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a' <br /> Chevron/South Center <br /> November 19s9 a <br /> Figure 3 shows the expected excavation area if no signs of <br /> contamination are encountered. If hydrocarbon contamination is <br /> encountered, the final configuration of the excavation will be <br /> based on field observations. <br /> Once the exca'v'ation is completed, the resultant pit will be <br /> backfilled with aerated materials and/or clean fill. The <br /> - excavation will then be resurfaced to allow for continued <br /> - operation at the site while the assessment of the subsurface <br /> continues with the soil boring program. <br /> STOCKPILING <br /> If hydrocarbon-impacted soils are discovered, excavated <br /> soils will be transported on site using a front-end loader to the <br /> soil stockpiles. Stockpiles will be located in the western <br /> - corner of the site. Stockpiles will be constructed by placing <br /> the excavated soils on sheets of polyethylene plastic. once the <br /> piles are completed, each pile will be covered -by plastic tarps, <br /> if required, and the tarps secured to minimAze the release Gf <br /> volatile hydrocarbons to the atmosphere. <br /> Any soils found to contain non-volatile hydrocarbons will be <br /> stockpiled separately. These soils will be treated on site <br /> and/or disposed of in an appropriate manner. <br /> Soils containing volatile hydrocarbons will be allowed to <br /> aerate if permission can be obtained from the requisite <br /> regulatory agencies. once hydrocarbon levels have fallen below <br /> 1 part per million (ppm) total petroleum hydrocarbons (TPH)-as <br /> �l GROUNDW"tTER <br /> TECHNOLOGY,INC. <br />