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' INTERNATIONAL TECHNOLOGY CORPORATION <br /> 5.0 CONCLUSIONS AND RECOMMENDA TIONS <br />' The site's subsurface consists of a lean clay with sand to a depth of 17 feet below grade <br /> Underlaying the lean clay is a well-graded sand <br /> Groundwater occurs at approximately 45 feet below grade and flows to the northeast with a <br /> gradient of 0 011 ft/ft <br /> Only two soil samples collected, one from MW-3 at 20 feet and one from MW-1 from 40 <br />' feet, contained BTEX constituents Also, the sample from MW-3 collected at a depth of 20 <br /> feet contained 7 4 ppm TPH as gasoline The finding of gasoline instead of diesel at a <br /> relatively shallow depth (20 feet), upgradient from the diesel UST's shown in Figure 2 <br />' suggest a different offsite source of these hydrocarbons <br />' The finding of a small amount of diesel in groundwater samples from MW-2 and MW-1 <br /> (both downgradient from the diesel UST's) indicate that groundwater has been impacted <br /> offsite and that further investigation may be warranted <br /> I <br /> ll <br />