Former Gas Station, 99 Friend Street, Amesbury, MA 01913, MAG910580

May 30, 2013 Ref.# 121003

U.S. Environmental Protection Agency 5 Post Office Square, Suite 100 Mail Code OEP06-4 Boston, MA 02109-3912 ATTN: Remediation General Permit NOI Processing

Re: Remediation General Permit – Notice of Intent Excavation Dewatering 99-101 Friend Street, Amesbury, MA 01913 MassDEP RTN 3-31433

Dear EPA:

On behalf of the M.W. Development, LLC, Simmons Environmental Services, Inc. (SIMMONS) has prepared the following Notice of Intent of a Remediation General Permit (RGP) to begin operation of a dewatering system during excavation and offsite recycling of gasoline contaminated soil at 99-101 Friend Street in Amesbury, MA. Based upon the need for dewatering of this area, the subject discharge for this RGP should be classified as Category I (Petroleum Related Site Remediation), Subcategory A (Gasoline Only Sites). This RGP is being requested to allow for the dewatering to discharge to the adjacent storm drain system that drains into the Powwow River.

Background The property is owned by M.W. Development, LLC. The property was previously operated as a gasoline service station and auto repair between the 1940’s and 1980’s. Contaminants detected at the property that exceeded MassDEP standards consisted of gasoline based TPHs and/or xylenes in soil and groundwater that were released from the former gasoline and dispensing pumps. MassDEP was notified of the release under Release Tracking Number (RTN) 3-31433. The property layout is shown in the enclosed Dewatering Site Plan (Figure 2).

The Town of Amesbury will be contacted to determine if this dewatering activity and discharge to the storm drain system requires a separate application submittal for a Notice of Intent or Negative Determination of Applicability.

Treatment System As shown in the Dewatering Site Plan (Figure 2) and Process Flow Diagram (Figure 3), groundwater will be pumped from the contaminated soil excavation area into a fractionization tank, then through a bag filter and liquid phase carbon treatment unit, and then pumped out to the storm drain system that leads to the Powwow River. There is no available flow data, i.e. 7Q10, for the Powwow River that discharges into the Merrimack River. The closest comparable flow data is the Spicket River that is larger in size than the Powwow River and also discharges into the Merrimack River. The 7Q10 value (Qs) for the Spicket River listed by the U.S.G.S. National

Water Information System is 14 cubic feet per second (cfs). The maximum flow value (Qd) of discharge is 40 gpm or 0.0892 cfs. Consequently the dilution factor (DF=[(Qd+Qs)/Qd] x 0.9) is 142.1. Therefore, any exceedance of any EPA water samples limits is not expected. The maximum and average daily values for the contaminants detected were based upon 40 and 20 gallons per minute (gpm) respectively over a maximum 8 hour work day. The discharge period is not expected to be more than 8 hours per day for a maximum of 10 days that it is anticipated to take to complete the project. However, groundwater discharged from the fractionation tank to the storm drain system after treatment will be monitored and sampled to confirm that there are no exceedances of the Appendix III limits.

ACEC and NHESP Habitats According to review of the Massachusetts Geographic Information System (GIS) Site Scoring Map, the Powwow River is not part of the National Heritage Endangered Species Program (NHESP) habitat or Area of Critical Environmental Concern (ACEC).

Because the area of dewatering is related to MassDEP disposal site Release Tracking Number (RTN) 3-31433 and covered under the Massachusetts Contingency Plan (MCP) codified as 310 CMR 40.0000, then there is no need to apply to the state for coverage under BRP WM 12 (Remediation & Miscellaneous Contaminated Sites General Permit) and no fee to the MassDEP Division of Watershed Management is required.

If you have any questions concerning the above-mentioned information, please do not hesitate to call.

Stephan H. Landry Hydrogeologist

William A. Simmons, LSP, J.D. cc: M.W. Development, LLC. MassDEP, Division of Watershed Mgmt.

