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CONDOR EARTH <br /> y 188 Frank West Circle,Suite I <br /> Stockton,CA 95206 <br /> 209.234.0518 <br /> Fax 209.234.0538 <br /> CONDORwww.condorearth.com <br /> TECHNICAL MEMORANDUM <br /> JANUARY 15,2026 <br /> REVIEW OF SITE WORK PLAN FOR ADDITIONAL INVESTIGATION <br /> 2546 FRENCH CAMP TURNPIKE, STOCKTON, CALIFORNIA 95206 <br /> SITE INFORMATION <br /> Cleanup Program Site Case#PR0547561 GeoTracker Global ID: T10000019802 <br /> Site Name: Address(Site): <br /> French Camp Holding Corp 2546 French Camp Turnpike <br /> Stockton CA 95206 <br /> Local Officer Information: Licensed Professional Information: <br /> Frank Girardi Condor Earth <br /> Lead Sr.REHS,RDI John Lane,CA PG No.6795 <br /> San Joaquin County Environmental Health (ilane(gcondorearth.com) <br /> Department <br /> fvjzirardiAsijzov.org Luke Castle,CA PG No.9945 <br /> 209.953.6213 (Icastle_,condorearth.com) <br /> SITE RESOURCE INFORMATION <br /> This Technical Memorandum was prepared by Condor Earth(Condor)at the request of San Joaquin County <br /> Environmental Health Department (EHD)to document Condor's review of the Work Plan for Additional <br /> Investigation,2546 French Camp Turnpike,Stockton, California 95206,dated January 6,2026(Work Plan) <br /> prepared by Blew&Associates,P.A. (BLEW). <br /> SITE BACKGROUND SUMMARY <br /> The Site background is discussed in further detail in previous reports and is available for review on <br /> GeoTracker'. <br /> In a letter dated July 3,2025, EHD indicated that the Site was eligible for a Certificate of Completion for <br /> Site Closure following its review of the Site Characterization and Closure Report for 2546 French Camp <br /> Turnpike,Stockton,California(Fulcrum Resources Environmental,December 11,2023).During the public <br /> comment period, a comment was submitted by the owner of one of the northwestern adjoining residential <br /> properties expressing concern about potential impacts from remaining Site contaminants.EHD determined <br /> that insufficient data were available to adequately assess potential off-site risks to sensitive receptors. <br /> Consequently,EHD requested a work plan and supplemental investigation to evaluate soil vapor conditions <br /> along the northern and eastern property boundaries to assess a potential vapor encroachment condition <br /> (VEC)for the adjoining residential dwellings. <br /> Blew performed the supplemental soil vapor investigation on November 25, 2025. The analytical results <br /> were evaluated relative to the San Francisco Bay Regional Water Quality Control Board (SFBRWQCB) <br /> Residential Environmental Screening Levels(ESLs)and are provided in Table 1 of the Work Plan. <br /> 1 https:Hjzeotracker.waterboards.ca.goy//Rrofile_renort.asp• Ig obal id=T10000019802 <br />