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iii iiiiiiiiiiiuiii <br />STATE OF COLORADO <br />Roy Romer, Governor <br />Patti Shwayder, Acting Executive Director <br />Rdrea[ed to protecting and improving the heahh and environment o/tbe people of Colorado <br />4300 Cherry Creek Dr. S. Laboratory Building <br />Denver, Colorado 80222-1530 4210 E. 11th Avenue <br />Phone (303) 692-2000 Denver, Colorado 80220-3716 <br />(303) 691-4700 <br />Water Quality Convol Division <br />WQCD-PE-B2 <br />(303)+692-3500 FAX (30J)+782.0390 <br />April 2, 1996 <br />Kimberley A. Wolf <br />Environmental Engineer <br />Colowyo Coal Company, LLC <br />5731 State Highway 13 <br />Meeker, CO 81641 <br />RE: Chemical Approval <br />Colowyo Coal Co - Colowyo Coal Mine <br />CDPS COG850017 <br />Moffat County <br />Dear Ms. Wolf: <br />~~ <br />.. RcrGI~IF~1 <br />, p,PR p 4 iyy6 <br />OF'CO[O <br />Ne <br />~~! 4~ <br />~ r8'!6 ~ <br />Colorado Deparunent <br />of Public Health <br />and Environment <br />ptvisi°° °~ M`neta~s ~,~e°~uyY <br />The Division has reviewed your request for authorization to use United 228 Flocculent for treatment of waters <br />that will or may be discharged from outfall 010 (East Taylor Pond). <br />We have reviewed the information submitted by you with your request, including supplemental information faxed <br />to me. We have also had telephone conversations with representatives of United Laboratories, the chemical <br />manufacturer. Although the Material Safety Data Sheet (MSDS) contains no aquatic toxicity data, the <br />manufacturer has stressed that this chemical is not toxic to aquatic life when used at the recommended <br />concentration. They supplied LCSe data for the chemical concenvate (prior to any dilution with wastewater) for <br />five species. While these LCSe concentrations are low, it is not expected that combined effluent (at 2000:1 <br />dilution) LCSe values would be low as a result of this chemical. We conclude that use of this chemical should not <br />add observable toxicity to the dischazge. <br />On this basis, we will authorize use of this chemical for the purpose requested at approximately 1:2000 <br />concentration, as indicated in your letter. No additional permit conditions are necessary for this use. If any <br />adverse conditions in the receiving water are observed as a result of use of this chemical please notify the Division <br />immediately. <br />Please contact me at (303)+692-3605 if you have questions. <br />Sincerely, <br />on . Kubtc <br />Environmental Protection Specialist <br />Permits and Enforcement Section <br />WATER QUALITY CONTROL DIViSiON <br />xc: Kathleen Sullivan, Permits and Enforcemen[Section, WQCD <br />Jim Chubrilo, Field Support Section, WQCD <br />Larry Rou[ten, CO Division of Mine[als and Geology <br />Technical Enforcement Program, EPA <br />Local Health Department <br />