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�2EIWF CA <br />Coal Company <br />Seneca Coal Company <br />January 10, 2014 <br />RECEIVED <br />Colorado Department of Public Health and Environment <br />JAN 2 2014 <br />WQCD -PE -B2 <br />4300 Cherry eek Drive South Division n Reclamation, <br />ri'Y Mining &Safety <br />Denver, CO 80246 -1530 <br />RE: Revised Quarterly Discharge Monitoring Report for Seneca Coal Company, Permit CO- <br />0000221 <br />Dear Sir or Madam: <br />Under a cover letter dated July 24, 2013, Seneca Coal Company (Seneca) submitted the second quarter <br />2013 discharge monitoring reports (DMR). On January 9, 2014, during preparation of the Annual <br />Hydrology Report for the Seneca II -W CDRMS mining permit, we discovered that the total recoverable <br />iron (TR Fe) values reported on the DMRs for Outfall 017 were incorrect. The values reported were 285 <br />ug/l (30DA AVG) and 450 ug/l (DAILY MAX). The correct values should be 835 ug/l (30DA AVG) and <br />1500 ug/1(DAILY MAX). Because the DMR limits for the 30DAY AVG is 1000 ug/l, and "Req. Mon" <br />for the DAILY MAX, the corrected values do not result in an excursion for the TR Fe limits at Outfall <br />017. <br />The corrected 30DA AVG differs from the corrected DAILY MAX because there were two TR Fe <br />samples collected in April 2013 at Outfall 017. The first TR Fe on April 18th was 170 ug/l, and the second <br />TR Fe on April 30th was 1500 ug/l. The April 30th sample was collected as part of a selenium study that <br />Seneca conducted during 2013 that included TR Fe as one of several water quality parameters analyzed in <br />samples collected during the spring snowmelt. <br />The enclosed DMRs for Outfall 017 provide the corrected TR Fe values for the second quarter of 2013. <br />The values for all other parameters on the Outfall 017 DMRs remain the same as reported in July of 2013. <br />Please don't hesitate to contact me at 928 - 913 -9218 or via email at jcochran@peabodyenergy.com if you <br />have any questions. <br />J acer ly, <br />Cochran <br />body Energy <br />3001 W. Shamrell Blvd., Suite 110 <br />Flagstaff, AZ 86001 <br />Seneca Coal Company • P.O. Box 670 • Hayden, Colorado 81639 <br />Telephone (970) 276 -5209 • FAX (970) 276 -5222 <br />