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<br />o <br />CO <br />(r) <br />N <br />r"', <br />-' <br /> <br />"-') <br /> <br />Control Forum, adopted by ear 11 of the Basin SLltf'S, ,lnd "PI'I'llVl'd hI <br />FPA. The stand,wds, set in tl'rms nf milli<l'\IIi1S 1'<'1" lil<',' (1'1<1'1 \ ,'I <br />tntal diss(11vt'd ,<'1 ids (TI1S). .11',': <br /> <br />Station <br /> <br />AIlI1Ud I <br />Flow-Weighted <br />Average TDS <br /> <br />Below Hoover Dam <br />Below Parker Dam <br />At Imperial Dam <br /> <br />723 mg/L <br />747 mg/L <br />879 mg/L <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 salinity concentrations in the Colorado <br />River from exceeding the standards. <br /> <br />. <br /> <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 CR~/QIP. In October 1980, <br />Public Law 96-375 specifically authorized feasibility studies on 10 <br />units of the CRWQIP, including the Lower Virgin River Unit (initially <br />known as the Littlefield Springs Unit), <br /> <br />Colorado River Salinity <br />The Colorado River, at its headwaters in the mountains of north- <br />central Colorado, has a salinity (dissolved mineral concentration) of <br />only about 50 mg/L. The salinity progressively increases downstream <br />as a result of water diversions and salt contributions from a variety <br />of sources. In 1979, the salinity concentration averaged about <br />810 mg/L at Imperial Dam, the last major diversion point on the <br />Colorado River in the United States. Without control measures, the <br />concentration is projected to increase, possibly reaching a level of <br />1,140 mg/L at Imperial Dam, by the year 2000. <br /> <br />2 <br />