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VOW low <br /> gasoline odors. If evidence of residual contamination is observed, SEMCO will be directed <br /> to deepen or extend the excavation as necessary to remove it. However, due to shallow <br /> groundwater and proximity to the convenience store, both the vertical and lateral extent of <br /> excavation are expected to be limited. Because of these limitations, we estimate that the <br /> total volume of soil that must be disposed of will be less than 300 cubic yards. <br /> We anticipate reaching groundwater at a depth of 15 feet, but do not intend to excavate <br /> below the water table. When excavation is terminated, either because the limits of <br /> contamination have been reached or because of obstacles to further excavation, additional <br /> soil samples from the floor, sidewalls, or excavated soil may be collected as directed by <br /> PHS/EHD. All samples will be analyzed for TPH-g and BTEX. Because groundwater is <br /> already known to be contaminated and samples that are collected from monitoring wells are <br /> more reliable than those collected from an open excavation, we do not anticipate collecting <br /> a groundwater sample. <br /> After samples have been collected,the excavation will be backfilled with the segregated soil <br /> and supplemented with enough clean pea gravel to bring the excavation up to grade. A <br /> mechanical compactor will be used to compact the backfill material as needed. The <br /> contaminated soil will be trucked to Forward Landfill for disposal and the site will be <br /> resurfaced with asphalt. <br /> Upgradient will prepare a Tank Removal and Site Remediation Report when all laboratory <br /> work has been completed. <br />