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PART L <br />Page No. 9 <br />Permit No. COG-850000 <br />ALTERNATE LIMITATIONS FOR ACID OR FERRUGINOUS MINE DRAINAGE <br />(except as covered below under coal refuse piles or mountaintop removal) <br />Any discharge or increase in the volume of a discharge from an above ground mine (or underground mine where the <br />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 2-year, 24-hour precipitation event (or snowmelt of equivalent volume) may <br />substitute the following limitations for these specific parameters only, subject to burden of proof requirements <br />described in Part I.B.6. <br /> <br />Parameter Limitations <br />30-Day <br />7-Day <br />Daily <br />Rationale <br />Monitoring) <br />Fre <br />uenc <br />Sample <br />T <br />e <br /> Avg. Avg. Max. q <br />y yp <br />-----------------------------------------Federal Effluent Limitation Guidelines---------------------------- ----------------- <br />Total Suspended Solids, mg/1 Report NA Report Federal ELG Weekly Grab <br />Total Manganese, mg/1 Report NA Report Federal ELG Weekly Grab <br />Total Iron, mg/1 <br />Existing Sources (before 5/4/84) Report NA 7.0 Federal ELG Weekly Grab <br />New Sources (after 5/4/84) Report NA Report <br />Settleable Solids, ml/1 Report NA 0.5 Federal ELG Weekl Grab <br />Any discharge or increase in the volume of a discharge from an above ground mine (or underground mine where the <br />effluent is commingled with other categorical wastewater prior to discharge), caused by precipitation within any 24 <br />hour period greater than the 2-year, 24-hour precipitation event, but less than or equal to the 10-year, 24-hour <br />precipitation event (or snowmelt of equivalent volume) may substitute the following limitations for these specific <br />parameters only, subject to burden of proof requirements described in Part I.B.6. <br /> <br /> <br />Parameter Limitations <br /> <br />30-Day <br /> <br />7-Day <br /> <br />Daily <br /> <br />Rationale <br />Monitoring <br />Frequency ~ <br />Sample <br />Type <br /> Avg. Avg. Max. <br />---------------------------------------- Federal Effluent Limitation Guidelines--------------------------------------------- <br />Total Suspended Solids, mg/1 Report NA Report Federal ELG Weekly Grab <br />Total Manganese, mg/1 Report NA Report Federal ELG Weekly Grab <br />Total Iron, mg/1 <br />Existing Sources (before 5/4/84) Report NA Report Federal ELG Weekly Grab <br />New Sources (after 5/4/84) Report NA Report <br />Settleable Solids, mUl Report NA 0.5 Federal ELG Weekly Grab <br />Any discharge or increase in the volume of a discharge from an above ground mine (or underground mine where the <br />effluent is commingled with other categorical wastewater prior to discharge), caused by precipitation within any 24 <br />hour period greater than the 2-year, 24-hour precipitation event, but greater than the 10-year, 24-hour precipitation <br />event (or snowmelt of equivalent volume) may substitute the following limitations for these specific parameters only, <br />subject to burden of proof requirements described in Part I.B.6. <br /> <br />Parameter Limitations <br />30-Day <br />7-Day <br />Daily' <br />Rationale <br />Monitoring) <br />Fre <br />uenc <br />Sample <br />T <br /> Avg. Avg. Max. <br />q <br />y <br />ype <br />---------------------------------------- Federal Efflue nt Limitation Guidelines--------------------------------------------- <br />Total Suspended Solids, mg/1 Report NA Report Federal ELG Weekly Grab <br />Total Manganese, mg/1 Report NA Report Federal ELG Weekly Grab <br />Total Iron, mg/1 <br />Existing Sources (before 5/4/84) Report NA Report Federal ELG Weekly Grab <br />New Sources (after 5/4/84) Report NA Report <br />Settleable Solids, mUl Report NA Report Federal ELG Weekly Grab <br />• <br />