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<br />C c~~us <br />"`~ Yampa Valley <br />Cyprus Yampa Valley Coal Corporation <br />29587 Routt County Road #27 <br />Oak Creek, Colorado 80467 <br />303-879-3800 <br />26 March 1996 <br />Ms. Kathleen Sullivan <br />Colorado Department of Health <br />Water Quality Control Division <br />4300 Cherry Creek Drive South <br />Denver, CO 80222-1530 <br />Permits & Enforcement <br />RE: NPDES Permit No. CO-0027154: February 1996 DMR Submittal <br />Dear Ms. Sullivan: <br />Please find enclosed the February 1996 Discharge Monitoring Reports (DMRs) for Permit No.CO-0027154. Three <br />exceedences are reported for the period. The 30-day average and daily maximum total suspended solids (TSS) <br />limitations for Outfall 005 were exceeded along with the 30-day average total recoverable iron (TRFe)limitation. <br />All three Outfall 005 exceedences are attributable to a waterline break which occurred on February 19, 1996. This <br />break temporarily caused additional sediment to be transported to the sampling point for Outfall 005 and resulted in <br />a collected sample exhibiting extremely high TSS and TRFe values. These values exceeded the daily maximum <br />limitations and raised the monthly average levels as reported. <br />Cyprus Yampa Valley Coal Corporation (CYVCC) believes this situation meets the definition of an upset as <br />described in the permit, and had this situatiuon not occurred, compliance would have been maintained at the ou[fall <br />throughout the reporting period. However, CYVCC failed to meet the noncompliance notification requirements <br />necessary to claim an upset condition az the realization of the waterline break's contribution to [he exceeded levels <br />occurred more than 24-hours after CYVCC became aware of the noncompliance and CYVCCwas therefore unable <br />to meet the specified reporting time frames required by the permit in order to claim an upset. In the alternative, <br />exceedences are reported based upon the values obtained using the sample azsociated with the waterline break. <br />CYVCC remedied the problem immediately upon becoming aware of the break and compliance was reestablished at <br />this ou[fall as documented by a sample collected on March 4, 1996. <br />Alternative limitations are claimed for Pond B. Outfall 003A for a reported 30-day average and daily maximum TSS <br />result of 202 mg/I. The 30-day average and daily maximum SS result of 0.5 mg/I is reported and within permit <br />limitations. Rainfall less than the 10-year, 24-hour precipitation event was recorded at USGS station 09243900 for <br />February 19 and 20, 1996 as indicated in the following [able. The sample was collected for Ou[fall 003A on <br />February 20, 1996. During an inspection by Mr. Ken[ Gorham, Environmental Protection Specialist, Colorado <br />Division of Minerals & Geology on February 20 through February 22, Mr. Gorham noted moisture in the form of <br />occasional wet snow and light rain to the area and melting of the January snowpack due to temperatures above <br />freezing during the day. <br />Date Rainfall Accumulated (inched <br />2/ 17/96 0.00 <br />2/ 18/96 0.00 <br />2/ 19/96 0.07 <br />2/20/96 0.01 <br />2/2 I /96 0.00 <br />2/22/96 0.00 <br />2/23/96 0.03 <br />2/24/96 0.00 <br />2/25/96 0.06 <br />