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l- I- l- I- l- I- l- I- l- I- l- I- l- I- l- I- l- I- 1- 374';' which accounted for up to 476,000 tons of dissolved solids annually. Two springs below Dotsero and nine springs near Glenwood Springs accounted for approximately half of this total. Other springs occur near Hot Sulphur Springs, the Blue River near Dillon, and several tributaries to the Roaring Fork Basin. There was evidence that other thermal springs rise in the bed of the river. An additional 738,000 tons per year was discharged to the river through natural runoff. The total salt load discharged to the basin by natural sources was determined to be 1,214,000 tons per year. Man caused sources of salt loads make up a much smaller portion of the total basin yield. An increase in dissolved solids due to irrigation was determined to be approximately 361,000 tons per year. The remaining 2,400 tons were at tr ibuted to municipal and industrial use of water. EPA - Mineral Quality Problems The EPA study divided the Colorado mainstem to Cameo into three separate study areas. The salt budget for the three study areas has been consolidated and is presented below. TDS Load (tons/year) Percent of Total Load Source Irrigation Runoff Industrial Effluents Springs 166,000 912,000 19,000 498,000 1,595,000 10.6 57.2 1.1 31.1 -15-