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COLORADO DISCHARGE PERMIT SYSTEM (CDPS) <br />AMENDMENT NO. 4 <br />SUMMARY OF RATIONALE <br />TWENTYMILE COAL COMPANY <br />FOIDEL CREEK M/NE <br />CDPS PERMIT NUMBER CO-0042167, ROUTT COUNTY <br />1. TYPE OF PERMIT <br />1l. FACILITY /NFORAIATION <br />A. Facility Type: <br />Fee Category: <br />Annual Fee: <br />B. Legal Contact: <br />Amendment <br />Coal Mining, Mine Water &/or Prep Plant <br />Category 02, Subcategory 2 <br />x612 <br />William /vy, Mine Manager <br />29515 Routs County Road 27 <br />Oak Creek, CO 80467 <br />{303J + 879-3800 <br />C. Facility Contact: Richard Mills, Supervisor, Environmental Affairs <br />29515 Routt County Road 27 <br />OaF Creek, CO 80467 <br />(303J+879-3800 (FAX (303J+879-1997) <br />D. Facility Location: <br />E. Discharge Point: <br />/11. RECENINC STREAM <br />In the SW 1/4, SE 1/4, Section 29, TSN, R86W. <br />Outfall 002 is specified as the point ojdischarge from the new domestic <br />wastewater treannent facility prior to entering the Emerald Spring spoils <br />spring. See further discussion in section IV A. <br />For purposes of monitoring influent concentrations and flow, influent <br />monitoring point 3001 is being established in this permit amendment. <br />Poin7 3007 it defined as a poim prior to entering'thefirst aerated lagoon. <br />A. Identification, Classification and Standards <br />1. IdentiTication: Discharges ro Fish Creek, Segment 13b of the Yampa River Sub-basin of the Upper Colorado <br />River Basin. <br />2. ClassiFcation: This stream segtnem is classified jot the following uses: Recreation, Class I; Aquatic Life, <br />Class 1 (Cold); Agriculture <br />3. Numeric Standards: The standards which have been assigned in accordance with the above class fications can <br />be found in 3.3.0, Class~ations and Numeric Standards jot the Upper Colorado River Basin (5 CCR <br />1002-8J. It should be noted that this facility dots not discharge pollutanu which are Iunited by water qua(iry <br />standards with the uception of pH, total residual chlorine (IRCJ, fecal eoliform (FCJ and unionized ammonia. <br />These standards are shown on the following page. <br />