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EN � a Ms. Evelyn Hubel February 25, 1999 Page 5 i f Benzene was detected at concentrations ranging between 0.022 pp 9 9 ppm and 0.075 min soil samples collected from borings SB-11 and SB-12 located adjacent to hydraulic auto body lifts in the service bay building. Benzene was also detected at concentrations of 0.217 and 0.486 ppm in soil samples collected from boring SB-17 located near the former gasoline USTs. These benzene concentrations are below the U.S. EPA PRG of 0.63 ppm for soil in residential areas. Toluene, ethylbenzene, and xylenes were detected at concentrations ranging between 0.008 ppm and 0.901 ppm in soil samples collected near 2 floor drains (SB-5 and SB-6), 5 hydraulic } auto body lifts and the former gasoline USTs. The concentrations of these compounds are below the U.S. EPA PRG values for soil in residential areas. t Of the LUFT 5 metals, total chromium, lead, nickel, and zinc were detected in soil samples collected onsite: The concentrations of total metals detected in soil samples collected from the 18 borings do not exceed the US. EPA PBGs for soil in residential areas. Analytical results of groundwater samples collected from monitoring wells MW-1, MW-3, and MW-4 indicate that TEPH as gasoline was detected in MW-4 at 97 parts per billion (ppb). Presently, there are no published cleanup criteria for gasoline in groundwater. Benzene was detected at 1.1' ppb in the groundwater sample collected from monitoring well MW-4. This concentration is above the California MCL of 1.0 ppb for benzene in drinking water; however, the 1.1 ppb value is within historical values of benzene measured in groundwater samples collected from monitoring well MW-4. Ethylbenzene and total xylenes were also detected at 2.2 } ppm and 16 ppm, respectively, in the groundwater sample collected from monitoring well MW-4- These concentrations are below the California MCLs for ethylbenzene and total xylenes and are within historical values for groundwater samples collected .from monitoring well MW-4. Table 2 in Attachment 2 summarizes the results of the laboratory analyses performed on groundwater samples. A copy of the laboratory report is provided in Attachment 3. Total lead was detected at 0.0097 ppm in the groundwater sample collected from monitoring # well MW-1. This concentration is below the U.S. EPA MCL of 0.015 ppm for total lead in drinking water. Total chromium was detected in two groundwater samples at concentrations up to 0.025 ppm, which is below the California MCL of 0.05 ppm for chromium in drinking water. Conclusions i, Analytical results of soil samples collected from the borings advanced adjacent to the floor drains at the subject property indicate that TRPH was detected in one of the borings (SB-2) at 1,409 ppm. However confirmatory analysis of this soil sample using EPA Method 8015M indicates that TPH as gasoline, diesel, and motor oil were not detected in soil at concentrations i