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<br />III IIIIIIIIIIIII III <br />C c~RUs <br />'~ Yampa Valley <br />Cyprus Yampa Valley Coal Corporation <br />29587 Routt County Road a27 <br />Oak Creek, Colorado 80467 <br />303-879-3800 <br />September 2, 1993 <br /> <br />Ms. Katherine Kalamen <br />Colorado Department of Health CEP ~19g~ <br />Water Quality Control Division <br />Attention: Permits and Enforcement D'y"'on0l~l'Aner~; <br />4300 Cherry Creek Drive South ~ ~ l,Ep;~9Y <br />Denver, CO. 80222-1530 <br />Dear Ms. Kalamen: <br />Re: Correction of Submitted Value. NPDES Permit CO-0027154: July <br />Discharge Monitoring Report <br />Enclosed, please find the revised wasteload allocation calculation <br />for outfall 019 under the referenced DMR. The 30 day value for <br />Manganese at this outfall was incorrectly reported as being 0.038 <br />mg/1 due to a calculation error. The correct value for the 30 day <br />average should read 0.055 mg/1 as reflected on the enclosed <br />calculation page. Please note that the corrected value is still <br />well below the compliance standard of 1.0 mg/1. CYVCC apologizes <br />for any inconvenience that this may cause, and we will attempt to <br />avoid a recurrence. <br />Your assistance in this matter is appreciated, and should you have <br />any questions, please contact me at your convenience. <br />Sincerely, <br />Marcus A. Middleton <br />Environmental Specialist <br />cc: EPA Region VIII <br />Kent Gorham, CDMG <br />