2008-07-07_HYDROLOGY - C1983059 - Laserfiche WebLink

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Permit No. COG-850000 Facility No. COG-850028 Page /b ALTERNATE LIMITATIONS FOR COAL PREPARATION AREAS The following table contains limitations for any discharge or increase in the volume of a discharge from a coal preparation area caused by precipitation within any 24-hour period less than or equal to the 10-year, 24-hour precipitation event (or snowmelt of equivalent volume) may substitute the following limitations for these specific parameters only, subject to burden of proof requirements described in Part I.B.4 of the permit. -- Paranteter 30- 7-Day Daily Rationale Monitoring Sample Day 1! Avg. Max. Frequency Tl-pe ' Av Federal Effluent Limitation Guidelines----------- Total Suspended Solids, mgll Report NA Report Federal ELG Weekly Grab The following table contains limitations for any discharge or increase in the volume of a discharge from a coal preparation area, caused by precipitation within any 24-hour period greater than the 10-year, 24-hour precipitation event (or snowmelt of equivalent volume) may substitute the following limitations for these specific parameters only, subject to burden of proof requirements described in Part I.B.4 of the permit. Lintttations. t m : " a :; Alonitorin Santple Pdrameter 30-Day 1 -Day " Daily Rationale g gy Frequencv t?. Type Federal Effluent Limitation Guidelines Total Suspended Solids, mg11 Report NA Report Federal ELG Weekly Grab Settleable Solids, m111 Report NA Report Federal ELG Weeklv Grab Other Conditions Antidegradation Antidegradation review does not apply to this permit because limitations based on Water Quality Standards are not applied in this certification. Groundwater Contamination If groundwater contamination is encountered, then the permittee is to contact the Division, cease all discharges, and if appropriate, contact the owner of the collection system receiving the discharge. Since the discharge of contaminated groundwater is not covered under this permit, the permittee shall immediately apply for a groundwater remediation certification, which will include appropriate requirements for additional discharge monitoring and on-site environmental response capabilities. Sampling Sampling shall occur at a point after treatment, or after the implementation of any Best Management Practices (BMPs). If BMPs or treatment are not implemented, sampling shall occur where the discharge leaves control of the permittee, and prior to entering the receiving stream or prior to discharge to land. Samples must be representative of what is entering the receiving stream. Monitoring and Reporting Discharge Monitoring Reports (DMR) must be submitted monthly as long as the certification is in effect. The permittee shall provide the Division with any additional monitoring data on the permitted discharge collected for entities other than the Division. This will be supplied to the Division within 48 hours of the receipt of the data by the permittee. Best Management Practices The permittee shall implement and maintain the Best Management Practices (BMP) for the prevention of erosion and the control of solid and liquid pollutants due to the discharge. BMPs include various options, such as: modification of the pipe discharge structure to disperse flows; containment of water by hay bales or other comparable structures; the use of geocloth, filter fabric, or plastic sheeting for protection of containment structures; rip-rap; and/or any other approved methods. The General Permit for Coal Mining is attached and the permittee should review this permit for familiarity with all of the permit requirements. If the permittee has questions related to this certification that cannot be answered by a review of the permit, the permit writer should be contacted. Andrew J. Neuhart 303-692-3655 06/24/08