Phase IV Completion_ROS Opinion_2016

135659/FRM16R48263_01-JE4/PH IV-ROS Opinion 10-16 Page 1 of 2
1 Speen Street, Framingham, MA 01701 p | 508.370.8256 f | 508-628-1401
Electronic Submittal
October 18, 2016
Massachusetts Department of Environmental Protection
Northeast Regional Office
205B Lowell Street
Wilmington, Massachusetts 01887
Re: Phase IV Completion Statement, Remedy Operation Status Opinion, and
Substantial Hazard Evaluation
Former Mobil Station #01-JE4
99 Worcester Road
Natick, Massachusetts
MassDEP RTN 3-0715
To Whom It May Concern:
Kleinfelder, on behalf of ExxonMobil Environmental Services Company (EMES), has prepared
the enclosed Phase IV Completion Statement, Remedy Operation Status (ROS) Opinion, and
Substantial Hazard Evaluation (SHE). The applicable Bureau of Waste Site Cleanup (BWSC)
Forms 108 and 108A have been filed electronically via eDEP for the above-referenced submittal.
The objective of this report is to demonstrate that the remedial alternative selected in the Phase
IV Remedy Implementation Plan (RIP) Modification submitted to the Massachusetts Department
of Environmental Protection (MassDEP) in June 2015, has been implemented in accordance with
the requirements and procedures set forth in 310 CMR 40.0000, the Massachusetts Contingency
Plan (MCP). In addition, based on the results of the Comprehensive Remedial Action (enhanced
bioremediation using BOS 200® followed by monitored natural attenuation), the site meets the
performance standards for ROS specified at 310 CMR 40.0893(2).
The attached documents have been prepared under the direction of Licensed Site Professional
(LSP) Mr. Eric Henry (LSP # 9814). The EMES representative overseeing response actions
associated with this submittal is Ms. Colby Jensen, 38 Varick St, Brooklyn, NY, 11222; she may
be reached by telephone at (718) 404-0653.

135659/FRM16R48263_01-JE4/PH IV-ROS Opinion 10-16 Page 2 of 2
Should you have any questions, please do not hesitate to contact the undersigned at (508) 370-
8256.
Sincerely,
KLEINFELDER
Jeremy E. Blumberg, CHMM Eric Henry, LSP, LEP
Project Manager Principal Hydrogeologist
cc: Ms. Colby Jensen, ExxonMobil Environmental Services Company (file)
Mr. Richard Jennett Jr., Board of Selectman, 13 East Central Street, Natick, MA, 01760
(cover letter only)
Mr. James M. White, Jr., Natick Health Department, 13 East Central Street, Natick, MA
01760 (cover letter only)

PHASE IV COMPLETION STATEMENT, REMEDY OPERATION STATUS OPINION,
AND SUBSTANTIAL HAZARD EVALUATION
Former Mobil Station #01-JE4
99 Worcester Road
MassDEP RTN 3-0715
October 2016
Kleinfelder
1 Speen Street, Suite 200
Framingham, Massachusetts 01701
(508) 370-8256

135659/FRM16R48263 Page ii of iv October 18, 2016
A Report Prepared for:
ExxonMobil Environmental Services Company
38 Varick Street
Brooklyn, NY, 11222
PHASE IV COMPLETION STATEMENT,
REMEDY OPERATION STATUS OPINION,
AND SUBSTANTIAL HAZARD EVALUATION
Former Mobil Station # 01-JE4
99 Worcester Road
MADEP RTN 3-0715
Kleinfelder Job No. 135659
Prepared by:
_________________________________________________________________________________________
Ryan Degnim
Staff Professional
Reviewed by:
_________________________________________________________________________________________
Jeremy Blumberg, CHMM
Project Manager
_________________________________________________________________________________________
Eric Henry, LSP, LEP
Principal Hydrogeologist
Kleinfelder
1 Speen Street, Suite 200
Framingham, Massachusetts 01701

135659/FRM16R48263 Page iii of iv October 18, 2016
TABLE OF CONTENTS
LIST OF APPENDICES ............................................................................................................ IV
1.0 INTRODUCTION.............................................................................................................1
1.1 Background and Regulatory Status......................................................................1
1.2 General Site Description and Use History ............................................................4
2.0 POTENTIAL RECEPTORS AND EXPOSURE PATHWAY ............................................5
2.1 Potential Sensitive Receptors ..............................................................................5
2.2 Surface Water and Wetlands ...............................................................................5
2.3 Potable Water Supplies........................................................................................5
2.4 Schools and Institutions .......................................................................................5
2.5 Other Potential Sensitive Receptors.....................................................................5
3.0 IMPLEMENTATION OF COMPREHENSIVE RESPONSE ACTIONS.............................6
3.1 BOS 200® Injections............................................................................................6
3.2 Groundwater Monitoring Activity ..........................................................................6
3.2.1 Baseline Conditions..................................................................................7
3.2.2 Post-injection Conditions..........................................................................7
4.0 PHASE IV COMPLETION STATEMENT ........................................................................9
5.0 SUBSTANTIAL HAZARD EVALUATION .....................................................................10
5.1 Applicability of Soil and Groundwater Standards................................................10
5.2 Soil Conditions...................................................................................................11
5.3 Groundwater Conditions ....................................................................................11
5.4 Exposure Pathway Evaluation............................................................................12
5.4.1 Soil Contact............................................................................................12
5.4.2 Groundwater Ingestion ...........................................................................13
5.4.3 Volatilization ...........................................................................................13
5.4.4 Ecological Risk Evaluation .....................................................................13
5.4.5 Utility Workers ........................................................................................14
5.5 Findings of Substantial Hazard Evaluation.........................................................14
6.0 REMEDY OPERATION STATUS OPINION..................................................................15
6.1 Future Remedial Actions....................................................................................15
6.2 Reporting ...........................................................................................................16
6.3 Future Course of Action .....................................................................................16
7.0 LIMITATIONS ...............................................................................................................17
8.0 REFERENCES..............................................................................................................18

135659/FRM16R48263 Page iv of iv October 18, 2016
LIST OF APPENDICES
Figures
1 – Site Location Map
2 – Site Plan
3 – Priority Resource Map
4 – BOS 200® Remedial Injection Treatment Map
5 – Site Plan and Historical Groundwater Flow Direction – BTEX and MTBE (5/27/2016)
Tables
1 – Injection Related Groundwater Monitoring Parameters
2 – Gauging & Groundwater Sample Analytical Results – Volatile Petroleum Hydrocarbons
3 – Groundwater Sample Analytical Results – Volatile Organic Compounds
4 – Groundwater Sample Analytical Results – Natural Attenuation Parameters
5 – Level 1 Soil Vapor Screening Results
Appendices
A – Complete Laboratory Reports
B – Public Notification Letters
C – Historical Soil and Groundwater Analytical Data

135659/FRM16R48263 Page 1 of 18 October 18, 2016
1.0 INTRODUCTION
Kleinfelder, on behalf of ExxonMobil Environmental Services Company (EMES), has prepared this
Phase IV Completion Statement, Remedy Operation Status (ROS) Opinion, and Substantial
Hazard Evaluation (SHE) for former Mobil Service Station No. 01-JE4 located at 99 Worcester
Road in Natick, Massachusetts, associated with the Release Tracking Number (RTN) 3-0715 (the
site). Refer to Figure 1 for the regional location and Figures 2 through 8 for pertinent site features.
This report has been prepared in accordance with the applicable provisions of the Massachusetts
Contingency Plan (MCP), 310 CMR 40.0000. The Phase IV activities have been completed
pursuant to the provisions set forth in 310 CMR 40.0800 for Comprehensive Response Actions.
The continued operation, maintenance and monitoring of the Comprehensive Remedial Alternative
(enhanced bioremediation using BOS 200® followed by monitored natural attenuation (MNA)) will
be conducted at this site under the ROS provisions set forth in 310 CMR 40.0890 for the purpose
of achieving a Permanent Solution. A SHE has been conducted in support of the ROS to
demonstrate that a condition of No Substantial Hazard exists at the site.
1.1 Background and Regulatory Status
The information in the following section was obtained directly or summarized from the Revised
Class C-1 RAO Statement submitted by Camp, Dresser, and McKee, Inc. (CDM) in December
2009.
Amoco reported petroleum-affected soil and groundwater to the Massachusetts Department of
Environmental Protection (MassDEP) following a subsurface investigation in November 1986. The
MassDEP listed the site as a Location To Be Investigated on January 15, 1990 and issued Mobil
a Notice of Responsibility on May 29, 1991. On July 15, 1991, the site was listed as a Non-Priority
Confirmed Disposal Site with MassDEP RTN 3-0715 assigned to the site.
On May 28, 1991, an Interim Measure was approved by the MassDEP involving the installation,
implementation, and operation of a groundwater recovery and treatment system and a soil vapor
extraction (SVE) system. In May 1992, Mobil was granted a Waiver of Approvals by the MassDEP.
Mobil received a “Notice of Audit: Request for Information” letter from the MassDEP on February
28, 1994 indicating a violation because the Request of Information response was past the 30-day
deadline. No further action was taken.

On May 7, 1997, the Waiver of Approvals expired.
In 1999, Groundwater & Environmental Services Inc. (GES) conducted a MassDEP database
search and file review and determined that an RAO for the subject property was completed by
LandTech Remedial in September 1997 but never submitted to MassDEP. In 2001, CDM
conducted another MassDEP file review and found no evidence of the LandTech RAO submittal.
On February 20, 2000 GES submitted a Tier II Extension Request to MassDEP.
GES detected 2.64 feet of light non-aqueous phase liquid (LNAPL) in monitoring well OW-7.
MassDEP was notified of the 72-hour reportable condition on February 25, 2000 and MassDEP
issued RTN 3-19321 to the site. On April 21, 2000, GES submitted an Immediate Response Action
(IRA) Plan to gauge and bail monitoring well OW-7 to recover detected LNAPL. IRA Status
Reports were submitted by GES on June 28 and December 28, 2000, and Parsons submitted an
IRA Status Report on April 9, 2001.
Parsons submitted a Phase II Scope of Work on April 9, 2001 and a Tier II Extension request on
May 23, 2001 to the MassDEP.
On September 4th, 2001 CDM submitted a Phase I Initial Site Investigation and a Tier
Classification with a score of 202 resulting in a Tier II Classification for the site.
CDM submitted an IRA Amendment in October 2001 and IRA Status Reports in October 2001,
April and October 2002, April and October 2003. An IRA Completion Report was submitted on
April 12, 2004 to the MassDEP.
In January 2002, CDM submitted a Phase II Comprehensive Site Assessment (CSA). A Revised
Phase II CSA and a Phase III RAP were submitted on July 21, 2004 to the MassDEP. The Phase
II revision was to correct the groundwater classification from GW-2/GW-3 to GW-1. Enhanced in-
situ bioremediation was determined as the most effective remedial alternative in the Phase III RAP.
In July 2004, a Phase IV RIP was submitted to the MassDEP by CDM proposing the use of Oxygen
Release Compound (ORC®) as the approach to remediate the elevated levels of gasoline
constituents in the site’s groundwater. In July 2004, CDM oversaw the injection of ORC® into the
subsurface. CDM submitted a Phase IV Final Inspection Report (FIR) and Completion Report,
and Phase V ROS submittal in August 2004.

