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contribution constitutes about 98 of the total salt load in Trout <br />Creek downstream from Middle Creek and represents an increase of <br />about 10.38 over baseline Trout Creek conditions. Present down- <br />stream Trout Creek total dissolved concentrations during low flow <br />conditions are well below levels that might cause concern with <br />respect to irrigation. <br />Future backfill contributions are <br />increase of about 122 mg/1 in <br />assumptions. This represents an <br />baseline Trout Creek conditions. <br />tions are projected to constitut <br />load in Trout Creek downstream fro <br />Specific Chemical Parameters <br />projected to account for an <br />Trout Creek under worse case <br />increase of about 228 over <br />The backfill solute contribu- <br />e about 168 of the total salt <br />m Middle Creek. <br />Certain chemical parameters in backfill discharges are at <br />concentration levels that are higher than suspect levels for <br />irrigation water use. Irrigation water standards are not <br />applicable for discharges to Foidel Creek as water for the creek <br />has not been historically used for irrigation. The first diver- <br />sion of water that may be affected by backfill discharges to <br />Foidel Creek is at the Jefferson Ditch on Trout Creek downstream <br />from Middle Creek. The salt load analysis performed on Trout <br />Creek indicates a present solute contribution from the backfill <br />of about 98. Exceedences of irrigation water standards for <br />specific ions are not anticipated on Trout Creek as a result of <br />backfill discharges. <br />Foidel Creek water quality standards have been based on Class III <br />cold water acquatic standards as part of Seqment 13 of the Yampa <br />River (Trout Creek and Tributaries). The backfill discharges to <br />Foidel Creek area controlled by NPDES permit limitations set by <br />the Colorado Department of Health (CDOH). <br />19 <br />• <br /> <br />• <br />