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i, Hot spot removal of contaminated soil was the recommended soil remedial alternative for OUl and OU2. Specific removal actions were determined based on the RAOs. Contaminant l concentrations that exceed the RAOs were to be excavated and disposed off-site at appropriate .;;. .. landfills. This remedial approach was outlined in the RAP, and approved by DTSC, in a 30 August 2001 letter to Mr. Stephen Pinkerton of SDHR{DTSC, 2001). The RDIP described { project information and specific procedures to be used to implement the RAP. The RDIP was approved by the DTSC in a 12 March 2004 letter to Ms. Kitty Walker of SDHR(DTSC, 2004), which is.included in Appendix A. i j The groundwater monitoring programs at each site in OU2 are under the supervision of the SJCEHD. The groundwater monitoring and remediation programs at these areas will be completed under the oversight of the San Joaquin County Environmental Health Department I (SJCEHD) and Regional Water Quality Control Board (RWQCB) after site construction is t i completed. In a March 2004 letter, the DTSC requested that.the monitoring wells at Area 10 be sampled prior to well destruction. The Area 10 sampling results are included in Appendix A. i Soil and groundwater_remediation not associated with the RAP has been performed at two areas (Areas 15 and 16) since the RDIP was completed. The work was conducted under the supervision of the SJCEHD, and was associated with previous petroleum hydrocarbon releases from USTs. At Area 15, a UST was encountered during the RAP excavation, and the SJCEHD supervised the removal of the UST and impacted soil: At Area 16, contaminated soil was excavated to below the water table in a shored excavation. All impacted soil and groundwater were disposed of offsite. ES 3.0 Pre-Remediation and Remediation Activities The planned redevelopment required that all above and below ground improvements be demolished. Between December 2003 and March 2004 all structures at the Site were demolished. During March 2004, all of the groundwater monitoring, extraction, and injection 25971025.DGD 3 11 August 2005