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Appendix A-Sampling and Analysis Plan BSK Project E19-016-01F Stockton Metropolitan Airport(SCK) March 1, 2023 Stockton, California Page 7 Subsurface soil samples will be collected continuously using a split spoon sampler to obtain samples for chemical analysis and lithologic characteristics. Lithologic characteristics of the soil will be logged in accordance with the Unified Soil Classification System (USCS). Lithologic logs will be recorded on a soil boring log. A photoionization detector (PID) will be used to screen the soil samples for volatile organic compounds(VOCs)during field activities. A blank soil boring log is presented in Appendix A-A. The boring logs will be prepared for each soil boring. The following information will also be generally recorded on the soil boring logs: • Depth (total and any other relevant depth information) • USCS classification (ASTM D2487-17) • Color • Moisture content(i.e., dry, moist, wet, saturated) • Density(relative to soils found on site) • Depth to groundwater, if encountered • Indications of contamination, if any • Other observations as needed The following approximate depth intervals are proposed for collection of subsurface soil samples for chemical analyses in the shallow DPT, monitoring wells, and vertical groundwater definition borings: • 1.0 ft below ground surface (bgs) or directly beneath pavement, if present • 5.0 ft bgs • 10.0 ft bgs In addition to the sample intervals listed above,two (2) DPT borings in PRA 1 which BSK plans to advance to depths greater than 10 ft bgs for vertical definition of soil will be sampled for chemical analysis every 5 ft, once the 10 ft sample has been collected (i.e., 15 ft, 20 ft, 25 ft, etc.,) down to the total depth (i.e., 40 ft bgs) of the boring. These DPT borings will be located near the former boring B-19 and between former borings, TW-4 and B-18. For the exact proposed locations and depths of these borings, please refer to Figure 3 of BSK's Workplan of which this SAP is an appendix. Soil cores will be opened after retrieval for analytical sample collection and transferred to laboratory supplied sample bottles. Laboratory supplied sample bottles are described in Table A-2 of this SAP. Alternatively, if the samples are cut directly from the acetate liner, the sample interval will be selected, cut out using a clean hack saw and capped with tight fitting vinyl endcaps (without the use of Teflon sheeting), then labeled with relevant sample information (i.e., sample ID, date, time, analysis, etc.,). Teflon° strips will not be used as they contain PTFE. Sample homogenization will be performed by the analytical laboratory. Project staff will coordinate with the analytical laboratory to ensure that appropriate handling procedures are used at the laboratory to obtain representative soil sample results during homogenization. v a