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<br />The Rocky Flats Alluvium decreases in thickness as it extends to the east across the plant <br />site to become nonexistent near the eastern edge of the Rocky Flats Plant site. Several <br />seeps and springs exist at the contact between the Rocky Flats Alluvium and the underlying <br />Arapahoe Formation. These seeps and springs are the locations where the recharge which <br />occurred to the west on the Rocky Flats Alluvium comes to the surface and contributes to <br />the stream flows. In the eastern part of the plant site, small amounts of groundwater are <br />present in the colluvium and stream bed alluvium. <br /> <br />Some groundwater recharge of the bedrock on the plant site also occurs. The main water- <br />bearing units within the bedrock are the weathered claystones and lenticular sandstones. <br />Recharge to the bedrock is predominantly from precipitation coming in contact with these <br />formations at the outcrops to the west of the plant site and seepage from the Rocky Flats <br />Alluvium. l1li <br /> <br />