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r 1 salinity level at Imperial Dam through the year 2010, without water quality improvement projects, is expected to follow the overall rising trend as shown in the graph. RECORDED SALINITY LEVELS AT IMPERIAL DAM WITH PROJECTIONS THROUGH THE YEAR 2010 IZOO :J 1100 ~ ~ '000 '" 0 :J IL 0 900 ..,.. '" 0 '" :3 100 0 gj 0 100 -' '" ~ 600 .00 1940 '000 1900 1970 ....- /' / / / / f , I -- -- Historical ____ PrOitcftdJJ 1010 1090 2000 2010 .11 Without Water Quality Improvement PrOQrom In response to the Federal Water pollution Control Act, as amended (Public Law 92-500), the Colorado River Basin States adopted numeric criteria for salinity at three points on the lower main stem of the Colorado River. These numeric criteria, shown below, have been approved by the Environmental Protection Agency: Station Annual flow-weighted concentration (mg/L) Below Hoover Dam Below Parker Dam At Imperial Dam 723 747 879 The CRwqIP goal is to maintain salinity concentration at or below the 1972 levels at the above three points while the Basin States continue to develop their compact-apportioned waters. To attain this goal by the year 2000 an estimated 2.8 million tons of salt per year must be intercepted before entering the river system. Uncompahgre Project Facilities The Uncompahgre Project irrigation delivery systems, constructed in the early 1900's, were cut directly into the saline soils and rock with- out benefit 'of lining. The nature and condition of the deteriorated facilities have resulted in conveyance system losses. These losses in turn contribute to the salt loading of the Uncompahgre River and, conse- quently, the Gunnison and Colorado Rivers. 11 000911 J