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Permit No. COG-850000 <br />FaahlyNo_ COG 850042 <br />Page ]a <br />Colorado Discharge Permit System Regulations <br />CERTIFICATION <br />under <br />GENERAL PERMIT FOR COAL MINING FACILITIES (SIC NO: 1222) <br />Category 07, Sub-category5, General Permits, Current fee $7801year (CRS 25-8-502) <br />This certification specifically authorizes Oakridge Energy Inc, to discharge from the Carbon Junction Mine, <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-850042. <br />Permittee Faci[dy Contact <br />Oakridge Energy, Inc. Bryan Duff <br />4613 Jacksboro Highway 970-247-1705 <br />Wichita Falls, TX 76301 <br />Project Name, Activity and Location <br />The Carbon Junction Mine is a reclaimed surface coal mine. The discharge consists solely of surface water runoff The facility is located <br />approximately 2 miles south of Durango, CO, in Section 4, T34N, R9W, Section 33, T34'/zN, R9W and Section 33, T35N, R9W in La <br />Plata County. <br />Ou#a& <br />Oct faffs Source Treatment LailLong I0-Yr, 24-Hr Receiving Stream <br />- C?acity <br />001A Surface Runoff Sedimentation 37° 14.26 / 107° 51.35 6.5 MG Carbon Junction <br />Canon <br />002A Surface Runoff Sedimentation 37° 14.75 / 107° 51.40 4.4 acre-feet Carbon Junction <br />Effluent Parameters <br />The discharge is to Carbon Junction Canyon, within Segment 13b of the Animas and Florida River Sub-basin, San Juan and Dolores River <br />Basin, found in the Classifications and Numeric Standards for the San Juan and Dolores River Basin (Regulation No. 34; last update effective <br />07/01/07). Segment 13b is Undesignated, and is classified for the following beneficial uses- Aquatic Life, Class 2.Cold; Recreation Class E; <br />Water Supply, and Agriculture. <br />Permit Lun*&ons and Monitoring Requirements for Post Mining, Outfafls 0111 and 002 <br />Limitations <br />Parameter 30-Day 7-Day Daily Rationale Monitoring Sample <br />Avg. Avg_ Max. Frequency Type <br />General Permit Re"Wetitemts <br />Flow, MGD <br />Report NA Report Discharge Evaluation Continuous / Recorder 1 <br /> histantaneous2 In situ 2 <br />pH, S.U. N/A NA 6.5-9.0 Water Quality Standards 2 days/month Grab <br />Total Suspended Solids, mgll 30 45'' NA State Effluent Regulations 2 days/month Grab <br />Oil and Grease, mg/( N/A NA 10 State Effluent Regulations 2 daystmonth Visual a <br />Federal Etttuent Limitation Guidetinea- <br />Settleable Solids, ml/l * Report NA 0.5 Federal ELG 2 days/month Grab <br />Site Specific Imitations <br />Total Dissolved Solids, mg/t Report NA Report Salinity Regulations Quarterly 4 Grab <br />1 - For a minor facility, as determined by the EPA NPI)ES Permit Rating Worksheet, all weekly monitoring requirements shall be changed to 2 days per month <br />2 - If power is not available, flow may be. measured on an instar sous basis. Major facilities shall monitor flow weekly, mirror facilities 2 days / month <br />3 - If a visual sheen is noticed, a grab sample must be taken and analyzed for oil and grease <br />4 - Quarterly monitoring shall be prescribed if the limitation is based upon discharge to the Colorado River Basin. If the limitation is based upon agricultural protection, the <br />monitoring f requency shall be weekly- <br />* Alternate Limitations may also apply. See Below. <br />ISSUED; .24, 2008 EFFECT E; JULY i 2008 001 <br />S• JUNE 30 2013