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southwest with a gradient of approximately 4 feet per mile (0 0007) The petroleum hydrocarbon <br /> contaminated groundwater plume extends over an area of approximately 62,500 square feet at a depth ofabout <br /> 48 feet bgs A minor amount of free-product may still exist at the site beneath the former tank pits between <br /> MW-2 and MW-3 based on inspection of water surface within the wellbores during quarterly monitoring <br /> events <br /> Vertical rise and fall of the groundwater surface has spread the movement of petroleum hydrocarbon <br /> compounds vertically through the soil/groundwater contact where highest concentrations appear to be located <br /> The groundwater plume appears to have the following maximum petroleum hydrocarbon concentrations <br /> present In it benzene(290µg11), toluene(1300 µg/1 ethylbenzene (400µg/l), xylene(1800µg11),TPH-gas <br /> (11,000µg/1) Oxygenate compounds present in the groundwater include MTBE(8 3 µg11) Lead scavengers <br /> present in the groundwater plume include 1,2-DCA(10 µg/1)and 1,2-EDB(1 2 µg/l) Individual constituent <br /> concentrations appear to be highest in monitoring well PT-MW-3 <br /> It appears that chemical dispersion may be the transport mechanism for dissolved phase petroleum <br /> hydrocarbons in groundwater in this area <br />• MMO1Enwro=ent"amwTeuw\ReWns\SAR1203vpd Page 22 <br />