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® I7 CORPORATION <br />4.0 CONCLUSIONS <br />i <br />Hydrocarbons were detected by the GX-3A meter in soil samples collected <br />in the upper 20 feet in wells DH -1, MW -1 and MW -2. in wells MW -6 and <br />MW -7, hydrocarbons were detected at a depth of 30 feet and extending to <br />the water table. <br />h <br />Free product is not present at the water table in any of the ground <br />water monitoring wells. Chemical analyses conducted at Multi -Tech <br />ry� <br />Laboratories detected petroleum hydrocarbons in wells MW -5, MW -6, and <br />MW -7. <br />The ground water gradient underlying the site is essentially flat, <br />having a maximum piezometric elevation. difference of 0.14 feet over a <br />distance of approximately 60 feet. A slight gradient appears to exist; <br />however, an accurate flaw direction could not be determined with one set <br />set of measurements. <br />~_ Based on the distribution of hydrocarbons in the soils and ground water, <br />the sources of hydrocarbons appear to be in the area of the tanks. <br />Apparently, the hydrocarbons are migrating downward with a minimal <br />amount of lateral spreading until the water table is encountered where <br />the plume begins to spread laterally. <br />Soil contamination at both the 35 and 40 foot depth indicates that the <br />water table fluctuates over this interval. The apparent lack of spread <br />of hydrocarbons in the soils indicates that the soils offer little <br />resistance to the downward migration of the hydrocarbons. <br />a ENG:0090 <br />7 <br />