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Permit No. COG -850000 <br />Facility No. COG -850051 <br />Page la <br />Colorado Discharge Permit System Regulations <br />CERTIFICATION <br />under <br />GENERAL PERMIT FOR COAL MINING FACILITIES (SIC NO: 1222) <br />Category 07, Sub -category 5, General Permits, Current fee $780/year (CRS 25-8-502) <br />This certification specifically authorizes Peabody — Twenty Mile Coal Company to discharge from the 6 Main North <br />Sedimentation Pond <br />as described below and in accordance with the General Permit for Coal Mining Facilities (Surface Runoff. <br />All correspondence relative to this facility should reference the specific facility number, COG -850051. <br />Permittee Facility Contact <br />Peabody — Twenty Mile Coal Company Michael Ludlow, Mine Manager <br />29515 Routt County Road #27 Phone: 970-879-3800 <br />Oak Creek, CO 80467 Email: mludlow@,peabodyenergy.com <br />Facility Contact: Brian Watterson, Environmental Geologist <br />Email: bwattersonAi?eabodyenergy.com <br />Project Name, Activity and Location <br />6- Main North (6MN) Sedimentation Pond- The facility is an active underground coal mine with related surface coal handling, storage, <br />cleaning, and shipping operations. The discharge is from the sediment pond that treats the stormwater runoff from a 13.43 acre pad <br />associated with the 6MN ventilation borehole at Foidel Creek Mine. The facility is located at 29515 Routt County Road 33 in <br />Unincorporated Routt County Colorado 80467. <br />Discharge Points <br />Outfalls Source Treatment Lat/Long 10 -Yr, 24 -Hr Receiving Water <br />Capacity <br />001A Surface Runoff Sedimentation 40023'27.66" N / 0.25 Fish Creek <br />107003'44.16" W <br />Effluent Parameters <br />The discharge is to Fish Creek, within Segment 11 of the Yampa River Sub -basin, Upper Colorado River Basin, found in the <br />Classifications and Numeric Standards for the Upper Colorado River Basin (Regulation No. 33; last update effective January 01,2009). <br />Segment 13b is Undesignated, and is classified for the following beneficial uses: Aquatic Life, Class 2 Cold; Recreation Class N; and <br />Agriculture. <br />Permit Limitations and Monitoring Requirements for Outfalls 001for Surface Runoff or Non -coal Related Waste Streams <br />Limitations Monitoring Sample <br />Parameter 30 -Day 7 -Day Daily Rationale Frequency' Type <br />Avg. Avg. Max. <br />-------------------------------------General Permit Requirements---- -------------------------- <br />Recorder / <br />In-situ 2 <br />Grab <br />Visual 3 <br />Flow, MGD <br />Report <br />NA <br />Report <br />Discharge Evaluation <br />Continuous / <br />Instantaneouss <br />pH, s.u. <br />N/A <br />NA <br />6.5-9.0 <br />Water Quality Standards <br />2 days/month <br />Oil and Grease, mg/1 <br />N/A <br />NA <br />10 <br />State Effluent Regulations <br />2 days/month <br />----------------------------------------Federal <br />Effluent Limitation Guidelines----- ------------------------------- <br />Settleable Solids, mUl <br />Report <br />NA <br />0.5 <br />Federal ELG <br />2 days/month <br />Settleable Solids, mUl* <br />Report <br />NA <br />Report <br />Federal ELG <br />2 days/month <br />---------------------------------------Site <br />Specific Limitations-------_____________ <br />----- -------------------- <br />------ <br />Total Dissolved Solids, mg/1 <br />Report <br />NA <br />Report <br />Salinity Regulations <br />Quarterly 4 <br />Grab <br />Grab <br />Grab <br />ISSUED JANUARY 25 2010 EFFECTIVE: FEBRUARY 1, 2010 EXPIRATION: JUNE 30, 2013 <br />