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<br />EPA [1]. The standards, set in terms of milligrams per liter (mg/L) <br />of total dissolved solids (TDS), are: <br /> <br />Station <br /> <br />Flow Weighted <br />Average TDS <br /> <br />723 mg/L <br />747 mg/L <br />879 mg/L <br /> <br />Below Hoover Dam <br />Below Parker Dam <br />At Imperial Dam <br /> <br />In response to this policy and related Federal and State program <br />enforcement guidelines, the CRWQIP was selected as part of the imple- <br />mentation plan to prevent sal inity concentrations in the Colorado <br />River from exceeding the standards. <br />In June 1974, Congress enacted the Colorado River Basin Salinity <br />Control Act, Public Law 93-320, which, among other things, directed <br />the Secretary of the Interior to expedite completion of planning <br />reports on salinity control units in the CRWQIP, including the <br />Colorado River Indian Reservation Unit. <br /> <br />Colorado River Salinity <br />The average salinity of the Colorado River at Imperial Dam in <br />1977 was approximately 820 mg/L, but because of increased use of river <br />water it is expected to increase s i gnifi cant ly in the future. There <br />is no universally accepted projection of the future salinity; a number <br />of Federal and State agencies have made projections using various <br />assumptions regarding hydrologic conditions and construction of pro- <br />posed projects that will cause additional diversions. However, most <br />of the projections indicate that, with the implementation of three <br />salinity control projects .V authorized under Public Law 93-320 but <br />without additional salinity control measures, the salinity will exceed <br />879 mg/L during the mid-1980's. <br /> <br />002840 <br /> <br />II The Paradox Valley, Grand Valley, and Las Vegas Wash Units. <br /> <br />2 <br />