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Site Background Information: Vanco Truck&Auto Plaza <br /> Page 6 of 6 <br /> mg/kg(CPT 1-90). <br /> Site assessment activities to date defined an area here ground water is impacted by high <br /> concentrations of petroleum hydrocarbons.The highest etroleum-hydrocarbon concentrations,up <br /> to 2,200,000µg/1 TPH-d,were detected in grab ground N iater samples adjacent to the former piping <br /> sample location P13.Petroleum hydrocarbon concentrai'ons as high as 190,000 pg/l were detected <br /> in grab ground water samples just north of dispe er D1. MTBE was detected in minor <br /> concentrations just north ofdispenser sample D7.Groun water was not impacted below 35 feet bsg. <br /> Ground water samples collected from the ground watc r monitoring wells defined the dissolved <br /> plume at the northern edge ofthe dispenser islands;monitoring well MW-I defines the eastern extent <br /> of the dissolved petroleum hydrocarbon plume. <br /> Based on AGE'S interpretation of the available data,the initial release(s)of petroleum hydrocarbons <br /> occurred from the former dispensers and associated piping prior to their removal in 2003. Once <br /> released to the subsurface, the contaminants migrated through and/or adhered to the clayey silt <br /> material to a vertical depth of approximately 30 fect bsg, at which point the contaminants <br /> encountered permeable silty sand to fine-grained mate 'al (HU1) and began to migrate laterally; <br /> lateral migration was dominantly toward the north to northeast,in the direction of ground water flow. <br /> Advanced GeoEnvironmental,Inc. <br />