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Geosyntec O consultants 3.3 Scope of Soil Sample Collection Soil samples will be collected from depths of 0-0.5 ft bgs, 1-1.5 ft bgs, 3-3.5 ft bgs, and 5-5.5 ft bgs at locations S-1 through S-5 (Figure 2), consistent with the protocol described in the 2018Annual Groundwater Monitoring Report(Geosyntec,31 October2018). Consistent with the sampling methodology used in earlier soil sampling events by the Source Group Incorporated and Geosyntec, soil sampling will be conducted using a hand auger and slide hammer at the five locations indicated in Figure 2. The hand auger will be advanced into the soil until the appropriate sample depth is reached, at which point a slide hammer will be driven into undisturbed soil until a 6-inch stainless-steel sampling tube is completely filled. The sample tubes will then be covered with Teflon, capped at each end, labeled, immediately placed in a cooler with ice, and transported to Eurofins-Calscience Laboratory (Eurofins) under a chain-of-custody. After the five borings have been advanced to terminal depth and all required samples collected, each boring will be kept open with a six-foot length of/2-inch PVC pipe until the end of the day, so that a grout inspector from the SJCEHD can observe grouting of each boring. Borings will then be grouted to surface with neat cement using the tremie method or free fall while in the presence of the grout inspector. 3.4 Analytical Testing Method for Collected Soil Samples Eurofins will analyze the soil samples for ammonia as nitrogen (NH3-N) by EPA Method 350.1, nitrate as nitrogen (NO3-N) by EPA Method 353.2, and pH by EPA Method 9045C. Consistent with the soil sample protocol used in earlier soil sampling for nitrogen, including the 2020 Annual Groundwater Monitoring and Sampling Report (Geosyntec, 31 October 2020), a QA/QC soil sample will be collected as a "blind" field duplicate at one sampling location. 3.5 Disposal of Investigation Derived Waste Soil cuttings generated during the course of sample collection will be managed as investigation derived waste (IDW) and will be transferred to new clean 55-gallon drums and stored in an area of the site designated by GSH. Thereafter, Geosyntec will subcontract and coordinate with American Integrated Services, Inc. (a waste management subcontractor approved by GSH) for off-site disposal within 90 days of IDW generation. 2024 TR0712 Stockton Soil Sampling Work Plan 3 2024.08.2