Attachments: Form for Notice of Intent for General Remediation Permit Figure 1 – Site Locus Map (USGS Quadrangle) Figure 2 – Dewatering Site Plan Figure 3 – Process Flow Diagram Figure 4 – MassDEP Resource Area Map Laboratory Analyses Report

213 Elm Street Salisbury, MA 01952 Tel: 978-463-6669

FIGURE 1 SITE LOCUS MAP

99-101-103 FRIEND STREET AMESBURY, MA

QUADRANGLE: NEWBURYPORT, MA o LATITUDE: 42 51’ 31” UTM: 4 746 752N O LONGITUDE: 70 56’ 39” 341 153E MAP SCALE: 1:25 000 PROJECT #121003

Powwow Villa Housing

Former Garage

101 99 Friend Friend Street Street

B3(0.1)

Former Gasoline Former USTs B11 Two Gas Station Family Building Residence B8

B9 Fractionazation Sump Tank B1/ Pump MW1 B6 ELLIS COURT - Right-Of-Way to “Powwow Villa“ B10 Bag Filter & Carbon Treatment

Estimated Storm Drain to Extent of Powwow River Gasoline Contamination FRIEND STREET and Dewatering Area

FIGURE 2 - DEWATERING SITE PLAN For Properties At: LEGEND 99 and 101 Boring Only FRIEND STREET

AMESBURY, MA Date: May 2013 Boring / Well Prepared By: Scale: 1” = 40’ SIMMONS ENVIRONMENTAL SERVICES, INC. Project #: 121003 213 Elm Street, Salisbury, MA 01952 Drafted: SHL (978) 463-6669 FIGURE 3 PROCESS FLOW DIAGRAM EXCAVATION DEWATERING SYSTEM

Fractionazation Liquid Phase Storm Influent from Tank Particulate Granular Activated Powwow Excavation Drain (10,000 to Bags Carbon Filtration System River Dewatering 20,000 gallon) Treatment Units

99-101 FRIEND STREET, AMESBURY, MA Prepared By: SIMMONS ENVIRONMENTAL SERVICES, INC. 213 Elm Street, Salisbury, MA 01952 (978) 463-6669

Date: May-August 2013 Project #: 121003 Drafted: SHL MassDEP MCP Numeric Ranking System Map Page 1 of 1

MassDEP - Bureau of Waste Site Cleanup Site Information: MCP Numerical Ranking System Map: 500 feet & 0.5 Mile Radii 99-101 FRIEND STREET The information shown is the best available at the 99-101 FRIEND STREET AMESBURY, MA date of printing. However, it may be incomplete. The 3-000031433 responsible party and LSP are ultimately NAD83 UTM Meters: repsponsible for ascertaining the true conditions 5290032mN , -7896658mE (Zone: 18) May 24, 2013 surrounding the site. Metadata for data layers shown on this map can be found at: http://www.mass.gov/mgis/.

500 m 1000 ft

http://maps.massgis.state.ma.us/images/dep/mcp/mcp.htm 5/24/2013

REPORT OF ANALYTICAL RESULTS

NETLAB Case Number Z0524-27

Prepared for:

Attn: William Simmons Simmons Environmental 213 Elm Street Salisbury, MA 01952

Report Date: May 28, 2013

Lab # RI010

NEW ENGLAND TESTING LABORATORY, INC. 1254 Douglas Avenue, North Providence, RI 02904 (401) 353-3420

Total # of Pages: 15

MassDEP Analytical Protocol Certification Form

Laboratory Name: New England Testing Laboratory, Inc. Project #: 121003

Project Location: 99-101 Friend Street RTN:

This Form provides certifications for the following data set: list Laboratory Sample ID Number(s): Z0524-27

Matrices: x Groundwater/Surface Water Soil/Sediment Drinking Water Air Other: CAM Protocol (check all that apply below):

8260 VOC 7470/7471 Hg MassDEP VPH 8081 Pesticides 7196 Hex Cr MassDEP APH CAM II A x CAM III B CAM IV A CAM V B CAM VI B CAM IX A

8270 SVOC 7010 Metals MassDEP EPH 8151 Herbicides 8330 Explosives TO-15 VOC CAM II B CAM III C CAM IV B CAM V C CAM VIII A CAM IX B 9014 Total 6010 Metals 6020 Metals 8082 PCB 6860 Perchlorate Cyanide/PAC Other x CAM III A x CAM III D CAM V A CAM VI A CAM VIII B Affirmative Responses to Questions A through F are required for “Presumptive Certainty” status Were all samples received in a condition consistent with those described on the Chain-of- A Custody, properly preserved (including temperature) in the field or laboratory, and x Yes No prepared/analyzed within method holding times? Were the analytical method(s) and all associated QC requirements specified in the selected B x Yes No CAM protocol(s) followed? Were all required corrective actions and analytical response actions specified in the selected C x Yes No CAM protocol(s) implemented for all identified performance standard non-conformances?

