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a <br /> IWE <br /> BM RNME <br /> Chevron/Stockton 7 <br /> November 1989 <br /> Figure 3 shows the anticipated limits of the required <br /> excavation based on the analyses of the soil samples taken in <br /> September of 1587. The actual extent of the excavation will be <br /> � s determined by field conditions. If all areas are excavated to a <br /> depth of 18-feet below grade, approximately 1,150 cubic yards of <br /> r=a <br /> soil will have been removed. <br /> f � <br /> STOCKPILING <br /> Excavated soils will be transported on site using a front- <br /> end loader to the soil stockpiles. Stockpiles will be located in <br /> the northwestern corner of the site. Stockpiles will be con- <br /> -a structed by placing the excavated soils on sheets of polyethylene <br /> plastic. once the piles are completed, each pile will be Covered <br /> with plastic tarps, and the tarps secured to minimize the release <br /> of volatile hydrocarbons to the atmosphere. Groundwater <br /> 17 Technology, Inc. plans to separate the soils from the three <br /> excavated areas since the nature of the contamination from each <br /> area may vary. By separating the soils, GTI can manage the <br /> N• treatment and/or disposal of each stockpile more efficiently. <br /> Scils containing volatile hydrocarbons will be allowed to <br /> aerate if permission can be obtained by the r� sisite regulatory <br /> agencies. once hydrocarbon levels have fallen below 1 ppm, as <br /> confirmed by laboratory analyses of one soil sample per 50 cubic <br /> ! ' yards of excavated soil, the soil will be used to backfill the <br /> excavations. Soils containing non-volatile hydrocarbons will be <br /> treated on site and/or disposed of in an appropriate manner. <br /> r.. <br /> - Ly; <br /> GRI 1IND LATER <br />