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Mr. David Gay, President <br />April 27, 2001 <br />Page 2 of 2 <br />6. The manufacturer or supplier of the pH standards should be contacted to determine the <br />shelf fife of the dry chemical and standard solutions after they have been mixed. <br />[f you have any questions, please contact us at the phone numbers below. <br />Sincerely, <br />Robert Cribbs <br />Environmental Protection Specialist I <br />Water Quality Control Division <br />(970)248-7199 <br />~~ ~~ <br />Bryan Fiynt <br />Engineering Technician I <br />Water Quality Control Division <br />(970)248-7154 <br />CC: Ms.Tanya Hammond, Owners Representative, Powderhotn Coa( Company, <br />P.O. Box 1430, Palisade, CO 81526 <br />Steve Defeyter, Mesa County Health Department <br />i-Inspector, Colorado Division of Minerals and Geology, Denver <br />Betsy Beaver, Operator Certification, WQCD <br />Dwain Watson, D.E., Technical Service Unit, WQCD <br />Leslie Simpson, Compliance Monitoring and Data management, WQCD <br />Susan Nachtrieb, Permits Unit Mnager, WQCD (attention: permit corrections and <br />proposed new dischazge point) <br />Mike Liuzzi, Permits Unit, WQCD <br />File <br />R.Cribbs, WQCD <br />B. Flynt, WQCD <br />