Does the laboratory report comply with all the reporting requirements specified in CAM VII A, D “Quality Assurance and Quality Control Guidelines for the Acquisition and Reporting of x Yes No Analytical Data”? VPH, EPH, APH, and TO-15 only: a. VPH, EPH, and APH Methods only: Was each method conducted without significant Yes No E modification(s)? (Refer to the individual method(s) for a list of significant modifications). b. APH and TO-15 Methods only: Was the complete analyte list reported for each method? Yes No Were all applicable CAM protocol QC and performance standard non-conformances identified F x Yes No and evaluated in a laboratory narrative (including all “No” responses to Questions A through E)? Responses to Questions G, H and I below are required for “Presumptive Certainty” status Were the reporting limits at or below all CAM reporting limits specified in the selected CAM x Yes No1 G protocol(s)? Data User Note: Data that achieve “Presumptive Certainty” status may not necessarily meet the data usability and representativeness requirements described in 310 CMR 40. 1056 (2)(k) and WSC-07-350. H Were all QC performance standards specified in the CAM protocol(s) achieved? x Yes No1 I Were results reported for the complete analyte list specified in the selected CAM protocol(s)? x Yes No1

1All negative responses must be addressed in an attached laboratory narrative. I, the undersigned, attest under the pains and penalties of perjury that, based upon my personal inquiry of those responsible for obtaining the information, the material contained in this analytical report is, to the best of my knowledge and belief, accurate and complete.

Signature:______Position:______Laboratory Director

Richard Warila Printed Name:______Date:______5/28/2013 Page 2 of 15 SAMPLES SUBMITTED and REQUEST FOR ANALYSIS:

The samples listed in Table I were submitted to New England Testing Laboratory on May 24, 2013. The group of samples appearing in this report was assigned an internal identification number (case number) for laboratory information management purposes. The client’s designations for the individual samples, along with our case numbers, are used to identify the samples in this report. This report of analytical results pertains only to the sample(s) provided to us by the client which are indicated on the custody record. The case number for this sample submission is Z0524-27.

Custody records are included in this report.

Site: 99-101 Friend Street

TABLE I, Samples Submitted

Sample ID Date Sampled Matrix Analysis Requested

MW1 5/22/13 Water Table II

TABLE II, Analysis and Methods

ANALYSIS DETERMINATIVE METHOD Oil & Grease SGT 1664A Total Suspended Solids 2540D Volatile Organic Compounds 8260B Total Metals Iron 6010C

Lead 6010C

Dissolved Metals Iron 6010C Lead 6010C

These methods are documented in:

Test Methods for Evaluating Solid Waste, Physical/Chemical Methods, SW-846, USEPA/OSW.

New England Testing Laboratory, Inc.

Page 3 of 15

CASE NARRATIVE:

Sample Receipt

All samples were found to be properly preserved/cooled upon receipt. All analyses were performed within EPA designated holding-times. Procedure/calibration checks required by the designated protocols were within control limits.

Metals

All analyses were performed according to NETLAB’s documented Standard Operating Procedures, within all required holding times, and with appropriate quality control measures. All QC was within laboratory established acceptance criteria. The samples were received, processed, and reported with no anomalies.

The sample for dissolved metals were filtered upon receipt to the laboratory.

Volatile Organic Compounds

All samples were analyzed within method specified holding times and according to NETLAB’s documented standard operating procedures. The results for the associated calibration, method blank and laboratory control sample (LCS) were within method specified quality control criteria.

Wet Chemistry

All samples were analyzed within method specified holding times and according to NETLAB’s documented standard operating procedures.

Page 4 of 15 Case No. Z0524-27

MW1

Reporting Date Parameter Result, mg/l Limit Analyzed

Oil & Grease SGT 6 2 5/28/13 Total Suspended Solids 689 5 5/28/13 Total Metals Iron 81.9 0.25 5/28/13 Lead 0.012 0.005 5/28/13 Dissolved Metals Iron 71.6 0.05 5/28/13 Lead 0.011 0.005 5/28/13

ND = Not Detected

New England Testing Laboratory, Inc.

