Laserfiche WebLink
Phase II ESA—Work Plan <br /> Yosemite Senior Housing Project <br /> Manteca,California <br /> Page 3 <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. The canisters will be collected and relinquished under chain-of-custody procedures to a state <br /> certified Laboratory. All soil gas samples will be analyzed for volatile organic compounds (VOCs) by EPA <br /> Method TO-15 SIM. Borings will be over drilled then backfilled with type I or II neat cement grout upon <br /> completion. <br /> 3.2 SOIL AND GROUNDWATER SAMPLING <br /> Condor will advance up to three (3) borings to an estimated depth of approximately 20 feet bgs to <br /> investigate whether subsurface soil and/or groundwater contamination is evident at the Site. Up to two <br /> soil samples will be collected per boring for the purpose of characterizing the lithology and evaluating <br /> potential contaminants in subsurface soils. Up to three groundwater samples will be collected. Collected <br /> groundwater samples will be analyzed for VOCs by EPA Method 8260. Soil samples will be field <br /> screened using a photoionization detector (PID). If PID readings indicate the presence of volatile <br /> chemicals,then soil samples will be analyzed for VOCs by EPA Method 8062. <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\9116A Manteca Properties Phase I ESA\Phase II ESA\Reports\Work Plan\WP <br /> 20240412 Yosemite Senior Housing.doc <br /> kxtz� <br /> C:QNDOR <br />