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OC2968 Of the 17 control units. 4 have been authorized for construction. The units are located at Paradox Valley and Grand Valley in Colo- rado, Crystal Geyser in Utah. and Las Vegas Wash in Ne- vada. Title" of Public Law 93-320 also calls for the ex- peditious completion of planning reports on 12 units identified in the act as well as approving the Meeker Dome unit for study. At Paradox Valley, the basic control plan calls for inter- cepting saline ground water which now flows into the Dolores River carrying 200,- 000 tons of salt per year from a natural salt dome. A shal- low-well interception facil- ity will remove the brine (260000 mg/L) at a rate of 180.000 tons per year via pumping to a large evapora- tion pond for disposal. In Grand Valley. the con- trol of about 410,000 tons of salt originating in irrigated Crystal Geyser in eastern Utah Drip irrigation significantly reduces water use areas underlain by saline shale will depend on lining canals and laterals, and irri- gation efficiency improve- ments. At Crystal Geyser. intermit- tent saline geyser flows (14000 mg/L) would be ponded and removed by a gravity pipeline to a nearby evaporation pond. Con- struction of this unit has currently been deferred because of low cost effec- tiveness of the control works. Las Vegas Wash presently receives all the wastewater from Las Vegas Valley and discharges the surface and ground-water flows into Lake Mead. A ground-water interception facility will re- move more than 41,000 tons of salt per year. The brackish ground water will be evap- orated from nearby solar ponds. Recovery of some of the brackish water may be possible with desalting treat- ment in later stages of the project.