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<br />- 12 - <br /> <br />. <br /> <br />and 55 mg/l respectively, while they were 2350 and 3520 mg/l just above <br />the entry of the San Miguel River. Uravan mill takes brine solution for <br />its ion exchange process from a well northeast of Bedrock, on the north <br />side of Paradox Valley, east of the Dolores River. Several wells have <br />been drilled in this same general area recently to furnish brine for oil <br />field use in southeastern Utah. From these considerations, it appears <br />likely that the noted increases in sodium and chloride concentrations <br />are probably due to natural causes. <br /> <br />The useful potential of this stream is decreased greatly by its <br />high dissolved solids, sulfate, sodium, and, below Bedrock, chloride <br />contents. This is attested by the fact that local farmers choose not to <br />use river water for irrigation when the flow is low unless there is no <br />ocher alternative. Any industry locating on the river in the area from <br />Slick Rock to the entry of the San Miguel River and needing soft water <br />might be put to considerable expense if the Dolores River were the only <br />available source of supply. Primary causes for the above-mentioned high <br />concentrations of most of these constituents are probably upstream soil <br />types and uses (5). Notice is taken of the sulfate contribution from <br />Slick Rock plant seepage (about 2200 pounds/day, based on river flows) <br />as another cause of high sulfate concentration downstream from the <br />plant. <br /> <br />San MiRuel River - Uravan Area <br /> <br />As mentioned before, it is assumed that flows of the San Miguel <br />River are essentially equal above and below the Uravan mill. Table VII <br />gives estimated annual average effluent flow rates with some characteris- <br />tics of each stream (10). <br /> <br />TABLE VI I <br />URAVAN EFFLUENT STREAM CHARACTERISTICS <br /> <br />Station <br /> <br />Name <br /> <br />Flow, cfs <br /> <br />Major Dissolved Materials <br /> <br />US-8 <br /> <br />Red Cake <br />1'a il ings <br />Liquor <br /> <br />0.16 <br /> <br />H2S04, Na2S04 <br /> <br />US-9 <br /> <br />Plant 5 <br />Pont Overflow <br /> <br />0.56 <br /> <br />(ml4) 2S04 ,BaC03 <br />or BaC12 <br /> <br />US-lO <br /> <br />Yellowcake <br />1'ailings <br />Liquor <br /> <br />0.16 <br /> <br />NaCl, Na2S04 <br /> <br />US-ll <br /> <br />Ditch Drainage <br /> <br />0.11 <br />