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~ ~ The four salinity sources whose control Title II provides for are to the Paradox Valley Unit, the Grand Valley Unit, the Crystal Geyser ~ Unit, and the Las Vegas Wash Unit. 00 . .', The Paradox Valley Unit is located on the Dolores River in south- western Colorado near Cortez. It is estimated to contribute about 200,000 tons of salt per year to the Dolores River. The control facilities will include wells, pumps, solar evaporation ponds and other associated works. The concept is to lower the fresh water/brine interface by pumping wells along the Dolores River to prevent the brine from entering the river. The estimated pump discharge of 5-8 cfs would be transmitted via pipeline to an evaporation and salt storage reservoir (Radium reservoir) on the West Fork of Dry Creek about 20 miles to the southeast. The control system is expected to reduce the salinity contribution by 180,000 tons per year. Advance planning activities are scheduled to culminate in a Definite Plan Report by the end of Fiscal Year 1976. The data obtained in the December 1974 pump tests were analyzed. A layout of piezometer wells and two additional pump test wells was prepared. Simultaneous pumping tests of these two wells and the existing test well are necessary to determine the number and capacity of wells necessary to lower the saline water-fresh water interface. Data collection from ground water wells and Dolores River continues. Alternate plans to the plan described in the status report have been studied. All the alternates except an alternate pipeline route to the proposed evaporation reservoir cost more or had adverse environmental effects or both when compared to the plan discussed in the status report. The alternate pipeline route will be studied during the advance planning. When advance planning funds become available, specifications for foundation drilling of the Radium damsite and construction of access roads to the piezometer well sites will be advertised; a contract for EIS data for game animal population study will be negotiated. When the access roads are nearing completion, specifications for drilling piezometer wells and installing piezometers and for drilling the two test wells and pump testing the three test ewlls will be advertised. Concurrently with the Radium damsite founda- tion drilling, project personnel will drill the evaporation reservoir site, install weather stations to determine evaporation rates, continue the collection of quantity and quality data from ground water wells and from the Dolores River and begin preparation of a definite plan report. The Grand Valley Unit of western Colorado consists of about 76,000 irrigated acres. The salt contributed by the area is estimated at about 600,000 tons annually. Planned control measures include irriga- tion management services and irrigation systems improvement. 2