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® Ca AVIN I`IEWSOM <br /> C'CJVFHN(]H <br /> Water Boards ENV E GAR CIA <br /> ENVIRONMENTAL PROTECTION <br /> Central Valley Regional Water Quality Control Board <br /> 20 April 2023 <br /> Mr. Rajinder Sharma Mr. and Mrs. Mohammad and Wafa Matar <br /> Sharma Family Trust 1901 South El Dorado Street <br /> 33215 Falcon Drive Stockton, CA 95206 <br /> Freemont, CA 94555 <br /> Ms. Nasheem Khan <br /> 5925 Terminal Apartment 1 <br /> Riverbank, CA 95367 <br /> REVIEW OF ADDITIONAL OFF-SITE GROUNDWATER INVESTIGATION, QUICK-N- <br /> SAVE#1 (T0607700903), 1901 SOUTH EL DORADO STREET, STOCKTON, SAN <br /> JOAQUIN COUNTY <br /> Dear Mr. Sharma, Ms. Khan, and Mr. and Mrs. Matar, <br /> Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff <br /> reviewed the Additional Off-Site Groundwater Investigation (Report) dated <br /> 3-March 2023, submitted on your behalf by Frey Environmental, Inc. (Frey). The <br /> Quick-N-Save #1 case is located at 1901 South El Dorado Street in Stockton (Site). <br /> In the Report, Frey presented results of depth discrete grab groundwater sampling from <br /> borings CPT-9 through CPT-12. Petroleum hydrocarbons were detected in grab <br /> groundwater samples at maximum concentrations of 7,000 micrograms per liter (pg/L) <br /> total petroleum hydrocarbons as gasoline (TPH-G), 2,880 pg/L benzene, and 176 pg/L <br /> naphthalene. <br /> Based on the results of depth discrete grab groundwater sampling, Frey recommended <br /> additional plume delineation by installing two groundwater monitoring wells. Central <br /> Valley Water Board staff concurs with additional delineation at the Site. By <br /> 15 June 2023, please submit a work plan presenting a scope of work for additional <br /> groundwater delineation that addresses the comments below: <br /> 1. Installation of a groundwater monitoring well is needed to the northeast of boring <br /> CPT-12 that monitors groundwater at 105 foot below ground surface (ft bgs). <br /> MARK BRADFORD, CHAIR I PATRICK PULUPA, ESQ., EXECUTIVE OFFICER <br /> 11020 Sun Center Drive#200, Rancho Cordova, CA 95670 1 www.waterboards.ca.gov/centralvalley <br />