROBCASTE

14301JARRETTSVILLE

3526SWEET AIR

3300PAPER

MILL

3605SOUTHSIDE

3605ASOUTHSIDE

14223ROBCASTE

3610HAMPSHIRE

GLEN

3608HAMPSHIRE

GLEN

14221ROBCASTE

3499SWEET AIR

14243JARRETTSVILLE

14315JARRETTSVILLE

14304ROBCASTE

14342JARRETTSVILLE

3604HAMPSHIRE

GLEN

3306PAPER

MILL

3603HAMPSHIRE

GLEN

JARRETTSVILLE

14414KATIE

3609HAMPSHIRE

GLEN

14202JARRETTSVILLE

14302ROBCASTE

3235PAPER

MILL

14330JARRETTSVILLE

3502HAMPSHIRE

GLEN

3518SWEET AIR

3430SWEET AIR

1441

8KA

TIE

14307ROBCASTE

14213ROBCASTE

3505HAMPSHIRE

GLEN

3418SWEET AIR

14307JARRETTSVILLE

14258JARRETTSVILLE

3506SWEET AIR

3305PAPER

MILL

14406KATIE

ROBCASTE

3609JACKSON

CABIN

3620JACKSON

CABIN

3505SWEET AIR

14311JARRETTSVILLE

14217ROBCASTE

3605BSOUTHSIDE

3601JACKSON

CABIN

14231JARRETTSVILLE

14227JARRETTSVILLE

SWEET AIR

3611JACKSON

CABIN

3529SOUTHSIDE

3510SWEET AIR

14204ROBCASTE

1440

9KA

TIE

3500HAMPSHIRE

GLEN

14202ROBCASTE

14214JARRETTSVILLE

3503HAMPSHIRE

GLEN

3602HAMPSHIRE

GLEN

14206ROBCASTE

14335JARRETTSVILLE

3504HAMPSHIRE

GLEN

3422SWEET AIR

14222JARRETTSVILLE

3614HAMPSHIRE

GLEN

14345JARRETTSVILLE


3301PAPER

MILL

3607HAMPSHIRE

GLEN

14405KATIE

14237JARRETTSVILLE

3610JACKSON

CABIN

14215ROBCASTE

3605CSOUTHSIDE

14308ROBCASTE

14305ROBCASTE

14240JARRETTSVILLE

14210ROBCASTE

14303ROBCASTE

3603JACKSON

CABIN

14232JARRETTSVILLE

3320PAPER

MILL

3615JACKSON

CABIN

3411SWEET AIR

3627SOUTHSIDE

14416KATIE

3500SWEET AIR

3608SWEET AIR

3525SOUTHSIDE

14212JARRETTSVILLE

3600HAMPSHIRE

GLEN

3606HAMPSHIRE

GLEN

3607JACKSON

CABIN

14200ROBCASTE

3602JACKSON

CABIN

3627ASOUTHSIDE

3226PAPER

MILL

14355HAMPSHIRE

KNOB

3616JACKSON

CABIN

14352HAMPSHIRE

KNOB

14407KATIE

3615SOUTHSIDE

3612JACKSON

CABIN

14306ROBCASTE

3618JACKSON

CABIN

3617JACKSON

CABIN

14208ROBCASTE

14214ROBCASTE

14228JARRETTSVILLE

3605HAMPSHIRE

GLEN

3604JACKSON

CABIN

3512SWEET AIR

3606JACKSON

CABIN

3507HAMPSHIRE

GLEN

14410KATIE

14209JARRETTSVILLE

3605JACKSON

CABIN

14320JARRETTSVILLE

14403KATIE

3530SWEET AIR

3410SWEET AIR

3501HAMPSHIRE

GLEN

3608JACKSON

CABIN

3440SWEET AIR

3510HAMPSHIRE

GLEN

3508HAMPSHIRE

GLEN

3313APAPER MILL

3507SWEET AIR

14242JARRETTSVILLE

1430

0JA

RRET

TSVI

LLE

14333JARRETTSVILLE

www.kleinfelder.com

ORP SAMPLE RESULTS 2019(DEEP)

INACTIVE EXXON FACILITY #2807714258 JARRETTSVILLE PIKE

PHOENIX, MARYLANDBALTIMORE COUNTY

201930117/16/2019B. Myers

S. Schiding

£



FIGURE

LegendORP (mV)!( <-100 mV

!( -10 to -100 mV!( 0 to -10 mV!( 0 to +10 mV

!( +10 to +100 mV

!( >+100 mVBuilding FootprintProperty Boundary (Approx.)Roads and ParkingRetention BasinStreamIntermittentWater Body

0 120 240 360 480Feet

\\azrgisstorp01\GIS_Projects\Client\EMES_MD_Phoenix\MXD\CAP_Meeting_2019\ORP_Dist_Map.mxd

NOTE: Immovable remedial equipment at MW-59B and MW-155 (inactive pneumatic pumps). MW-189D location is approximate


ORP (mV)

NOTES:ORP = Oxidation-Reduction PotentialmV = millivolts

SSchiding

Text Box

3b

SSchiding

Text Box

Figure 4a

SSchiding

Text Box

Figure 4b

SSchiding

Image

SSchiding

Text Box

Figure 4c

SSchiding

Text Box

Figure 4d

SSchiding

Text Box

Figure 4e

SSchiding

Text Box

Figure 4f

SSchiding

Text Box

Figure 4g

SSchiding

Text Box

Figure 4h

Documents

NATURAL ATTENUATION EVALUATION REPORT