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1 i <br /> 8.0 WASTE MANAGEMENT <br /> iDrill cuttings are stored on site and covered by 6 mil plastic sheeting. Proper disposal <br /> procedures will be implemented pending regulatory agency approval. The drilling iaugers were <br /> steam cleaned prior to drilling each boring. All nnseate is contaunerized in DOT approved <br /> I <br /> containers and left on site pending approval of disposal procedures <br /> 9.0 CONCLUSIONS <br /> To assess groundwater quality and to determine the groundwater gradient beneath the site, three <br /> monitoring wells were drilled to a total depth of approximately 77 feet below grade. <br /> Groundwater was encountered during drilling activities at approximately 62 feet. The <br /> groundwater gradient, as determined from the monitoring wells and groundwater elevations, is <br /> in a northerly direction at approximately 6.029 feet/feet. <br /> Analyzed soil samples collected at the soiIlgroundwater interface determined that only toluene <br /> was detected above method detection limits Toluene concentrations ranged from 0.015 to 0.023 <br /> mg/kg. To accurately determine groundwater quality beneath the site, groundwater samples <br /> were collected on May 7, June 21, and August 22, 1991 Laboratory results of Iall analyzed <br /> groundwater samples determined that petroleum hydrocarbons were only detected in monitoring <br /> wells MW1 and NM. Laboratory analyses of the August 22, 1991 samples determined that <br /> k only benzene was detected above method detection limits, 0.41 and 0 63 µg11, respectively. <br /> r <br /> From all sampling rounds, no constituents were present above Maximum Contaminant Levels <br /> established by the State Department of Health Services. <br /> I <br /> The source of impaction has been removed Based on the information provided concentrations <br /> of dissolved petroleum constituents in groundwater are below the State MCLS and do not warrant <br /> active remediation at this time. <br /> f I <br /> t <br /> � L�r.icn U.SA Eoa.-367 � I <br /> MUM <br /> I � <br />