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� . <br /> ENEXCO CORPORATION <br /> 3 <br /> �i <br /> EXCAVATION•PROCEDURES <br /> +• On September 7, 1990, Warren E. Gomes Excavating began the <br /> 5 <br /> excavation of the contaminated soil. A rainp was cut into the <br /> bottom of the tank excavation and the clean soil stockpiled. A <br /> layer of gray, petroleum-stained soil was 'encountered along the <br /> i <br /> north and west walls of the excavation, at ';the depth of the former <br /> tanks base, (approximately 10 feet) . Laboratory analyses from the <br /> . , <br /> previous tank pull investigation, dated 7/24/90, indicated that the <br /> i <br /> majority of contamination was located at the base of the excavation <br /> { , along these walls. : Soil was removed from the north and west walls, <br /> until the gray staining and petroleum odor no longer were apparent'. <br /> Contaminated soil was removed from the walls and base of the <br /> excavation to a depth of approximately 31 feet. Excavation <br /> procedures were stopped when petroleum staining and odor no longer <br /> . t <br /> a <br /> were detected. FID readings from the wall's and the floor of the <br /> excavation showed no detectable contamination. Groundwater was not <br /> encountered during excavation procedures and is reported to be <br /> r <br /> `Y ace.r <br /> located between 40 and 45 feet below the suf <br /> " f <br /> t The contaminated soil (approximately 1,000 ' cubic yards) was <br /> stockpiled on plastic at the Alegre Trucking site to await <br /> remediation. Approximately 1,000 cubic yards of uncontaminated <br /> j soil was also removed during the excavation procedures. The <br /> { 1 <br /> excavation was left open and barricades were placed around the <br /> { <br /> perimeter. <br /> :I <br /> i <br /> 1 <br /> s <br />