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<br />Colorado Discharge Permit System Regulations <br />CERHFICUION <br />under <br />GENERAL PERMIT FOR COAL MINING FACILITIES (SIC NO. 1222) <br />Category 07, Sub-category S, General Permits, Current fee S7801year (CRS 25-8-502) <br />Permit No. COG 8500,00 <br />Facility No. COG 850042 <br />Page la <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 />Permiam Facility 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 />Outfalls <br />O ct f? Source Treatment Lat/Long 10-Yr, 24-Hr Recen- ng Stream <br />Capacity <br />001A Surface Runoff Sedimentation 37° 14.26 / 1070 51.35 6.5 MG Carbon Junction <br />Canyon _ <br />Surface Runoff Sedimentation 37° 14.75 / 1070 51.40 Carbon Junction <br />002A 4.4 acre-feet <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 bons and Monitoring Requirements for Past Mining, Outfalls 61f1 and 002 <br /> Limitations <br />Monitoring <br />Sande <br />Parameter 30-Day 7-Day Daily Rationale Frequency' Type <br /> Avg. Avg. Max. <br /> General Permit let uiren zts ----- -- - <br />Flow, MGD <br />Report NA <br />Report <br />Discharge Evaluation Continuous / <br />In 2 <br />stantaneous Recorder / <br />2 <br />In-situ <br />PR S.U. N/A NA 6.5-9.0 Water Quality Standards 2 days/month Grab <br />Total Suspended Solids, mg/i 30 45 NA State Effluent Regulations 2 days/month Grab <br />Oil and Grease, mg/l N/A NA 10 State Effluent Regulations 2 days/month Visual 3 <br /> Imit <br />Effl ti <br />G <br />id <br /> uent <br />Federal on <br />a <br />u <br />e <br />Settleable Solids, mIA * Report NA 0.5 Federal ELG 2 days/month Grab <br /> Site specific Iamitatio <br />Total Dissolved Solids, mg/l Report NA Report Salinity Regulations Quarterly' 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 instantaneous basis. Major facilities shall monitor flow weekly, minor 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 frequency shall be weekly. <br />* Alternate Limitations may also apply. See Below. <br />ISSUED; JUNE 24 2W EFFEC M: JULY 1 2008 EXPIM: JUNE 30, 2013