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PARTI <br />Page No. 9 <br />Pemrit No. COG-850000 <br />ALTERNATE LDIITATIONS 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 /> Limitatiotts ,._, -- , __- _ "- -- monitoring Sample <br />Parameter- 30-Day 7-Day Daily Rationale i <br />Freque y <br />Type <br /> Av Av _. Mar: <br /> Federal Effluent Limitation Guidelines <br />Total Suspended Solids, mg/l Report NA Report Federal ELG Weekly Grab <br />G <br />b <br />Total Manganese, mg/l Report NA Report Federal ELG Weekly ra <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 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 an y 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 /> Monitoring Sale <br />.Parameter 30=Day 7-Day ,Daily Rationales Frequ Cy i <br />ype <br /> Avg:. Avg Max: <br /> Federal Effluent Limitation Guideline <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 Report 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 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 />- - - --v .; , - - <br />I.imitatians Monitoring Sample <br />Parameter 34-Day 74Day Daily Rationale Frequency , + Type <br />Avg:.: _ 1o.. .. , . _ . _ _ _ .. - <br />Federal Effluent Limitation Guideline <br />Total Suspended Solids, mg/1 Report NA Report Federal ELG Weekly Grab <br />' Total Manganese, mg/l 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, ml/1 Report NA Report Federal ELG Weekly Grab