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~~~~~~~~~~~~~~~~~~~ Npc~~a~7~ <br />51Ai9~ Ur COLORADO <br />Roy Romer, Governor <br />Patti Shwayder, Acting E+eecrnive Director <br />l7edicated to protecting and improving the health and environment o/the people of Colorado <br />4300 Cherry Creek Dr. ti. Laboratory Building <br />Denver, Colorado 80222-1570 4210 E. 11th Avenue <br />Phone (303) 692-2000 Denver, Colorado 80220-3716 <br />(303) 691-4700 <br />Water Quality Control Division <br />WQCD-PE-B2 <br />(303}t692-3500 FAx (303)+7g2-0390 <br />July 12, 1995 <br />Tim Chervick <br />Environmental Coordinator <br />Western Fuels-Utah, Inc. <br />P.O. Box 1067 <br />Rangely, CO 81648 <br />RE: Chemical Approval <br />Western Fuels-Utah, Inc. - Deserado Mine <br />CDPS No. CO-0038024 <br />Rio Blanco County <br />Dear Mr. Chervick: <br />RE~E~vEo <br />JUG 211995 <br />Division p/ Mmeid1S ~ Gep p9Y <br />p4'CO <br />e~ <br />r ~~ <br />~ /a r6 ~ <br />Colorado Department <br />oFPublicHealth <br />and Environment <br />Your April 25, 1995, letter to Kathleen Kalamen included a request approval to use Nalco 9805 for additional <br />chemical treatment at the Deserado Mine. This request was forwarded to me for review. I apologi2:e for the <br />delay in my being able to review your request. <br />Your letter is accompanied by a report from Nalco indicating that optimum treatment occurs with addition of <br />2 ppm of Nalco 9806 (plus 20 ppm of Nalco 7888). Also included is the Material Safety Data Sheet (MSDS) <br />for 9806, which indicates that the chemical is essentially non-toxic to slightly toxic to aquatic life with the <br />static 48-hour acute LC,o for daphnia of 280 mg1P -well above the recommended dosage of 2 ppm. Toxicity <br />levels for other species are even higher. <br />On this basis, we approve use of this chemical at the recommended dosage level. <br />Please contact me at (303)+692-3605 if you have questions. <br />Since <br />Jon C. Kubic <br />Environmental Protection Specialist <br />Permits and Enforcement Section <br />WATER QUALITY CONTROL DIVISION <br />xc: Jim Chubrilo, Field Support Section, WQCD <br />Colorado Division of Minerals & Geology, Coal Section <br />Permits Section, EPA <br />focal Health Uepanment <br />