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ARCOSA <br /> elevations than any exposed alluvial materials, thus, water quality impairment for waters in the <br /> alluvial materials is unlikely. <br /> 6. Most groundwater wells used by adjacent landowners are screened within the alluvial deposits <br /> and are closer to Coal Creek. <br /> 7. Alluvial deposits located at higher elevations than Coal Creek contain intermittent groundwater <br /> and generally drain quickly. Refer to Exhibit G for surface water and groundwater hydrology <br /> details. <br /> Based on the considerations listed above, the permeability of the Pierre Shale formation, and the <br /> proximal distance of groundwater, the potential is very low for the leaching of contaminants from post- <br /> processed soil materials used as backfill. <br />