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CHAPTER .I .INTRODUCT.ION tt.) l\) CO Q) Subsequent to the passage of the Colorado River Basin Salinity Control Act, the Bureau of Reclamation conducted an appraisal investigation of the Glenwood-Dotsero;'Springs Uni,t. This investigation included the use of infrared photography, to identify ,thermal springs" chemical analyses of water samples, and prelimi!ll!ry, evaluations of control methods . Cons;l.deration was given to desalting by use of either one or two plants and accompanying evaporation ponds. Other methc;>dscollsidered included evaporation POllds without, desalting plants, injectionofsprillg waters into deep wells, plugging or grouting the springs, and the use of ,the saline flows for bene:ficial purposes. Based on,,' the l~ited studies and technology at that time, the most feas- ible means for control of salt from the,identified sources appeared to be the multistage flash distillation process with a single plant near the town of New Castle. The plant would have been supplied by collection systems at both Dotsero and Glenwood Springs and a pipeline to the plant. The appraisal studies were essentially completed in 1975, but a final re- port has "not,been:published. Current Activities Since completion of the appraisal studies in 1975 data gathering has con- tinued. The U.S. Geological Survey operates gaging stations in the study area at several points ,on the Colorado River and on the principal tributaries. These stations are used ,for measuring continuous stream:f10ws and/or measuring water quality by electrical conductivity. The Water and Power Resources Service is measuring and sampling on a regular basis SOme of the springs near Dotsero and G1enwood Springs. Labora- tory analysis of the water samples is being performed to identify'and quantify common chemical constituents and total dissolved solids. 5 ,,'" . . .