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BLEW <br /> January 6,2026 <br /> San Joaquin County Environmental Health Department <br /> 1868 East Hazelton Avenue <br /> Stockton, California 95205 <br /> Subject: Work Plan for Additional Investigation <br /> 2546 French Camp Turnpike <br /> Stockton, California 95206 <br /> Blew & Associates, P.A. (Blew) has prepared this Work Plan for Additional Investigation (Work Plan) <br /> for submittal to the San Joaquin County Environmental Health Department(EHD)on behalf of FRENCH <br /> CAMP HOLDING CORP. (Client), for the property addressed 2546 French Camp Turnpike, Stockton, <br /> California 95206 (Site) (Figure 1). <br /> BACKGROUND <br /> The Site background is extensively discussed in the Site Characterization and Closure Report prepared <br /> for the Site by Fulcrum Resources Environmental, dated December 11, 2023. (2023 Fulcrum Closure <br /> Report) <br /> In July 2025, prior to case closure and during the public review period, the EHD requested a work plan <br /> and supplemental investigation to evaluate soil vapor along the northern and eastern Site boundaries to <br /> assess potential vapor intrusion into the adjoining residential dwellings. <br /> Blew performed the supplemental soil vapor investigation on November 25, 2025. Soil vapor sample <br /> locations are depicted on Figure 1. The analytical results were evaluated relative to the San Francisco Bay <br /> Regional Water Quality Control Board (SFBRWQCB) Residential Environmental Screening Levels <br /> (ESLs), and are provided in Table 1. <br /> Based on the analytical results,a relatively minor historical release of petroleum constituents is suspected <br /> on-Site proximate to soil vapor sample location SVP-3. The vertical and lateral extent of potential <br /> significant impact to soil, soil vapor and/or groundwater proximate to SVP-3 is currently unknown. <br /> Additionally, based on the soil vapor results at SVP-3 for ethylbenzene (57,000 micrograms per cubic <br /> meter [ug/m3]) and xylenes (320,000 ug/m3), a vapor intrusion concern relative to the northern adjoining <br /> residential dwellings is unable to be ruled out. <br /> This Work Plan has been prepared for EHD review following discussions between Blew and EHD in <br /> December 2025 regarding the findings of the supplemental soil vapor investigation conducted in <br /> November 2025. <br /> Work Plan for Additional Investigation <br /> 2546 French Camp Turnpike,Stockton,CA 95206 1 <br />