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WORKPLAN SUMMARY <br /> Bellota Substation <br /> Site Visit: September 4, 2007 <br /> Site Description and History <br /> • Substation site located on the south side of Flood Road in Bellota, CA (Figure <br /> 2A) <br /> • Currently major building structures includes a transformer repair building with <br /> associated transformer handling tower, a control building, a warehouse, and a <br /> switching structure; remainder of site contains electrical equipment, and is largely <br /> unpaved (i.e., gravel base) (Figure 2A) <br /> • Identified Key Oil Handling Features: Based on historical PG&E plans and the <br /> site visit, key features include: an existing transformer repair building, an existing <br /> transformer handling tower and associated tracks between the building and tower, <br /> and two former mineral oil ASTs and associated pump house (Figure 2A). <br /> Previous Environmental Investigations/Removals <br /> • Based on an onsite interview with Mr. Mark Garcia of PG&E, former <br /> underground piping previously moved mineral oil between the two ASTs and the <br /> breakers along the southeast site boundary. The underground piping, two ASTs <br /> and associated pump house were previously removed. <br /> Proposed Sampling Activities <br /> • Collect a total of 18 soil samples from 6 borings drilled to a total depth of 10 feet <br /> bgs. Collect one grab groundwater sample (if encountered). Analyze all samples <br /> for: <br /> o Extractible TPH (Carbon Chain) by EPA Method 8015M <br /> o CAM 17 metals by EPA Method 6010B/7470A <br /> o PCBs by EPA Method 8082 <br /> • See Table 2 for detailed soil sampling program and rationale and Figure 2B for <br /> sample locations <br /> Page 2 of 7 <br />