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Facility and PBR Units Closure Work Plan <br /> 1848 and 1856 Field Ave., Stockton, California <br /> r <br /> During sample collection in December 2001,Earth Tech collected soil sample BL2-03 (shown on figures as <br /> Location 19) from native soil immediately beneath a crack in the concrete on the edge of the stained area. <br /> ` Chemical analysis of this sample detected 16,000 mg/kg of TRPH. <br /> ` 3.2.3 Petroleum Hydrocarbons on Vacuum Baghouse Pad <br /> The baghouse was located on a concrete pad to the east of 1856 Field Avenue, directly to the north of the <br /> compressor area. The concrete baghouse pad is approximately 14-foot by 23-foot, with some staining by <br /> petroleum hydrocarbons.The staining is apparently from the one air compressor which was located on this pad. <br /> hi December 2001,no sampling related to this potential issue was performed. <br /> 3.2.4 PCBs from PG&E Transformer <br /> r <br /> A transformer reportedly owned by Pacific Gas&Electric(PG&E)is located on a concrete pad a few feet east <br /> of the compressor area. Electrical power routed through this transformer was used by the air compressors. <br /> Apparently, the transformer currently on-site replaced an older PG&E transformer a few years ago. Visual <br /> ` inspections in 1993 and 2001 did not reveal any evidence of leakage or other signs of damage.Furthermore, <br /> there are no records of releases from these transformers in the facility files. This potential issue is driven by <br /> concerns regarding the use and possible release of polychlorinated biphenyls (PCBs) in oil from the <br /> transformers. <br /> If PCBs were released from the transformers,PG&E would be the responsible party.However,the presence of <br /> PCBs would dramatically impact the cleanup and disposal requirements for the adjacent compressor area.In <br /> December 2001,sampling related to this issue was not performed. <br /> r. Given the site was developed in 1982,after the general discontinuation of the use of PCBs as a fire retardant in <br /> electrical equipment,it is extremely unlikely that PCBs were ever present in the transformers.Given there has <br /> been no evidence of a release from the transformers,there does not appear to be a reasonable potential for the <br /> release of PCBs at 1856 Field Avenue.A sample of soil excavated from the compressor area will be analyzed <br /> for PCBs to verify proper disposal procedures are followed.However,no other action is planned with regard to <br /> PCBs from the PG&E transformer. <br /> L:IWOW69099IGener WwldWPiReldAw WPAug03 re 2.dx 10 August 2003 <br /> r <br />