To maintain ROS, CDM submitted Inspection and Monitoring Reports in February, August 2005,
and February 2006. In August 2006, CDM submitted a Class C-1 RAO Statement to the MassDEP,
based on the determination that a Temporary Solution and condition of No Substantial Hazard had
been achieved for the site, and that a Permanent Solution was not currently feasible. CDM
concurrently submitted a Final Phase V Inspection Monitoring Report to the MassDEP with the
submittal of the Class C-1 RAO.
In September 2008, MassDEP was notified of LNAPL detected in monitoring well OW-7. MassDEP
did not issue a new RTN but gave verbal approval of the IRA Plan involving weekly gauging and
bailing of the LNAPL. Weekly events included gauging and bailing of OW-7 as well as gauging of
ten on-site wells. LNAPL in OW-7 decreased from 0.37 feet to 0.01 feet within the first three weeks
with no measureable product detected for the four subsequent weeks of gauging. Additionally,
LNAPL was not detected in any of the 10 on-site wells.
In November 2008, an IRA Modification Plan was submitted modifying the gauging frequency from
weekly to bi-weekly by CDM. IRA Status Reports were submitted January and July 2009 and an
IRA Completion report was submitted in December 2009 by CDM.
CDM submitted Post Class C RAO Status Reports to the MassDEP in June and December 2010,
and June 2011.
Kleinfelder submitted Class C-1 Post Response Action Outcome (PRAO) Status Reports on
December 9, 2011 and June 18, 2012.
On July 16, 2012, Kleinfelder retracted the Class C RAO and submitted a Phase III RAP, Phase
IV RIP, and Tier II Extension. The Phase IV RIP outlined plans for the application of ISCO as an
alternative and more aggressive approach to achieve a Permanent Solution at the site.
Kleinfelder submitted a Phase IV Completion Statement, and ROS with Substantial Hazard
Evaluation (SHE) on January 7, 2012. The Phase IV Completion Statement detailed the
implementation of ISCO at the site, and summarized the results of the Comprehensive Response
Action which met performance standards for ROS.
Kleinfelder submitted ROS status reports in May 2013, December 2013, June 2014, January 2015,
and July 2015 summarizing groundwater monitoring activities and evaluating ROS.

In October 2015 Kleinfelder submitted a ROS Termination, Phase III RAP, Phase IV RIP, and Tier
II Extension selecting the Comprehensive Response Action of enhanced bioremediation using
BOS 200 ® followed by MNA and detailing its implementation. In March 2016 Kleinfelder submitted
a Phase IV RIP Status report summarizing monitoring well repairs conducted during the reporting
period and proposing a schedule for implementing the selected remedial alternative.
1.2 General Site Description and Use History
The subject property is located on the Town of Natick Assessor’s Map 21, Lot 309. The property
is currently owned and operated by Jiffy Lube as an automotive service facility. The site is
approximately 0.15 acres on the northern side of Worcester Road (Route 9), refer to Figures 1 and
2 for site and surrounding features. The subject and surrounding properties are zoned for business
use.
The site is improved by a single story building currently operated as a Jiffy Lube service facility.
The majority of the property is paved with landscaped areas along the eastern, southwestern, and
northwestern perimeters of the property. A landscaped area is also located southwest of the site
building. The property is served by underground water and sewer, which enter along the southern
portion of the site building from Worcester Road. The property is also serviced by gas and
overhead electric and telephone service entering from the southeast corner of the site building.

2.0 POTENTIAL RECEPTORS AND EXPOSURE PATHWAY
2.1 Potential Sensitive Receptors
Kleinfelder personnel reviewed available data to determine potential receptors including but not
limited to humans, subsurface utility conduits, potable water supplies, surface water bodies, natural
resource areas, schools and institutions, and buildings in the vicinity of the subject property. Please
refer to the MassGIS Priority Resource Map included as Figure 3.
2.2 Surface Water and Wetlands
No surface water or wetlands are located within 500 feet of the site. The closest surface water
body to the site is Jennings Pond located approximately 570 feet southeast of the site. Reed Pond
is located approximately 1,680 feet northeast of the site and Mud Pond is located approximately
2,370 feet to the west. DEP wetlands are located to the northeast (approximately 915 feet), to the
west (approximately 1,050 feet) and to the southeast (approximately 1,115 feet).
2.3 Potable Water Supplies
The site is in an area designated as a medium yield potentially productive aquifer and is mapped
by the Town of Natick as a “groundwater recharge area” (refer to Figure 3). A Zone II area is
located approximately 525 feet north-northwest of the site. Eight municipal drinking water wells
are located within 4,921 feet of the site to the southeast and northwest, with the closest located
approximately 3,188 feet downgradient (southeast). One private well is reportedly located 885 feet
to the southwest of the site and used in a car wash operation.
2.4 Schools and Institutions
No schools or institutions were identified within 500 feet of the subject site. The closest school or
institution is the Crossroads School for Children, located approximately 0.82 miles north-northwest
of the site.
2.5 Other Potential Sensitive Receptors
Based on information from the Massachusetts GIS database, there are no known Areas of Critical
Environmental Concern or designated State, Federal, Municipal, or Private Open Space or
Recreational Facility areas within a 500 foot radius of the subject site. The MassGIS priority resource
map is included as Figure 3.

3.0 IMPLEMENTATION OF COMPREHENSIVE RESPONSE ACTIONS
Since the submission the Phase IV Status Report on April 13, 2016, Kleinfelder conducted the
following field work to implement the remedial alternative selected in the Phase IV RIP (enhanced
bioremediation using BOS 200® followed by MNA). Field work included baseline groundwater
monitoring, BOS 200® injections, and periodic post-injection groundwater monitoring.
3.1 BOS 200® Injections
From June 21 through 26, 2016, Kleinfelder personnel were onsite to oversee Geosearch
Environmental Contractors Inc. (Geosearch) and AST Environmental, Inc. (AST) conduct BOS
200® injections at 59 locations. BOS 200® consists of carbon, calcium sulfate, nitrate, phosphate,
and ammonia. The BOS 200® product traps contaminants via carbon adsorption and subsequently
facilitates biological degradation of the petroleum constituents present in the dissolved phase and
sorbed to saturated zone soils. Please refer to Figure 4 for the approximate injection locations.
AST Environmental prepared a slurry consisting of approximately 14% (by weight) BOS 200®, and
bacteria concentrate. In total, approximately 6,305 pounds of BOS 200®, 13 gallons of bacteria
concentrate, and 8,125 gallons of water were injected. The remedial additive was injected at a
depth interval of approximately 18 to 28 feet below ground surface (bgs) using a Geoprobe®. To
ensure distribution of the remedial additive at the targeted depths, the slurry was injected in two-
foot lifts of 15 to 25 pounds of BOS 200® per lift. Due to the nature of the lithology and subsurface
conditions, slight variations of injection interval and injection amount were made based on field
observations. Down-well groundwater monitoring was periodically performed on select wells
during injection activities. Refer to Table 1 for injection related monitoring data.
3.2 Groundwater Monitoring Activity
Groundwater monitoring was performed before, during, and after injections to evaluate the effects
of the remedial additives on site groundwater. Water quality parameters dissolved oxygen (DO),
oxidation reduction potential (ORP), conductivity, pH, and temperature were monitored using a
YSI 600 water quality meter. The YSI sonde was deployed approximately one foot below the water
table and allowed to stabilize for approximately 60 seconds before taking readings. Following field
water quality monitoring, a minimum of three standing well volumes of groundwater were purged
from each monitoring well. Groundwater samples were submitted for laboratory analysis of volatile
organic compounds (VOCs) via Environmental Protection Agency (EPA) 8260 methodology,
volatile petroleum hydrocarbons (VPH) via MassDEP approved methodology, sulfate via American
Society for Testing Materials (ASTM) 516-90, nitrite, and nitrate via EPA 353.2 methodology.

During BOS 200® injections, groundwater monitoring was conducted at monitoring wells A-4, OW-
3, OW-7, and OW-9R.
3.2.1 Baseline Conditions
Prior to the BOS 200® injections, on May 27, 2016, groundwater monitoring was conducted at
monitoring wells A-1, A-4, OW-3, OW-7, OW-8, OW-9R, and OW-10 to document the pre-injection
conditions at the site and establish a baseline for comparison to future data. Refer to Tables 2
and 3 for groundwater gauging and analytical results, and Table 4 for injection-related monitoring
results. The VPH distributions are displayed on Figures 5, 6, 7, and 8 respectively. Complete
laboratory reports are included as Appendix A. The following pre-injection baseline measurements
were recorded:
 DO concentrations ranged from 2.44 milligrams per liter (mg/L) at monitoring well OW-3 to
6.32 mg/L at monitoring well OW-8.
 Conductivity measurements ranged from 303 microSiemens per centimeter (μS/cm) at well
A-1 to 1,601 μS/cm at well OW-8.
 Sulfate ranged from 14.8 mg/L in well OW-8 to 55.7 mg/L at monitoring well A-4.
 Nitrogen (sum of nitrate and nitrite) ranged from 0.84 mg/L in well OW-7 to 7.4 mg/L in well
OW-8.
 Total VPH ranged from below laboratory reporting limits at monitoring wells OW-8 and OW-
10 to 15,275 µg/L at well OW-9R.
3.2.2 Post-injection Conditions
On June 25, 2016, groundwater samples were collected from downgradient monitoring wells OW-
8, OW-9R, and OW-10 and submitted to SGS for analysis of VPH. Total VPH concentrations
ranged from below laboratory detection limits in monitoring wells OW-8 and OW-10 to 21,252 µg/L
in monitoring well OW-9R.
On July 6, 2016 groundwater samples were collected from monitoring wells A-1, A-4, OW-3, and
OW-7 and submitted to SGS for analysis of VPH, VOCs, nitrate, nitrite, and sulfate. Monitoring
wells OW-5, OW-6, OW-8, OW-9R, and OW-10 were located under bituminous asphalt applied
following re-paving of Massachusetts State Route 9 and were inaccessible. Total VPH
concentrations ranged from 1,128 µg/L in monitoring well A-1 to 4,690 µg/L in monitoring well OW-
3.

On August 18, 2016 Kleinfelder supervised Geosearch access and repair groundwater monitoring
wells OW-5, OW-6, OW-8, OW-9R, and OW-10 which were paved over in June 2016. Geosearch
removed 3 inches of bituminous asphalt to access each monitoring well. The monitoring well road-
boxes were observed to be present and intact upon inspection. Geosearch replaced each
monitoring well road-box with an 8-inch traffic-rated road-box and finished each road-box
installation with hot bituminous asphalt to surrounding grade. Following monitoring well repairs,
each monitoring well was gauged for depth to water and depth to bottom using an interface probe.
Each monitoring well was re-developed using a Proactive branded Water Spout 2 Complete®
submersible pump to purge and remove ten standing well volumes.
On September 2, 2016 Kleinfelder personnel conducted post-injection groundwater monitoring and
sampling at monitoring wells A-1, A-4, OW-3, OW-8, OW-9R, and OW-10. Depth to water was
measured using an interface probe at each monitoring well. Depth to water measurements ranged
from 19.89 feet bgs (A-1) to 21.90 feet bgs (A-4). It should be noted that these were the lowest
recorded water levels in several years. Non-aqueous phase liquid (NAPL) was measured at 0.02
feet thickness in monitoring well OW-7. The presence of NAPL in well OW-7 has been previously
reported to MassDEP and is not related to a new release but rather a result of the recent drought
conditions. Groundwater was not sampled from monitoring well OW-7 during this monitoring event.
Groundwater samples were submitted to SGS for analysis of VPH, VOCs, nitrate, nitrite, and
sulfate. Total VPH concentrations ranged from below laboratory detection limits in monitoring wells
OW-8 and OW-10 to 21,369 µg/L in monitoring well OW-9R.
Please refer to Tables 4 for post-injection-related monitoring results and Table 2 for a summary of
groundwater gauging and analytical results. The distribution of VPH concentrations detected
during baseline sampling, and subsequent post-injection monitoring are displayed on Figures 5, 6,
7, and 8. Complete laboratory results are included in Appendix A. These monitoring data were
evaluated relative to the baseline monitoring data collected in May 2016 and the data collected
during the injections.
Increases in conductivity, which is an indicator of total dissolved solids, in wells A-4, OW-3, and
OW-7, increases in sulfate in wells A-4, OW-3, OW-7, and OW-10, and decreases in total VPH in
wells OW-3 and OW-7 indicate that the BOS 200® mixture was effectively delivered to the target
area.
In accordance with 310 CMR 40.1403(10), property owners have been provided the results of the
May, June, July, and September 2016 monitoring events (Appendix B).

