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STATE OF COLORADO <br />COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT <br />WATER QUALITY CONTROL DIVISION <br />TELEPHONE: (303) 692-3500 <br />CERTIFICATION TO DISCHARGE <br />UNDER <br />CDPS GENERAL PERMIT COG070000 <br />CONSTRUCTION DEWATERING OPERATIONS <br />Certification Number: COG073534 <br />This Certification to Discharge specifically authorizes: <br />Twentymile Coal LLC <br />to discharge from the facility identified as <br />Foidel Creek Mine <br />to: <br />Foidel Creek <br />*All <br />other <br />Facility Location Latitude 40.3875, Longitude -100.345833 <br />Discharge Number 001-A This dewatering discharges to Foidel Creek near the underground coal mine facility <br />External Outfall entrance. The estimated flow rate is 3 cfs. <br />Facility Located at: 29515 County Road 27, Routt County, Oak Creek, CO 80467 <br />lischarges must comply with the lawful requirements ortkdcnd agencies municipalities, counties, drainage districts and other local agencies regarding any discharges to storm drain systems, <br /> comeyanoes, or <br />water courses under their jurisdiction. <br />Permit Limitations and Monitoring Requirements apply to 001A as outlined in the Permit Part LB and Part LC <br /> Discharge Limitations <br />P <br />t maximum concentrations MonRnring <br />arame <br />er U <br />it 30-Da 7-Da u Sample Type <br /> n <br />s y <br />I <br />y <br />Dally Max. <br />Freq <br />ency <br /> Average Average <br />APPLICABLE TO ALL DISCHARGES AS LISTED IN GENERAL PERMIT <br />pH, (Minimum-Maximum) S.U. <br /> <br />00400 NA NA 6.5-9.0 Weekly In-situ <br />Total Suspended Solids, mg/I <br /> 30 45 NA Weekly Grab <br />00530 <br />Oil and Grease, mg/I NA NA 10• Weekly Grab* <br />3582 <br />Flow, MGD Instantaneous or <br /> Report NA Report Weekly <br />50050 Continuous <br />Oil and Grease Visual <br /> NA NA NA Weekly Visual <br />84066 <br />• Ora visible sheen is observed, a grab sample shall be collected and analysed for oil and grease. <br />Certification is issued 10/20/2010 Effective 10/20/2010 Certification Expires: 11/30/2011 <br />This certification under the permit requires that specific actions be performed at designated times. The certification holder is <br />legally obligated to comply with all terms and conditions of the permit. <br />Signed, <br />Nathan Moore <br />Construction, MS4, & Pretreatment Unit Manager <br />Water Quality Control Division <br />Paee 1 of 15