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Permit No. COG-850000 <br />Facility No. COG-850048 <br />Page I b <br />Permit Limitations and Monitoring Requirements - Outfall 001A <br /> Limitations <br />Parameter 30-Day 7-Day Daily Rationale Monitoring Sample <br /> <br />Avg. <br />Avg. Max. Frequency Type <br />----------------------------------------------General Permit Requirements------------------------------------ -------------- <br />Flow, MGD Report NA Report Discharge Evaluation 2 days/month In-situ <br />pH, s.u. N/A NA 6.5-9.0 Water Quality Standards 2 days/month Grab <br />Oil and Grease, mg/I N/A NA 10 State Effluent Regulations 2 days/month Visual' <br />------------------------------------------ Federal Effluent Limitation Guidel ines----------------------------- ---------------- <br />Total Suspended Solids, mg/1 35 NA 70 Federal ELG 2 days/month Grab <br />Settleable Solids, mUl Report NA 0.5 Federal ELG 2 days/month Grab <br />--------------------------------------------------Site Specific Limitations---------------------------------------- -------------- <br />Total Dissolved Solids, mg/1 * Report NA Report Salinity Regulations Quarterly 4 Grab <br />Total Recoverable Iron, ug/I 1000 NA NA Water Quality Standards 2 days/month Grab <br />Whole Effluent Toxicity (WET) <br />Acute LC50 > 100% State Permit Limitations Quarterly Grab <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 />Monitoring and Reporting <br />Discharge Monitoring Reports (DMR) must be submitted quarterly as long as the certification is in effect. The permittee shall provide <br />the Division with any additional monitoring data on the permitted discharge collected for entities other than the Division. This will be <br />supplied to the Division within 48 hours of the receipt of the data by the permittee. <br />Best Management Practices <br />The permittee shall implement and maintain the Best Management Practices (BMP) for the prevention of erosion and the control of <br />solid and liquid pollutants due to the discharge. BMPs include various options, such as: modification of the pipe discharge structure to <br />disperse flows; containment of water by hay bales or other comparable structures; the use of geocloth, filter fabric, or plastic sheeting <br />for protection of containment structures; rip-rap; and/or any other approved methods. <br />The General Permit for Coal Mining is attached and the permittee should review this permit for familiarity with all of the permit <br />requirements. If the permittee has questions related to this certification that cannot be answered by a review of the permit, the permit <br />writer should be contacted. <br />Permit Writer <br />Andrew Neuhart <br />303-692-3655 <br />8/28108