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GAVIN NEWSOM <br /> GOVERNOR <br /> CALPORMIA JARED BLUMENFELO <br /> SECRETARY POR <br /> Water Boards ENVIRONMENTAL PROTECTION <br /> Central Valley Regional Water Quality Control Board <br /> 10 February 2022 <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 /> Request for Additional Assessment Report, Arco #0595 (T0607700319), <br /> 6100 Highway 99 North Frontage Road, Stockton, San Joaquin County <br /> Dear Mr. Frankenthal, <br /> Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff <br /> reviewed the Fourth Quarter 2022 Semi-Annual Groundwater Monitoring Report <br /> (4Q2021 Report) dated 31 January 2022 and the Technical Memo (Memo) dated <br /> 28 April 2021, both submitted on your behalf by Parsons. The 4Q2021 Report was <br /> titled "Fourth Quarter 2022...", however the groundwater monitoring event discussed in <br /> the report was performed during the fourth quarter 2021; the year of 2022 in the <br /> document title is a typo. Arco #0595 is located at 6100 Highway 99 North Frontage <br /> Road in Stockton (Site). <br /> In the Memo, Parsons recommended modifying the scope of work presented in <br /> 15 July 2020 Plume Delineation Work Plan, which Central Valley Water Board staff <br /> concurred with in a letter dated 3 September 2020. Parsons proposes to advance and <br /> sample groundwater from the borings as originally proposed and to postpone well <br /> installation, pending groundwater sample results. Central Valley Water Board staff <br /> concurs with your proposed modifications to the scope of work. Please submit a results <br /> report by 31 May 2022. <br /> In the 4Q2021 Report, Parsons recommended discontinuing sampling from the irrigation <br /> and domestic wells. Central Valley Water Board staff concurs with this <br /> recommendation. Central Valley Water Board staff may request additional groundwater <br /> sampling from the domestic and irrigation wells in the future. <br /> DENISE KADARA, ACTING CHAIR I PATRICK PULUPA, EXECUTIVE OFFICER <br /> 11020 Sun Center Drive#200, Rancho Cordova,CA 95670 1 www.waterboardB.ca.gov/centralvalley <br />