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C*% <br />, loj� reoo <br />*4,0,0 �00 ��� <br />0 <br />XBOW MINING, LLC <br />1737 HNNy 113 P.O. Box 535 Somerset. Colorado 81434 USA '1'cl (970)929 -5122 Fax <br />(970)929 -5177 <br />August 13, 2013 <br />Ms. Tania Watson <br />Colorado Department of Health, WQCD <br />Permits and Enforcement Section <br />WQCD -PE -B2 <br />4300 Cherry Creek Drive South <br />Denver, CO 80246 -1530 <br />RECEIVED <br />AUG 16 2013 <br />DIVISION OF RECLAMATION <br />MINING AND SAFETY <br />Re: CDPS Permit No. CO0000132 July 2013 Discharge Monitoring Reports, Oxbow Mining, LLC <br />Elk Creek Mine. <br />Dear Ms. Watson: <br />Enclosed are corrected July 2013 Discharge Monitoring Reports (DMR's) for Outfalls 012A and 016A <br />for the Oxbow Mining, LLC. Elk Creek Mine. The previous two DMRs were submitted on August 8, <br />2013 and are corrected by today's submittal. Oxbow regrets any inconvenience caused by this error. <br />Due to inflows from an intensive rainfall precipitation event occurring from July 27, through 28, 2013, <br />the enclosed DMRs indicate a discharge on 07/29/2013 from Outfall 012 that exceeded a primary effluent <br />limitation. Attached is a rainfall summary table from our neighbor Mountain Coal Company, West Elk <br />Mine, and Laboratory Analysis Reports from SGS Minerals Services Division for the outfall in <br />question. <br />The Division should be aware that the mine's sedimentation ponds are designed in accordance with <br />Regulations of the Colorado Division of Reclamation, Mining and Safety to contain or treat a 10 yr, 24 -hr <br />storm event of 1.9" of rainfall or snowmelt equivalent. The rainfall information indicates that a combined <br />3.1 " of precipitation in the form of intense thunderstorms occurred in the region during the two days <br />prior to the July 29, 2013 discharge sampling of the resultant sediment pond discharges. The storms may <br />have, in fact, exceeded the 100 yr- 24 hr storm event. <br />In accordance with the January 25, 2006 Permit Amendment No. 3 and May 16, 2005 Amendment #2, <br />and October 28, 2004 Amended Permit, Permit Part I(b) Alternate Limitations for Outfall 012, we are <br />requesting relief of primary total suspended solids (TSS) limitations for an event less than or equal to the <br />I0 -year, 24 hour precipitation event or snowmelt equivalent. <br />These sedimentation ponds treated the runoff in accordance with the permitted and approved designs and <br />the resulting discharges represent little more than the routine and anticipated discharge of such <br />stormwater events. <br />• Page 1 <br />