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i~ <br />'OLORADO DEPARTMENT OF HEALTH, Wnter Quality Corztro! Division <br />atianale-Pnge 1. Permit No. CO-0018076 <br />III. RECEJVING STREAM <br />B. Receiving Water Data <br />FABL Environmental Regulatory Specialists, Inc has performed an assessment of the stream standards, low flow data, and ambient <br />stream data for the Water Quality Control Division, and determined the assimilative capacities of this water body for the pollutants of <br />concern. The Permits Unit has reviewed the assimilative capacities and determined the appropriate water quality based permit <br />limitations. This information can be found in Appendix A and Table VI- 1 of the rationale. <br />IV FACILITY DESCRIPTION <br /> <br />A. Industry Description <br />1. Tvna nt /nd~:c[rn: Th¢ facility consists of a coal mine with both surface and underground workings and related activities. See <br />the previous permit rationale and subsequent amendments for a description of the operation. <br />2. Snnrr¢c en the Trrahnant Plnnr (Changes from previous permit) Few changes have been made since the most recent permit <br />amendments which added mine water discharge points to cover moving discharges as mining progresses. The permittee's <br />intention is to inactivate earlier mine water disch¢rge points when they are no longer needed. To date this has not been <br />necessary, all ezisting mine water discharge points are still being used. <br />3. Chem;ra/c rzcvA,- At this time, the permittee may use two chemicals to treatment or related activities that could impact <br />discharges. One chemical, Na]co ENACT 7883, an aluminum suljare compound, has been previously reviewed and approved by <br />the Division. The second chemical, United 657 Zyme-Flow is a biogradable enryme. Aquatic testing data were supplied for this <br />ch¢mical. The acute 96 hour LCso for stickleback and fathead minnows is 71 mg/l. The no observable effect level (NOEL) for <br />both species is 50 mg/1. Based on this data, the Division believes this chemical es safe a[ the recommended application rates and <br />is approving its use at this lime. <br />B. Wastewater Treatment Description <br />No changer have occurred in the treatment system, other than those generally described in the previous section. Pursuant to the <br />authority aj Article 9, Title 25, Regulations for the Certification of Water Treatment Plan! and Wastewater Treatment Plant <br />Operators, every water Meatment facility, domestic or industrial wastewater treatment facility shall 6e under the supervision of a <br />certified operator holding a certfication in a class eguol to or higher than the class of th¢ facility, The Operator Cert~cation Board <br />it within the Colorado Department of Public Health and Environment and should be contacted at (303) 691-3550 for any questions <br />' relative to specific requirements. The permittee employs a Class D certified wastewater operator to conform to Article 9, Tir1e 25, <br />Regulations for the Certification of Water Treatment Plant and Wastewater Treatment Plant Operators. <br />RPERFORMANCE HISTORY <br />A. Monitoring Data <br />1. Decrharv~v !Wnnlrnrino RYnrte: Tables V-1 through V-4 summarise the effluent data reported on the quarterly Discharge <br />Monitoring Reports (DMR's) for the Blue Mountain Energy facility from January, /997 through Decembeq 2001. During the <br />period reviewed, outfalls 002, 003, 004, 005, 006, 007, 008, 009, 024, 025, 026, and 028 generally reported "no discharge. " <br />Outfalls 001 and 024 reported consistently throughout this period. Outfalls 023 and 029 have since been reclaimed and are no <br />longer included in this permit. <br />Flow, MGD <br />r1 <br />~_J <br />30-day avg <br />daily max <br />pN, s. u. <br />rss, mgn <br />30-day avg <br />daily max <br />0.0208/0.0025/0.133 None <br />0.46!6/0.0043/80.02 None <br />-/6.9/8.95 6.5-9.0 <br />12.54/<5/35 35 <br />12.54/0/35 70 <br /> <br />