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Site Closure Report 4 Former Claude C.Wood Construction Yard,681 East Lockeford Street,Lodi,CA November 16, 1999 3.0 WASTE OIL TANK REMOVAL AND SOIL EXCAVATION In 1993 contractors performed primary demolition of buildings and other structures including the removal of the above ground storage tank(AST) farm located immediately west of the structure labeled "Repair Shop" (Figure 2). In April 1994,during the removal of surface concrete structures within the former above ground tank farm containment area, ASTA Construction Company (ASTA) discovered a 500 gallon waste oil tank (Figure 2). A small localized area of stained soil consistent with that of waste oil was observed around what appeared to be the fill pipe. ASTA Construction also noted a localized area of soil stained and smelling of what appeared to be diesel fuel. In a letter dated August 17, 1994 from ASTA to SJCEHD, it was stated that the waste oil UST was taken out of service approximately 10 years prior to 1994 (Appendix A). The tank had not been removed because it was located beneath the above ground tank farm. In August 1994, ASTA submitted a Work Plan For Waste Oil Tank Removal and Subsurface Soil Remediation dated August 17, 1994 to the RWQCB and the San Joaquin County Environmental Health Division SJCEHD. The purpose of the proposed work was to removed the waste oil UST and excavate soil impacted with oil from the UST and diesel released during the operation of the above ground tank farm. In a letter dated August 31, 1994,the RWQCB stated that"because of staff and funding shortfalls, we will be unable to provide technical oversight of your case at this time". The August 31, 1994 letter requested that copies of all letters and reports concerning the site be forwarded to the RWQCB and that the local agencies should be contacted before performing any site related work(Appendix A). In response to the presence of diesel in the surface soil,the SJCEHD wrote a letter dated September 13, 1994 that placed the site on the local contaminated database (Appendix A). 3.1 Waste Oil UST Removal and Sample Collection On September 28, 1999 ASTA removed the 500 gallon steel waste oil UST and associated piping. The UST was transported by a licensed Hazardous Waste hauler to Erickson, Inc. in Richmond, California for destruction(Appendix B). Mr. Eric Trevena with the SJCEHD was present to observe the tank removal and collection of confirmation soil samples. Following the removal of the tank a significant area of heavily stained soil was observed in the tank pit floor. AJ-ClosureRpt.RPT.wpd