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<br />salinity level at Imperial Dam through the year 2010, without water <br />quality improvement projects, is expected to follow the overall rising <br />trend as shown in the graph. <br /> <br />RECORDED SALINITY LEVELS AT IMPERIAL DAM <br />WITH PROJECTIONS THROUGH THE YEAR 2010 <br /> <br />t200 <br /> <br />900 <br /> <br /> <br />,...- <br />..- <br />/ <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />---. <br /> <br />1100 <br /> <br />:; <br />?3 <br />! <br /> <br />'000 <br /> <br /><J> <br />C <br />~ <br />o <br /><J> <br />C <br />"' <br />:; <br />o <br />ill <br />c <br />..J <br />C <br />~ <br />o <br />~ <br /> <br />100 <br /> <br />Hi.toMeol <br /> <br />700 <br /> <br />____ Pr'oilCftd.v <br /> <br />600 <br /> <br />.00 <br />1940 <br /> <br />"'"" <br /> <br />1960 <br /> <br />It'" <br /> <br />1910 <br /> <br />1990 <br /> <br />2000 <br /> <br />2010 <br /> <br />...u Without Wattr Ouality Impl"'ovtment Pl"oQNJm <br /> <br />In response to the Federal Water Pollution Control Act, as amended <br />(Public Law 92-500), the Colorado River Basin States adopted numeric <br />criteria for salinity at three points on the lower main stem of the <br />Colorado River. These numeric criteria, shown below, have been approved by <br />the Environmental Protection Agency: <br /> <br />Station <br /> <br />Annual flow-weighted <br />concentration (mg/L) <br /> <br />Below Hoover Dam <br />Below Parker Dam <br />At Imperial Dam <br /> <br />723 <br />747 <br />879 <br /> <br />The CRWQIP goal is to maintain salinity concentration at or below the <br />1972 levels at the above three points while the Basin States continue to <br />develop their compact-apportioned waters. To attain this goal by the year <br />2000 an estimated 2.8 million tons of salt per year must be intercepted <br />before entering the river system. <br /> <br />Uncompahgre Project Facilities <br /> <br />The Uncompahgre Project irrigation delivery systems, constructed in <br />the early 1900's, were cut directly into the saline soils and rock with- <br />out benefit of lining. The nature and condition of the deteriorated <br />facilities have resulted in conveyance system losses. These losses in <br />turn contribute to the salt loading of the Uncompahgre River and, conse- <br />quent ly, the Gunnison and Colorado Rivers. <br /> <br />11 <br /> <br />(!(i7n(\. <br />~ "-'.l ...,~, <br />