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Subsurface Investigative Results <br /> The site is underlain at shallow depths by beds of silt and fine-grained sand that vary in thickness <br /> and extent(Figure 7). The uppermost unit is a silt bed whose color and thickness are variable. $ <br /> This bed is missing in the former UST pit where it was likely removed during the over <br /> excavation. . East of the excavation,the silt bed overlies a relatively thin sand bed that is fine <br /> grained to silty.Below the sand is a thick layer of relatively consolidated silt that contains leaf <br /> impressions;root holes, and other evidence of ongoing soil profile formation. Below the silt bed <br /> is another sand bed that coarsens downward but its base was not reached during the subsurface <br /> investigation. The lithologic contact between the silt bed and this lower sand bed varies from a <br /> depth of 24 feet bgs in soil boring B 1 to approximately 28 feet bgs in soil borings B2 and B5. <br /> This lithologic contact was reportedly not encountered in soil boring B4. <br /> Strong to moderate petroleum hydrocarbon odors were detected in the upper silt bed in soil { <br /> boring Bl. A slight odor was noted in the uppermost sand sample(25 feet bgs)from this same <br /> boring.No evidence of petroleum hydrocarbon contamination was noted in any of the other soil <br /> samples or in the auger cuttings. <br /> Soil boring B3 was located within a few feet of the first locomotive fueling track, in a slight <br /> depression between the first locomotive fueling track and the location of the former UST pit. I <br /> i <br /> This boring reported encountered water at a depth of less than 2 feet bgs that had a substantial <br /> petroleum hydrocarbon sheen observed on the water. Drilling operations were suspended ' <br /> because of concern that a subsurface water line had been breached. Personnel from ST&E <br /> inspected the location and informed Upgradient and V&W that railroad locomotives were <br /> washed and flushed on the engine tracks adjacent to this boring, and that the wash water collects <br /> in this depression in the boring. Upgradient directed V&W to move 10 feet to the west of soil i <br /> boring B3 and drill a new boring(B4). After 134 was drilled, a water sample was collected from <br /> B3, although most of the water had drained from the borehole while B4 was being drilled. <br /> p <br /> M&WD%ovironmenlaMSTEM orkplaolWorkplen]1142007—pd 8 <br />