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West Clay Property - 2 - 29 August 2023 <br /> waste oil storage, a potential source of VOCs existed at the site and additional <br /> investigation is warranted to determine if the case meets Low-Threat Closure Policy <br /> General Criteria b, The unauthorized release consists only of petroleum, and Criteria e, <br /> A conceptual site model that assesses the nature, extent, and mobility of the release <br /> has been developed. <br /> By 30 October 2023, please submit a work plan for the collection of shallow soil <br /> samples around the former 1,000-gallon waste oil UST. In the work plan, please <br /> propose shallow soil sample locations to assess for the presence of PAHs. Please also <br /> plan to analyze the shallow soils for VOCs, per the Leaking Underground Fuel Tank <br /> (LUFT) Manual and the waste oil contents of the former 1,000-gallon UST. <br /> By 27 November 2023, please submit a written report discussing the analytical results <br /> of groundwater samples collected from the wells listed below. Please analyze all <br /> samples for full scan VOC analysis to determine if VOCs potentially released from the <br /> former 1,000-gallon waste oil UST impacted groundwater. In the report, please evaluate <br /> the onsite risks posed by VOCs in groundwater, if detected, as well any risks posed to <br /> downgradient receptors. Also, if VOCs are detected, please propose a path forward to <br /> address the VOC release. Please sample only the following ten (10) wells: MW-1, MW- <br /> 2, MW-3, MW-7, MW-8A, MW-8B, MW-25, MW-27, MW-29, and MW-30. <br /> If you have any questions or comments about this letter, please contact Michael <br /> DeSmet at (916) 464-4830 or michael.desmet(a-),waterboards.ca.gov. <br /> Michael DeSmet, PG Galvin Kauffman, PG <br /> Engineering Geologist Senior Engineering Geologist <br /> o <br /> CL <br /> DeSmet �^ <br /> 9199 954� <br /> cc: Daniel Villanueva, AdvancedGeo Inc. (email) <br /> DSS Company Corp, 655 W Clay Street, Stockton, CA 95206 <br />