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. . GLENWOOD-DOTSERO SPRINGS UNIT COLORADO RIVER WATER QUALITY IMPROVEMENT PROGRAM Work Statement 1. INTRODUCTION The Glenwood-Dotsero Springs Unit lies along a l6-mile reach of the Colorado River between Glenwood Springs and Dotsero in west central Colorado. At each end of Glenwood Canyon, numerous thermal saline springs and associated ground water systems combine to make the largest point source contribution of total dissolved solids (over 500,000 tons/year) in the Upper Colorado River Basin. The Dotsero Springs are at the upper end of Glenwood Canyon and the Glenwood Springs are at the lower end. 1.1 Purpose of the Investigation The purpose of the Glenwood-Dotsero Springs Unit investigations is to interpret the saline ground water systems and identify, study, and evaluate alternative plans, which if implemented, would reduce the current salt con- tribution. Each alternative plan will be evaluated by the contractor from technical and economic standpoints, and an environmental assessment will be prepared for each plan. Of particular concern will be disposal methods because of the large volume of water and salts produced by these springs and possibly by other units of the Colorado River Water Quality Improvement Program. Because of this large volume, the search for disposal locations may encompass a large study area. This solicitation is designed to obtain the services necessary to conduct these studies. 1.2 Objectives of the Investigation The objectives of the investigation are to identify plans that would substantially reduce the salt contribution to the river. Data and information gathered by the contractor will be used by Water and Power and will be the basis for selecting a plan to control the Glenwood-Dotsero Springs Unit salt contributions. 1. 3 Authority The Colorado River Basin Salinity Control Act of 1974, Public Law 93-320 (88 Stat. 266, June 24, 1974), provides for the construction, operation, and maintenance of certain works in the Colorado River Basin to control the salinity of water available to users in the United States and Mexico. Title II of the Act provides for the construction, operation, and maintenance of four salinity control units as the initial stage of the Colorado River Basin Salinity Control Program. Title II of the act also provides for expediting feasibility level planning of 12 other control units. The Glenwood-Dotsero Springs Unit is one of the 12 units authorized for feasibility level planning. Another unit, the Meeker Dome, was added after passage of Public Law 93-320. D-l