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Site Background Information Vanco Truck & Auto Plaza <br /> Page 6 of 6 <br /> sample location P13 Petroleum hydrocarbon concentrations as high as 190,000 µg11 were detected <br /> in grab ground water samples dust north of dispenser D1 MTBE was detected in minor <br /> concentrations just north of dispenser sample D7 Groundwater was not impacted below 35 feet bsg <br /> Ground water samples collected from the ground water monitoring wells defined the dissolved <br /> plume at the northern edge of the dispenser islands, monitoring well MW-1 defines the eastern <br /> extent 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 feet bsg, at which point the contaminants <br /> encountered permeable silty sand to fine-grained material (HUI) and began to migrate laterally, <br /> lateral migration was dominantly toward the north to northeast, in the direction of ground water <br /> now <br /> • <br /> Advanced GeoEnvironmental,Inc <br />