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L <br /> ASSLCY %Tt: <br /> O C I ATE 5 I N C . <br /> Groundwater samples were placed on ice and delivered under chain-of-custody documentation to <br /> Argon for chemical analysis. Selected groundwater samples were analyzed by Argon for TPHg <br /> by EPA method 8015, BTEX by EPA method 8020, MTBE, 1,2-DCA, EDB, TAME, TBA, <br /> ETBE, DIPE by EPA method 8260, and total dissolved lead. <br /> 3.0 SUBSURFACE CONDITIONS <br /> Soil from the boring SBI consisted of peat from the surface to depths between 6 and 9 feet bgs <br /> and consisted of sandy clay from depths between 6 and 9 feet bgs and 11 feet bgs, the maximum <br /> depth explored in boring SB L Soil from boring SB2 consisted of sandy clay from the surface to <br /> depths between 6 and 9 feet bgs. Soil in boring SB2 consisted of poorly graded sand from depths <br /> Lbetween 6 and 9 feet bgs to l land I4 feet bgs. Soil in boring SB2 consisted of inorganic silt <br /> from depths between 1 I and 14 feet bgs and 16 feet bgs, the maximum depth explored in boring <br /> SB2. Soil from boring SB3 consisted of inorganic clay from the surface to 16 feet bgs, the <br /> L maximum depth explored in boring SB3. Soil boring logs with a detailed description of soil <br /> types are contained in Appendix A. <br /> L4.0 RESULTS <br /> L4.11 Soil Analytical Results <br /> The soil samples collected from borings SB1, SB2, and SB3 contained no detectable <br /> t concentrations of TPHg, BTEX, MTBE, 1,2-DCA, EDB, TAME, TBA, ETBE, or DIPS. Soil <br /> samples collected from borings SB2 and SB3 contained low concentrations of lead that are <br /> consistent with background concentrations of lead found naturally in the soil in the San Joaquin <br /> Valley. Analytical results of soil samples are summarized in Table 1. Laboratory data sheets. <br /> and chain-of-custody documentation are presented in Appendix B. <br /> L4_2 Groundwater Analytical Results <br /> The groundwater samples collected from borings SBI, SB2, and SB3 contained no detectable <br /> concentrations of TPHg, BTEX, MTBE, 1,2-DCA, EDB, TAME, TBA, ETBE, DIPE, or total <br /> dissolved lead. Analytical results of groundwater samples are summarized in Table 2. <br /> Laboratory data sheets and chain-of-custody documentation are contained in Appendix B. <br /> 5.0 RECOMMENDATIONS <br /> LBased on the analytical results and field observations, the soil and groundwater in the vicinity of <br /> the former USTs does not appear to be impacted by petroleum hydrocarbons. ATC recommends <br /> no further action with regards to the former USTs and that the site be granted closure. <br /> if <br /> L� <br /> wA92054100201sum.doc 3 <br /> 4 <br />