October 17, Mr. William Brochu Sunoco, Inc. (R&M) PO Box 4209 Concord, NH 03302

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1 October 7, 20 Mr. William Brochu Sunoco, Inc. (R&M) PO Box 4209 Concord, NH RE: 3 rd Quarter 20 Report Water Supply Treatment System Operation & Maintenance Meadows Condominium Complex Route 35/Old Post Road, Cross River, NY Matrix Environmental Project #ALB9706 DUNS # NYSDEC Spill # & # Dear Mr. Brochu: The following report summarizes the history and the operation of the water supply wells (WS) at the Meadows Condominium Complex. It also summarizes the water treatment system operation and maintenance activities performed at that facility during July, August, and September 20. Historical and Current Use of Water Supply Wells There are a total of six water supply wells associated with the Meadows water supply system. The original three wells (WS, WS2, and WS3) were unable to meet the water supply volume requirements for the Meadows Condominium Complex due to well production issues. Consequently, WS4, WS5, and WS6 were installed to provide additional water to the complex. Due to age and lack of production, WS and WS3 were taken offline. Currently, water for the complex is being provided by WS2, WS4, and WS5. Use of WS6 is awaiting permit approval. To mitigate low MTBE impacts observed in WS2, the water pumped from that well is treated with a packed tower air stripper and two 000-pound carbon filters set in series. This treated water, along with water pumped from WS4 and WS5, is further treated with UV and chlorination for potable use by the Meadows Complex. Operations and Maintenance Activities Matrix personnel mobilized to the site on July 26, August 7, and September to perform routine system maintenance. System measurements were collected, the flow meter sensor was cleaned, the generator was tested, and the system components were inspected for wear. 3 rd Quarter 20 Water Treatment Approximately 388,000, 386,000 and 326,000 gallons of water were produced by WS2 and treated by the system during the months of July, August, and September, respectively. Water samples were collected from the air stripper influent, the air stripper effluent, the primary carbon vessel effluent, the secondary carbon vessel effluent, and the holding tank on September, 20. All samples were submitted to Lancaster Laboratories in Lancaster, Pennsylvania (NYSDOH

2 Meadows Condominium Complex 3 rd Quarter 20 Report Page 2 ELAP# 0670) for analysis using EPA Method Refer to the attached analytical reports for further details. The benzene, toluene, ethylbenzene, and total xylenes (BTEX) concentrations in all of the samples were below detectable limits (BDL). The MTBE concentrations in all of the samples were also BDL, except for those collected at the influent and at the air stripper effluent in June. Refer to the attached Tables for a summary of analytical data since Historical analytical data prior to that may be reviewed in the December 200 quarterly report. WS4 and WS5 have produced a combined 335,000, 48,000, and 278,000 gallons during July, August, and September, respectively. Water from these wells is not treated with the air stripper or carbon filters. Future Plans Once the permitting is completed for WS6, it will replace WS2 as a water supply well for the Meadows complex. When this occurs, the water supply for the Meadows will come exclusively from wells WS4, WS5, and WS6. Wells WS2 and WS3 will be redeveloped and then fitted with new pumps. Water pumped from those wells will be treated by the air stripper and carbon filters and then discharged into a storm drain. It is estimated that the permitting process will be complete mid-202. Please contact the undersigned at (58) should you have any questions regarding the information provided. Sincerely, Matrix Environmental Technologies Inc. Janet R. Tallman, P.E. Project Engineer Sean R. Carter, P.E. Principal Engineer Attachments cc: J. Muro, Allied Pollution H. McVeigh, Westchester County Department of Health N. Ward-Willis, Keane & Beane, P.C. K. DiScenza, Sovereign Consulting, Inc. ecc: P. DeCicco, NYSDEC Region 3 R. Rule, Shell Oil Products US Central File, Sunoco, Inc. (R&M)

3 Date WS2 Influent TABLE Summary of Laboratory Analytical Data from System Samples MTBE (μg/l) WS3 Influent Air Stripper Effluent o Carbon Effluent 2 o Carbon Effluent Holding Tank 3//09 43 off ND ND ND ND 6/9/ off ND ND ND ND 9/6/09 66 off ND ND ND ND 2/3/09 20 off ND ND ND ND 3/9/0 20 off ND ND ND ND 6/4/0 70 off ND ND ND ND 9/30/0 0 off ND ND ND ND 2/5/0 30 off ND ND ND ND 3/0/ ND off ND ND ND ND 3/26/ 50 off NS NS NS NS 6/3/ 40 off.3 ND ND ND 9// 20 off ND ND ND ND NS Not Sampled ND Not Detected at the reporting limit TBA was sampled prior to June All TBA results and all historical laboratory analytical data from before 2009 are summarized in the December 200 quarterly report.