4.0 PHASE IV COMPLETION STATEMENT
Kleinfelder, on behalf of EMES, has completed Phase IV Comprehensive Response Actions in
accordance with 310 CMR 40.0870 for the disposal site located at 99 Worcester Road in Natick,
Massachusetts. Based on the information obtained during the implementation of the
Comprehensive Remedial Action, as presented herein, the performance standards as described
in 310 CMR 40.0872 are viewed to have been met in accordance with 310 CMR 40.0879(2).
During the course of the Phase IV activities discussed herein, a total of 6,305 pounds of BOS 200®
was injected into the subsurface at 59 injection points. Field monitoring conducted during injection
activities identified variations in aquifer parameters. While additional monitoring will be necessary
to further evaluate the effects of BOS 200®, it is appears that this remedial alternative,
supplemented with monitored natural attenuation (MNA), will be an effective means of achieving a
permanent solution for this site.
Following the submittal of this Phase IV Completion Statement and ROS Opinion, ROS activities
will include periodic monitoring events as well as additional response actions deemed necessary
based on monitoring results. Additional activities may include additional BOS 200® injection
events. Subsequently, data will be evaluated to assess progress towards a condition of No
Significant Risk and a Permanent Solution.

5.0 SUBSTANTIAL HAZARD EVALUATION
To fulfill the requirements of a ROS Opinion, a SHE was performed for the disposal site associated
with RTN 3-0715. Substantial Hazard, as discussed in 310 CMR 40.0956, refers to a condition that
would pose a significant risk of harm to human health or the environment over an exposure period
from the time of notification to the present time plus five years. Under current site uses, potential
exposure to employees of the Jiffy Lube® service station, neighboring residents, utility workers,
and ecological receptors was qualitatively evaluated. The residual petroleum constituents
detected in soil and groundwater samples collected from the site are related to release(s) in the
vicinity of the gasoline UST systems on the subject property. This evaluation was performed to
assess the potential exposure pathways and hazards associated with the residual concentrations
of petroleum constituents in site soil and groundwater.
5.1 Applicability of Soil and Groundwater Standards
For the purpose of evaluating the exposure potential to soil, the MCP classifies soil in three distinct
categories: S-1, S-2, and S-3. Category S-1 soils are associated with the highest potential for
exposure while Category S-3 soils have the lowest potential for exposure. The divisions amongst
the soil categories are dependent upon the frequency and intensity of site use by both children
and adults, and the accessibility of the site soil. The table presented in 310 CMR 40.0933(9)
contains a matrix summarizing the criteria used to categorize soil.
The frequency of exposure for employees that work on-site is considered high and the intensity of
soil exposure is low because employees are present at the site on a periodic basis but are not
involved in activities that disturb the soil. Visitors and trespassers (including children) at the site
are assumed to have a low frequency and intensity of exposure. Construction or utility workers
that may be involved with redevelopment or utility repair work on the site are considered to have
a low frequency and high intensity of soil exposure because they are present on the site for a short
period of time (i.e., a time period that is typically less than 6 months) and are involved in activities
that may disturb the soil. The majority of the site is paved with asphalt, therefore Soil Category S-
3 applies to soil in the upper 15 feet of the paved areas and Soil Category S-2 applies to soil in the
upper three feet of the paved areas. Soil in the landscaped portions of the site at depths less than
three feet are classified as S-1. Should future ground-intrusive activities be conducted at this
property, the frequency of use would then be classified as low as activities of this nature are not
anticipated to be conducted on a continuous basis. In the event that future ground-intrusive
activities do take place at this property, only adults are anticipated to be present with respect to
petroleum-affected soil deemed “accessible”.

The GW-1 standards were derived to be protective of use of groundwater as drinking water. The
site is located in area designated as potentially productive medium aquifer. Therefore all site wells
are classified as GW-1. Eight municipal drinking water wells are located within 4,921 feet of the
site to the southeast and northwest. The closest municipal drinking water well is located
approximately 3,188 feet downgradient (southeast). One private well is reportedly located 885 feet
to the southwest of the site and used in a car wash operation. There are no known private drinking
water wells within 500 feet of the site.
The GW-2 standards were derived to be protective of volatile migration through the vadose zone
and indoor air vapor intrusion. Depth to groundwater is calculated to average greater than 15 feet
bgs, therefore, groundwater category GW-2 does not apply to site wells.
The Method 1 Risk Characterization GW-3 standards were derived to be protective of aquatic
organisms in surface water affected by site groundwater constituent migration. The nearest
surface water body is Jennings Pond located approximately 570 feet southeast of the site. All site
wells are classified as GW-3.
5.2 Soil Conditions
Soil analytical data for the site includes six samples collected from three soil borings by Kleinfelder
in August 2015. Soil samples were collected from soil borings SB-3, SB-1, and SB-2 located
upgradient, within, and downgradient of the historical source area respectively. Soil samples
ranged in depth from 18 to 26 feet bgs, and were analyzed for volatile petroleum hydrocarbons
(VPH) (Appendix C).
5.3 Groundwater Conditions
Groundwater samples have been collected at this site since 1989 from site-related monitoring
wells. Recent groundwater gauging and analytical data are presented in Table 2. Historical
groundwater analytical data is included as Appendix C. Groundwater samples have been
analyzed for VPH and target analytes via MassDEP-approved methodology. The delineation of
petroleum-affected groundwater has historically been defined by monitoring wells that have
exhibited low constituent concentrations and/or in which constituents were infrequently detected.
The historical limits of affected groundwater were horizontally and vertically delineated at this site
as within the area of monitoring well locations OW-11 to the north, A-1 to the east, OW-10 to the
southeast, OW-8 to the southwest, and OW-1 to the west. Groundwater monitoring data collected

from monitoring well OW-9R indicate that petroleum-affected groundwater is likely to extend under
a portion of state highway Route 9 to the south of the site.
The horizontal extent of petroleum-affected groundwater has been established by elevated
concentrations of VPH detected historically in samples collected from monitoring wells A-4, OW-
3, and OW-7. Over the recent two-year period of groundwater monitoring, petroleum constituents
including ethylbenzene, total xylenes, naphthalene, C5-C8 aliphatics, C9-C12 aliphatics, and C9-C10
aromatics have been detected above MCP Method 1 GW-1 standards in groundwater collected
from monitoring wells A-1, A-4, OW-3, OW-7, and OW-9R. The highest concentration of
constituents was detected in monitoring wells located immediately west, and south of the former
gasoline tank field.
The direction of groundwater in the overburden aquifer has been calculated to be to the south/
southwest. As shown in Table 2, groundwater analytical data collected since 1989 indicate that
overall petroleum mass and the area of affected groundwater are decreasing over time. The
historical maximum extent of affected area has been adequately delineated and, based on historical
sampling data, has not, nor is likely to, affect the above mentioned receptors.
5.4 Exposure Pathway Evaluation
5.4.1 Soil Contact
Soil analytical results following the recent August 2015 soil boring investigation indicate no
exceedances of applicable MCP Method 1 Soil Standards with the exception of naphthalene, and
C9-C10 aromatic hydrocarbons in a single location within the former gasoline tank field area. Under
current conditions, petroleum-affected soil is at a depth of approximately 18 feet bgs, under the
paved surface of the site.
Therefore, there are no current exposures to affected soil at this site for neighboring residents, site
employees, customers, future construction workers, and utility workers. Therefore, exposure to
soil via these pathways is incomplete. Based on this analysis, no substantial hazards with regard
to soil exist at the site.

5.4.2 Groundwater Ingestion
Although the site is located within a potential drinking water source area (Potentially Productive
Medium Yield Aquifer), groundwater sample analytical results appear to have defined the full
horizontal and vertical extent of dissolved-phase petroleum affect at this site. As shown in Table 2,
groundwater analytical data collected since 1989 indicate that overall petroleum mass and the area
of affected groundwater are decreasing over time. The historical maximum extent of affected area
has been adequately delineated and, based on historical sampling data, has not, nor is likely to,
affect the above mentioned receptors. On this basis, the groundwater ingestion pathway is
considered to be incomplete and as such, does not represent a substantial hazard to groundwater
off-site.
5.4.3 Volatilization
There are residential properties with basements within 300 feet of the site. The depth to groundwater
at the site is approximately 16-22 feet bgs. Groundwater averages at greater than 15 feet bgs, and
volatile constituents at concentrations greater than Method 1 GW-2 groundwater standards have not
been detected in monitoring wells within 30 feet of a building since August 2010 (OW-7 C9-C10
aromatics). Concentrations of soil vapors measured most recently in August 2015 at soil vapor point
VP-1 were below applicable threshold levels (Table 5). Therefore, volatilization of constituents into
indoor air of the on-site building is not considered a potentially complete exposure pathway.
5.4.4 Ecological Risk Evaluation
As specified in 310 CMR 40.0956(2), the focus of an Ecological Substantial Hazard Evaluation shall
be on any environmental resource areas, such as wetlands, aquatic terrestrial habitats, and fisheries
that exist at a site. There are no mapped wetlands, aquatic habitats or fisheries that exist on the
site. The closest surface water body to the site is Jennings Pond located approximately 570 feet
southeast of the site. Reed Pond is located approximately 1,680 feet northeast of the site and
Mud Pond is located approximately 2,378 feet to the west. DEP wetlands are located to the
northeast (approximately 915 feet), to the west (approximately 1,050 feet) and to the southeast
(approximately 1,115 feet).
There have been no recent concentrations of petroleum constituents detected in the most down
gradient wells above Method 1 GW-3 groundwater risk characterization standards, with the
exception of total xylene concentrations detected in monitoring well OW-9R. As shown in Table 2
and Appendix C, groundwater analytical results from monitoring wells located between monitoring
well OW-9R and the above mentioned receptors (A-1, A-7, OW-1, OW-8, OW-10 and OW-11) have

demonstrated concentrations of total xylenes and other target constituents below the applicable
Method 1 GW-3 groundwater standards. As such, it is the opinion of Kleinfelder that there is not a
complete pathway from site groundwater to surrounding surface water receptors. On this basis,
current site groundwater conditions do not pose a substantial hazard to ecological receptors.
5.4.5 Utility Workers
Under current conditions, utility workers engaged in emergency utility repair work may be exposed
to constituents of concern in soil and groundwater via dermal contact, incidental ingestion, and
inhalation of ambient air. Site soil has been demonstrated to pose no significant risk to receptors.
The concentrations of VPH in site groundwater do not meet the conditions provided by MassDEP
for when a quantitative evaluation of risk to utility workers is required. These include exposures
associated with acute, non-cancer effects, inhalation of vapors from NAPL, or potential explosive
vapors. Therefore, petroleum-affected groundwater does not pose a substantial hazard to utility
workers under current site conditions.
5.5 Findings of Substantial Hazard Evaluation
In conclusion, a qualitative evaluation of hazards posed by site soil and groundwater conditions
under currently foreseeable site uses and activities found no complete exposure pathways that
would pose a significant risk to human health or ecological receptors. Thus, in accordance with
310 CMR 40.0956, a condition of No Substantial Hazard currently exists to human health or the
environment at the site.

