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Tank Removal <br /> A 500-gallon fuel UST was removed from Former Tank Site #2 in <br /> August 1991 (Figure 3-2) Visual observations during removal <br /> indicated that the tank was severely corroded and contained several <br /> holes Analysis of soil and ground water samples collected from the <br /> tank excavation indicated that gasoline and gasoline components were <br /> present in site soils <br /> Site Characierization <br />' ERM drilled and sampled four soil borings and constructed monitoring <br /> wells within these borings at Former Tank Site #2 during a Phase I <br /> investigation conducted in March 1992 Well locations are presented <br /> on Figure 3-2 <br /> The results of these investigations indicated that the lateral extent of <br /> TPH and BTEX in soil was limited to the area immediately northeast of <br /> the former tank location, and that the vertical extent was primarily <br /> limited to a zone ranging from approximately <br /> 5- to 8-feet bgs The volume of soils containing TPH as gasoline in <br /> excess of the 100 mg/kg cleanup goal for TPH was estimated to be <br /> approximately 500 to 700 cubic yards <br /> The extent of TPH and BTEX in ground water at Former Tank Site #2 <br /> appeared to be limited to a localized area surrounding monitoring well <br /> MW-1A, located immediately north of the former tank location <br /> rExcavation <br /> Soil excavation activities at Former Tank Site #2 were conducted in <br /> October 1993 concurrently with the Former Tank Site #1 excavation <br /> work Excavation and confirmation sampling activities were <br /> summarized in a letter report submitted to PHS/EHD on March 2, 1994 <br /> The excavation at Former Tank Site #2 extended to a depth of <br /> approximately 8 to 9 feet with areal dimensions of 115 feet in length <br /> and 40 feet in width (including side slope dimensions) For excavation <br /> near the building, the excavation was sloped at a mirumum 11 slope to <br /> avoid undermining the building structure Ground water seepage was <br /> encountered at excavation depths below 7 feet Further soil excavation <br /> and confirmation sampling below this depth required dewatering of <br /> the excavation using a vacuum truck Soil excavation activities <br /> proceeded until mobile laboratory analytical results indicated that the <br /> cleanup goal (100 mg/kg for TPH) was attained at the excavation <br /> L 3-4 <br />