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EllOt <br /> Ms. Evelyn Hubel <br /> 1 February 25, 1999 <br /> Page 6 <br /> i <br /> above laboratory reporting limits. The TRPH level in the soil sample collected from boring SB-2 ! <br /> may have resulted from organic carbon (i.e., non-petroleum hydrocarbon material) such as <br /> decaying plant material. Chlorinated VOCs were not detected in soil samples collected <br /> adjacent to the floor drains. Ethylbenzene and total xylenes were detected in soil samples <br /> collected adjacent to 2 of the 9 floor drains however th <br /> J e concentrations did not exceed U.S. <br /> EPA PRGs for soil in residential areas. Total chromium, lead, nickel, and zinc were detected in <br /> f soil samples collected adjacent to each of the 9 floor drains, however the concentrations did not 1 <br /> exceed U.S. EPA PRGs for soil in residential areas. } <br /> i <br /> Analytical results of soil samples from the borings advanced adjacent to the 5 hydraulic lifts I <br /> indicate that petroleum hydrocarbons were detected in soil samples from only one boring,Y 9� <br /> 14. The petroleum hydrocarbons were characterized as predominantly motor oil-type <br /> hydrocarbons, which likely originated from hydraulic oil released from the auto body lift. The <br /> presence of these compounds in the soil sample collected at 10 feet bgs and not in the soil <br /> sample collected at 5 feet bgs suggests that the base of the hydraulic auto body lift extends <br /> below 5 feet bgs. Groundwater occurs at approximately 11 feet bgs at the site and was not <br /> sampled in the vicinity of the hydraulic lift during this investigation. Chlorinated VOCs and PCBs <br /> were not detected in soil samples collected near the hydraulic auto lifts. BTEX compounds <br /> were detected in soil samples collected adjacent to the hydraulic lifts, but the concentrations did <br /> not exceed U.S. EPA PRGs for soil in residential areas. <br /> .t <br /> Analytical results of soil samples collected from borings advanced adjacent to the former ASTs, <br /> former drum storage area, and former UST locations indicate that petroleum hydrocarbons and <br /> chlorinated VOCs were not detected above laboratory reporting limits. BTEX compounds and <br /> total chromium, lead, nickel, and zinc were detected in some soil samples, but the <br /> concentrations did not exceed U.S. EPA PRGs for soil in residential areas. <br /> TPH as gasoline and benzene were detected at 1.1 ppb and 97 ppb, respectively, in the ' <br /> groundwater sample collected from monitoring well MW-4. The benzene concentration is <br /> above the Califomia EPA MCL of 1.0 ppb, however it is within historical values of benzene <br /> measured in groundwater samples collected from monitoring well MW-4. A regulatory cleanup <br /> objective has not been established for gasoline in groundwater. Ethylbenzene and total xylenes <br /> were detected in the groundwater sample collected from monitoring well MW-4, however the <br /> concentrations were below California MCLS for drinking water. Total chromium and lead were <br /> detected in groundwater samples collected from monitoring well MW-1 and total chromium was <br /> detected in the groundwater sample collected from monitoring well MW-4. When analyzed to <br /> assess whether dissolved forms of these metals were present in filtered groundwater samples, i <br /> chromium and lead were not detected above laboratory reporting limits. <br />