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• <br />TR9PPER 1~ININR INC. <br />• III IIIIIIIIIIIII III <br />CERTIFIED #P568142120 <br />Ms. Sandi Marek <br />Water Quality Control Division <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 />~ ~ p 1 1 1989 <br />RLIi` ~(A r~ ~ ~~ll r <br />Q .~!~J 7..I(~~~ <br />As reported to You by phone on September 5, 1989, Trapper Mine measured a pH <br />value of 9.4 at NPDES point 005 (Coyote Dam). Tire 9.4 pli value exceeded our <br />current effluent limitation [o discharge under the Colorado Discharge Permit <br />System. The elevated pll reading is a result of low water flows combined with <br />high summertime temperatures causing significant algae growth to develop in <br />the sediment pond. To eliminate further discharge from this location, the <br />decant (principal spillway) associated with Coyote Dane vas closed. Additional <br />pll samples of pond water were taken on 9/6/89 and resulted in values of 8.7 <br />and 8.8. <br />Further dewacering of Brassile-Simms pit pond should increase tl~e oxygen <br />supply in Coyote pond and aid in lowering pH levels. If dewatering does no[ <br />result in decreased pH values, a carbon dioxide bubbler will be installed at <br />the discharge point. <br />Sandi, if you have any questions, please call. <br />WA/jb <br />~CDOH\SEPT07] <br />G.M. Stubblefield <br />R.W. Fish <br />Fre -~ CMLRD <br />File .2.7.3 <br />J.M. Mattern <br />U.S. EPA <br />Bi11 Robb, WDE6T <br />September 7, 1489 <br />~~~~ ~ ~~~ <br />Sincerely, <br />~e/~/ <br />''Z2l(u ail (~3(lic.~- <br />William Agnew <br />Sr. Enviroiunental Engineer <br />I certify under penally of law that I Dave examined and am <br />familiar with the information submitted in this correspondence and <br />that, based on my inquiry of those persons imniediaCely responsible <br />for ob[ainiug the information contained in [he correspondence, I <br />believe the information is [rue, accurate and complete. I am <br />aware there are significant penalties Eor submitting false <br />information, including the possibility of fine and imprisonment <br />„.. // <br />G.M. Stubb efield /• <br />Vice President/Op rations <br />P.o. ao. la7 r,~,~~ C~~~u3do ~ISZb f303! o~~a a 1~1 <br />