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Soil Gas Sampling Workplan <br /> 601 North Central Avenue <br /> Tracy, California 95376 <br /> Partner Project No. ES22-353833 <br /> October 2, 2025 <br /> • Following sampling activities, the soil gas probes will be destroyed by overdrilling the <br /> boreholes and grouting the boreholes to the ground surface in accordance with the SJCEHD <br /> requirements; <br /> • Analyze each soil gas sample (up to 10 soil gas samples total) for VOCs in accordance with <br /> EPA Method TO-15; and <br /> • Investigation derived waste (IDW) consisting of drill cuttings (soil) and any decontamination <br /> fluids will be temporarily contained in Department of Transportation (DOT)-approved steel <br /> 55-gallon drums. The IDW will be characterized and profiled based on laboratory analysis <br /> results and transported under waste manifest documentation to permitted receiving facilities <br /> for recycling, treatment, and/or disposal. <br /> Signatures of Environmental Professionals <br /> If you have questions regarding this information, please contact Cory Martini at (916) 405-1275. <br /> Sincerely, <br /> Nm 7779 <br /> Cory Martini Bruce Eppler, PG °57, PC 0- <br /> Senior Project Manager Technical Director <br /> Attachments: <br /> Figure 1: Site Plan <br /> Figure 2: Soil Gas Probe Construction Diagram <br /> 3 1 P a g e PARTNER OOOO <br />