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CRBSCP and CRWQIP e\'aporalion pond. Industrial use could be an alternative if slIch a use can be identified. Lower Gunnison Basin Unit. - Plans for reducing saline water consist of rehabilitating the canal and lateral systems where excessi\:e seepage is occurring. Also. the winter water use of the canals will be terminated, and water for livestock use will be deli,'ered through an expanded domestic system. This is the most cost-effective alternative being investigated. A feasibility report was completed in NO\:ember 1982, a Draft En\'ironmental Statement was filed in January 1983, and advance plan- ning studies were initiated in fiscal )'ear 19M. Big Sandy Rit'er Unit. - Plans call for collecting the saline water by pumping from a well field and delivering to industrial plants near Rock Springs, Wyoming. Other industrial uses would be included as demands develop. Price-San Rafael Rivers Unit. - Plans call for lining canals and Block.-watering pondB in the area. Dirty Devil River Unit. - This unit is still under initial investigation to determine major sources of salt loading. fvleeker Dome Unit. - Unplugged exploratory holes in this unit were cleaned and plugged with grout from top to bottom. Monitoring shows the salt loading hat! been significantly reduced. No further work anticipated al this time. LaVerkin Springs Unit. - Plans for collection and di~posal of saline water have been determined to be not cost effecth'e at this time. Lower Virgin River Unit. - Studies have been reo initiated to in\.estigate the \'iability of capturing Lower Virgin Ri\'er saline underflows and surface flows and diverting them for industrial use as powerplant cooling water. Palo Verde Irrigation District Unit. - Preliminar)' studies indicate that lining canals in coorclinatioll with on farm impro\'ements would reduce salt loading into the Colorado River. Saline Water Use and Disposal Opportunities Unit. - This unit is studying the potential of a pipeline to transport coal, 88line water. and other commoditieg to the west coa!;l or to intermediary points of use. Also. required sampling stations have been established in conjunction with geologic im:estigations in each river basin. 5 DEVELOPMENT History Increases in the salinity levels of western rivers is not a new or unique situation. Water quality problems in the Colorado River were recognized as early 88 1903. The Colorado River salinity problem has been the object of sc\'eral studies and in,.estigations., and numerous surveys of salinity sources and control measures have been pursued over the years by the Bureau of Reclamation. Geological Surve}'. Environmental Protection Agency, Water Resources Council. Colorado River Board of California. Basin States, and several unh.ersities. In 1972, a joint Federal-State enforcement conference on the subject of pollution of interstate waters of the Colorado River and ill' tributariC8 initiated formal effortl' to establish an o\'erall salinity control polic}'. Conferees concluded that such a policy would have as its objecth.e, "'the maintenance of salinity concentrations at or below le'ieh. found in the lower main stem of the Colorado Rh'er in 1972." It also was recognized that States had rights to continue development of their compact-ap- portioned waters and that temporary rises in salinity might occur until the salinity control program became effective. Authorization Authorized by the Colorado River Basin Salinity Control Act of 1974, (p.L. 93-320, 88 Sial. 266, June 24, 1974). Title I provides for measures to enable the United States to comply with its obligation under the agreement with Mexico of August 30, 1973, Minute No. 242 of the International Boundary and Water Commission. United States and Mexico. Title II. ef!lscntially the Colorado River Water Quality Improvement Program, provides for measures upstream of Imperial Dam necessary to sta- bilize the salinity of the Colorado River. The Public Works Appropriation Act of 1975 provided funding for the start of ad'.ance planning activities on the four authorized units. Title II pro,'idcd for feas- ibility in\'estigations and planning and implementing the other units. Construction The Paradox Valley, Grand Valley, Crystal Geyser, and Las Vegas Wash Units were authorized for construction hy Tille II of Public Law 93.320. Major struclural features of these units. with the exception of Crystal Geyser. in,'olve construction of facilities such as wells.