6.0 REMEDY OPERATION STATUS OPINION
Phase IV activities have been completed pursuant to the provisions set forth in 310 CMR 40.0800
for Comprehensive Response Actions. The continued operation, maintenance and monitoring of
the Comprehensive Remedial Action will be conducted at this site under the ROS provisions set
forth in 310 CMR 40.0890. Accordingly, the objective of this section is to demonstrate that the
criteria set forth in 310 CMR 40.0893 for ROS have been achieved at this site based on the
following criteria:
 the remedial program presented in the Phase III-IV dated October 16, 2015 has been
adequately designed in accordance with 310 CMR 40.0870 to achieve a Permanent
Solution;
 the remedial program will be operated and maintained in accordance with the
requirements of 310 CMR 40.0890;
 the source of oil and/or hazard material (OHM) associated with this site has been
eliminated and/or controlled pursuant to 310 CMR 40.1003(5);
 current site conditions do not constitute a substantial hazard at this site; and
 information and data on operation and maintenance and/or monitoring will be
documented and submitted to the MassDEP every six months in a reports as described
in 310 CMR 40.0892.
Based on the information presented, it is the opinion of Kleinfelder that the remedial program has
been conducted in accordance with the requirements of 310 CMR 40.0870, that the source of OHM
has been eliminated or controlled in accordance with 310 CMR 40.1003(5), and that substantial
hazards have been eliminated. Kleinfelder will continue to review all provided information and the
current site conditions and to re-evaluate their opinions as new information becomes available.
6.1 Future Remedial Actions
Following the submission of this ROS Opinion, groundwater monitoring activities will continue on
an approximate quarterly to semi-annually basis. Select site wells will be gauged and sampled for
laboratory analysis of VPH constituents. NAPL conditions will continue to be monitored at
monitoring well OW-7. If areas of the site do not adequately respond to the initial BOS 200®
injections and data indicate that MNA will not be suitable to achieve a condition of no significant
risk in the foreseeable future then, additional remedial injections may be conducted under ROS.

The results of these monitoring activities will be tabulated and submitted to the MassDEP twice
per year in ROS Reports. Based on an ongoing evaluation of the data collected, the scope and
frequency of monitoring may be modified at the direction of the LSP. Any such modifications will
be supported and documented in ROS reports.
6.2 Reporting
Subsequent to the submittal of this ROS Opinion, ROS Reports will be submitted, at minimum,
every six months from the submittal of this report until such time that a Permanent Solution may
be achieved through the demonstration of a condition of “no significant risk” in accordance with the
requirements of 310 CMR 40.1000. Each report will be completed in accordance with 310 CMR
40.0893.
6.3 Future Course of Action
The following is a tentative timeline for upcoming response actions:
 Groundwater Monitoring Events – December 2016 and March 2017
 ROS Report – April 2017

7.0 LIMITATIONS
Kleinfelder performed the services for this project under the Standard Procurement Agreement
with Procurement, a division of ExxonMobil Global Services Company (effective October 2011).
Kleinfelder states that the services performed 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 Exxon Mobil Global Services Company and its affiliates.

8.0 REFERENCES
The following sources have been referenced herein:
American Petroleum Institute (API), 1989: A Guide to the Assessment and Remediation of
Underground Petroleum Releases. API Publication Number 1628, Second Edition, August 1989
CDM, 2004, Revised Phase II Comprehensive Site Assessment and Phase III Remedial Action
Plan
CDM, 2004, Phase IV Remedy Implementation Plan
CDM, 2004, Phase V Final Inspection Report, Completion Statement, and Remedy Operation
Status
CDM, 2006, Class C-1 Response Action Outcome Statement
MassDEP, 2014. 310 CMR 40.0000, Massachusetts Contingency Plan, Commonwealth of
Massachusetts Department of Environmental Protection
CDM, 2008, Immediate Response Action Plan
CDM, 2008, Immediate Response Action Modification Plan
CDM, 2009, Immediate Response Action Completion
Kleinfelder, 2012, Class C-1 Response Action Outcome Retraction, Phase III Remedial Action
Plan/Phase IV Remedial Implementation Plan and Tier II Extension

SITE LOCATION MAP
FORMER MOBIL STATION #01-JE4
99 WORCESTER ROAD
NATICK, MASSACHUSETTS
1
01-JE4
MAY 2012
ANG
-----
01JE4_LOCUS
SITE LOCATION
PROJECT NO.
DRAWN:
DRAWN BY:
CHECKED BY:
FILE NAME:
PLATE
www.kleinfelder.com
The 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.
1,700 1,7000
Feet
FIGURE

[q
[q
[q
[q[q[q
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SITE LOCATION
WORCESTER STREET
BACON STREET
W
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SEAVERSTREET
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SCHOOLSTREET
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CHRYSLER ROAD
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!(9
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UV135
UV126
UV135
PRIORITY RESOURCE MAP
FORMER MOBIL STATION #01-JE4
99 WORCESTER ROAD
NATICK, MASSACHUSETTS
3
01-JE4
OCT 2016
ANG
-----
01JE4_GIS
The 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.
£
1,500 1,5000
Feet
Legend
Towns
Interstate
Coast
All Roads
Road Classification
Limited Access Highway
Multi-lane Hwy, not limited access
Other Numbered Highway
Major Road, Collector
Minor Road, Arterial
Water Supplies
TYPE
[q Groundwater
[p Surface Water
[p Emergeny Surface Water
$ Non-Transient Non-Community
$ Transient Non-Community
Shoreline
Hydrologic Connection
Mean Low Water Line
Wetland Limit
Closure Line
Marsh/Bog
Wooded marsh
Cranberry Bog
Salt Marsh
Open Water
Reservoir (with PWSID)
Tidal Flats
Beach/Dune
NHESP 2007 Priority Habitats of Rare Species
NHESP 2007 Estimated Habitats of Rare Wildlife
[´ NHESP 2008 Massachusetts Certified Vernal Pools
ACECs
Federal
DCR-State Parks & Recreation
DCRS/DFG
Department of Fish & Game
DCR-Urban Parks & Recreation
DCR-Water Supply Protection
Department of Agricultural Resources
Commonwealth of Massachusetts
County
Municipal
Public Non-Profit
Land Trust
Conservation Organization
Non-Profit
Private
Other
Unknown
Zone A
Zone B
Zone C
IWPAs
DEP Approved Zone IIs
Sole Source Aquifers
High Yield
Medium Yield
High Yield
Medium Yield
Medium Yield Aquifer
PROJECT NO.
DRAWN:
DRAWN BY:
CHECKED BY:
FILE NAME:
www.kleinfelder.com
FIGURE

Well ID Date Time
DTW
(ft)
DO
(mg/L)
ORP
(mV)
Cond
(mS/cm)
pH
Temp
(°C)
A-1 05/27/16 9:10 18.62 6.25 -92.5 303 7.40 15.91
07/06/16 8:08 19.10 2.73 -25.3 346 8.31 14.70
09/02/16 8:01 19.89 5.24 -14.7 310 9.20 18.19
A-4 05/27/16 9:15 20.32 3.57 466.0 497 7.39 14.04
06/26/16 11:06 NM 4.08 -15.5 1850 6.54 14.78
07/06/16 8:47 20.94 7.24 6.5 964 8.17 14.82
09/02/16 8:09 21.90 4.55 -32.8 490 7.70 16.73
OW-3 05/27/16 9:25 18.89 2.44 -191.0 556 7.03 15.02
06/22/16 5:06 NM 0.58 -40.1 880 6.45 12.95
06/26/16 10:51 NM 2.05 4.9 2120 6.44 14.27
07/06/16 9:28 19.77 11.92 12.9 1316 8.51 13.17
09/02/16 8:19 20.58 3.05 -61.4 1510 6.94 16.13
OW-5 05/27/16 NM DRY NM NM NM NM NM
09/02/16 NM DRY NM NM NM NM NM
OW-7 05/27/16 9:20 19.50 3.00 -179.8 420 7.16 14.81
06/22/16 5:21 NM 0.63 -28.7 1530 6.48 13.73
06/26/16 11:17 NM 1.72 39.7 1590 NM 14.03
07/06/16 10:10 20.50 0.48 63.8 1681 8.28 12.93
09/02/16 8:28 21.37
OW-8 05/27/16 NM 18.87 6.32 -44.9 1601 6.22 15.47
09/02/16 7:38 20.11 7.65 151.4 1070 6.09 14.99
OW-9R 05/27/16 11:10 18.92 2.50 -162.1 771 6.49 16.37
06/24/16 8:34 NM 1.08 -35.4 790 6.05 12.89
09/02/16 12:32 20.00 3.09 -17.3 970 6.80 14.83
OW-10 05/27/16 10:45 18.33 5.36 -116.5 910 7.09 16.28
09/02/16 12:05 20.11 4.80 94.4 550 7.23 15.87
Notes: NM - Not Measured
ft - feet
ppm - parts per million
mV - millivolts
mS/cm - milliSiemens per centimeter
°C - degrees celsius
Not Monitored Due to NAPL
May 27, 2016 through September 2, 2016
Table 1
Injection Related Groundwater Monitoring Parameters
Former Mobil Service Station No. 01-JE4
99 Worcester Road
10/5/2016
Ref.#01-JE4_Tbl_Field monitoring_GW
Kleinfelder
1 Speen Street, Suite 200, Framingham, MA

Corrected
GW
Elevation
(feet)
Well ID Date Benzene
(µg/L)
Toluene
(µg/L)
Ethyl-
benzene
(µg/L)
Total
Xylenes
(µg/L)
C5 - C8
Aliphatics
(µg/L)
CommentsDepth
to
Water
(feet)
Naph-
thalene
(µg/L)
Gauging & Groundwater Sample Analytical Results - Volatile Petroleum Hydrocarbons
99 Worcester Road
Page 1 of 8
October 31, 2011 through September 2, 2016
Depth to
Hydro-
carbon
(feet)
MTBE
(µg/L)
C9 - C10
Aromatics
(µg/L)
C9 - C12
Aliphatics
(µg/L)
Top of
Casing
Elevation
(feet)
Hydro-
carbon
Thickness
(feet)
Table 2
Gauging Data Analytical Data
(Groundwater
Category)
2007001000 1405 10000 70 300 700N/A N/A N/AN/A N/AMCP GW Standard GW-1
<2.0 <2.0 <2.0 <4.0 <3.0 <50<1.0 86.4<50100.02 17.71 82.31ND ND10/31/2011A-1
<1.0 <2.0 <2.0 <4.0 3.2 391<1.0 517227100.02 18.40 81.62ND ND5/21/2012(GW-1/GW-3)
<1.0 <2.0 <2.0 <4.0 <3.0 240<1.0 585178100.02 19.50 80.52ND ND10/5/2012
<1.0 <2.0 68.2 85.0 153 702<1.0 1950291100.02 21.16 78.86ND ND11/6/2012
1.7 <2.0 <2.0 <4.0 <3.0 290<1.0 401149100.02 19.32 80.70ND ND2/25/2013
<1.0 <2.0 <2.0 <4.0 <3.0 <50<1.0 <50<50100.02 17.70 82.32ND ND7/19/2013
<1.0 <2.0 <2.0 <4.0 <3.0 158<1.0 241<50100.02 18.78 81.24ND ND11/4/2013
<1.0 <2.0 <2.0 <4.0 <3.0 70.2<1.0 141<50100.02 17.75 82.27ND ND5/20/2014
<1.0 <2.0 <2.0 <4.0 <3.0 183<1.0 24550.7100.02 18.86 81.16ND ND8/29/2014
<1.0 <2.0 <2.0 <4.0 <3.0 <50<1.0 <50<50100.02 17.77 82.25ND ND2/17/2015
NS NS NS NS NS NSNS NSNS Gauge Only100.02 18.43 81.59ND ND8/6/2015
<0.50 <1.0 <1.0 <1.0 3.1 173<1.0 295176100.02 18.62 81.40ND ND5/27/2016
<0.50 <1.0 <1.0 <1.0 <3.0 334<1.0 539255100.02 19.10 80.92ND ND7/6/2016
1.4 <1.0 <1.0 <1.0 7.7 858<1.0 1280378100.02 19.89 80.13ND ND9/2/2016
<2.0 <2.0 <2.0 <4.0 <3.0 <50<1.0 <50<5099.76 18.13 81.63ND ND10/31/2011A-3
(GW-1/GW-3)
9/14/2016
Ref.: rpt_gaug_w_9_aqMA VPH & Gauging138301JE4
Kleinfelder
1 Speen Street Suite 200, Framingham, MA

