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11 A San Joaquin County PHS-EHD representative provided oversight for soil sampling during tank removal. Sampling conformed with the State of California Leaking Underground Fuel Tank (LUFT) Manual guidelines for sampling associated with USTs removal (SWRCB 1989). All soil samples were collected under the direction of a registered geologist, in accordance with the USACE specification and were submitted to Severn Trent Laboratories (STL), a state and USACE certified laboratory, for analysis. Specifically, the sampling procedures were as follows: • All sampling equipment was thoroughly cleaned prior to each use. • Soil samples were collected from under the concrete slab with carbon steel split spoon sampling devices and stainless steel sampling sleeves. • A minimum of 6 inches of soil was removed from the exposed surface prior to driving a sample sleeve to collect the soil sample. • Immediately after the sample was collected, each end of the stainless steel sample sleeve was wrapped with a Teflon sheet and capped. The sample sleeve was labeled in accordance with procedures outlined in the approved work plan. Care was taken to assure that no headspace was present in the sample sleeve. • After labeling, the soil samples were placed in an airtight bag and immediately placed into a refrigerated ice chest. Samples were delivered, along with a completed chain - of -custody, to the laboratory. • Chain -of -custody documentation was maintained for the sampling event. Copies are provided in the complete laboratory report in Appendix B. On 11 June 2001, a total of two confirmation soil samples were collected from beneath the piping locations at the tank site. Two soil samples (PL -1 and PL -2) were collected at a depth of 2 feet below ground surface (bgs), the remaining six soil samples (SP -1 (W), SP -2 (E), SP -3 (W), SP -4 (S), SP -5 (E) and SP -6 (W)) were collected as four -point composites from the 9