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� v 0 A S S O C I A T E S I N C Selected groundwater samples were analyzed by AEN for TPHg, BTEX, oxygenate fuel additives, and total lead ' 3.0 SUBSURFACE CONDITIONS ' Backfill material was encountered in soil boring SBI in the upper 10 feet of the soil column The soil in boring SB3 consisted of a mixture of poorly graded sand and well graded sand from the surface to 11 to 14 feet bgs Soil from the remaining soil borings consisted of poorly graded sand ' from the surface to 11 to 14 feet bgs Soil from all borings consisted of well graded sand from depths between 11 to 14 feet bgs and 21 feet bgs Soil boring logs with a detailed description of ' soil types are contained 1n Appendix A 4.0 RESULTS ' 4_1 Soil Contamination ' Soil samples collected at depths of 20 feet bgs from borings SB3, SB4, and SB5 contained no detectable concentrations of TPHg, BTEX, or oxygenate fuel additives Soil samples collected from boring SB6 at depths of five, ten, and fifteen feet bgs contained no detectable concentrations of TPHg, BTEX, or oxygenate fuel additives The soil sample collected from SB6 at a depth of twenty feet bgs contained ethyl benzene, xylenes, and TPHg at concentrations of 6 4 parts per million (ppm), 49 ppm, and 900 ppm, respectively Soil samples from borings SB3 and SB6 ' contained detectable concentrations of total lead Analytical results of soil samples are summarized in Table 1 Laboratory data sheets and chain-of-custody documentation 1s presented in Appendix B ' 4.2 Groundwater Contamination Grab groundwater samples collected from borings SB3, SB4, and SB5 contained no detectable concentrations of TPHg, BTEX, and oxygenate fuel additives The sample from boring SB6 contained ethyl benzene, xylenes, and TPHg at concentrations of 1,300 parts per billion (ppb), ' 8,700 ppb, and 92,000 ppb, respectively None of the grab groundwater samples collected contained detectable concentrations of total lead Analytical results of groundwater samples are ' summarized in Table 2 Laboratory data sheets and chain-of-custody documentation are contained in Appendix C 5.0 RECOMMENDATIONS Based on the analytical results and field observations, the soil and groundwater southeast of the location of the former USTs and fuel dispenser are impacted by TPHg, ethylbenzene, and xylenes The groundwater sample and the soil sample collected from boring SB6 at 20 feet bgs contained elevated concentrations of petroleum hydrocarbons None of the remaining soil or groundwater samples collected contained TPHg, BTEX, or oxygenate fuel additives w 1130994gx tslsum doc 4