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PrelimitEnvironmental Assessment Work Plan Pittman Elementary school April 21,2003 Revised July 2,2003 Page 5 Polychlorinated Rz hent lc—Sampling Scheme 6(Figure 5) Discrete surface and subsurface soil samples will be collected from two locations around each of the four electrical switching stations (transformers) and the Pacific Gas & Electric substation. Discrete samples will be collected at the surface (0 — 6 inches) and the deeper subsurface (2.0 — 2.5 feet). The surface samples will be analyzed for polychlorinated biphenyls (PCBs) by EPA Method 8082. The deeper discrete subsurface samples will be archived frozen by the laboratory pending analytical results of the surface samples. Second discrete surface and subsurface soil samples will be collected from one sample location for quality assurance/quality control. These samples will not be identifiable to the laboratory. The second samples will be prepared in an identical manner and analyzed for the same analytes as their primary counterparts. The general sample locations, sample types, and associated analyses are listed in Table 3. The proposed soil sample locations are shown in Figure 5,Appendix A. Table 3—Sam les and Anal ses—PCBs Location Depths Matrix Total Number of Discrete p Samples Samples Analyses Methods 2 locations downgradient on pad 0-0.5 and 2-2.5 feet bgs soil 8 surface g pCBs 8082 per switching station(4 stations) (hold 8 deep) 2 locations at PG&E substation 0-0.5 and 2-2.5 feet bgs soil 2 surface 2 PCBs 8082 (hold 2 deep) 1 second sample 0-0.5 and 2-2.5.feet bgs soil 1 surface 1 PCBs 8082 (hold I deep) 1 e ui ment blank water 1 1 PCBs 8082 -- Hydraulic Elevator—Sampling Scheme. 7 (Ei tgt r. 7) A product sample will be collected from the leaking hydraulic oil spilled on the concrete floor of the control room adjacent to the elevator located in the warehouse building. The sample will be analyzed for -- PCBs by EPA Method 8082 and CAM 17 Metals by EPA Methods 6010B and 7471A. 3.2.2 Sampling Procedure Soil Samples—Pe-sticidrs and Metals Samples collected from lawn areas and structure driplines will be collected at the surface by loosening the soil with a stainless steel shovel. A stainless steel spoon will be used to place the loose soil into laboratory-supplied glass jars. The deeper subsurface samples will be collected at each sample location by using a stainless steel hand auger and transferring the soil directly from the hand auger into laboratory-supplied glass jars. The deeper sub-surface samples shall be retained for potential analyses pending the results of the surface samples. Samples collected from the track area will be collected directly from the backhoe bucket or from the segregated debris piles. Each jar will be labeled for sample identification and placed in a cooler chilled with ice. Prior to use at each soil sample location, all - sampling equipment will be decontaminated in the field with a solution of laboratory-grade, non- phosphate detergent and deionized water and then rinsed. Following the sampling of each sampling scheme and the decontamination of the equipment, an equipment blank sample will be collected. A i, CONDOR