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I <br /> i <br /> Project No 58080-06-02 <br />' May 5, 1995 <br /> average petroleum hydrocarbon concentration in soil of 1,600 mg/kg, it is estimated that <br /> approximately 9,000 pounds of petroleum hydrocarbons remain in soil beneath the site <br /> 42 Petroleum Hydrocarbons, MTBE and VOC's in Groundwater <br /> Petroleum hydrocarbons reported as gasoline and also reported as "unidentified hydrocarbons within <br /> 1 the diesel fuel range", and "weathered gasoline" in addition to MTBE and VOC's were detected in <br /> several of the onsite and offsite groundwater monitoring wells <br /> Petroleum hydrocarbons reported as "unidentified hydrocarbons within the diesel fuel range„ were <br />' detected in wells MW-1, MW-3, MW-4 and MW-5 at concentrations ranging from 52 to 190 ug/L <br /> The distribution of these diesel fuel range hydrocarbons in groundwater beneath and beyond the site <br /> extend beyond upgradient well MW-5 and both cross gradient wells MW-1 and MW-4 <br /> MTBE was detected in wells MW-1, MW-3 and MW-5 at concentrations ranging from 76 to 610 <br /> ug/L The highest concentration of MTBE was detected in upgradlent well MW-5 at a concentration <br /> of 610 ug/L The distribution of MTBE extends beyond upgradient well MW-5 and cross gradient <br />' well MW-1 <br /> One or more VOC's were detected in each of the groundwater monitoring wells with the compound <br /> specific concentrations ranging from the Iow parts-per-billion to a maximum concentration of 41 <br /> , <br /> 1 ug/Llfor DCA in well MW-5 <br /> 43 Sources of Soil Impacts <br />' The extent of the lateral migration of petroleum hydrocarbons in soil beneath the site, the <br /> differences in the depth of vertical migration between the northern and southern portions of the site <br /> and the documented site history suggest that two separate generations of UST systems,released <br /> -22- <br /> 1 <br />