ARCHIVED REPORTS_PHASE II ENVIRONMENTAL SITE ASSESSMENT

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\W1GIR so'iu ldh1wcoit, )Inc. uncovered by heavy equipment, creating a high potential for rupture and PCB release. It is also possible these items may be handled and loaded without being discovered. The PG&E substation along the south side of the site contains a transformer containing PCBs. No indication of a PCB release in this area was detected, and the substation appeared to be adequately maintained with a perimeter chain link and barbed wire fence. However, the power lines to the substation are disconnected indicating it is an inactive substation. It was noted that there were areas along the south side of the fencing where it appeared animals had dug under the fence leaving gaps. The south side of the fence was also noted to extend directly along the top of the South Ditch bank. The known and potential PCB impacts were identified as RECs. Although the August 2007 PCB spill near the former shredder and mill are under investigation and remediation by Miller Brooks, B-7 was located as near as possible to the remedial excavation and former location of the shredder to provide independent investigation of this area. Additionally, all of the samples collected during the Phase II ESA were analyzed for PCBs due to the possibility of PCB contamination in any area of the site. The PG&E substation was not specifically targeted since it appeared to be in good condition and was not identified as one of • the most significant RECs. However, B-12, which targeted a depressed area, was located in relatively close proximity to the PG&E substation. 5.4.5 Surface Staining and Documented Petroleum Releases Records from the DTSC, SJCEHD and the Port of Stockton documented several small petroleum releases to the ground surface of the site. Although they were all reported to be cleaned up, soil sampling and analysis were not conducted at the time of the spills to verify this. The specific locations of these spills are unknown. Use of absorbent pads to remove oil accumulating on the ground is currently a best management practice at the facility, suggesting oil releases are not uncommon. Hay bales with dark staining were observed during the site reconnaissance. Surface staining of the soil was noted in many areas of the site, particularly around the welding shop, maintenance shop, equipment wash pad, container storage area, motor block stockpiles, equipment and vehicle parking areas, and the AST area. Oily surface staining was also observed on the concrete floors of the warehouse, welding shop, maintenance shop, wash pad and container storage area. The soil and concrete staining is dark as would be expected from oil or other heavy petroleum products, but was not identifiable based only on visual inspection. • 704. PRI.05 9 July 21, 2008