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<br />TRgPPER EIINING INC. "' ""~99"""" <br />~fvt- <br />]one 10,1991 JUN 1 ? 14q r <br />CERTIFIED ~P175046702 P~ Mined Laney <br />Ms. Ann Ihlenfeldt y ~ ciamat1pn ~ivisi°n <br />Water Quality Control Division 3~ (-~ <br />Colorado Department of Health ~f~(~ <br />4210 East 11th Ave. <br />Denver, CO 80220-3716 <br />Dear Ann: <br />As reported to you by telephone oa June 7,1991, Trapper measured a pH value of 9.2 at NPDES point 001 <br />(lohnson Gulch) the afternoon of June b. 1991. The 9.2 pH value exceeded our torten[ effluent limitation <br />[o discharge under the Colorado Discharge Permit System. Tde elevated pH reading is a result o[signifipat <br />algae growth in the sediment pond. To eliminate further discharge from this logtion (temporary), the <br />decant associated with the principal spillway pipe was blocked. <br />In recent years, Trapper has experienced significant algae growth in sevtral sedimentation ponds resulting in <br />higher than acceptable pH values. [n an effort to eliminate future pH problems in ponds, Trapper requests <br />the Division approve the use of Aquazine algicide. This algicide is currently used throughout the country <br />and was recommended for use by both the Colorado Division of Wildlife and Steve Flickinger, Fisheries <br />Biologist at Colorado State University. <br />Enclosed is an information sheet, Material Safety Data Sheet, and letter o[ recommendation (Steve <br />Flickinger) far Aquazine. If you have any wncerns about our use of this pesticide, please contact me as we <br />hope to apply (3-31/ItY per acre fi water storage) as soon as passible. I would appreciate your expeditious <br />response on this [natter. <br />Sincerer <br />William Agnew <br />Sr. Environmental Engineer <br />WAIb <br />[CDOHWNI0] <br />Enclosure <br />J.M. Mattern R.W. Fish <br />W.S. Harding B.D. <br />US E.P.A la Routten MLRD <br />File ]09.2.7.3 <br />I certify under penalty of law that I have examined and am familiar with the information submitted in this <br />correspondence and that, based on my inquiry of those persons immediately responsible for obtaining the <br />information contained in the correspondence, Ibelieve tde information is true, accurate and complete. 1 <br />am aware there are significant penalties for submitting false information, including the possibility of fine <br />and imprisonment. <br />.f*f. ~ - <br />G.M.Stubblefi d <br />Vice PresidenUOperations <br />P.O. Box 187 Craig, Colorado 81626 (303) 824-4401 <br />