Page 5 of 15 blank

RESULTS: VOLATILE ORGANIC COMPOUNDS

The presence of the NETLAB LOGO in the top right corner of each page in this section indicates:

The Technical Manager of the Organics Analysis Department certifies that the samples included in this section have been prepared and analyzed using the procedures cited and that the results have been reviewed and approved. Any exceptions or qualifications of substance have been reported in the case narrative.

Page 6 of 15 VOLATILE ORGANICS ANALYSIS DATA SHEET

Case No.: Z0524-27 Client Name: Simmons Environmental Method: 8260 Lab Sample ID: MW1

Matrix: (soil/water) WATER Lab File ID: C052809.D Sample wt/vol: 1.0 (g/ml) ML Date Sampled: 5/22/2013 % Moisture Date Analyzed: 5/28/2013 Soil Extract Volume: (uL) Dilution Factor: 1,100 Analyst's Initials: JD Soil Aliquot Volume: (uL)

CAS NO. COMPOUND UNITS: ug/L Q

75-01-4 Vinyl Chloride 1.0 U 74-83-9 Bromomethane 1.0 U 75-00-3 Chloroethane 1.0 U 67-64-1 Acetone 5.0 U 75-35-4 1,1-Dichloroethene 1.0 U 75-15-0 Carbon Disulfide 1.0 U 75-09-2 Methylene Chloride 1.0 U 1634-04-4 tert-Butyl methyl ether 1.0 U 156-60-5 trans-1,2 Dichloroethene 1.0 U 75-34-3 1,1-Dichloroethane 1.0 U 78-93-3 2-Butanone 5.0 U 594-20-7 2,2-Dichloropropane 1.0 U 156-59-2 cis-1,2-Dichloroethene 1.0 U 67-66-3 Chloroform 1.0 U 74-97-5 Bromochloromethane 1.0 U 71-55-6 1,1,1-Trichloroethane 1.0 U 563-58-6 1,1-Dichloropropene 1.0 U 56-23-5 Carbon Tetrachloride 1.0 U 71-43-2 Benzene 150 107-06-2 1,2-Dichloroethane 1.0 U 79-01-6 Trichloroethene 1.0 U 78-87-5 1,2-Dichloropropane 1.0 U 75-27-4 Bromodichloromethane 1.0 U 74-95-3 Dibromomethane 1.0 U 108-10-1 4-Methyl-2-pentanone 5.0 U 106-93-4 Ethylene Dibromide 1.0 U 10061-01-5 cis-1,3-Dichloropropene 1.0 U 108-88-3 Toluene 2000 10061-02-6 Trans-1,3-Dichloropropene 1.0 U 79-00-5 1,1,2-Trichloroethane 1.0 U 591-78-6 2-Hexanone 5.0 U 127-18-4 Tetrachloroethene 1.0 U 124-48-1 Chlorodibromomethane 1.0 U 108-90-7 Chlorobenzene 1.0 U 630-20-6 1,1,1,2-Tetrachloroethane 1.0 U

U=not detected, D=diluted, E=over range (another data sheet is included), J=below limit, B=found in blank

New England Testing Laboratory, Inc.

Page 7 of 15 VOLATILE ORGANICS ANALYSIS DATA SHEET

Case No.: Z0524-27 Client Name: Simmons Environmental Method: 8260 Lab Sample ID: MW1

CAS NO. COMPOUND UNITS: ug/L Q

100-41-4 Ethylbenzene 3400 1330-20-7 m & p-Xylene 14000 95-47-6 o-Xylene 6200 100-42-5 Styrene 1.0 U 75-25-2 Bromoform 1.0 U 98-82-8 Isopropylbenzene 120 79-34-5 1,1,2,2-Tetrachloroethane 1.0 U 108-86-1 Bromobenzene 1.0 U 96-18-4 1,2,3-Trichloropropane 1.0 U 95-49-8 2-Chlorotoluene 1.0 U 103-65-1 n-Propylbenzene 310 108-67-8 1,3,5-Trimethylbenzene 750 106-43-4 4-Chlorotoluene 1.0 U 98-06-6 tert-Butylbenzene 1.0 U 95-63-6 1,2,4-Trimethylbenzene 2900 135-98-8 sec-Butylbenzene 15 99-87-6 p-Isopropyltoluene 40 74-87-3 Chloromethane 1.0 U 75-65-0 tert butyl alcohol 1.0 U 541-73-1 1,3-Dichlorobenzene 1.0 U 109-99-9 Tetrahydrofuran 1.0 U 106-46-7 1,4-Dichlorobenzene 1.0 U 60-29-7 Diethyl Ether 1.0 U 104-51-8 n-Butylbenzene 33 95-50-1 1,2-Dichlorobenzene 1.0 U 96-12-8 1,2-Dibromo-3-chloropropane 1.0 U 120-82-1 1,2,4-Trichlorobenzene 1.0 U 87-68-3 Hexachlorobutadiene 1.0 U 91-20-3 Naphthalene 580 87-61-6 1,2,3-Trichlorobenzene 1.0 U 994-05-8 Tert-amyl Methyl Ether 1.0 U 75-71-8 Dichlorodifluoromethane 1.0 U 142-28-9 1,3-Dichloropropane 1.0 U 75-69-4 Trichlorofluoromethane 1.0 U 637-92-3 Ethyl Tert-butyl ether 1.0 U

