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GAVIN NEWSOM <br /> GOVERNOR <br /> CR LIFORRI• YANA GARCIA <br /> Water Boards ENVIRONMEARYNTAL <br /> FOR <br /> ENVIRONMENTAL PROTECTION <br /> Central Valley Regional Water Quality Control Board <br /> 15 October 2024 <br /> Lisa Waskom <br /> Director of Operations <br /> Glenn Springs Holdings, Inc. <br /> 5 Greenway Plaza, Suite 110 <br /> Houston, TX 77046 <br /> REVIEW INVESTIGATION AND WELL INSTALLATION WORK PLAN, <br /> J.R. SIMPLOT COMPANY(T0607700166), <br /> 16777 SOUTH HOWLAND ROAD, LATHROP, SAN JOAQUIN COUNTY <br /> Central Valley Water Board staff (Water Board staff) reviewed the Site Investigation and <br /> Well Installation Work Plan (Work Plan) dated 30 September 2024. Arcadis U.S. Inc. <br /> (Arcadis) submitted the Work Plan on your behalf for the leaking underground storage <br /> tank (UST) case located at 16777 South Howland Road in Lathrop (Site). Arcadis <br /> submitted the Work Plan in response to the 11 June 2024 Water Board staff letter. In <br /> the Work Plan, Arcadis proposes to install two new groundwater monitoring wells and <br /> advance three soil borings. Water Board staff concurs with the activities proposed in the <br /> Work Plan. <br /> In the Work Plan, Arcadis proposes installing replacement monitoring well MW-1 R near <br /> the former MW-1 well location and installing MW-4 near the center of the former USTs. <br /> Arcadis proposes to install each monitoring well to a total depth approximately five feet <br /> below first encountered groundwater (groundwater is observed onsite around 20 feet <br /> below ground surface [bgs]). Arcadis also proposes to advance borings BH-1 B, BH-2B, <br /> and BH-3B co-located with their respectively named historical borings (BH-1, BH-2, BH- <br /> 3). Arcadis proposes to advance the soil borings to approximately 35 feet bgs. Arcadis <br /> states that the analytical results collected from co-located monitoring wells and borings <br /> will confirm the current concentration of petroleum hydrocarbons in soil and <br /> groundwater which were last evaluated in 1989. Arcadis proposes to collect <br /> groundwater samples quarterly for two years and to submit an annual report of quarterly <br /> data before 15 February each year. <br /> Water Board staff requests semi-annual groundwater reporting. The purpose of the <br /> activities proposed in the Work Plan is to reestablish a baseline understanding of <br /> petroleum hydrocarbon distribution in soil and groundwater. Semi-annual groundwater <br /> reporting will provide you, your consultant, and Water Board staff with the opportunity to <br /> identify potential data gaps and/or additional investigation needs in a timely manner. <br /> directions regarding groundwater monitoring and reporting frequency: <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 />