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1 <br />' 6 SUMMARY OF INVESTIGATION <br />' The following summarizes the results of this investigation <br /> • Sediments underlying the site consist of clayey silt and silty clay with occasional <br />' lenses of fine- to coarse-grained sand <br /> • Geologic conditions are generally similar to that observed in adjacent properties <br />' • The majonty of residual hydrocarbons were detected in the vicinity of the former <br /> UST cavity The highest concentrations were detected approximately 25 feet bgs <br />' of the former UST cavity (boring B-1) at a concentration of 1,080 milligrams per <br /> lalogram While petroleum hydrocarbons were detected in soil samples collected <br /> from the saturated zone m soil borings B-2 and B-3, TPHG, BTEX, and MTBE <br />' were below laboratory detection limits in all soil samples collected from within <br /> the vadose zone (between 16 5 feet and 215 feet bgs) <br /> • Groundwater was encountered in bonngs B-2 and B-3 at approximately 23 and <br /> 25 feet bgs, respectively Groundwater was not encountered in boring B-1 On <br /> March 6, 1997, static groundwater was measured at 23 81 feet bgs in monitoring <br />' well MW-1, and at 23 55 feet bgs in monitoring well MW-2 Groundwater <br /> elevations are consistent with groundwater elevations measured at adjacent <br />' properties <br /> • Based on groundwater flow information obtained from nearby properties, the <br />' flow of groundwater in the vicinity is to the northeast to east <br /> • TPHG and BTEX compounds were detected in monitoring wells MW-1 and <br />' MW-2 TPHG and benzene were detected in well MW-1 at concentrations of <br /> 18,000 pg/L and 4,400 pg/L, respectively, and in well MW-2 at concentrations <br /> of 220 µg/L and 33 µg/L.,, respectively The extent of hydrocarbon impact to <br />' groundwater beneath the site has not been entirely defined <br /> 1 <br /> SA[\N\PJ2\2605\26051010 1 BS-97\cib 2 Emcon <br /> 22605 101 001 6-1 Rev 0 814/97 <br /> 1 <br />