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41 <br /> 1 1 <br /> . 4 0 CONCLUSIONS AND RECOMMENDATIONS <br /> The results of this investigation suggest that the impacts to soil <br /> 9 99 p and groundwater beneath the site <br />' are concentrated beneath the former USTs, and attenuate to the north and south of the former <br /> fuel farm The nature of the petroleum hydrocarbons in soil and groundwater appears to consist <br /> mostly of gasoline and BTEX compounds Concentrations of jet fuel hydrocarbons are generally <br />' lower Concentrations of oxygenate compounds are absent in soil and relatively low in <br /> groundwater MTBE was not detected in soil or groundwater <br />' In soil, the highest concentrations of petroleum hydrocarbons were observed between 45 and 55 <br /> feet within the capillary fringe and zone of groundwater fluctuation The soil samples collected <br /> within this interval were probably in contact with the impacted groundwater beneath the site <br /> Laterally, the extent of impacted soil appears to be limited to the vicinity of the former fuel farm <br />' Given that the soil samples collected at 65 feet from all three soil borings were free of petroleum <br /> hydrocarbon compounds, the vertical extent of impacted soil also appears to be defined <br />' In groundwater, petroleum hydrocarbons appear to be concentrated on the west side of the former <br /> fuel farm To the north and south of the former fuel farm, lower concentrations of petroleum <br /> hydrocarbons in groundwater suggest that the impact attenuates by natural processes The <br /> lateral extent of impacted groundwater is not defined '` ==l��`"" f d` ' <br />' Based on these conclusions, Ramage Environmental recommends that the three monitoring wells <br /> be monitored and sampled on a quarterly basis to confirm petroleum hydrocarbon concentrations <br /> and groundwater flow and gradient characteristics The first quarterly groundwater monitoring <br /> event is scheduled for February 2003 <br /> 12 <br />