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<br />. <br /> <br />:~ <br />'- <br /> <br />. <br /> <br />Impact to ground and surface water woul~ be limited to <br />overland sediment transport during construction and the possible <br />depletion of water to evaporation if sediment retention/detention <br />or drainage structures are necessary to accomplish the project. <br />No discharge of dredged or fill material into the Colorado River <br />will result due to the project, and section 401 water quality <br />certification from the State of Colorado is not anticipated. <br />water quality studies will determine what control measures will <br />be needed to prevent surface sediment contribution to the river <br />during construction. Implementation of standard erosion and <br />sedimentation control techniques will keep water quality impacts <br />at an environmentally acceptable level. Impacts to water quality <br />will not occur if the project is not constructed. <br /> <br />contaminated Soils. Numerous remedial actions for the <br />removal of uranium mill tailings, currently being conducted by <br />the U.S. Department of Energy (DOE) in accordance with the <br />provisions of the Uranium Mill Tailings Radiation Control Act of <br />1978 (PL 95-604), are being accomplished in the vicinity of the <br />proposed project. Discussions with the DOE and its contractors <br />revealed that mill tailings along the tieback levee alignment <br />have already been remediated. The proposed project would be <br />coordinated with DOE during the feasibility study to insure that <br />all tailings in the rest of the alignment and in any revised <br />alignment would be remediated prior to construction. <br />contaminated soil will not be an issue if the project is not <br />constructed. <br /> <br />Conclusions of Environmental Considerations. Based on <br />cursory review of existing information, significant adverse <br />impacts are not expected from the flood control project. An <br />Environmental Assessment would be prepared and coordinated with <br />Federal, state, and local agencies which have jurisdiction in <br />this area and with interested organizations and individuals <br />during the feasibility study. If it is confirmed that <br />significant impacts will not result, a Finding of No Significant <br />Impact (FONSI) will be prepared to complete the NEPA <br />documentation requirements. If it is determined that significant <br />adverse impacts are associated with the project, an Environmental <br />Impact Statement will be required. <br /> <br />A-S <br />