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Additional Soil Vapor Assessment Work Plan Page 10 <br /> CPSA,Lodi,California <br /> March 22,2024 <br /> SCHEDULE AND REPORT PREPARATION <br /> CHT and the City request the Water Board's concurrence with our Work Plan to perform the <br /> ASVA activities at the proposed locations at your earliest convenience. ASVA activities will be <br /> conducted within six (6) weeks of receipt of the location access letters, pending availability of a <br /> driller to install the TSV and SS probes. Laboratory sample results should be available within a <br /> week following sample submission. <br /> A letter report documenting the ASVA activities, a summary of the results, and conclusions and <br /> recommendations for future work will be prepared and submitted to the Water Board within two <br /> (2)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 F1yDRO TLCU <br /> Varinder Oberoi, PE C69037 <br /> Principal Hydrologist <br /> Figures: <br /> Figure 1 — Central Plume Source Area Location Map <br /> Figure 2 — Central Plume Source Area(CPSA) <br /> Figure 3 — Results of Soil Vapor Assessment—March 2023 <br /> Figure 4 — Proposed Discrete Depth, Sub-Slab, &Indoor Air Sample Locations <br /> Attachments: <br /> Attachment A— Standard Operating Procedure (SOP) — Sub-slab Vapor Pin® Sampling Device <br /> Installation, Leak Detection, Sampling, &Extraction <br /> Attachment B—Beacon Environmental—Collection of Samples using Sorbent Tubes <br /> 581 MONTEGO TERRACE,SUNNYVALE,CA 94089 TEL:415-424-3009 <br />