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IP—RZ, <br /> GAVIN NEWSOM <br /> GOVERNOR <br /> C0.LI i0 R LI I• JAIREo NFELD <br /> SECRETARRY FOR <br /> Water Boards ENVIRONMENTAL PROTECTION <br /> Central Valley Regional Water Quality Control Board <br /> 3 September 2020 <br /> Mr. John Frankenthal <br /> Liability Manager <br /> Remediation Management Services Group <br /> 150 West Warrenville Road, MC 600 1015F <br /> Naperville, IL 60536 <br /> Plume Delineation Work Plan, Former ARCO Service Station No. 0595, 6100 North <br /> Highway 99 Frontage Road, Stockton, San Joaquin County <br /> Dear Mr. Frankenthal, <br /> Central Valley Regional Water Quality Control Board (Central Valley Water Board) <br /> staff reviewed the Plume Delineation Work Plan (Work Plan) dated 15 July 2020, <br /> submitted on your behalf by Parsons (Parsons). The Former ARCO Service Station <br /> #0595 is located at 6100 Highway 99 Frontage Road in Stockton (Site). <br /> In the Work Plan, Parsons proposes to advance three borings to the south/southwest of <br /> well MW-13 and collect a grab groundwater samples from each boring. Based on grab <br /> groundwater results, Parson proposes to install a monitoring well at the southern most <br /> boring where grab groundwater analytical results are all non-detect. <br /> Central Valley Water Board staff concur with the scope of work presented in the Work <br /> Plan. Prior to installation of the proposed monitoring well, please contact me to discuss <br /> grab groundwater results and the proposed. Please submit a results report by 31 <br /> December 2020. <br /> KARL E. LONGLEY SCD, P.E., CHAIR I PATRICK PULUPA, ESQ., EXECUTIVE OFFICER <br /> 11020 Sun Center Drive#200, Rancho Cordova, CA 95670 1 www.waterboards.ca.gov/centralvalley <br />