4 TABLE 2 Summary of Laboratory Analytical Data from System Samples Total BTEX (μg/l) Date WS2 Influent WS3 Influent Air Stripper Effluent o Carbon Effluent 2 o Carbon Effluent Holding Tank 3//09 ND off ND ND ND ND 6/9/09 ND off ND ND ND ND 9/6/09 ND off ND ND ND ND 2/3/09 ND off ND ND ND ND 3/9/0 ND off ND ND ND ND 6/4/0 ND off ND ND ND ND 9/30/0 ND off ND ND ND ND 2/5/0 ND off ND ND ND ND 3/0/ ND off ND ND ND ND 3/26/ ND off NS NS NS NS 6/3/ ND off ND ND ND ND 9// ND off ND ND ND ND NS Not Sampled ND Not Detected at the reporting limit TBA was sampled prior to June All TBA results and all historical laboratory analytical data from before 2009 are summarized in the December 200 quarterly report.

5 Laboratory Analytical Reports

6 ANALYTICAL RESULTS Prepared by: Lancaster Laboratories 2425 New Holland Pike Lancaster, PA Prepared for: Sunoco c/o Matrix Env. Tech. PO Box 427 Orchard Park NY September 5, 20 Project: Route #35 - Cross River, NY Submittal Date: 09/08/20 Group Number: PO Number: CROSS RIVER Release Number: 75 State of Sample Origin: NY Client Sample Description Lancaster Labs (LLI) # WS2 Grab Water Pre Carbon Grab Water Mid Carbon Grab Water Post Carbon Grab Water Holding Tank Grab Water The specific methodologies used in obtaining the enclosed analytical results are indicated on the Laboratory Sample Analysis Record. ELECTRONIC COPY TO ELECTRONIC COPY TO ELECTRONIC COPY TO Sunoco c/o Matrix Env. Tech. LLI Sunoco c/o Matrix Env.Tech. Attn: Janet Tallman Attn: EDD GROUP Attn: Sean Carter

7 Questions? Contact your Client Services Representative Loran A Carter at (77) Ext. 375 Respectfully Submitted,

8 Page of Sample Description: WS2 Grab Water Route #35 - Cross River, NY DUNS# COC: WS2 Project Name: Route #35 - Cross River, NY Collected: 09/0/20 :40 by MRH Submitted: 09/08/20 09:50 Reported: 09/5/20 :43 Sunoco c/o Matrix Env. Tech. PO Box 427 Orchard Park NY LLI Sample # WW LLI Group # Account # CW2 CAS Number Result Program RL GC/MS Volatiles EPA Benzene N.D Ethylbenzene N.D Methyl Tertiary Butyl Ether Toluene N.D m+p-xylene n.a. N.D o-xylene N.D. State of New York Certification 0670 General Sample Comments All QC is compliant unless otherwise noted. Please refer to the Quality Control Summary for overall QC performance data and associated samples. Laboratory Sample Analysis Record VOCs BTEX/MTBE VOCs BTEX/MTBE Method EPA EPA Trial# Batch# S255AA S255AA Analysis Date and Time 09/2/20 6:40 09/2/20 7:06 Analyst Lauren C Temple Lauren C Temple 0 #=Laboratory MethodDetection Limit exceeded target detection limit N.D.=Not detected at or above the Reporting Limit

9 Page of Sample Description: Pre Carbon Grab Water Route #35 - Cross River, NY DUNS# COC: Pre Carbon LLI Sample # WW LLI Group # Account # Project Name: Route #35 - Cross River, NY Collected: 09/0/20 :35 by MRH Submitted: 09/08/20 09:50 Reported: 09/5/20 :43 Sunoco c/o Matrix Env. Tech. PO Box 427 Orchard Park NY CPR CAS Number Result Program RL GC/MS Volatiles EPA Benzene N.D Ethylbenzene N.D Methyl Tertiary Butyl Ether N.D Toluene N.D m+p-xylene n.a. N.D o-xylene N.D. State of New York Certification 0670 General Sample Comments All QC is compliant unless otherwise noted. Please refer to the Quality Control Summary for overall QC performance data and associated samples. Laboratory Sample Analysis Record VOCs BTEX/MTBE Method EPA Trial# Batch# S255AA Analysis Date and Time 09/2/20 4:55 Analyst Lauren C Temple #=Laboratory MethodDetection Limit exceeded target detection limit N.D.=Not detected at or above the Reporting Limit

