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W "l co 0') Las Vegas Wash (Reclamation). Las Vegas Wash is a natural drainage channel providing the only surface water outlet for the entire Las Vegas Valley. The lower portion is now a perennial stream as a result of waste water effluent and ground water discharges. Flow in the Wash has increased steadily in recent years due primarily to increased sewage discharges resulting from a rapidly growing population. This wastewater carries a salt load of 160,000 tons per year and leaches an additional 90,000 tons of salt per year as the water flows into the Wash. Over strategies strategies develop a a number of years, Reclamation identified several for reducing salinity in the Wash. However, none of the were cost effective. Reclamation ceased its efforts to salinity reduction program for the Wash. Prior to discontinuing its efforts, Reclamation constructed a pipeline to convey industrial water discharge in Henderson to the Wash (Pittman). This water was previously released to an open ditch and a portion of the water infiltrated leaching salt on its way to ultimate discharge in the Wash. Confinement of the ,water to a pipe reduced salt in the Wash by an estimated 3,800 tons a year. A final planning report on Reclamation salinity control efforts in Las Vegas Wash was completed in September 1989. Uinta Basin (Reclamation and USDA). The Uinta Basin Unit is in northeastern Utah and includes portions of Duchesne and Uinta Counties and contributes about 450,000 tons of salt annually to the Colorado River System. Return flows from 204,000 acres of irrigated land account for much of the salt contribution. Reclamation Phase I studies showed the only viable alternative in the study area is canal lining. About 56 miles of the total 240 miles of canals and laterals in the Uinta Basin would be lined. Project implementation would reduce the salt load to the Colorado River by an estimated 21,000 tc 30,000 tons per year and reduce canal seepage by about 16,800 acre-feet per year, of which about 4,600 acre-feet could be used to reduce irrigation shortages. A planning report/draft environmental impact statement on the unit was filed with Environmental Protection Agency and released to the public on April 25, 1986. The final document was completed and filed with the EPA in 1987. Congressional authorization of Uinta Basin Phase I is needed before implementation can proceed. The Phase II study was completed in 1989. The study evaluated the salinity control poteh~ial of areas and opportunities not studied under the Phase I program. The My ton Townsite Canal be included in the planned improvements for the unit. Lining 3.2 miles of the My ton Townsite ,Canal would remove 2,150 tons of salt at a cost effectiveness of $90 per ton. The report also recommends evaluating a winter water replacement program alternative in future studies. 32