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ata'- <br /> Fy <br /> ADDMWM TD'PRC—'TANXSITEASSE;SMENr%UMT W <br /> (Acg'J--Y Ism) <br /> 7 March 1491 <br /> Pape 2 <br /> petroleum hydrocarbons were present in the soil beneath the <br /> existing UST's and preliminarily characterize the site's geologic <br /> and possible hydrogeologic conditions. <br /> SOIL CONDITIONS <br /> As encountered in the soil boxings, the material below the existing <br /> UST basin, 15 feet below grade, was principally characterized by <br /> interlayered horizons of sandy SILTS and 'silty SANDS with <br /> -- occasional layers of relatively clean, poorly graded, medium and <br /> fine SANDS. The interlayered horizons graded increasingly towards <br /> the clean or silty, fine to medium SANDS with depth. A saturated <br /> horizon was encountered at a depth of 48k to 49 feet below grade in <br /> Silty, fine to medium SANDS. <br /> y Detectable concentrations of total purgeable petroleum hydrocarbons <br /> were found in some of the samples retrieved from beneath the UST <br /> basin, A single, high concentration of 16,000 mg/kg (ppm) was <br /> observed at approximately 35 feet below grade under the north end <br /> of the existing center tank. The remainder of the TPPH <br /> _ concentrations ranged from 0.19 to 0.8 mg/kg (Ppm) , and were <br /> observedin samples collected from depths ranging from <br /> approximately 18 to 30 vertical feet below grade on both the north <br /> and south ends of the existing UST's. Relatively low <br /> concentrations of benzene, toluene, xylenes and/or 1,2- <br /> dichloroethane were observed in all of the samples analyzed. <br /> -� Ethylene dibromide was not detected in any of the samples analyzed. <br /> For detailed information on the results of the soil borings please <br /> refer to the "Pre-Tank Replacement Site Assessment Results Report" <br /> by Aegis, 5 March 1991. <br /> PROPOS20 WORK <br /> Aegis provides the following recommendations and proposed scope of <br /> work &:E'143ed upon results generated from the soil boring activity: <br /> o Wit':lOn the regions investigated during soil boring activity <br /> the _-�Ltive material consisted mainly of sands. Furthermore, <br /> impacted soils were located at a vertical depth of 35 feet <br /> below grade, with these existing conditions, in-situ soil <br /> remediation by vapor extraction may be a viable option for <br /> —��_-- --_- remediating the known impacted <br /> W205C.LTR - - - - - <br />