10 Page of Sample Description: Mid Carbon Grab Water Route #35 - Cross River, NY DUNS# COC: Mid Carbon LLI Sample # WW LLI Group # Account # Project Name: Route #35 - Cross River, NY Collected: 09/0/20 :30 by MRH Submitted: 09/08/20 09:50 Reported: 09/5/20 :43 Sunoco c/o Matrix Env. Tech. PO Box 427 Orchard Park NY CMD CAS Number Result Program RL GC/MS Volatiles EPA Benzene N.D Ethylbenzene N.D Methyl Tertiary Butyl Ether N.D Toluene N.D m+p-xylene n.a. N.D o-xylene N.D. State of New York Certification 0670 General Sample Comments All QC is compliant unless otherwise noted. Please refer to the Quality Control Summary for overall QC performance data and associated samples. Laboratory Sample Analysis Record VOCs BTEX/MTBE Method EPA Trial# Batch# S255AA Analysis Date and Time 09/2/20 5:2 Analyst Lauren C Temple #=Laboratory MethodDetection Limit exceeded target detection limit N.D.=Not detected at or above the Reporting Limit

11 Page of Sample Description: Post Carbon Grab Water Route #35 - Cross River, NY DUNS# COC: Post Carbon LLI Sample # WW LLI Group # Account # Project Name: Route #35 - Cross River, NY Collected: 09/0/20 :25 by MRH Submitted: 09/08/20 09:50 Reported: 09/5/20 :43 Sunoco c/o Matrix Env. Tech. PO Box 427 Orchard Park NY CPO CAS Number Result Program RL GC/MS Volatiles EPA Benzene N.D Ethylbenzene N.D Methyl Tertiary Butyl Ether N.D Toluene N.D m+p-xylene n.a. N.D o-xylene N.D. State of New York Certification 0670 General Sample Comments All QC is compliant unless otherwise noted. Please refer to the Quality Control Summary for overall QC performance data and associated samples. Laboratory Sample Analysis Record VOCs BTEX/MTBE Method EPA Trial# Batch# S255AA Analysis Date and Time 09/2/20 5:47 Analyst Lauren C Temple #=Laboratory MethodDetection Limit exceeded target detection limit N.D.=Not detected at or above the Reporting Limit

12 Page of Sample Description: Holding Tank Grab Water Route #35 - Cross River, NY DUNS# COC: Holding Tank LLI Sample # WW LLI Group # Account # Project Name: Route #35 - Cross River, NY Collected: 09/0/20 :20 by MRH Submitted: 09/08/20 09:50 Reported: 09/5/20 :43 Sunoco c/o Matrix Env. Tech. PO Box 427 Orchard Park NY CHO CAS Number Result Program RL GC/MS Volatiles EPA Benzene N.D Ethylbenzene N.D Methyl Tertiary Butyl Ether N.D Toluene N.D m+p-xylene n.a. N.D o-xylene N.D. State of New York Certification 0670 General Sample Comments All QC is compliant unless otherwise noted. Please refer to the Quality Control Summary for overall QC performance data and associated samples. Laboratory Sample Analysis Record VOCs BTEX/MTBE Method EPA Trial# Batch# S255AA Analysis Date and Time 09/2/20 6:4 Analyst Lauren C Temple #=Laboratory MethodDetection Limit exceeded target detection limit N.D.=Not detected at or above the Reporting Limit

13 Page of Quality Control Summary Client Name: Sunoco c/o Matrix Env. Tech. Group Number: Reported: 09/5/ at :43 AM Matrix QC may not be reported if insufficient sample or site-specific QC samples were not submitted. In these situations, to demonstrate precision and accuracy at a batch level, a LCS/LCSD was performed, unless otherwise specified in the method. Laboratory Compliance Quality Control Blank Blank Report LCS LCSD LCS/LCSD Result Program Units %REC %REC Limits RPD RPD Max RL Batch number: S255AA Sample number(s): Benzene N.D Ethylbenzene N.D Methyl Tertiary Butyl Ether N.D Toluene N.D m+p-xylene N.D o-xylene N.D Surrogate Quality Control Surrogate recoveries which are outside of the QC window are confirmed unless attributed to dilution or otherwise noted on the Analysis Report. : EPA Method Batch number: S255AA 4-Bromofluorobenzene,2-Dichlorobenzene-d Blank LCS Limits: *- Outside of specification () The result for one or both determinations was less than five times the LOQ. (2) The unspiked result was more than four times the spike added.

