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II <br /> a <br /> Project No S8080-06-02 <br /> May 5, 1995 <br />' 60 CONCLUSIONS <br /> WN uN 171ii!ml 3 u <br /> Based on Geocon's review of the soil and groundwater data acquired through November 1994, <br />' summarized below are conclusions regarding the environmental investigations performed at the'site <br /> ' Petroleum hydrocarbons reported as gasoline and reported as "unidentified petroleum <br /> hydrocarbons in the gasoline and diesel fuel range" exist in soil beneath the northern, central <br /> and southern portions of the site and extend beyond the northern and eastern site <br /> boundaries <br /> The residual petroleum hydrocarbons in soil beneath the site do not appear to have impacted <br /> groundwater based on maximum depths of vertical migration ranging from approximately <br /> 25 to 43 feet bgs <br /> Based on the configuration and size of the petroleum hydrocarbon plume, it appears that <br /> ' petroleum hydrocarbon releases to the environment occurred from two separate former UST <br /> locations within the site Soil analytical data suggests that separate petroleum hydrocarbon <br /> ' releases occurred within the northeast and southern portions of the site and appear to have <br /> resulted in overlapping plumes <br /> The vertical and lateral limits of petroleum hydrocarbons in the vadose zone have been <br /> ' adequately delineated to allow for the implementation of a soil remedial action plan <br /> Based on the distribution of MTBE concentrations in groundwater, the MTBE source <br /> ' appears to be in an upgradient direction from the site <br /> • Based on the distribution of "weathered" TPHg concentrations in groundwater and the <br /> absence of detectable TPHg in onsite downgradient monitoring well MW-2, the TPHg <br /> -30- <br /> Iii _ <br />