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Soil Vapor Assessment Work Plan Page 9 <br /> CPSA,Lodi,California <br /> January 11,2023 <br /> The PSG samplers will be left in place for a period of 14 days, after which they will be retrieved <br /> using the protocol recommended by Beacon, and the sampling holes patched with asphalt as <br /> appropriate. Following retrieval of the PSG samples from the sampling locations,the samples will <br /> be transported under Chain-of-Custody(COC) documentation to Beacon's laboratory. Each COC <br /> will include the sample ID, date and time of emplacement and retrieval (to nearest minute), type <br /> of surfacing and approximate thickness, and other relevant information (e.g., surfacing material, <br /> proximity to potential source areas). All samples will be analyzed using thermal desorption-gas <br /> chromatography/mass spectrometry (TD-GC/MS) instrumentation following U.S. EPA Method <br /> 8260C, with laboratory results provided in micrograms per cubic meter(µg/m3). <br /> The methodology and protocol for performing `Passive Soil Gas Investigations'using the Beacon <br /> BeSure Sample Collection Kits'is provided in Attachment C. <br /> SCHEDULE AND REPORT PREPARATION <br /> CHT and the City request the Water Board's concurrence with our Work Plan to perform the SVA <br /> activities at the proposed locations at your earliest convenience. SVA activities will be conducted <br /> within three (3) weeks of receipt of the location access letters. Laboratory sample results should <br /> be available within a week following sample submission. <br /> A letter report documenting the SVA activities, a summary of the results, and conclusions and <br /> recommendations for future work will be prepared and submitted to the Water Board within six <br /> (6)weeks of receipt of the laboratory analysis. A copy of the report and associated laboratory and <br /> borehole information will be uploaded to GeoTracker. <br /> Please do not hesitate to contact Varinder Oberoi at (415)424-3009 with any questions regarding <br /> this Work Plan. <br /> Sincerely, <br /> CIVIL FiyDIRC TECH <br /> Varinder Oberoi, PE C69037 <br /> Principal Hydrologist <br /> 649 DISTEL DRIVE,LOS ALTOS,CA 94022 TEL:415-424-3009 <br />