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San Joaquin Motor Pool Facility May 11, 1999 Site Assessment Report Groundwater samples were analyzed for TPH-G, TPH-D, BTEX, and the oxygenated compounds MTBE, tertiary-butyl alcohol (TBA), di-isopropyl ether (DIPE),ethyl-tertiary-butyl ether(ETBE), and tertiary-amyl-methyl ether(TAME) in accordance with EPA Method No M8015 and EPA Method No 8260, respectively Soil and groundwater sample laboratory analytical results are presented in Tables 2 and 3, respectively Concentrations of TPH-D, TPH-G, BTEX, and MTBE in groundwater are shown in Figure 5 Laboratory analytical reports are presented in Appendix F 13.0 SUMMARY OF FINDINGS Based upon the data presented in this report, previous investigations, current regulatory guidelines, and the professional judgment of TEM,the following summary of findings is being presented a Two (2) confirmation soil borings (HA-1 and HA-2) were each advanced by hand auger to a ' depth of approximately 15 feet bgs in Area I A total of six (6) soil samples were collected, a Two (2) of the six (6) samples collected from the hand auger borings in Area I reported ' concentrations of TPH-D above the laboratory reporting limit The samples collected at 5 and 10 feet bgs from boring HA-1 reported TPH-D concentrations of 4,500 milligrams per kilogram (mg/kg) and 82 mg/kg,respectively No concentrations were detected from ' samples collected below 10 feet bgs, a Four(4) soil bonngs (B-1, B-2, B-3, and SB-3) were advanced at the SITE with a drill rig Soil borings B-1 (continuously cored) and B-2 were each advanced to a depth of 1 approximately 60 feet bgs Soil boring B-3 and SB-3 (slant-boring) were each advanced to depths of approximately 20 and 15 feet bgs, respectively, a Soil boring B1 was converted into one (1) 4-inch diameter groundwater/vapor well MW-1 Soil boring B2 was converted into one (1) 4-mch diameter groundwater monitoring well MW-2, a During drilling activities, soil samples were collected at approximate 5-foot intervals in each boring for a total of 30 samples which were submitted for laboratory analyses, a Sixteen(16) of the thirty soil samples were reported to contain concentrations of TPH-G 1 above laboratory detection limits Soil sample BI-38 was reported to contain the highest TPH-G concentration at 3,500 mg/kg, ra Twenty of the thirty soil samples were analyzed for TPH-D Only one (1) sample (132-40) was reported to contain TPH-D (51 mg/kg) at concentrations exceeding the laboratory ' detection limits, 1 8