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. . . 4. Studv Participants and Coordination. , The study sponsors were the city of Grand Junction and Mesa County. By letters dated 9 March 1989 and 2 March 1989 (Appendix D), the City of Grand Junction and Mesa County requested a flood control study for this area. Close coordination has been maintained between the sponsor and the Corps since the inception of the study. The DOE has two ongoing uranium tailings removal projects in the area--the Uranium Mill Tailings Remediation Program and the Vicinities Program--for cleaning up radioactive tailings which have been used for construction fill. The first project is upstream of the study reach; the second, or Vicinities Program, has largely been executed in the study area. The DOE and its consultants and contractors have participated in the Corps scoping process, and continual coordination has been maintained with them. The Environmental Impact statement (EIS) written by the DOE has been a resource document for this study. continual coordination has also been maintained by the Corps and the study sponsors with the following organizations: U.s. Fish and Wildlife Service, Colorado Water Conservation Board, Colorado Division of Parks and Outdoor Recreation, Mesa County Health Department, Grand Junction/Mesa County Riverfront commission, and the Denver and Rio Grande Western Railroad. The local utility companies have also been contacted by the study sponsor to delineate the various utility lines in the study reach. 5. Previous Flood Control Improvements and Studies. Flood Control Improvements. A basket/rock masonry floodwall was constructed along Riverside Park Drive in Riverside during the 1930's for flood control by non-Federal interests. since that time, additional fill has been periodically placed on top of the wall. Stabilization efforts on the riverside of the floodwall included dumped boulders, concrete and asphalt rubble, and driven railroad rails. In 1983 and 1984, when floodwaters threatened the Riverside area, the city of Grand Junction placed an emergency levee along Riverside Park Drive. The material from the levee was pushed to the top of the riverbank after the flood and now constitutes a spoil levee about 4 feet high from the intersection of Riverside Park Drive and West Colorado Avenue to an area of miscellaneous fill downstream of Hale Avenue. The area from the downstream end of the aforementioned spoil levee to the Highway 340 bridge is protected by a formal levee recently constructed by the City of Grand Junction as part of the riverfront park and bicycle trail project. 3