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gwu NEThe tank and associated piping were removed between May 17, 1989 and May 30, 1989. A total of 16 soil samples were collected by WESTON during this tank/pipeline removal effort. Three tank bottom soil samples and 13 pipeline soil samples were collected. These samples were analyzed by ROY F. WESTON's Analytical Laboratory in Stockton, California and the results are summarized in Table 1. Each of the 16 soil samples collected were containerized with two, 4" diameter brass tubes. The tank bottom soil samples were collected from native soils within a backhoe scoop and transfered to the brass tubes. All pipeline samples were collected from inplace native soils by driving the tube into them. The initial sample tube was designated with an "A" following the sample identification while the second tube was designated with a "B." All "A" tubes were analyzed for BTX&E and all "B" tubes were - analyzed for TPH. For the purpose of simplicity, Table 1 lists the samples as "A(B) . " For example, MT-A(B) indicates the sample from location MT, "A" and "B" tube analyses. Within the narrative of this report, the samples will be identified either MT-A or MT--B as listed in the Data Report in Appendix B. Analysis for the TPH in these soil samples indicated only trace concentrations were present in two samples. For one tank bottom sample, MT-B, 17 mg/Kg of TPH was detected. This value was reported as a "J" value which indicates it was detected below the laboratory detection limit of 20 mg/Kg. For pipeline sample P12-B, 24 mg/Kg of TPH was detected. For the BTX&E compounds, eight pipeline soil samples exhibited detectable levels of toluene. The concentrations detected. ranged µ from 0.036 mg/Kg to 0.32 mg/Kg. This data was summarized in the July 12, 1989 letter (Appendix B) from Precision Industries to the San Joaquin Local Health Depart- ment. In the letter, Laura scudders requested approval to backfill the excavation. Approval has not yet been received and the excavation has not been backfilled. 3 2.3 Tank T1 Tank T1 was a 1,000 gallon gasoline tank located near the south east corner of the Laura Scudders Tracy Facility. This tank was removed on May 22, 1989. At the time of removal, two soil samples were collected by WESTON from beneath the tank and - analyzed for TPH, BTX&E and total lead. The samples were collected from a backhoe scoop of native soils beneath the tank removal area. Upon retrieval by the backhoe, 1' of upper soils was removed and a brass tube was driven into the exposed soils. This tube was sealed and transported directly to the laboratory. - - - - -- --- Tire—analytical results—for -these--samples--indicated.-quartlfiable —-- - total lead concentration in both samples. The concentrations detected were 61.3 mg/Kg and 54.2 mg/Kg for the east and west - 7 - tit