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'" ..-l c\! N The TDS concentration is expected to increase from 439 mg/l to 533 mg/l at Rangely under leaching conditions, and under one to one salt balance conditions the TDS increase is expected to be from 439 mg/l to about 469 mg/l (although Rangely is upstream from Watson, the mineral concentrations are not expected to change in this reach of stream). Since there are no other water sources of better quality available, a water with 533 mg/l TDS is acceptable under these conditions according to U. S. Public Health Service Drinking Water Standards 1962. Hardness is expected to increase from 202 mg/l to 245 mg/l under leaching conditions and with a one to one salt balance the hardness is expected to increase from 202 mg/l to 216 mg/l. The 43 mg/l increase in hardness will result in a present day damage to the domestic water users in Rangely of $1,300 per year and in the year 2065 a damage of $3,400 per year. The 14 mg/l increase will result in a $400 per year damage and in the year 2065 a damage of $1,000 per year.* Effect of Removal of Meeker Spring Since Meeker Spring is responsible for a substantial portion of the mineral pollution in the White River Basin, removal of the spring was considered as a beneficial Project feature. If the TDS contribution of the spring were eliminated by the Project, the net TDS change under Project conditions when considering a one to one salt balance would be a reduction of 42 mg/l at Watson, Utah. With leaching considered, the net TDS concentration change without the spring is only a 22 mg/l in- crease rather than a 94 mg/l increase. See Table II. With the hardness contributed by the spring removed, the hardness in the White River at Rangely would be reduced 11 mg/l. An 11 mg/l reduction in hardness, with the present population, would result in a savings of $300 per year both without the Project and with the Project under any salt load. With the population projected for 2065, the savings would be $900 a year under the same conditions. See Table III. An additional savings could result for Meeker since Meeker may no longer have to maintain a municipal supply intake line to a point upstream of the spring. Streamflow regulation within the White River Basin could be used to improve quality during periods of low flow, but would not improve the average annual mineral quality. In order to offset the change in water quality due to Project development, it would be necessary to import better *Based on data from "Economics of Water Softening", by Louis R. Howson, Journal of the American Water Works Association, February 1962, and ''Water Hardness and Domestic Use of Detergents", by Lloyd M. DeBoer and Thurston E. Larson, Journal of the American Water Works Association, Vol. 53, July 1961, No.7.