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GAVIN NEWSOM <br /> GWFIiNOH <br /> csu Foxxia YANA GARCIA <br /> SE Water Boards �■/ ENVIRONMENTAL <br /> FOR <br /> ENVIRONMENTAL PROTECTION <br /> Central Valley Regional Water Quality Control Board <br /> 12 July 2023 <br /> Atul & Suman Batra <br /> 91 Los Altos Drive <br /> Hollister, CA 95203 <br /> REQUEST FOR MEETING AND REVISED WORK PLAN, HESS-DUBOIS CLEANERS <br /> (FORMER); 348 WEST HARDING WAY, STOCKTON, SAN JOAQUIN COUNTY; <br /> LUST CASE GLOBAL ID: T0607700483, CLEANUP CASE GLOBAL ID: <br /> SLT5S1553195 <br /> Central Valley Water Board staff reviewed the Site Assessment Work Plan (Work Plan), <br /> dated 3 July 2023. Advanced Geo Inc. (AGI) submitted this document on your behalf <br /> for the following active cases at 348 W. Harding Way in Stockton (Site): <br /> • Leaking Underground Storage Tank (LUST) case #390621 <br /> • Site Cleanup Program (SCP) case #SLT5S155. <br /> Central Valley Water Board staff does not concur with the proposed scope of work and <br /> has the following comments: <br /> 1. In the Work Plan, AGI references the February 2020 Supplemental Guidance: <br /> Screening and Evaluating Vapor Intrusion, Draft for Public Comments. <br /> Department of Toxic Substances Control (DTSC) has since finalized the <br /> guidance in their February 2023 Supplemental Guidance: Screening and <br /> Evaluating Vapor Intrusion, Final Draft (2023 Guidance). Please refer to the <br /> 2023 Guidance when performing evaluation of vapor intrusion risk. <br /> 2. In the Work Plan, AGI proposes to collect a crawl space sample under the house <br /> of the adjacent residence, and three surrounding outdoor ambient air samples. <br /> AGI proposes to collect the crawlspace sample under the northwest corner of the <br /> house. Staff concurs with a crawl space air sample in lieu of an indoor air <br /> sample that staff requested. However, the northeast corner of the house is <br /> closest to soil gas well SG2 which contained high concentrations of chlorinated <br /> volatile organic compounds (CVOCs) tetrachloroethylene (PCE) and <br /> trichloroethylene (TCE). In order to most effectively evaluate the vapor intrusion <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 />