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Permit No. COG-850000 <br />Facility No. 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-category 5, 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 <br />Oak ridge Energy, Inc. <br />4613 Jacksboro Highway <br />Wichita Falls, TX 76301 <br />Facility Contact <br />Bryan Duff <br />970-247-1705 <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 <br />located approximately 2 miles south of Durango, CO, in Section 4, T34N, R9W, Section 33, T34'/2N, R9W and Section 33, T35N, <br />R9W in La Plata County. <br />Outfalls <br />Outfalls Source Treatment; Lat/Long 10-Yr,'24-Hr" Receiving Stream <br />Capacity <br />Surface Runoff Sedimentation 37° 14.26 / 107° 51.35 Carbon Junction i <br />6.5 MG Canyon ! <br />OOlA <br />Surface Runoff Sedimentation 37° 14.75 / 107° 51.40 Carbon Junction ! <br />4.4 acre-feet Canyon <br />002A <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 <br />effective 07/01/07). Segment 13b is Undesignated, and is classified for the following beneficial uses: Aquatic Life, Class 2 Cold; <br />Recreation Class E; Water Supply; and Agriculture. <br />Permit Limitations and Monitoring Requirements for Post Mining, Outfalls 001 and 002 <br />_ I imitations Monitoring Sample <br />Parameter 30-Day 7-Day Daily Rationale <br />- <br />Frequency Type <br />Avu. Av-. . Max. <br />General Permit Requirements <br />d <br />/ <br />R <br />Flow, MGD Report NA Report Discharge Evaluation ecor <br />zer <br />Continuous / z <br />Instantaneous In sltu <br />1 <br />s.u. N/A NA 6.5-9.0 Water Quality Standards <br />pH 2 days/month Grab <br />, <br />Total Suspended Solids, mg/1 30 45 NA State Effluent Regulations 2 days/month Grab <br />' <br />Oil and Grease, mg/1 N/A NA 10 State Effluent Regulations 2 days/month Visual <br />Federal Effluent Limitation Guidelines <br />Settleable Solids, mV1 * Report NA 0.5 Federal ELG 2 days/month Grab <br />Site Specific Limitations <br />Total Dissolved Solids, mg/l Report NA Report Salinity Regulations Quarterly ° Grab <br />all weekly monitoring requirements shall be changed to 2 days per month- <br />Worksheet <br />EPA NPDES Permit Ratin <br />th <br />d b <br />i <br />, <br />g <br />e <br />ne <br />y <br />1- For a minor facility, as determ <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, <br />the monitoring frequency shall be weekly. <br />* Alternate Limitations may also apply. See Below.