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Total Suspended <br />Solids, mg/I <br />Report <br />NA <br />Report <br />Federal ELG <br />Weekly <br />Grab <br />Total Iron, mg/1 <br />Existing Sources <br />(before 5/4/84) <br />New Sources (after <br />5/4/84) <br />Report <br />Report <br />NA <br />NA <br />Report <br />Report <br />Federal ELG <br />Weekly <br />Grab <br />Parameter <br />ALTERNATE LIMITATIONS FOR ALKALINE MINE DRAINAGE AND <br />COAL PREPARATION AND ASSOCIATED AREAS <br />Any discharge or increase in the volume of a discharge from an above ground alkaline mine (or an underground alkaline mine <br />where the effluent is commingled with other categorical wastewater prior to discharge), caused by precipitation within any 24- <br />hour period less than or equal to the 10 -year, 24 -hour precipitation event (or snowmelt of equivalent volume) may substitute <br />the following limitations for these specific parameters only, subject to burden of proof requirements described in Part I.B.6.. <br />Other Conditions <br />Limitations <br />3Q Day 7 -Day Daily _ Rationale <br />Avg. Avg. <br />Max, <br />Permit No. COG - 850000 <br />Facility No. COG - 850062 <br />Page 1 b <br />Monitoring , Sample <br />Frequency' Type <br />Antidegradation <br />Antidegradation review does not apply to this permit because limitations based on Water Quality Standards are not applied in this <br />certification. <br />Groundwater Contamination <br />If groundwater contamination is encountered, then the permittee is to contact the Division, cease all discharges, and if appropriate, <br />contact the owner of the collection system receiving the discharge. Since the discharge of contaminated groundwater is not <br />covered under this permit, the permittee shall immediately apply for a groundwater remediation certification, which will include <br />appropriate requirements for additional discharge monitoring and on -site environmental response capabilities. <br />Sampling <br />Sampling shall occur at a point after treatment, or after the implementation of any Best Management Practices (BMPs). If BMPs or <br />treatment are not implemented, sampling shall occur where the discharge leaves control of the permittee, and prior to entering the <br />receiving stream or prior to discharge to land. Samples must be representative of what is entering the receiving stream. <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; riprap; 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 />Maura McGovern <br />303 - 692 -3392 <br />5 /6/11 <br />