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III IIIIIIIIIIIII III <br />999 <br />C c~~us <br />~z Yampa Valley <br />Cyprus Yampa Valley Coal Corporation <br />29587 Routt County Road #27 <br />Oak Creek, Colorado 80467 <br />30379-3800 <br />July 26, 1993 <br />LjF,^,~Il; ter'. <br />~iUL 3 a 1993 <br />Ms. Pat Nelson <br />Colorado Department of Health <br />Water Quality Control Division <br />Attention: Permits and Enforcement <br />4300 Cherry Creek Drive South <br />Denver, CO. 8022 2-1 5 30CDOH <br />Diws~,o: ~ ~» ~~~~~ ~:,, ~........... <br />RE: Submittal of Corrected Materials. Permit CO-0027154. Cvorus Yamoa Vallev <br />Coal Coro. <br />Dear Ms. Nelson: <br />Enclosed, please find the revised Wasteload allocation data pertaining to outfalls 001, <br />005, 007, and 019. In reviewing the data submitted in the May DMR, it was noted <br />that there were some discrepancies in the flow values for outfall 001. Upon further <br />study, it was determined that the incorrect flow level had been taken from the field <br />book on 5/3/93 thus giving an incorrect flow volume, while the values from 5/17/93 <br />and 5/24/93 obtained from the rating curve were off by one line, thus yielding slightly <br />lower numbers. In keeping with the requirements of our permit, CYVCC is submitting <br />the revised calculations which are affected by this correction, As can be seen from the <br />revised calculations included with this letter, there was no significant difference in <br />loading values, with the primary correction being associated with the 30 Day Average <br />and Daily Maximum flow values reported for outfall 001. <br />I sincerely apologize for any inconvenience that this may cause. <br />Sincerely, <br />Marcus A. Middleton <br />Environmental Specialist <br />Attachment <br />cc: EPA <br />Kent Gorham. MLRD <br />