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15 Explanation of Symbols and Abbreviations The following defines common symbols and abbreviations used in reporting technical data: RL Reporting Limit BMQL Below Minimum Quantitation Level N.D. none detected MPN Most Probable Number TNTC Too Numerous To Count CP Units cobalt-chloroplatinate units IU International Units NTU nephelometric turbidity units umhos/cm micromhos/cm ng nanogram(s) C degrees Celsius F degrees Fahrenheit meq milliequivalents lb. pound(s) g gram(s) kg kilogram(s) ug microgram(s) mg milligram(s) ml milliliter(s) l liter(s) m3 cubic meter(s) ul microliter(s) < less than - The number following the sign is the limit of quantitation, the smallest amount of analyte which can be reliably determined using this specific test. > greater than J ppm ppb Dry weight basis estimated value The result is the Method Detection Limit (MDL) and < the Limit of Quantitation (LOQ). parts per million - One ppm is equivalent to one milligram per kilogram (mg/kg), or one gram per million grams. For aqueous liquids, ppm is usually taken to be equivalent to milligrams per liter (mg/l), because one liter of water has a weight very close to a kilogram. For gases or vapors, one ppm is equivalent to one microliter of gas per liter of gas. parts per billion Results printed under this heading have been adjusted for moisture content. This increases the analyte weight concentration to approximate the value present in a similar sample without moisture. All other results are reported on an as-received basis. U.S. EPA CLP Data Qualifiers: Organic Qualifiers Inorganic Qualifiers A TIC is a possible aldol-condensation product B Value is <CRDL, but IDL B Analyte was also detected in the blank E Estimated due to interference C Pesticide result confirmed by GC/MS M Duplicate injection precision not met D Compound quantitated on a diluted sample N Spike sample not within control limits E Concentration exceeds the calibration range of S Method of standard additions (MSA) used the instrument for calculation N Presumptive evidence of a compound (TICs only) U Compound was not detected P Concentration difference between primary and W Post digestion spike out of control limits confirmation columns >25% * Duplicate analysis not within control limits U Compound was not detected + Correlation coefficient for MSA <0.995 X,Y,Z Defined in case narrative Analytical test results meet all requirements of NELAC unless otherwise noted under the individual analysis. Measurement uncertainty values, as applicable, are available upon request. Tests results relate only to the sample tested. Clients should be aware that a critical step in a chemical or microbiological analysis is the collection of the sample. Unless the sample analyzed is truly representative of the bulk of material involved, the test results will be meaningless. If you have questions regarding the proper techniques of collecting samples, please contact us. We cannot be held responsible for sample integrity, however, unless sampling has been performed by a member of our staff. This report shall not be reproduced except in full, without the written approval of the laboratory. WARRANTY AND LIMITS OF LIABILITY - In accepting analytical work, we warrant the accuracy of test results for the sample as submitted. THE FOREGOING EXPRESS WARRANTY IS EXCLUSIVE AND IS GIVEN IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED. WE DISCLAIM ANY OTHER WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING A WARRANTY OF FITNESS FOR PARTICULAR PURPOSE AND WARRANTY OF MERCHANTABILITY. IN NO EVENT SHALL LANCASTER LABORATORIES BE LIABLE FOR INDIRECT, SPECIAL, CONSEQUENTIAL, OR INCIDENTAL DAMAGES INCLUDING, BUT NOT LIMITED TO, DAMAGES FOR LOSS OF PROFIT OR GOODWILL REGARDLESS OF (A) THE NEGLIGENCE (EITHER SOLE OR CONCURRENT) OF LANCASTER LABORATORIES AND (B) WHETHER LANCASTER LABORATORIES HAS BEEN INFORMED OF THE POSSIBILITY OF SUCH DAMAGES. We accept no legal responsibility for the purposes for which the client uses the test results. No purchase order or other order for work shall be accepted by Lancaster Laboratories which includes any conditions that vary from the Standard Terms and Conditions, and Lancaster hereby objects to any conflicting terms contained in any acceptance or order submitted by client.