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iii-i ii i ii i ii iiii iii <br />999 <br />STATE OF COLORADO <br />Roy Romer, Governor <br />Patti Shwayder, Acting Executive Director <br />Dedicated to protecting and improving the health and environment of the people o/Colorado <br />4300 Cherry Creek Dr. 5. Laboratory building <br />Denver, Colorado 80222-1530 4210 E. 11th Avenue <br />Phone (303) G92-2000 Dcnver, Colorado 80220-3716 <br />(3031691-4700 <br />Water Quality Control Division <br />WQCD-PE-n2 <br />(303)+692-3500 FAX (303)+792-0790 <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 COG-850017 <br />Moffat County <br />Dear Ms. Wolf: <br />OF.~~~ <br />ti~ 9 <br />~'~~ <br />~ /976 ~ <br />Colorado Department <br />of 1aublic Health <br />"and Environment <br />:. <br />APR ~ 4 1`1t~F <br />• ~~I\~~t2'~ t' .~~.J\'~yJ <br />The Division has reviewed your request for authorization to use United 228 N7occulant 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, [he chemical <br />manufacturer. Although the Material Safery Data Sheet (MSDS) contaias 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 LC30 data for the chemical concentrate (prior to any dilution with wastewater) for <br />five species. While these LCao concentrations are low, it is not expected [hat combined effluent (at 2000:1 <br />dilution) LCD 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 discharge. <br />On this basis, we will authorize use of this chemical far the purpose requested at approximately 1:2000 <br />concentration, as indicated in your letter. No additional permit conditions aze 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 Kubrc <br />Environmental Protection Specialist <br />Permits and Enforcement Section <br />WATER QUALITY CONTROL DIVISION <br />xc: Kathleen Sullivan, Permits and Enforcement Section, WQCD <br />!im Chubrilo, Field Suppon Section, WQCD <br />Jlarry Routten, CO Division of Minerals and Geology <br />Technical Enforcement Program, EPA <br />local Health Depanment <br />