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• 6.0 CONCLUSIONS <br /> A number of conclusions can be developed based on the findings described in this report Soil <br /> analytical data collected from investigations to date indicate that petroleum hydrocarbon impacts to <br />' the groundwater zone have been minimal The characterization of soil and groundwater conditions <br /> at the Site appears to be completed An evaluation of groundwater chemical data in consideration <br />' of the observed water level and subsurface geologic data indicates that irutial groundwater impacts <br /> from the petroleum hydrocarbons released at the Site were limited to the sandy zone between 60 and <br />' 80 feet bgs Conservative benzene transport time estimates of flow within this sandy zone indicate <br /> a migration rate of less than 25 feet per year - <br />' Although not specifically addressed in this Report, the possibility that a slug of surfactant (Simple <br /> Careen) may have resulted in the movement of petroleum hydrocarbons beyond the range of existing <br />' groundwater monitoring wells does not appear to be realistic, in consideration of the observed low <br /> transport rate and the variable flow directions documented at the Site The remaining conclusion is <br /> that active aerobic degradation of the impacts to the sandy zone has occurred resulting in the <br /> documented reduction and continued absence of petroleum hydrocarbons in Site groundwater <br /> I <br /> SEACPRm <br /> N0026 001 DI ROF 13 August 11994 <br />