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Permit No. COG-850000 <br />Facility No. COG-850028 <br />Page /b <br />ALTERNATE LIMITATIONS FOR COAL PREPARATION AREAS <br />The following table contains limitations for any discharge or increase in the volume of a discharge from a coal preparation area caused <br />by precipitation within any 24-hour period less than or equal to the 10-year, 24-hour precipitation event (or snowmelt of equivalent <br />volume) may substitute the following limitations for these specific parameters only, subject to burden of proof requirements described <br />in Part I.B.4 of the permit. <br />-- <br />Paranteter 30- 7-Day Daily Rationale Monitoring Sample <br />Day 1! Avg. Max. Frequency Tl-pe ' <br />Av <br />Federal Effluent Limitation Guidelines----------- <br />Total Suspended Solids, mgll Report NA Report Federal ELG Weekly Grab <br />The following table contains limitations for any discharge or increase in the volume of a discharge from a coal preparation area, caused <br />by precipitation within any 24-hour period greater than the 10-year, 24-hour precipitation event (or snowmelt of equivalent volume) <br />may substitute the following limitations for these specific parameters only, subject to burden of proof requirements described in Part <br />I.B.4 of the permit. <br />Lintttations. <br />t m : " a :; Alonitorin Santple <br />Pdrameter 30-Day 1 -Day " Daily Rationale g <br />gy Frequencv t?. Type <br />Federal Effluent Limitation Guidelines <br />Total Suspended Solids, mg11 Report NA Report Federal ELG Weekly Grab <br />Settleable Solids, m111 Report NA Report Federal ELG Weeklv Grab <br />Other Conditions <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 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 />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 />Andrew J. Neuhart <br />303-692-3655 <br />06/24/08