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PARTI <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 /> Limitations <br />' <br />Monitoring <br />Sample <br />Paramvter 30-Day. 7-Day Daily Rationale Frequent 5' Type <br /> Avg. Avg. M2uc. <br /> Federal Effluent Limitation Guidelines <br />Total Suspended Solids, mg/l Report NA Report Federal ELG Weekly Grab <br />Total Manganese, mg/l Report NA Report Federal ELG Weekly Grab <br />Total Iron, mg/l <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/l 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 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 />Parameter 30-Day 7-Day Daily Rationale Monitoring Saanple <br />,:6yff- Avg-,_ _ _Max. Frequency Type <br />Federal Effluent Limitation Guidelines <br />Total Suspended Solids, mg/l Report NA Report Federal ELG Weekly Grab <br />Total Manganese, mg/1 Report NA Report Federal ELG Weekly Grab <br />Total Iron, mg/l <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 />Para rue ter Limitations <br />30-Day <br />7-Day <br />Daily <br />Rationale <br />Monitoring <br />Frequency <br />Sample <br />Type <br /> Avg. Avg. Max. <br /> Federal Effluent Limitation Guidelines <br />Total Suspended Solids, mg/l Report NA Report Federal ELG Weekly Grab <br />Total Manganese, mg/1 Report NA Report Federal ELG Weekly Grab <br />Total Iron, mg/l <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, ml/l Report NA Report Federal ELG Weekly Grab