Corrected
GW
Elevation
(feet)
(µg/L)
Toluene
(µg/L)
Ethyl-
benzene
(µg/L)
Total
Xylenes
(µg/L)
C5 - C8
Aliphatics
(µg/L)
CommentsDepth
to
Water
(feet)
Naph-
thalene
(µg/L)
99 Worcester Road
Page 2 of 8
Depth to
Hydro-
carbon
(feet)
MTBE
(µg/L)
C9 - C10
Aromatics
(µg/L)
C9 - C12
Aliphatics
(µg/L)
Top of
Casing
Elevation
(feet)
Hydro-
carbon
Thickness
(feet)
Table 2 (Continued)
(Groundwater
Category)
<2.0 2.0 24.2 35.9 41.5 153<1.0 1040317101.83 19.33 82.50ND ND10/31/2011A-4
<1.0 <2.0 88.4 152 173 702<1.0 36601090101.83 20.02 81.81ND ND5/21/2012(GW-1/GW-3)
<1.0 <2.0 69.1 101.6 174 466<1.0 2810542101.83 21.21 80.62ND ND10/5/2012
<1.0 <2.0 <2.0 <4.0 <3.0 471<1.0 890196101.83 19.42 82.41ND ND11/6/2012
<1.0 <2.0 80.3 61.5 206 1110<1.0 2040701101.83 20.87 80.96ND ND2/25/2013
<1.0 <2.0 11.6 10.7 23.9 109<1.0 440132101.83 19.40 82.43ND ND7/19/2013
<1.0 <2.0 51.7 57.5 87.1 652<1.0 3760505101.83 20.45 81.38ND ND11/4/2013
<1.0 <2.0 30.1 52.9 33.9 238<1.0 1450167101.83 18.86 82.97ND ND5/20/2014
<1.0 <2.0 30.6 50.1 49.0 598<1.0 1880165101.83 20.06 81.77ND ND8/29/2014
NS NS NS NS NS NSNS NSNS Unble to locate101.83 NM NMNM NM2/17/2015
<1.0 <2.0 <2.0 <4.0 <3.0 <50<1.0 <50<50101.83 20.08 81.75ND ND8/6/2015
<0.50 <1.0 44.6 62.3 116 439<1.0 2360709101.83 20.32 81.51ND ND5/27/2016
NS NS NS NS NS NSNS NSNS MNA Only101.83 NM NMNM NM6/26/2016
<1.0 <2.0 36.7 65.6 29.9 440<1.0 1940528101.83 20.94 80.89ND ND7/6/2016
<1.0 <2.0 56.4 93.4 200 1790<1.0 50102590101.83 21.90 79.93ND ND9/2/2016
<2.0 <2.0 <2.0 <4.0 <3.0 <50<1.0 <50<50100.43 19.23 81.20ND ND10/31/2011OW-1
<1.0 <2.0 <2.0 <4.0 <3.0 <50<1.0 <50<50100.43 20.18 80.25ND ND5/21/2012(GW-1/GW-3)
9/14/2016
Kleinfelder

Corrected
GW
Elevation
(feet)
(µg/L)
Toluene
(µg/L)
Ethyl-
benzene
(µg/L)
Total
Xylenes
(µg/L)
C5 - C8
Aliphatics
(µg/L)
CommentsDepth
to
Water
(feet)
Naph-
thalene
(µg/L)
99 Worcester Road
Page 3 of 8
Depth to
Hydro-
carbon
(feet)
MTBE
(µg/L)
C9 - C10
Aromatics
(µg/L)
C9 - C12
Aliphatics
(µg/L)
Top of
Casing
Elevation
(feet)
Hydro-
carbon
Thickness
(feet)
Table 2 (Continued)
(Groundwater
Category)
<2.0 55.9 478 1586 201 182<1.0 2580116099.57 17.57 82.00ND ND10/31/2011OW-3
<1.0 137 1080 5840 572 618<1.0 705080999.57 18.50 81.07ND ND5/21/2012(GW-1/GW-3)
<10 169 2410 10870 537 1230<10 7930243099.57 20.03 79.54ND ND10/5/2012
<10 357 1360 9440 257 554<10 426086399.57 19.86 79.71ND ND11/6/2012
<5.0 37.9 564 3990 310 596<5.0 4700172099.57 20.66 78.91ND ND2/25/2013
<1.0 15.8 97.5 255 58.1 143<1.0 105064199.57 17.70 81.87ND ND7/19/2013
<1.0 54.8 996 5070 354 519<1.0 824039599.57 19.00 80.57ND ND11/4/2013
<1.0 2.8 123 435 81.2 <50<1.0 86585.499.57 16.89 82.68ND ND5/20/2014
<1.0 7.6 157 529 120 130<1.0 121020999.57 18.51 81.06ND ND8/29/2014
<1.0 <2.0 2.8 13.9 13.3 <50<1.0 114<5099.57 17.75 81.82ND ND2/17/2015
<2.0 18.5 418 2033 227 121<2.0 381081799.57 18.66 80.91ND ND8/6/2015
<1.0 15.7 749 630 299 276<2.0 2000124099.57 18.89 80.68ND ND5/27/2016
<2.0 63.6 498 1400 132 341<2.0 164061599.57 19.77 79.80ND ND7/6/2016
<0.50 2.9 43.8 44.4 36.6 140<1.0 23780.599.57 20.58 78.99ND ND9/2/2016
NS NS NS NS NS NSNS NSNS Unable to locate100.14 NM NMNM NM10/31/2011OW-4
(GW-1/GW-3)
9/14/2016
Kleinfelder

Corrected
GW
Elevation
(feet)
(µg/L)
Toluene
(µg/L)
Ethyl-
benzene
(µg/L)
Total
Xylenes
(µg/L)
C5 - C8
Aliphatics
(µg/L)
CommentsDepth
to
Water
(feet)
Naph-
thalene
(µg/L)
99 Worcester Road
Page 4 of 8
Depth to
Hydro-
carbon
(feet)
MTBE
(µg/L)
C9 - C10
Aromatics
(µg/L)
C9 - C12
Aliphatics
(µg/L)
Top of
Casing
Elevation
(feet)
Hydro-
carbon
Thickness
(feet)
Table 2 (Continued)
(Groundwater
Category)
NS NS NS NS NS NSNS NSNS Well Dry98.84 DRY DRYDRY DRY10/5/2012OW-5
NS NS NS NS NS NSNS NSNS Well Dry98.84 DRY DRYDRY DRY11/6/2012(GW-1/GW-3)
NS NS NS NS NS NSNS NSNS Well Dry98.84 DRY DRYDRY DRY2/25/2013
NS NS NS NS NS NSNS NSNS98.84 DRY DRYDRY DRY9/2/2016
NS NS NS NS NS NSNS NSNS Gauge Only98.74 19.30 79.44ND ND11/4/2013OW-6
NS NS NS NS NS NSNS NSNS Well Dry98.74 DRY DRYDRY DRY5/27/2016(GW-1/GW-3)
NS NS NS NS NS NSNS NSNS98.74 DRY DRYDRY DRY9/2/2016
9/14/2016
Kleinfelder

Corrected
GW
Elevation
(feet)
(µg/L)
Toluene
(µg/L)
Ethyl-
benzene
(µg/L)
Total
Xylenes
(µg/L)
C5 - C8
Aliphatics
(µg/L)
CommentsDepth
to
Water
(feet)
Naph-
thalene
(µg/L)
99 Worcester Road
Page 5 of 8
Depth to
Hydro-
carbon
(feet)
MTBE
(µg/L)
C9 - C10
Aromatics
(µg/L)
C9 - C12
Aliphatics
(µg/L)
Top of
Casing
Elevation
(feet)
Hydro-
carbon
Thickness
(feet)
Table 2 (Continued)
(Groundwater
Category)
3.1 93.9 449 2020 154 3460<1.0 82403180100.38 18.16 82.22ND ND10/31/2011OW-7
<1.0 86.7 189 1497 131 1470<1.0 33301150100.38 18.95 81.43ND ND5/21/2012(GW-1/GW-3)
<1.0 1790 2760 13750 574 6040<1.0 152005910100.38 20.90 79.48ND ND10/5/2012
<10 492 364 5050 220 3930<10 87603160100.38 19.65 80.73ND ND11/6/2012
9.4 286 1110 6650 431 4590<5.0 110005650100.38 20.62 79.76ND ND2/25/2013
<10 86.2 764 2989 286 3290<10 80505310100.38 18.38 82.00ND ND7/19/2013
<5.0 62.7 478 2265 146 1180<5.0 3480263100.38 18.80 81.58ND ND11/4/2013
<1.0 41.5 736 3027 140 2180<1.0 6450571100.38 17.74 82.64ND ND5/20/2014
<5.0 34.2 301 1618 133 3540<5.0 47201130100.38 19.09 81.29ND ND8/29/2014
<2.0 14.6 374 1670 109 1050<2.0 31301770100.38 18.35 82.03ND ND2/17/2015
<1.0 27.1 651 2625 118 976<1.0 3440803100.38 19.04 81.34ND ND8/6/2015
<1.0 12.0 486 2140 170 609<2.0 17301140100.38 19.50 80.88ND ND5/27/2016
<2.0 225 472 1590 6.0 431<2.0 446369100.38 20.50 79.88ND ND7/6/2016
NS NS NS NS NS NSNS NSNS NAPL100.38 21.37 79.0321.35 0.029/2/2016
NS NS NS NS NS NSNS NSNS Well inaccessible98.74 NM NMNM NM10/31/2011OW-8
<1.0 <2.0 <2.0 <4.0 <3.0 <50<1.0 <50<5098.74 18.65 80.09ND ND5/21/2012(GW-1/GW-3)
<0.50 <1.0 <1.0 <1.0 <3.0 <50<1.0 <50<5098.74 18.87 79.87ND ND5/27/2016
<1.0 <2.0 <2.0 <4.0 <3.0 <50<1.0 <50<5098.74 19.08 79.66ND ND6/25/2016
<0.50 <1.0 <1.0 <1.0 <3.0 <50<1.0 <50<5098.74 20.11 78.63ND ND9/2/2016
9/14/2016
Kleinfelder