U=not detected, D=diluted, E=over range (another data sheet is included), J=below limit, B=found in blank

New England Testing Laboratory, Inc.

Page 8 of 15 VOLATILE ORGANICS ANALYSIS DATA SHEET

Case No.: Z0524-27 Client Name: Simmons Environmental Method: 8260 Lab Sample ID: MW1

CAS NO. COMPOUND UNITS: ug/L Q

108-20-3 Diisopropyl Ether 1.0 U 123-91-1 1,4-Dioxane 250 U

U=not detected, D=diluted, E=over range (another data sheet is included), J=below limit, B=found in blank

New England Testing Laboratory, Inc.

Page 9 of 15 VOLATILE ORGANICS ANALYSIS DATA SHEET

Case No.: Z0524-27 Client Name: Simmons Environmental Method: 8260 Lab Sample ID: VBLK052813

Matrix: (soil/water) WATER Lab File ID: C052806.D Sample wt/vol: 1.0 (g/ml) ML Date Sampled: 5/22/2013 % Moisture Date Analyzed: 5/28/2013 Soil Extract Volume: (uL) Dilution Factor: 1.0 Analyst's Initials: JD Soil Aliquot Volume: (uL)

CAS NO. COMPOUNDUNITS: ug/L Q

75-01-4 Vinyl Chloride 1.0 U 74-83-9 Bromomethane 1.0 U 75-00-3 Chloroethane 1.0 U 67-64-1 Acetone 5.0 U 75-35-4 1,1-Dichloroethene 1.0 U 75-15-0 Carbon Disulfide 1.0 U 75-09-2 Methylene Chloride 1.0 U 1634-04-4 tert-Butyl methyl ether 1.0 U 156-60-5 trans-1,2 Dichloroethene 1.0 U 75-34-3 1,1-Dichloroethane 1.0 U 78-93-3 2-Butanone 5.0 U 594-20-7 2,2-Dichloropropane 1.0 U 156-59-2 cis-1,2-Dichloroethene 1.0 U 67-66-3 Chloroform 1.0 U 74-97-5 Bromochloromethane 1.0 U 71-55-6 1,1,1-Trichloroethane 1.0 U 563-58-6 1,1-Dichloropropene 1.0 U 56-23-5 Carbon Tetrachloride 1.0 U 71-43-2 Benzene 1.0 U 107-06-2 1,2-Dichloroethane 1.0 U 79-01-6 Trichloroethene 1.0 U 78-87-5 1,2-Dichloropropane 1.0 U 75-27-4 Bromodichloromethane 1.0 U 74-95-3 Dibromomethane 1.0 U 108-10-1 4-Methyl-2-pentanone 5.0 U 106-93-4 Ethylene Dibromide 1.0 U 10061-01-5 cis-1,3-Dichloropropene 1.0 U 108-88-3 Toluene 1.0 U 10061-02-6 Trans-1,3-Dichloropropene 1.0 U 79-00-5 1,1,2-Trichloroethane 1.0 U 591-78-6 2-Hexanone 5.0 U 127-18-4 Tetrachloroethene 1.0 U 124-48-1 Chlorodibromomethane 1.0 U 108-90-7 Chlorobenzene 1.0 U 630-20-6 1,1,1,2-Tetrachloroethane 1.0 U

U=not detected, D=diluted, E=over range (another data sheet is included), J=below limit, B=found in blank

New England Testing Laboratory, Inc.

