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iii iuiiiiiiiiu iii <br />Colorado YamE _._ _ 999,,,..,E <br />COLORADO PAMPA 29515 Routt County Road #27 <br />~ COAL COMPANY Oak Creek, Colorado 80467 <br />A Cyprus Amax Company (970) 879-3800 <br />December 19, 1997 <br />Kent Gorham <br />Environmental Protection Specialist <br />Division of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />RE: Response to Division's Comments on 1996 AHR <br />Permit No. C-84-062 <br />Dear Mr. Gorham: <br />RECEI\/ED <br />DEC 2 3 1997 <br />DIVISICn of iNineidi5 a Ueologg <br />The following respond [o the comments presented in your letter of September 12, 1997 on the above <br />referenced AHR. The responses follow the same numbering sequence presented in yoar letter. <br />Response No. 1 -Colorado Yampa Coal Company will follow the prescribed frequency designated in its <br />permit. <br />Response No. 2 - I discussed this issue with Karl Koehler, former CYCC employee responsible for this <br />monitoring program, and was advised that the reason for the perfect match is that during [he high flow <br />period (i.e. March Uvough July) [he data for site 29 was the result of summing [he flow data for sites 700 <br />and 900. This is due to the fact that during this period of the year the gauge at site 29 is not as accurate <br />for measuring high flows, therefore the use of the method of summing the hvo upstream sites. During the <br />low flow period the gauge measurement is used as CYCC is confident in the gauge and rating curve <br />established for this site. This explains why there is discrepancy of the data during these [vvo periods. <br />Also, given the fact that the monitoring program is focused on the low season it is CYCC's opinion that <br />use of the site 29 data during low flow periods is appropriate and accurately reflects the Flow at that time. <br />Response No. 3 - No response necessary. <br />If there are further questions, please contact me a[ your convenience. <br />Sin-c~erely, <br />Richard Mills <br />Environmental Manager <br />fi Ie:I: document\cycc\m3\97ahrres <br />