Corrected
GW
Elevation
(feet)
(µg/L)
Toluene
(µg/L)
Ethyl-
benzene
(µg/L)
Total
Xylenes
(µg/L)
C5 - C8
Aliphatics
(µg/L)
CommentsDepth
to
Water
(feet)
Naph-
thalene
(µg/L)
99 Worcester Road
Page 6 of 8
Depth to
Hydro-
carbon
(feet)
MTBE
(µg/L)
C9 - C10
Aromatics
(µg/L)
C9 - C12
Aliphatics
(µg/L)
Top of
Casing
Elevation
(feet)
Hydro-
carbon
Thickness
(feet)
Table 2 (Continued)
(Groundwater
Category)
NS NS NS NS NS NSNS NSNS Well inaccessible99.25 NM NMNM NM10/31/2011OW-9
<1.0 <2.0 <2.0 <4.0 <3.0 <50<1.0 <50<5099.25 17.95 81.30ND ND5/21/2012(GW-1/GW-3)
<1.0 24.6 331 606 52.8 213<1.0 50217999.25 19.72 79.53ND ND10/5/2012
<1.0 32.5 264 812 36.6 412<1.0 56210699.25 19.58 79.67ND ND11/6/2012
<1.0 93.1 1220 2072 186 1650<1.0 245087399.25 19.73 79.52ND ND2/25/2013
<1.0 <2.0 16.3 3.3 <3.0 <50<1.0 <50<5099.25 17.84 81.41ND ND7/19/2013
<1.0 <2.0 138 28.8 33.5 1371.2 182<5099.25 18.98 80.27ND ND11/4/2013
<1.0 <2.0 <2.0 <4.0 <3.0 <50<1.0 <50<5099.25 16.77 82.48ND ND5/20/2014
<1.0 <2.0 27.2 10.7 8.2 143<1.0 70.0<5099.25 18.58 80.67ND ND8/29/2014
NS NS NS NS NS NSNS NSNS Well paved over99.25 NM NMNM NM2/17/2015
NS NS NS NS NS NSNS NSNS Well Destroyed99.25 NM NMNM NM2/17/2015
<0.50 539 2040 8880 311 1530<1.0 27602080NSVD 18.92 NSVDND ND5/27/2016OW-9R
NS NS NS NS NS NSNS NSNS MNA OnlyNSVD NM NMNM NM6/24/2016(GW-1/GW-3)
<5.0 412 1810 6300 310 2350<5.0 40506020NSVD 19.11 NSVDND ND6/25/2016
<5.0 209 2340 8950 460 1840<5.0 40503520NSVD 20.00 NSVDND ND9/2/2016
<1.0 <2.0 <2.0 <4.0 <3.0 <50<1.0 <50<5099.36 19.96 79.40ND ND10/5/2012OW-10
<1.0 <2.0 <2.0 <4.0 <3.0 <50<1.0 <50<5099.36 19.57 79.79ND ND11/6/2012(GW-1/GW-3)
<1.0 <2.0 <2.0 <4.0 <3.0 <50<1.0 <50<5099.36 19.42 79.94ND ND2/25/2013
<1.0 <2.0 <2.0 <4.0 <3.0 <50<1.0 <50<5099.36 17.49 81.87ND ND7/19/2013
<1.0 <2.0 <2.0 <4.0 <3.0 <50<1.0 <50<5099.36 18.46 80.90ND ND11/4/2013
<1.0 <2.0 <2.0 <4.0 <3.0 <50<1.0 <50<5099.36 17.77 81.59ND ND5/20/2014
<1.0 <2.0 <2.0 <4.0 <3.0 <50<1.0 <50<5099.36 17.99 81.37ND ND8/29/2014
NS NS NS NS NS NSNS NSNS Well paved over99.36 NM NMNM NM2/17/2015
<0.50 <1.0 <1.0 <1.0 <3.0 <50<1.0 <50<5099.36 18.33 81.03ND ND5/27/2016
<1.0 <2.0 <2.0 <4.0 <3.0 <50<1.0 <50<5099.36 19.03 80.33ND ND6/25/2016
<0.50 <1.0 <1.0 <1.0 <3.0 <50<1.0 <50<5099.36 20.11 79.25ND ND9/2/2016
9/14/2016
Kleinfelder

Corrected
GW
Elevation
(feet)
(µg/L)
Toluene
(µg/L)
Ethyl-
benzene
(µg/L)
Total
Xylenes
(µg/L)
C5 - C8
Aliphatics
(µg/L)
CommentsDepth
to
Water
(feet)
Naph-
thalene
(µg/L)
99 Worcester Road
Page 7 of 8
Depth to
Hydro-
carbon
(feet)
MTBE
(µg/L)
C9 - C10
Aromatics
(µg/L)
C9 - C12
Aliphatics
(µg/L)
Top of
Casing
Elevation
(feet)
Hydro-
carbon
Thickness
(feet)
Table 2 (Continued)
(Groundwater
Category)
<2.0 <2.0 78.8 335 133 <50<1.0 136048798.92 17.44 81.48ND ND10/31/2011SVE-2
<1.0 <2.0 305 1629 300 57.0<1.0 440090298.92 18.05 80.87ND ND5/21/2012(GW-1/GW-3)
<2.0 <2.0 <2.0 <4.0 <3.0 <50<1.0 <50<5099.96 18.67 81.29ND ND10/31/2011SVE-3
<1.0 4.7 92.2 188 33.1 62.8<1.0 45883.299.96 18.38 81.58ND ND5/21/2012(GW-1/GW-3)
9/14/2016
Kleinfelder

Notes:
99 Worcester Road
Page 8 of 8
Table 2 (Continued)
(GW-3) - well-specific groundwater category
<1.0 - Not detected at or above the laboratory reporting limit shown
µg/L - micrograms per liter
GW - Groundwater
MTBE - methyl tertiary butyl ether
NA - Not analyzed
ND - Not detected
NM - Not Measured
NS - Not sampled
NSVD - Not surveyed to vertical datum
Shading - Reported concentration detected above the applicable standard(s) or guidance value(s)
Data for a monitoring well not displayed for a specific date indicates well was intentionally omitted from the monitoring program.
9/14/2016
Kleinfelder

1,2,4-Tri-
methyl-
benzene
1,3,5-Tri-
methyl-
benzene
Groundwater Sample Analytical Results - Volatile Organic Compounds
Well ID Date Acetone
(µg/L)
n-Butyl-
benzene
(µg/L)
sec-Butyl-
benzene
(µg/L)
Chlor-
oethane
(µg/L)
Isopropyl-
benzene
(µg/L)
(Groundwater
Category)
4-
Isopropyl-
toluene
Propyl-
benzene
(µg/L)
Chloro-
form
(µg/L)
Chloro-
methane
(µg/L)
Page 1 of 2
Comments
99 Worcester Road
Table 3
MCP GW Standard GW-1 ~~ 706300 ~ ~ ~~~ ~ ~
MCP GW Standard GW-3 ~~ 2000050000 ~ ~ ~~~ ~ ~
12.2 9.5 10.9A-1 48.5 5.7 <5.0<2.0 <5.0 6.72.9 <1.05/27/2016
<10 14.5 13.2 62.9 <5.0 <5.0<2.0 7.0 6.6<2.0 <1.0(GW-1/GW-3) 7/6/2016
10.6 21.7 21.2 179 86.5 67.5<2.0 26.0 8.7<2.0 <1.09/2/2016
15.3 17.0 12.5A-4 217 1080 2772.2 60.0 8.15.0 <1.05/27/2016
221 <50 <50 140 906 329<20 <50 <50<20 <10(GW-1/GW-3) 7/6/2016
<200 <25 <25 364 2620 730<10 96.0 <25<10 <5.09/2/2016
<20 <10 <10OW-3 93.3 1110 11.2<4.0 33.4 <10<4.0 <2.05/27/2016
345 <50 <50 80.4 600 205<20 <50 <50<20 <10(GW-1/GW-3) 7/6/2016
12.3 <5.0 <5.0 8.8 41.1 <5.0<2.0 6.4 <5.0<2.0 <1.09/2/2016
30.8 <10 <10OW-7 73.7 585 180<4.0 25.7 <10<4.0 <2.05/27/2016
191 <25 <25 <25 143 56.8<10 <25 <25<10 <5.0(GW-1/GW-3) 7/6/2016
<10 <5.0 <5.0OW-8 <5.0 <5.0 <5.0<2.0 <5.0 <5.0<2.0 5.65/27/2016
<10 <5.0 <5.0 <5.0 <5.0 <5.0<2.0 <5.0 <5.0<2.0 6.0(GW-1/GW-3) 9/2/2016
<10 6.1 8.7OW-9R 220 1060 3222.0 80.7 6.15.2 <1.05/27/2016
<200 <100 <100 153 1510 391<40 <100 <100<40 <20(GW-1/GW-3) 9/2/2016
<10 <5.0 <5.0OW-10 <5.0 <5.0 <5.0<2.0 <5.0 <5.0<2.0 <1.05/27/2016
<10 <5.0 <5.0 <5.0 <5.0 <5.0<2.0 <5.0 <5.0<2.0 <1.0(GW-1/GW-3) 9/2/2016
9/14/2016
Ref.: rpt_11_aqMA VOC_01-JE4138301JE4
Kleinfelder

Notes:
Groundwater Sample Analytical Results - Volatile Organic Compounds
Page 2 of 2
99 Worcester Road
Table 3 (Continued)
µg/L - micrograms per liter
NA - Not analyzed
NS - Not sampled
Shading - Reported concentration detected above the applicable standard(s) or guidance value(s)
9/14/2016
Ref.: rpt_11_aqMA VOC_01-JE4138301JE4
Kleinfelder

Groundwater Sample Analytical Results - Natural Attenuation Parameters
99 Worcester Road
Well ID Date pH DO
(mg/L)
Cond.
(µS/cm)
Temp.
(ºC)
Nitrite
(mg/L)
Sulfate
(mg/L)
ORP
(mV)
Nitrate
(mg/L)
Page 1 of 4
Comments
November 6, 2012 through September 2, 2016
Table 4
NA NA NA11.9811/6/2012 8.45 5.71 599 93.7A-1
NA NA NA13.152/25/2013 5.17 0.53 878 145.3
NA NA NA14.907/19/2013 6.21 4.73 377.1 129.2
NA NA NA14.1211/4/2013 6.50 5.55 513 99.7
NA NA NA13.405/20/2014 5.66 5.12 559 309.9
NA NA NA14.658/29/2014 6.36 5.40 561 86.6
2.3 <0.010 44.915.915/27/2016 7.40 6.25 303 -92.5
1.7 <0.010 52.414.707/6/2016 8.31 2.73 346 -25.3
<0.11 <0.010 21.218.199/2/2016 9.20 5.24 310 -14.7
NA NA NA12.7011/6/2012 6.83 2.67 470 11.1A-4
NA NA NA12.512/25/2013 5.80 1.70 888 217.9
NA NA NA13.207/19/2013 6.27 2.91 612.1 48.8
NA NA NA13.7211/4/2013 6.62 3.95 240 29.1
NA NA NA11.685/20/2014 6.32 4.15 728 211.1
NA NA NA13.248/29/2014 6.06 7.61 543 100.3
2.3 0.011 55.714.045/27/2016 7.39 3.57 497 466.0
NA NA NA14.786/26/2016 6.54 4.08 1850 -15.5
9.0 0.17 15914.827/6/2016 8.17 7.24 964 6.5
0.17 0.20 78.116.739/2/2016 7.70 4.55 490 -32.8
9/14/2016
Ref.: rpt_8_aqMA Natural Attenuation 06152010138301JE4
Kleinfelder

