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III I II I II I II IIII III Y <br /> Cy COLORADO OPERATIONS <br /> © CLIMAX MOLYBDE 9 <br /> A Dwision of Cyprus Climax Metals Co Climax Mine <br /> Hwy.91 <br /> G� �7 -7 4-1 Climax,Colorado 80249 <br /> (719)486-2150 <br /> ^ ( ` ` f`7 yq3 Fax-(719)486-22511 <br /> May 13, 1999 <br /> Mr. Allen Sorenson 7D <br /> Division of Minerals and Geology 4-11 <br /> 1313 Sherman Street, Room 215 MAY `1 1999 <br /> Denver, CO 80203 <br /> Division of Minerals&lueology k,"" <br /> Dear Mr. Sorenson: <br /> Enclosed please find the results of analyses conducted at the outlet works of Eagle Park <br /> Reservoir during the 1998/ 1999 water delivery period. You will note from these analytical <br /> results that there were no water quality standards exceedences. In fact, the water quality <br /> delivered from the reclaimed reservoir was excellent. <br /> In order to compare data in the final report that is due in three years, Climax Molybdenum <br /> Company (CMC) agreed to perform water quality monitoring upstream and downstream of the <br /> location where waters from Eagle Park entered the East Fork of the Eagle River. The results of <br /> these data are also attached. These data show that analyses performed in December T998 and <br /> February 1999 at the point below the confluence contained total recoverable iron levels above the <br /> in-stream standard of 1.0 mg/1. Concurrent sampling at the reservoir outlet works showed iron <br /> concentrations of 0.08 mgAand 0.06 mg/I respectively, which were well below the in-stream <br /> standard. Therefore, there is no basis to believe that the iron concentrations observed in the East <br /> Fork of the Eagle River were related to the reservoir facilities. <br /> During detailed review of this information, CMC noted that the same sampling periods showed <br /> relatively high total suspended solids below the confluence of Eagle Park waters and the East <br /> Fork. CMC believes that physical scour of the native/natural channel below the flume house <br /> resulted in increased turbidity and suspended iron-bearing geologic materials. Introduction of a <br /> surface water flow to this channel in winter conditions appears to have been the causal factor. <br /> Based on the fact that this channel has not seen winter flows since the construction of No. 4-Dam <br /> (1964), CMC believes that temporary scour will occur during water delivery activities until the <br /> channel has seasoned. <br /> If you have any questions please contact me at(719)486-2150,ext. 723. <br /> Sincerely, <br /> Bryce Romig <br /> Climax Molybdenum Company <br /> cc: P. Hegeman—CDPHE, WQCD <br /> J. Jones—Cyprus Climax Metals Company <br /> J. Danni—Cyprus Climax Metals Company <br /> J. Cupp—Climax Mine <br /> J. Raisch -Vranesh & Raisch <br />