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GROUND ZERO <br /> ANALYSIS, INC. <br /> 1172 Kansas Avenue,Suite A <br /> Modesto,CA 95351 <br /> 209.522.4119-PH <br /> 209.522.4227-FAX <br /> groundzeroana lysis.com <br /> Via Electronic Delivery <br /> December 27,2023 <br /> Ms. Vera Fischer <br /> California Regional Water Quality Control Board, <br /> Central Valley Region <br /> 11020 Sun Center Dr. #200 <br /> Rancho Cordova, CA 95670 <br /> Subject: Additional Investigation Workplan <br /> Stallworth Auto Sales, 602 N. California St., Stockton, CA <br /> Geotracker Global ID T0607700523 <br /> Dear Ms. Fischer: <br /> We are writing on behalf of Stallworth Auto Sales (RP) to present you with a workplan for <br /> additional site investigation. In a letter dated September 19, 2023 Regional Water Quality <br /> Control Board (RWQCB) staff suggested that the Responsible Party participate in the <br /> Expedited Claims Account Program (ECAP) and specified certain investigative activities that <br /> should occur to resolve data gaps hindering case closure. Those activities are: <br /> • Install a downgradient, intermediate zone, monitoring well to complete the definition <br /> of the plume of groundwater contamination. <br /> • Conduct shallow soil sampling in the vicinity of the former fuel USTs to evaluate the <br /> potential human health risk due to direct soil contact. <br /> • Collection of soil gas samples between monitoring wells MW-IA/MW-IB and the site <br /> building to evaluate the potential risk to indoor air. <br /> The RP entered the ECAP and a remote Joint Execution Team (JET) meeting was held with <br /> representatives of the RWQCB, and the SWRCB on November 27, 2023. It was agreed that a <br /> workplan addressing the above issues would be submitted in December 2023. <br /> Copies of the RWQCB letter and the JET meeting notes are included in Attachment A. <br /> ADDITIONAL SITE INVESTIGATION WORKPLAN <br /> The proposed workscope consists of groundwater monitoring well installation, shallow soil <br /> sampling and soil gas sampling. <br /> Stallworth Workplan Text <br />