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Soil Gas Investigation—Work Plan <br /> 530 North Stanislaus Street <br /> Stockton,California <br /> Page 2 <br /> Shut-in tests will be performed to ensure that no leaks are present in the sample train. The wells will then be <br /> purged of three void volumes (tubing and sandpack)and sampled using 400 milliliter Summa Canisters at a <br /> flow rate less than and up to 200 milliliters per minute(mL/minute). <br /> During the collection of each soil vapor sample, a leak detection test will be conducted to evaluate whether <br /> there is no intrusion of ambient air into each respective vapor sample. During the collection of each vapor <br /> sample, 1,1-difluoroethane (DFA) will be applied within a shroud placed directly around the sampling <br /> interface at the surface. DFA will be included as a constituent on the chain-of-custody to be analyzed for at <br /> the laboratory. Samples will be collected into 1 Liter Summa Canisters. The cnnisters will be collected <br /> and relinquished under chain-of-custody procedures to a State-certified analytical laboratory. All soil gas <br /> samples will be analyzed by EPA Method TO-15 SIM. <br /> Condor anticipates using a drilling rig equipped with direct push capability, which will minimize soil <br /> cuttings generated during the investigation. Any soil cuttings generated during the investigation will be <br /> placed in a 55-gallon drum or lidded plastic bucket, sealed, labeled, and left on-site pending laboratory <br /> analyses for disposal characterization. All borings will be backfilled with neat cement grout pursuant to <br /> SJCEHD guidelines. <br /> 4.0 REPORTING <br /> Condor will evaluate the laboratory analytical results, qualify the data, and compare results to regulatory <br /> screening thresholds. Condor will prepare a report detailing the investigation including: detailed geologic <br /> logs, laboratory analytical results, and conclusions/recommendations. The deliverables will include one <br /> electronic copy of the report and up to three hard copies, if requested. Additional hard copies can be <br /> included for additional fees, if requested. <br /> Respectfully submitted, <br /> CONDOR EARTH <br /> Luke Castle, PG#9945 <br /> Associate Geologist <br /> X:\Project\9000_pj\9116 HACSJ As-Needed Phase I&II ESAs\9116B Satellite Apartments Phase I ESA\Phase II ESA\Reports\Work Plan\WP <br /> 20240411 530 N Stan.doc <br /> kxtz� <br /> C:QNDOR <br />