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Fifal CLIMAX MOLYBDENUM COMPANY <br />A Subsidiary el Phelps Dodge Cerporumn <br />RECE, .'ED <br />APR 15 2002 <br />Ditfklaa of MiattresandN o l an <br />April 11, 2002 <br />Mr. Allen Sorenson <br />Environmental Protection Specialist <br />Colorado Division of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 l! <br />RE: Relocation of Discharge, 3 -Dam Seepwater Management, Henderson Mill, Technical <br />Revision TR - 09, Permit No. M -77 -342/ <br />Dear Allen: <br />This letter is being provided to inform the Division of Minerals and Geology (Division) of a <br />proposed relocation of the 3 -Dam seepwater line discharge. Please find enclosed one set of <br />drawings detailing the proposed relocation. <br />Henderson would like to relocate the pipe discharge in order to move the accumulation point of <br />the metal oxide precipitation (sludge) that is currently taking place at the 3 -Dam seepwater line <br />discharge. The lines currently discharge just upstream of the the Park Station seepwater inlet. <br />The low pH, high metal content 3 -Dam seepwater, when discharged into the more neutral pH <br />water of the 1 -Dam seepwater canal, precipitates metal oxides. At this location it is difficult to <br />clean the sludge out of the inlet works and causes premature scaling and build up in our pumps <br />and pipelines. By relocating the discharge to the head end of the 1 -Dam seepwater canal, we will <br />increase the detention time of the 3 - Dam seepwater in the canal allowing precipitation to take <br />place away from our pump station and in a location that is easier to clean. The 3 -Dam seepwater <br />will, of course, still be reporting to the same location for recycling into the mill water circuit. <br />Henderson would like to begin construction on this project in May 2002. <br />Please call if you have any questions or are in need of any further information before granting <br />approval for this change. I can be reached at (303) 569 -3221 ext. 2214. <br />Very truly yours, <br />Erich Bower <br />Sr. Environmental Engineer <br />Climax Molybdenum Company <br />Enclosure <br />Cc: Mike Ley — Climax <br />Rich Wagner - Climax <br />HamosnsoN OPERATIONS <br />18302 County Road 3 <br />Parallel], Colorado 80469 <br />CO3) 3 569.3221 <br />Fax 197W 725.0039 <br />