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isopropyl Ether, Ethyl tert-Butyl Ether, Methyl-tert-Butyl Ether, tert-Amyl Methyl Ether and tert- Butanh using EPA method 8260 modified and for Ethylene Dibromide (1,2-Dibromoethane) and 1,2-Dichloroethane (1,2-DCA) using EPA method 8260 On February 23, 2000, the product dispensing piping was exposed and it was determined that this piping would be removed The piping (double walled fiberglass) was removed and samples were obtained, under the observation of Mr Michael Kith SJC-EHD One area of release was discovered beneath part of the piping and that area was later over-excavated, see Pit 3 on Figure 9 During the removal of the double walled fiberglass product dispensing piping old abandoned steel product dispensing piping, possibly with vapor return piping was discovered. This piping was inspected, removed and representative soil samples were obtained, under the observation of Ms. Letitia Briggs SJC-EHD. Sample results indicated that gasoline range hydrocarbons impacted two areas, see Pit 1 and Pit 2 on Figure 9 These areas were later over-excavated Over-excavation of all three gasoline tainted areas were observed by Mr. Michael Infnrna SJC-PHS Approximately 70 cubic yards of gasoline tainted soils were over-excavated from the three pits This soil was removed for disposal to Forward Landfill during March 2000. During station upgrade, an additional 600 cubic yards of soil was excavated Soni samples were obtained from the excavated soil piles under the direction of Mr Michael Infurna These samples were analyzed using EPA Method 8260 B and were all below LLDL, see April 6, 2001 report "Sample Results of Excavated Soil Piles", Appendix F RECOMMENDATIONS Wickland has addressed all the concerns stated in the RWQCB Nonconcurrance letter dated July 18, 2000 Degradation of TPHg and BTEX has been complete at a distance 345 feet downgradnent of the site (SB8) No further action is necessary and all wells associated with this site should be destroyed IIEWTATIONS The information presented in this report is based on the following 1 The observations and data collected by field personnel 2 The result of laboratory analyzes performed by a state certified analytical laboratory 3 Our understanding of the regulations of San Joaquin County, the City of Stockton and the State of California 4 References reviewed for this report Changes in groundwater conditions can occur due to variations in rainfall, temperature, local and regional water use and local construction practices In addition, variations in the soil and groundwater conditions could exist beyond the points explored in this investigation State Certified Laboratory analytical results are included in this report. This laboratory follows EPA and State of California approved procedures, however, WEGE is not responsible for errors in these laboratory results s 7 R-603 May 2001