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RECEIVED JUL 0 12098 <br />Permit No. co"50" <br />Facility No. COG- 850001 <br />Page 1b <br />ALTERNATE LIMITATIONS FOR ALKALINE MINE DRAINAGE AND COAL PREPARATION AREAS <br />ny discharge or increase in the volume of a discharge from an above glOUnd alkaline mine (or an underground alkaline mine where <br />.,e effluent is commingled with other categorical wastewater prior to discharge), caused by precipitation within any 24 -hour period <br />less dan M 0a1 to th 10 -vest 24ho1}I.indpitafim event (or snowmelt of equivalent volume) my substitute the following <br />limitations for these specific parameters only, subject to burden of proof requirements described in Part I.B.6. <br />Federal EMuent Limttanon utunennes <br />Total Suspended Solids, mg/l Report NA Report Federal ELG Weekly Grab <br />Any discharge or increase in the volume of a discharge from an $dove g alkaline mine (or an underground alkaline mine where <br />the effluent is commingled with other categorical wastewater prior to discharge), caused by precipitation within any 24 -hour period <br />yeater dw the 10 -veer, 24-hour oreciuitigm event (or snowmelt of equivalent volume) My substitute the following limitations for <br />rh~ cnecific parameters oniv. subject to burden of proof requirements described in Part LB.6. <br />Federal ESlnent Llmttanon UWa <br />Total Suspended Solids, mg/i Report NA Report Federal ELG Weekly Grab <br />Settleable Solids mYl Report NA Report Federal ELG Weekly Grab <br />Otter Conditions <br />Jn1kkjn%dation <br />An antidegradation review applies to this discharge as the receiving stream is classified as Undesignated. As outlined in the permit and- <br />rationale to this general permit, the antidegradation based limitations are calculated as 15% of the applicable water quality standard. <br />The only parameter subject to an antidegradation review is total recoverable iron. As this limit based on the WQS is more stringent <br />sham that contained in the previous permit, there is no new or increased impact to the receiving water and therefore the WQS will be <br />applied in the permit. <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 />Sawlin <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 Re o�rttng <br />Discharge Monitoring Reports (DMR) must be submitted monthly 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 />Beat hn'g amot Pffle" <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; tine 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 J. Neulart <br />303 - 692 -3655 <br />June 25, 2008 <br />