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Chevron - 3 - 12 March 2026 <br /> Surland Homes <br /> Tracy, San Joaquin County <br /> are less than the 2026 residential screening criteria, Arcadis will recommend moving <br /> forward with Site closure. If soil vapor concentrations have not attenuated and remain <br /> above residential screening criteria, Arcadis will evaluate the need for additional vapor <br /> intrusion assessment. <br /> Staff Comments <br /> In an email dated 5 March 2026, regarding the decommissioning of soil vapor probe <br /> SV-1 , Arcadis stated that "depending on what the results look like we may propose <br /> another round of sampling i.e. one sample point from the wet season and one during <br /> the dry season. Immediately following the investigation, the probe would remain in place <br /> while we wait for data to determine if additional soil vapor evaluation is warranted." <br /> Chevron needs to submit the soil and vapor analytical results from SV-1 for Staff <br /> review, with an explanation if decommissioning of SV-1 is recommended. <br /> Chevron needs to provide Staff with timely updates regarding property access <br /> and scheduling of the Site work. The soil vapor assessment work needs to be <br /> conducted in accordance with the Department of Toxic Substances Advisory—Active <br /> Soil Gas Investigations July 2015 guidance document. The scope of work outlined in the <br /> Work Plan appears to be appropriate with the comments noted above. <br /> By 3 July 2026, please submit the Site assessment report. <br /> If there are questions regarding this correspondence, lease contact Brian Hit? at 5,59) <br /> q..�.... .,0 g p , p <br /> 445-5170 or by email at Brian.Hitz@waterboards.ca.gov. <br /> Brian Hitz Shelton R. Gray <br /> Engineering Geologist Senior Engineering Geologist <br /> PG No. 9379 <br /> AL <br /> an <br /> k <br /> No.9378 <br /> 9�. <br /> FpF A — <br /> cc: San Joaquin County Environmental Health Department, Stockton <br /> Christine Perez, Arcadis U.S., Inc., Portland, Oregon (email) <br /> Joel Mattecheck, Arcadis U.S., Inc., Phoenix, Arizona (email) <br /> Aubrey Waddail, Chevron Asset Retirement, Houston, Texas (email) <br />