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The stock tanks collect surface runoff from surrounding reclaimed and <br />undisturbed lands. This runoff can be expected to be alkaline, as native topsoil <br />has been replaced on the mined areas. The stock tanks are on Segment 03e of <br />the Yampa River system. Stock tanks A through F discharge to ephemeral <br />drainages that drain to the Streeter Pond (CDPS outfall 001A). Stock tanks M <br />and L discharge to ephemeral drainages that drain to Gulch A Pond (CDPS <br />outfall 004A). The two outfalls discharge to Good Spring Creek, a tributary <br />of Wilson Creek which flows to the Yampa River. <br />Flow occurs in Good Spring Creek and Wilson Creek only during certain <br />times of the year or in response to rain or snowmelt events. Outfalls 001 A and <br />004A have been monitored for more than 10 years for flow rate, pH, total <br />dissolved solids, total suspended solids, settleable solids, and oil and grease. <br />4.05.9 (13) (a) The quality of the impounded The only exceedances of CDPS limitations at the two outfalls in the last 10 <br />water shall be suitable on a permanent basis for years were one exceedance of the total suspended solids limitation at each <br />its intended use, and discharge of water from outfall. One of these exceedances received an exemption from the Colorado <br />the impoundment shall meet applicable State Yes Water Quality Control Division (CWQCD); regulatory review of the other <br />and Federal water quality standards and shall exceedance has not been concluded, although the mine operator has requested <br />not degrade the quality of receiving water an exemption from the CWQCD. The stock ponds are not likely to have <br />below applicable stream standards; contributed to the exceedances, as they inhibit sediment yield from the area, <br />rather than promote sediment yield. <br />The discharge monitoring data from the outfalls 001A and 004A has been <br />reported in AHRs for more than 10 years and indicates water from their <br />drainage areas where the stock tanks are located has been suitable for the <br />intended use of livestock and wildlife watering. Discharges from the two <br />outfalls have been alkaline, having acceptable TDS and iron content, and <br />usually low TSS. Livestock and wildlife have used the stock tanks without <br />incident for several years. The long history of compliance with the discharge <br />limitations at the outfalls indicates discharges from the stock tanks will not <br />cause exceedances of those stream standards for which discharges from the <br />two outfalls have a reasonable potential of contributing to an exceedance <br />(according to the CDPS discharge permit limitations those standards are: pH, <br />TSS, total recoverable iron, settleable solids, and oil and grease).