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' EXECUTIVE SUMMARY, Continued <br /> The ground-water direction of flow and gradient were calculated from depth-to-ground-water <br />' measurements for April 1, 1993, relative to positions and elevations of each well head The <br /> gradient and flow direction of ground water beneath the site was determined to be 0 011 to the <br /> west. <br /> Based on the information gathered during this investigation, we present the following conclusions <br /> and recommendations <br /> Conclusions <br /> I Based on the analytical results, it does not appear that soil has been impacted in the areas <br /> penetrated by the soil borings drilled during this investigation Previous sampling in March <br /> of 1987 indicated no detectable concentrations of benzene and ethylbenzene, and only minor <br />' amounts of other analytes <br /> • Laboratory analyses of ground-water samples obtained from monitoring well MW-5 on <br /> April 1, 1993, indicated trace concentrations of toluene and xylenes slightly above the <br />' method detection limits These concentrations may have been due to surface runoff from <br /> rainfall during well construction penetrating the boring Monitoring well MW-5 was <br />' resampled on April 16, 1993. No detectable gasoline range hydrocarbon concentrations <br /> were detected in the ground-water resample. <br /> Recommendations <br />' Based on the analytical data collected in this and the previous investigation (1987), we do <br /> not recommend further investigation of the soil The three monitoring wells should be <br />' sampled for two additional quarters If the three monitoring wells remain unaffected by <br /> gasoline range hydrocarbons, further investigation or remediation of the ground water would <br />' not be warranted, and site closure should be sought. <br /> 1 <br /> 1 <br />