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Work Plan, PFAS Site Inspection Naval Computer and Telecommunications Station Stockton, California Technical Approach 3-2 DCN: TRBW-0202-5183-0010 submitted for analysis of PFAS by LC/MS/MS compliant with Table B-15 of QSM 5.3. Sample locations are presented on Figure 17-3 in Appendix A. AOC 02 – Firehouse #2: Install five temporary borings for soil and groundwater collection using direct-push drilling methods in the north parking lot and southwest corner of the site; and collect two sediment samples from the drainage ditch north of Building 117. Samples will be submitted for analysis of PFAS by LC/MS/MS compliant with Table B-15 of QSM 5.3. Sample locations are presented on Figure 17-4 in Appendix A. Site 19 – Construction Debris Pile: Install five temporary borings for soil and groundwater collection using direct-push drilling methods in the central, north, south, west, and northwest areas of Site 19; collect four, five-point composite soil samples from existing stockpiles; and collect one sediment sample from the drainage ditch north of Site 19. Samples will be submitted for analysis of PFAS by LC/MS/MS compliant with Table B-15 of QSM 5.3. Sample locations are presented on Figure 17-5 in Appendix A. AOC 03 – Stormwater Pump House Area: Collect three sediment samples along the drainage channel east of the pump house. Up to two additional sediment samples will be collected if sediment piling is observed; and collect groundwater samples from two existing monitoring wells (W-060 and W-255) and one existing piezometer (P-180). Well W-060 is located east of AOC 03 and south of the drainage channel; well W-255 is located northeast of AOC 03 and north of the drainage channel; and piezometer P-180 is located southwest of AOC 03 and west of the drainage channel. Samples will be submitted for analysis of PFAS by LC/MS/MS compliant with Table B- 15 of QSM 5.3. Sample locations are presented on Figure 17-6 in Appendix A. Analytical results will be compared to the project screening levels presented in Appendix A Worksheet #15. In addition, approximately 25% of soil and sediment samples collected will be analyzed for total organic carbon (TOC) by USEPA SW846 Method 9060A. 3.2 Pre-Work Notifications and Permitting Trevet-Bay West will coordinate access to NCTS Stockton with representatives from the Port of Stockton and their site contractor, Geosyntec. Trevet-Bay West will notify the Port of Stockton, Geosyntec, the Water Board, and the Navy RPM in writing (e-mail) or by phone at least 10 business days prior to when field work is about to commence. 3.3 General Work Requirements 3.3.1 Authorization and Plan Compliance Trevet-Bay West will implement field work in accordance with the approved Work Plan. Significant deviations from the Work Plan will be first approved by the Navy and concurred by the regulatory agencies prior to implementation through a formal field change request. If