Page 10 of 15 VOLATILE ORGANICS ANALYSIS DATA SHEET

Case No.: Z0524-27 Client Name: Simmons Environmental Method: 8260 Lab Sample ID: VBLK052813

CAS NO. COMPOUNDUNITS: ug/L Q

100-41-4 Ethylbenzene 1.0 U 1330-20-7 m & p-Xylene 2.0 U 95-47-6 o-Xylene 1.0 U 100-42-5 Styrene 1.0 U 75-25-2 Bromoform 1.0 U 98-82-8 Isopropylbenzene 1.0 U 79-34-5 1,1,2,2-Tetrachloroethane 1.0 U 108-86-1 Bromobenzene 1.0 U 96-18-4 1,2,3-Trichloropropane 1.0 U 95-49-8 2-Chlorotoluene 1.0 U 103-65-1 n-Propylbenzene 1.0 U 108-67-8 1,3,5-Trimethylbenzene 1.0 U 106-43-4 4-Chlorotoluene 1.0 U 98-06-6 tert-Butylbenzene 1.0 U 95-63-6 1,2,4-Trimethylbenzene 1.0 U 135-98-8 sec-Butylbenzene 1.0 U 99-87-6 p-Isopropyltoluene 1.0 U 74-87-3 Chloromethane 1.0 U 75-65-0 tert butyl alcohol 1.0 U 541-73-1 1,3-Dichlorobenzene 1.0 U 109-99-9 Tetrahydrofuran 1.0 U 106-46-7 1,4-Dichlorobenzene 1.0 U 60-29-7 Diethyl Ether 1.0 U 104-51-8 n-Butylbenzene 1.0 U 95-50-1 1,2-Dichlorobenzene 1.0 U 96-12-8 1,2-Dibromo-3-chloropropane 1.0 U 120-82-1 1,2,4-Trichlorobenzene 1.0 U 87-68-3 Hexachlorobutadiene 1.0 U 91-20-3 Naphthalene 1.0 U 87-61-6 1,2,3-Trichlorobenzene 1.0 U 994-05-8 Tert-amyl Methyl Ether 1.0 U 75-71-8 Dichlorodifluoromethane 1.0 U 142-28-9 1,3-Dichloropropane 1.0 U 75-69-4 Trichlorofluoromethane 1.0 U 637-92-3 Ethyl Tert-butyl ether 1.0 U

U=not detected, D=diluted, E=over range (another data sheet is included), J=below limit, B=found in blank

New England Testing Laboratory, Inc.

Page 11 of 15 VOLATILE ORGANICS ANALYSIS DATA SHEET

Case No.: Z0524-27 Client Name: Simmons Environmental Method: 8260 Lab Sample ID: VBLK052813

CAS NO. COMPOUNDUNITS: ug/L Q

108-20-3 Diisopropyl Ether 1.0 U 123-91-1 1,4-Dioxane 250 U

U=not detected, D=diluted, E=over range (another data sheet is included), J=below limit, B=found in blank

New England Testing Laboratory, Inc.

Page 12 of 15 2A WATER VOLATILE SYSTEM MONITORING COMPOUND RECOVERY

Lab Name: New England Testing Lab Contract: 99-101 Friend Str Lab Code: RI010 Case No.: Z0524-27 SAS No.: SDG No.: Simmons

EPA SMC1 SMC2 SMC3 TOT SAMPLE NO. # # # OUT 01 VLCS052813 108 105 94 0 02 VBLK052813 107 110 100 0 03 MW1 103 91 79 0

QC LIMITS SMC1 = 4-Bromofluorobenzene (70-130) SMC2 =Toluene-D8 (70-130) SMC3 =1,2-Dichloroethane-D4 (70-130)

# Column to be used to flag recovery values * Values outside of contract required QC limits D System Monitoring Compound diluted out

New England Testing Laboratory, Inc.

page 1 of 1 FORM II VOA-1

Page 13 of 15 Volatile Organics Laboratory Control Spike

Date Analyzed: 05/28/2013 Sample ID: VLCS052813

Spike Spike Recovery, Lower Control Upper Control Compound Added Result % Limit, % Limit, % 1,1-Dichloroethene 50.0 54.4 109 70 129 Benzene 50.0 56.9 114 73 129 Trichloroethene 50.0 56.1 112 77 122 Toluene 50.0 56.5 113 75 123 Chlorobenzene 50.0 46.1 92 73 125

Page 14 of 15 Page 15 of 15