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31 August 1995 AGE-NC Project No. 95-0151 Page 2 of 4 3.0. SITE ASSESSMENT AND REMEDIATION 3.1. EXCAVATION OF FORMER UST AREA A work plan for excavation of the former UST was prepared by Geological Audit Services, Inc. (GAS) and submitted to the San Joaquin County Public Health Services - Environmental Health Division(PHS-EHD). The work plan was approved in a letter from the PHS-EHD dated I 1 March 1992. However, excavation procedures did not commence until 1994. On 11 August 1994, approximately 300 cubic yards of soil were excavated from the former UST area. The soil was excavated by representatives of Bob Evans Trucking(BET). The soil excavation was monitored and supervised by representatives of GAS. Excavated soil was field screened for organic vapors using a photo-ionization detector (PID). Based uponfield screening, the soil was placed into"clean' and"impacted" stockpiles. Approximately 125 cubic yards of impacted soil was stockpiled on plastic sheeting along the eastern portion of the property. Approximately 175 cubic yards of"clean" soil was stockpiled adjacent to the excavation. 3.2. COLLECTION OF SOIL SAMPLES Seven soil samples were collected from the floor and sidewalls of the excavation. Each sample was collected from the excavator bucket using a metric soil sampler loaded with two pre-cleaned 2- by 3-inch brass sleeves. The ends of the lead sleeve were covered with aluminum sheets, capped and sealed with tape. The samples were then transported under chain-of-custody procedure to Sparger Technology, Inc. (STI) in Sacramento, California. Each sample was analyzed for TPH-g and BTE&X in accordance with EPA methods 8015m and 8020, respectively. No TPH-g or BTE&X were detected in soil samples collected from the sidewalls or floor of the excavation. Analytical results of soil samples are included in Table 1. The laboratory report and chain-of-custody are included in Appendix B. 3.3. STOCKPILE SOIL SAMPLE COLLECTION On 11 August 1994, two soil samples were collected from the "clean" stockpiles. Each sample was collected following the protocol detailed in Section 3.2. The samples were then transported to SPI and analyzed for TPH-g and BTE&X in accordance with the appropriate methods. No petroleum hydrocarbons were detected in samples from the"clean' stockpiles. On 2 September 1994, representatives of GAS collected eight samples from the impacted stockpile. �" The samples were transported under chain-of-custody to McCampbell Analytical, Inc. (MAI) and