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PARSONS 2121 N.California Blvd,Ste 500 1 Walnut Creek,CA 94596 <br /> OF Phone:(925)324-4895 1 www.parsons.com <br /> July 12, 2022 <br /> Jeffrey Wong <br /> San Joaquin County Environmental Health Department <br /> Site Mitigation <br /> 1868 E Hazelton Ave <br /> Stockton, CA 95205 <br /> Subject: Plume Delineation Work plan Addendum <br /> Former ARCO Service Station No.0595 <br /> 6100 N.Hwy 99 Frontage Road <br /> Stockton, San Joaquin County, California <br /> Case Number: 390411 <br /> Dear Mr. Wong: <br /> Parsons, on behalf of Remediation Management Services Company (RMSC), a BP affiliated company, is <br /> submitting this Addendum to the Plume Delineation Work Plan for the above referenced property. The <br /> Work Plan, dated July 15,2020,was submitted to the Central Valley Regional Water Quality Control Board <br /> (CVRQCB) as response to their request in May 2020 to delineate the plume south of MW-13. This <br /> delineation will include drilling three soil borings to the south of MW-13. Each boring will be logged and <br /> a grab groundwater sample will be collected from total depth. No monitoring wells will be installed at this <br /> time. <br /> The workplan provides details on the above field work but neglected to include details on how the soil <br /> borings would be destroyed once the grab groundwater samples have been collected. Once the total depth <br /> is reached, the open borehole will be filled to within a few feet of the ground surface with grout. The grout <br /> mixture will be neat cement. Grout will be emplaced into the borehole using a tremie pipe while <br /> incrementally lifting the drill stems to displace all soil cuttings, debris, and fluids upward and out of the <br /> borehole. Grout will not be allowed to free fall into the borehole. The surface will be completed to match <br /> the surrounding areas which at this time is bare soil. <br /> If you have any questions or require additional information, please contact me at the address above or at <br /> (925)-324-4895. <br /> Sincerely, <br /> qyd-�� <br /> Cynthia Oppenheimer P.G. <br /> Project Manager <br /> cc: John Frankenthal(RMSC) <br /> Parsons Project File <br />