99 Worcester Road
Well ID Date pH DO
(mg/L)
Cond.
(µS/cm)
Temp.
(ºC)
Nitrite
(mg/L)
Sulfate
(mg/L)
ORP
(mV)
Nitrate
(mg/L)
Page 2 of 4
Comments
Table 4 (Continued)
NA NA NA12.3711/6/2012 5.72 3.81 2201 72.1OW-3
NA NA NA13.672/25/2013 6.56 1.75 1261 -37.0
NA NA NA14.107/19/2013 6.35 0.55 1395 9.9
NA NA NA14.8011/4/2013 817 6.45 6.50 67.5
NA NA NA12.685/20/2014 6.61 6.01 991 392.8
NA NA NA13.318/29/2014 6.22 3.14 593 -30.1
0.90 <0.010 39.015.025/27/2016 7.03 2.44 556 -191.0
NA NA NA12.956/22/2016 6.45 0.58 880 -40.1
NA NA NA14.276/26/2016 6.44 2.05 2120 4.9
7.4 0.12 47713.177/6/2016 8.51 11.92 1316 12.9
2.7 0.10 48516.139/2/2016 6.94 3.05 1510 -61.4
NA NA NA12.9611/6/2012 10.43 17.59 1381 18.3OW-7
NA NA NA13.652/25/2013 6.45 3.16 995 -84.0
NA NA NA13.007/19/2013 6.38 3.61 887 57.9
NA NA NA14.4411/4/2013 6.48 5.91 882 14.7
NA NA NA11.415/20/2014 6.47 6.73 767 216.5
NA NA NA13.428/29/2014 5.98 3.95 571 81.0
0.79 0.046 32.614.815/27/2016 7.16 3.00 420 -179.8
NA NA NA13.736/22/2016 6.48 0.63 1530 -28.7
NA NA NA14.036/26/2016 NA 1.72 1590 39.7
43.6 0.50 66012.937/6/2016 8.28 0.48 1681 63.8
NS NS NS Gauge Only - NAPLNS9/2/2016 NS NS NS NS
7.4 <0.010 14.815.475/27/2016 6.22 6.32 1601 -44.9OW-8
2.0 <0.010 17.414.999/2/2016 6.09 7.65 1070 151.4
9/14/2016
Kleinfelder

99 Worcester Road
Well ID Date pH DO
(mg/L)
Cond.
(µS/cm)
Temp.
(ºC)
Nitrite
(mg/L)
Sulfate
(mg/L)
ORP
(mV)
Nitrate
(mg/L)
Page 3 of 4
Comments
Table 4 (Continued)
NA NA NA12.3611/6/2012 6.51 5.81 893 -2.5OW-9
NA NA NA12.832/25/2013 6.13 14.91 1516 95.8
NA NA NA13.507/19/2013 6.23 6.45 3037 164.4
NA NA NA13.7011/4/2013 6.65 7.67 76.9 117.2
NA NA NA13.105/20/2014 6.48 8.65 1335 293.9
NA NA NA13.878/29/2014 6.27 4.37 862 174.7
1.3 0.021 41.516.375/27/2016 6.49 2.50 771 -162.1OW-9R
NA NA NA12.896/24/2016 6.05 1.08 790 -35.4
1.4 0.068 27.914.839/2/2016 6.80 3.09 970 -17.3
NA NA NA12.2211/6/2012 7.11 2.34 428 4.2OW-10
NA NA NA13.212/25/2013 3.81 6.87 5014 473.1
NA NA NA14.607/19/2013 6.93 7.26 330 46.5
NA NA NA14.2811/4/2013 6.44 7.44 604 78.2
NA NA NA12.735/20/2014 6.67 1.05 449 309.2
NA NA NA13.808/29/2014 6.08 4.99 822 146.6
1.5 <0.010 32.016.285/27/2016 7.09 5.36 910 -116.5
1.6 <0.010 76.015.879/2/2016 7.23 4.80 550 94.4
9/14/2016
Kleinfelder

Notes:
99 Worcester Road
Page 4 of 4
Table 4 (Continued)
µS/cm - microsiemen per centimeter
mg/L - milligram per liter
mV - millivolts
NA - Not analyzed
NS - Not sampled
ºC - degrees Celsius
pH units - pH units
9/14/2016
Kleinfelder

of 1
Hydrocarbon
Fractions
C5-C8 Aliphatics
C9-C12 Aliphatics
C9-C10 Aromatics
Soil Vapor Sample Date PID PID PID
Collection Point Response #1 Response #2 Response #3
(ppmv) (ppmv) (ppmv)
VP-1 8/6/15 ND ND ND
Notes:
ppmv - parts per million volume
ND - non-detect
PID - photoiomization detector (10.6 electron volts)
Level 1 Screening Levels utilized above are presented in Table 4-9, "Soil Gas PID/FID)
Levels for Evaluating Indoor Air Impacts", of the Implementation of MADEP VPH/EPH
Approach Final Policy (October 2002) for screening using a Photoionization detector
with a 10.6 eV - 11.4 eV lamp.
Table 5
Level 1 Soil Vapor Screening Results
99 Worcester Road
LEVEL 1 SCREENING LEVELS
August 6, 2015
Screening
Level (ppmv)
7
7
LEVEL 1 SCREENING RESULTS
29
10/12/2016
Ref. #01-JE4_Tbl_Level 1 Soil Vapor
Kleinfelder
1 Speen Street, Suite 200, Framingham, MA

APPENDIX A
Complete Laboratory Reports

06/15/16
Technical Report for
ExxonMobil
GSCMA:S/S 01-JE4, 99 Worcester Road, Natick, MA
(DIR)PO# 51351-320058
SGS Accutest Job Number: MC46120
Sampling Date: 05/27/16
Report to:
Kleinfelder
One Speen Street
Framingham, MA 01701
mhabedank@kleinfelder.com; ryarnell@kleinfelder.com
ATTN: Mark Habedank
Total number of pages in report:
Certifications: MA (M-MA136,SW846 NELAC) CT (PH-0109) NH (250210) RI (00071) ME (MA00136) FL (E87579)
NY (11791) NJ (MA926) PA (6801121) ND (R-188) CO MN (11546AA) NC (653) IL (002337) WI (399080220)
DoD ELAP (L-A-B L2235)
This report shall not be reproduced, except in its entirety, without the written approval of SGS Accutest.
Test results relate only to samples analyzed.
New England • 50 Deangelo Drive • Building 1 • Marlborough, MA 01752 • tel: 508-481-6200 • fax: 508-481-7753 • http://www.accutest.com
Test results contained within this data package meet the requirements
of the National Environmental Laboratory Accreditation Program
and/or state specific certification programs as applicable.
Client Service contact: Robert Soll 508-481-6200
H. (Brad) Madadian
Lab Director
New England 06/15/16
e-Hardcopy 2.0
Automated Report
103
SGS Accutest is the sole authority for authorizing edits or modifications to this document.
Unauthorized modification of this report is strictly prohibited.
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MC46120

Table of Contents
-1-
Sections:
Section 1: Sample Summary ................................................................................................... 3
Section 2: Case Narrative/Conformance Summary .............................................................. 4
Section 3: Summary of Hits .................................................................................................... 7
Section 4: Sample Results ........................................................................................................ 11
4.1: MC46120-1: A-1 ........................................................................................................... 12
4.2: MC46120-2: A-4 ........................................................................................................... 17
4.3: MC46120-3: OW-3 ....................................................................................................... 22
4.4: MC46120-4: OW-8 ....................................................................................................... 27
4.5: MC46120-5: OW-7 ....................................................................................................... 32
4.6: MC46120-6: OW-9R .................................................................................................... 37
4.7: MC46120-7: OW-10 ..................................................................................................... 42
Section 5: Misc. Forms ............................................................................................................ 47
5.1: Parameter Certifications (MA) ...................................................................................... 48
5.2: Chain of Custody ........................................................................................................... 49
5.3: MCP Form ..................................................................................................................... 51
5.4: VPH Form ...................................................................................................................... 52
5.5: Sample Tracking Chronicle ........................................................................................... 59
5.6: QC Evaluation: MA MCP Limits .................................................................................. 61
Section 6: GC/MS Volatiles - QC Data Summaries .............................................................. 74
6.1: Method Blank Summary ................................................................................................ 75
6.2: Blank Spike/Blank Spike Duplicate Summary .............................................................. 83
6.3: Internal Standard Area Summaries ................................................................................ 91
6.4: Surrogate Recovery Summaries ..................................................................................... 95
Section 7: GC Volatiles - QC Data Summaries ..................................................................... 96
7.1: Method Blank Summary ................................................................................................ 97
7.2: Blank Spike/Blank Spike Duplicate Summary .............................................................. 99
7.3: Surrogate Recovery Summaries ..................................................................................... 101
Section 8: General Chemistry - QC Data Summaries .......................................................... 102
8.1: Method Blank and Spike Results Summary .................................................................. 103
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MC46120

SGS Accutest
Sample Summary
ExxonMobil
Job No: MC46120
GSCMA:S/S 01-JE4, 99 Worcester Road, Natick, MA
Project No: (DIR)PO# 51351-320058
Sample Collected Matrix Client
Number Date Time By Received Code Type Sample ID
MC46120-1 05/27/16 08:10 MB 05/27/16 AQ Ground Water A-1
MC46120-2 05/27/16 08:20 MB 05/27/16 AQ Ground Water A-4
MC46120-3 05/27/16 08:40 MB 05/27/16 AQ Ground Water OW-3
MC46120-6 05/27/16 11:00 MB 05/27/16 AQ Ground Water OW-9R
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1

7 Sample(s), 0 Trip Blank(s) and 0 Field Blank(s) were collected on 05/27/2016 and were received at SGS Accutest New England
on 05/27/2016 properly preserved, at 0.8 Deg. C and intact. These Samples received a job number of MC46120. A listing of the
Laboratory Sample ID, Client Sample ID and dates of collection are presented in the Results Summary Section of this report.
Except as noted below, all method specified calibrations and quality control performance criteria were met for this job. For more
information, please refer to QC summary pages.
Client: ExxonMobil
Site: GSCMA:S/S 01-JE4, 99 Worcester Road, Natick, MA
Job No MC46120
Report Date 6/15/2016 2:37:58 PM
SAMPLE DELIVERY GROUP CASE NARRATIVE
Volatiles by GCMS By Method SW846 8260C
Matrix: AQ Batch ID: MSU1510
All samples were analyzed within the recommended method holding time.
All method blanks for this batch meet method specific criteria.
MC46120-1 through -7 for 1,4-Dioxane, Dichlorodifluoromethane, Trichlorofluoromethane: Continuing Calibration MSU1510-
CC1507 exceeds 20% Difference (biased low). Reporting Limit response verified by low-level standard.
MC46120-2, 6 for Chloromethane: Continuing Calibration MSU1510-CC1507 exceeds 20% Difference (biased low). Result
may be biased low.
MC46120-1, 3, 5, 7 for Chloromethane: Continuing Calibration MSU1510-CC1507 exceeds 20% Difference (biased
low).Reporting Limit response verified by low-level standard.
RPD(s) for MSU1510-BSD for Acetone, Chloromethane: Outside control limits. Individual spike recoveries within acceptance
limits.
The response factor (RF) for Acetone, 2-Butanone low point and average point ( 0.026, 0.033 ) and ( 0.029, 0.038 ) in the initial
calibration MSU1507-ICC1507 are less than the required RF of 0.1 as noted in Table 4 of SW846 8260C.
Continuing calibration check standard MSU1510-CC1507 for 2-hexanone exceeds 20% Difference (response biased high).
Associated samples are non-detected for this compound.
Initial calibration verification MSU1507-ICV1507 for dichlorodifluoromethane, 2-hexanone exceed 30% Difference (biased
high). Associated samples are non-detected for these compounds.
Quadratic regression is employed for initial calibration standard MSU1507-ICC1507 for Trichloroethene, 1,4-dioxane, cis-1,3-
dichloropropene, trans-1,3-dichloropropene, 1,1,2-trichloroethane, 1,3,5-trimethylbenzene, tert-butylbenzene, 1,2,4-
trimethylbenzene, sec-butylbenzene, p-isopropyltoluene.
MSU1510-BS for Acetone, 2-Hexanone, MSU1510-BSD for Chloromethane, trans-1,3-Dichloropropene, 1,4-Dioxane, 2-
Hexanone, 1,1,2,2-Tetrachloroethane and RPD for MSU1510-BSD for 1,4-Dioxane are outside MCP criteria, but within in-
house control limits.
MC46120-4 for Chloromethane, Dichlorodifluoromethane: Continuing Calibration MSU1512-CC1507 exceeds 20% Difference
(biased low). Reporting Limit response verified by low-level standard.
RPD for MSU1512-BSD for 1,1,2,2-Tetrachloroethane: Outside control limits. Individual spike recoveries within acceptance
limits.
Continuing calibration check standard MSU1512-CC1507 for acetone, 2-hexanone exceeds 20% Difference (response biased
high). Associated samples are non-detected for these compounds.
MSU1512-BS/BSD for Acetone are outside MCP criteria, but within in-house control limits.
MC46120-5, 6: Sample reanalyzed past recommended hold time.
MC46120-2, 3: Sample reanalyzed past recommended hold time.
Wednesday, June 15, 2016 Page 1 of 3
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2

