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<br />TR9PPER DINING ING. <br />999 <br />September 25, 1989 <br />CERTIFIED #P566142113 <br />Ms. Sandi Marek <br />Water Quality Control Dlvision <br />Colorado Dept. of Health <br />4210 East 11th Ave. <br />Denver, CO 80220 <br />Dear Sandi: <br />Subject: Colorado Wastewater Discharge Permit CO-0032115 <br />~6 ~ ~ "u ,tl~pJ 6 ~ I: R" i; ll <br />~. ~ 'N~: j. ~, P ilav Y+G <br />;!_p ~ g 1989 <br />N:IN~U Lf;I~IU <br />i~E~LAAAP.T!ON pf'JI8{On <br />As reported to you by phone on September 20, 1989, Trapper Mine measured a pH <br />value of 9.2 at NPDES point 005 (Coyote Dam). The 9.2 pH value exceeded our <br />current effluent limitation to discharge under the Colorado Discharge Permit <br />System. The elevated pH reading is a result of significant algae growth in <br />the sediment pond. To eliminate further discharge from this location, the <br />decant (principal spillway) associated with Coyote Dam was closed. However, <br />we continue to de-water periodically from Brassile-Simms pit which may result <br />in additional discharge from Coyote, If de-watering does not result in <br />decreased pH values and a carbon dioxide bubbler cannot be used effectively to <br />lower the pH, an effort will be made to retain discharge waters until algae <br />blooming ceases. <br />Sandi, this continues to be a yearly (seasonal) problem. If some resolution <br />were incorporated into our permit allowing >9 pH values or the use of an <br />acceptable algaecide or biological control (e.g. introduction of grass carp), <br />the issue could be resolved. Please call if you have any questions. <br />Sincerely, <br />~~CLLf<!1f ~L~ <br />William Agnew <br />Sr. Environmental Engineer <br />WA/jb <br />]CDOH\SEP25] <br />G.M. Stubblefield <br />R.W. Fish ~_~ <br />Fred Banta, CM <br />File 109.2.7. <br />J.M. Mattern <br />U.S. EPA <br />Bill Robb. WDB6T <br />I certify under penalty of law that I have examined and am <br />familiar with the information submitted in this correspondence and <br />that, based on my inquiry of those persons immediately responsible <br />for obtaining the information contained in the correspondence, I <br />believe the information is true, accurate and complete. I am <br />aware there are significant penalties for submitting false <br />information, including the possibility of fine and imprisonment. <br />~~_ ~ ,~ . <br />G.M. Stub lefield <br />Vice President/Operations <br />P.O. Box 187 Craig, Colorado 81626 (303) 824-4101 <br />