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6. Phase H Environmental Site Assessment Re-excavation and soil sampling of the former UST location in the south- western area of the subject property was performed. In accordance with the BBL work plan dated August 4, 1995 a confirmatory soil assessment was performed for the subject facility. The work plan was approved by the San Joaquin Public Health Services,Environmental Health Division(PHS/EHD) in a letter dated September 6, 1995. A copy of the work plan and the approval letter are included in Appendix D. All field work for the Phase II portion of the `-' investigation was performed in accordance with a site specific Health& Safety Plan prepared by BBL for this project. +�— 6.9 Re-Excavation of On September 27, 1995, the location of the former UST was re-excavated to Former UST obtain confirmatory soil samples. Soil was excavated using a backhoe mounted location and Soil on a BOBCAT machine. The location of the former UST was determined using Sampling Rationale the coordinates recorded in field notes by the PHS/EHD inspector during the UST removal. During the re-excavation soils were continuously screened using an Hnu Photo Ionization Detector(PID)to determine the presence, if any, of 1m petroleum associated hydrocarbons. Excavated soils were temporarily stockpiled on plastic sheeting during the re-excavation. No hydrocarbons were detected by the PID. BBL collected a total of eight soil samples. Two samples were collected from the previous sample locations pursuant to the work plan and six additional soil samples were collected from the sides and bottom of the former UST location at the request of the PHS/EHD inspector. Figure 3 depicts the soil sampling locations. Following the collection of soil samples the excavation was backfilled using the excavated soils. 6.2 Soil Sampling Soil samples were collected with an AMS split core sampler. This method Methodology allows for the collection of undisturbed soil samples. Each soil sample was collected directly into a 2-inch diameter, 6-inch long brass liner contained within the split core sampler. The ends of the liner were covered with Teflon tape and then sealed with plastic cylinder caps. Samples were stored in a cooler with blue ice and then delivered by BBL personnel to Curtis&Tompkins, Ltd. laboratory(C&T)that day. 6.3 Analytical Results Soil samples collected during the re-excvation were analyzed for benzene, toluene, (BTEX)total xylenes and ethyl benzene by EPA Method 8020 Laboratory analysis of the soil sample via EPA Method 8020 did not detect hydrocarbons in any of the eight soil samples. Appendix E contains the ' laboratory analytical reports and chain-of custody form. V BLASLAND,BOUCK&LEE,INC. NEWrlrJ.WPD--5/7196 engineers & scientists 6-1