Volatiles by GC By Method MADEP VPH REV 1.1
Matrix: AQ Batch ID: GBD3652
Matrix: AQ Batch ID: GBD3653
Wet Chemistry By Method ASTM516-90,02
Matrix: AQ Batch ID: GN53954
Matrix: AQ Batch ID: GN53955
Wet Chemistry By Method EPA 353.2
Matrix: AQ Batch ID: GP20488
All samples were distilled within the recommended method holding time.
Matrix: AQ Batch ID: R38480
MC46120-1 for Nitrogen, Nitrate: Calculated as: (Nitrogen, Nitrate + Nitrite) - (Nitrogen, Nitrite)
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2

Wet Chemistry By Method SM 21 4500 NO2 B
SGS Accutest may not have met all requested limits due to methodology limitations, sample matrix, dilutions, or percents solids.
SGS Accutest New England certifies that all analysis were performed within method specification. It is further recommended that
this report to be used in its entirety.The Laboratory Director for SGS Accutest New England or assignee as verified by the signature
on the cover page has authorized the release of this report(MC46120).
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2

Summary of Hits Page 1 of 4
Job Number: MC46120
Account: ExxonMobil
Project: GSCMA:S/S 01-JE4, 99 Worcester Road, Natick, MA
Collected: 05/27/16
Lab Sample ID Client Sample ID Result/
Analyte Qual RL MDL Units Method
MC46120-1 A-1
Acetone 12.2 10 ug/l SW846 8260C
n-Butylbenzene 9.5 5.0 ug/l SW846 8260C
sec-Butylbenzene 10.9 5.0 ug/l SW846 8260C
Chloroethane 2.9 2.0 ug/l SW846 8260C
p-Isopropyltoluene 6.7 5.0 ug/l SW846 8260C
n-Propylbenzene 48.5 5.0 ug/l SW846 8260C
1,2,4-Trimethylbenzene 5.7 5.0 ug/l SW846 8260C
Naphthalene 3.1 3.0 ug/l MADEP VPH REV 1.1
C5- C8 Aliphatics (Unadj.) 174 50 ug/l MADEP VPH REV 1.1
C9- C10 Aromatics (Unadj.) 295 50 ug/l MADEP VPH REV 1.1
C5- C8 Aliphatics 173 50 ug/l MADEP VPH REV 1.1
Nitrogen, Nitrate a 2.3 0.11 mg/l EPA 353.2
Nitrogen, Nitrate + Nitrite 2.3 0.10 mg/l EPA 353.2
Sulfate 44.9 10 mg/l ASTM516-90,02
MC46120-2 A-4
Chloromethane b 2.2 2.0 ug/l SW846 8260C
Ethylbenzene 44.6 1.0 ug/l SW846 8260C
Isopropylbenzene 60.0 5.0 ug/l SW846 8260C
Naphthalene 116 5.0 ug/l SW846 8260C
n-Propylbenzene 217 5.0 ug/l SW846 8260C
1,2,4-Trimethylbenzene c 1080 100 ug/l SW846 8260C
1,3,5-Trimethylbenzene 277 25 ug/l SW846 8260C
m,p-Xylene 58.9 1.0 ug/l SW846 8260C
o-Xylene 3.4 1.0 ug/l SW846 8260C
Xylene (total) 62.3 1.0 ug/l SW846 8260C
Ethylbenzene 30.7 2.0 ug/l MADEP VPH REV 1.1
Naphthalene 91.2 3.0 ug/l MADEP VPH REV 1.1
m,p-Xylene 38.7 2.0 ug/l MADEP VPH REV 1.1
o-Xylene 3.8 2.0 ug/l MADEP VPH REV 1.1
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Job Number: MC46120
Account: ExxonMobil
Collected: 05/27/16
Nitrogen, Nitrite 0.011 0.010 mg/l SM 21 4500 NO2 B
MC46120-3 OW-3
Ethylbenzene 749 2.0 ug/l SW846 8260C
Isopropylbenzene 33.4 10 ug/l SW846 8260C
Naphthalene 299 10 ug/l SW846 8260C
n-Propylbenzene 93.3 10 ug/l SW846 8260C
Toluene 15.7 2.0 ug/l SW846 8260C
1,3,5-Trimethylbenzene 11.2 10 ug/l SW846 8260C
m,p-Xylene 561 2.0 ug/l SW846 8260C
o-Xylene 69.2 2.0 ug/l SW846 8260C
Xylene (total) 630 2.0 ug/l SW846 8260C
Ethylbenzene 550 4.0 ug/l MADEP VPH REV 1.1
Naphthalene 238 6.0 ug/l MADEP VPH REV 1.1
Toluene 12.6 4.0 ug/l MADEP VPH REV 1.1
m,p-Xylene 386 4.0 ug/l MADEP VPH REV 1.1
o-Xylene 46.8 4.0 ug/l MADEP VPH REV 1.1
Sulfate 39.0 5.0 mg/l ASTM516-90,02
MC46120-4 OW-8
Chloroform 5.6 1.0 ug/l SW846 8260C
MC46120-5 OW-7
Ethylbenzene 486 2.0 ug/l SW846 8260C
Isopropylbenzene 25.7 10 ug/l SW846 8260C
Naphthalene 170 10 ug/l SW846 8260C
n-Propylbenzene 73.7 10 ug/l SW846 8260C
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Job Number: MC46120
Account: ExxonMobil
Collected: 05/27/16
Toluene 12.0 2.0 ug/l SW846 8260C
m,p-Xylene 1790 5.0 ug/l SW846 8260C
o-Xylene 345 2.0 ug/l SW846 8260C
Xylene (total) 2140 5.0 ug/l SW846 8260C
Toluene 11.6 4.0 ug/l MADEP VPH REV 1.1
m,p-Xylene 1110 4.0 ug/l MADEP VPH REV 1.1
o-Xylene 217 4.0 ug/l MADEP VPH REV 1.1
MC46120-6 OW-9R
Chloromethane b 2.0 2.0 ug/l SW846 8260C
Ethylbenzene c 2040 25 ug/l SW846 8260C
Isopropylbenzene 80.7 5.0 ug/l SW846 8260C
Naphthalene 311 5.0 ug/l SW846 8260C
n-Propylbenzene 220 5.0 ug/l SW846 8260C
Toluene 539 5.0 ug/l SW846 8260C
m,p-Xylene c 6790 25 ug/l SW846 8260C
o-Xylene c 2090 25 ug/l SW846 8260C
Xylene (total) c 8880 25 ug/l SW846 8260C
Toluene 358 4.0 ug/l MADEP VPH REV 1.1
m,p-Xylene 5170 20 ug/l MADEP VPH REV 1.1
o-Xylene 1480 4.0 ug/l MADEP VPH REV 1.1
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3

Job Number: MC46120
Account: ExxonMobil
Collected: 05/27/16
MC46120-7 OW-10
(a) Calculated as: (Nitrogen, Nitrate + Nitrite) - (Nitrogen, Nitrite)
(b) Continuing Calibration outside of acceptance criteria. Result may be biased low.
(c) Sample reanalyzed past recommended hold time.
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SGS Accutest
Sample Results
Report of Analysis
New England
Section 4
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4

SGS Accutest
Report of Analysis Page 1 of 3
Client Sample ID: A-1
Lab Sample ID: MC46120-1 Date Sampled: 05/27/16
Matrix: AQ - Ground Water Date Received: 05/27/16
Method: SW846 8260C Percent Solids: n/a
File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
Run #1 U37814.D 1 06/09/16 CB n/a n/a MSU1510
Run #2
Purge Volume
Run #1 5.0 ml
Run #2
VOA MCP List
CAS No. Compound Result RL Units Q
67-64-1 Acetone 12.2 10 ug/l
71-43-2 Benzene ND 0.50 ug/l
108-86-1 Bromobenzene ND 5.0 ug/l
74-97-5 Bromochloromethane ND 5.0 ug/l
75-27-4 Bromodichloromethane ND 1.0 ug/l
75-25-2 Bromoform ND 1.0 ug/l
74-83-9 Bromomethane ND 2.0 ug/l
78-93-3 2-Butanone (MEK) ND 10 ug/l
104-51-8 n-Butylbenzene 9.5 5.0 ug/l
135-98-8 sec-Butylbenzene 10.9 5.0 ug/l
98-06-6 tert-Butylbenzene ND 5.0 ug/l
75-15-0 Carbon disulfide ND 5.0 ug/l
56-23-5 Carbon tetrachloride ND 1.0 ug/l
108-90-7 Chlorobenzene ND 1.0 ug/l
75-00-3 Chloroethane 2.9 2.0 ug/l
67-66-3 Chloroform ND 1.0 ug/l
74-87-3 Chloromethane a ND 2.0 ug/l
95-49-8 o-Chlorotoluene ND 5.0 ug/l
106-43-4 p-Chlorotoluene ND 5.0 ug/l
108-20-3 Di-Isopropyl ether ND 2.0 ug/l
96-12-8 1,2-Dibromo-3-chloropropane ND 5.0 ug/l
124-48-1 Dibromochloromethane ND 1.0 ug/l
106-93-4 1,2-Dibromoethane ND 1.0 ug/l
95-50-1 1,2-Dichlorobenzene ND 1.0 ug/l
75-71-8 Dichlorodifluoromethane a ND 2.0 ug/l
75-34-3 1,1-Dichloroethane ND 1.0 ug/l
107-06-2 1,2-Dichloroethane ND 1.0 ug/l
75-35-4 1,1-Dichloroethene ND 1.0 ug/l
156-59-2 cis-1,2-Dichloroethene ND 1.0 ug/l
156-60-5 trans-1,2-Dichloroethene ND 1.0 ug/l
ND = Not detected J = Indicates an estimated value
RL = Reporting Limit B = Indicates analyte found in associated method blank
E = Indicates value exceeds calibration range N = Indicates presumptive evidence of a compound
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