2013-12-17_PERMIT FILE - C1992081 (13)

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o = the sum of the contaminant and receiving medics flow rates expressed in acre-feet/day f = a Constant factor equal to 0.00136 and used for converting [he product of acre-feet and milligrams/liter into tons High Flow Analysis: Coal leachate L = 0.0066 x 300 x 0.0027 0.0053 tons/day High flow L = 148 x 1360 x 0.0027 = 543 tons/day + = lowest TDS value measured in Dry Creek historically DSC (leachate/high floe) 0.0053 543 = 543.0053 = 1360 mgJl 1.984 x 148.0066 x 0.00136 .39936 The coal leachate will cause no change in the 10-year, 7-day high flow water quality for Dry Creek in the vicinity of the loadout. Lou Flow Analysis: Coal leachate L = 0.0066 x 300 x 0.0027 = 0.0053 tons/day Lou flow l = 0.}4 x 1360 x 0.0027 = 0.514 tons/day • DSC (leachate/low ffou) 0.0053 0.514 = .5193 = 1315 mg/l 1.984 x 0.1466 x 0.00136 .000395 The coal leachate will cause no change in the approximate 10-yea r, 7-day low ffou eater quality for Dry Creek in the vicinity of [he loadout. Ground eater Quantity There are no pit excavations associated wi [h the loadout that could necessitate the pumpage of ground water. The production cell for the loadout is completed in the Yampa River alluvium (see Exhibit 13-1) and piped to the loadout for use. The well is righted for 70 acre-feet/year but projected water uses at the loadout are for only one-half that amount, withdrawals from the well will be derived principally from the Yampa River as the alluvial aquifer is in hydraulic communication with the Yampa River. Considering the typical ffou rates in the Yampa, it is questionable uh ether the affects of [he alluvial well pumpage on Yampa flow could even be measured. As a mi[~gative measure, HGT does not plan to beneficially use the walker Ditth eater right (sold [o HGi along with the loadout) . referenced above and to apply a majority of that water right to offsetting any impacts to 6 Revised 04/18/94