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COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT, Water Quality Control Division <br />Rationale — Page 3, Permit No. C00036251 <br />Note that because the limitations are set at either the water quality standards, or the federal ELGs, and <br />the discharge quantity is subject to the intensity and/or duration of a storm event, a flow limitation has <br />not been added at these outfalls. A flow limit is not needed as there is no dilution granted, and no matter <br />what the flow is, it would not change the limitations; however, documentation of snowmelt and rainfall <br />have been included in the permit for the three new outfalls (see Part 1.A.4. of the permit). <br />III.. RECEIVING STREAM <br />A. Waterbody Identification: COGULD03a, unnamed tributaries of East Paradox Creek and Bull Canyon. <br />B. Water Quality Assessment (WQA): <br />An assessment of the stream standards, low flow data, and ambient stream data has been performed to <br />determine the assimilative capacities for the unnamed tributaries of East Paradox Creek and Bull <br />Canyon, for potential pollutants of concern. This information, which is contained in the WQA, also <br />includes an antidegradation review, where appropriate. The Division's Permits Section has reviewed the <br />assimilative capacities to determine the appropriate water quality -based effluent limitations as well as <br />potential limits based on the antidegradation evaluation, where applicable. The limitations based on the <br />assessment and other evaluations conducted as part of this rationale can be found in Part I.A of the <br />permit. <br />Outfall 001A and Outfall 002A will continue to be the authorized discharge points to the receiving <br />streams. <br />Outfalls OO1B, 002B and 002C have been included in this permit. <br />IV. FACILITY DESCRIPTION <br />A. Industry Description <br />The Cotter Corporation JD -7 and JD -9 mines are underground uranium and vanadium mines. Prior to <br />1980, the design production rate was 150 tons /day. According to the rationale to the previous permit, <br />"the ore was not processed on site but was transported to the Cotter Canon City milling facility for <br />processing." Since 1980 the mines have not been actively operating. While not actively producing, the <br />JD -7 and JD -9 mines are kept in an active standby status ready to resume production. Since the mine <br />facilities are intermittent operations that, while not actively producing, do conduct mining activities, the <br />facilities are subject to the provisions of the Federal Clean Water Act and applicable State Discharge <br />Regulations. <br />1. Type of Industry — The JD -7 and JD -9 mine are underground uranium and vanadium mines. <br />2. Sources to the Treatment Plant — Water from the JD -7 and JD -9 waste dumps (1.98 acres and 2.4 <br />acres respectively), currently categorized as storm water in the SWMP, have been included in this <br />permit as process water. <br />The wastewater sources consist of dewatered mine water and process water from the mines waste <br />dump. Stormwater runoff is diverted so that it does not enter the ponds or treatment system. The <br />dewatered mine water is collected from the mines and pumped to sumps, when the sumps are full the <br />