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i i Kennedy/Jenks/Chilton i Organic vapors were not detected above one part per million in the head space of the soil samples collected from the excavation sidewalls or bottom. Three soil samples (T-1, T-2, and T-3) were collected from excavated ' soil after the tank was removed. Samples T-1 and T-2 were collected from native soil , approximately i to 2 feet below the tank excavation bottom, at both ends of the excavation. These samples were collected by ' hand-driving brass liners into soil located in the backhoe bucket. Fill material excavated during the collection of samples T-1 and T-2 was stockpiled adjacent to the excavation Composite sample T-3 was collected from soil stockpiled during tank uncovering and tank removal . ' Sample T-3 was collected by hand digging into the soil approximately six inches with a plastic scoop and packing the soil into a brass liner. Stockpiled soil packed in the liner was collected from several locations ' on the pile to obtain a composite sample. After a sample was collected, each end of the brass liner was covered with a Teflon sheet and a plastic end cap. All samples were labeled as to sample number, sample location, date, collector and sample depth. The labeled samples were placed in a chilled ice chest along with Chain-of-Custody forms for transport to the Canonie Environmental Laboratory in Stockton, Califor- nia. Laboratory analyses were performed on a 48-hour turnaround basis ' to expedite backfilling the excavation The approximate location of the tank excavation and stockpiled soil is shown on Figure 10. The approximate locations of the soil samples collected from the tank excavation are shown on Figure 11 Laboratory reports are included in Appendix A, Part 4. A summary of laboratory ' results is presented below. Laboratory Analyses Results ' Soil samples T-1 and T-2 were analyzed for the following constituents: Constituent Method Total Petroleum Hydrocarbons - Diesel (TPH) EPA 8015 ' Purgeable Aromatics - Benzene, Xylenes, Toluene, and Ethyl- benzene (BXTE) EPA 8020 Sample T-3 was preserved until the results of analyses for T-1 and T-2 ' were received. ' Total Petroleum Hydrocarbons and BXT&E were not detected above method detection limits in samples T-1 and T-2. Based upon the non-detect readings, sample T-3 from the stockpiled soil was not analyzed. The results of laboratory analyses were discussed with Ms. Kasey Folley of the San Joaquin Local Health District on 4 May 1990. Ms. Folley agreed that the laboratory results indicate that the tank had not leaked and that the tank excavation could be backfilled ' WPI13 3.4 882526 01