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COLORADO DEPARTMENT OF PUBLIC HEALTHAND ENVIRONMENT, Water Quality Control Division <br />Rationale, Page 7, COG-0850000 Coal Mining General Permit <br />Alternate Limitations For Acid Or Ferruginous Mine Drainage (except as covered below under coal refuse piles or <br />mountaintop removal) -Table III-Sb contains limitations for any discharge or increase in the volume of a discharge from an <br />above ground mine (or underground mine where the effluent is commingled with other categorical wastewater prior to <br />discharge), caused by precipitation within any 24 hour period less than or equal to the 2 year, 24-hour precipitation event <br />(or snowmelt of equivalent volume) may substitute the following limitations for these specifzc parameters only, subject to <br />burden of proof requirements described in Part I.B.4 of the permit. <br />Table III-Sb: Alternate Effluent Limitations and Monitoring Requirements -Acid or Ferruginous Mine Drainage <br /> <br />Parameter Limitations <br />30-Day <br />7-Day <br />Daily Rationale <br />Monitoring) <br />Frequency <br />Sample <br />Type <br /> Avg. Avg. Max. <br />_-______-_____________-________- _Federal Effluent Limitation Guidelines----------_--_-_-_ ~_____~_~__- <br />Total Suspended Solids, mg/Z Report NA Report Federal ELG Weekly Grab <br />Total Manganese, mg/l Report NA Report Federal ELG Weekly Grab <br />Totallron, mg/Z <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/Z Report NA 0.5 Federal ELG Weekl Grab <br />Alternate Limitations For Acid Or Ferruginous Mine Drainage (except as covered below under coal refuse piles or <br />mountaintop removal) -Table III-Sc contains limitations for any discharge or increase in the volume of a discharge from an <br />above ground mine (or underground mine where the effluent is commingled with other categorical wastewater prior to <br />discharge), caused by precipitation within any 24 hour period greater than the 2 year, 24-hour precipitation event, but less <br />than or equal to the 10 year, 24-hour precipitation event (or snowmelt of equivalent volume) may substitute the following <br />limitations for these specific parameters only, subject to burden of proof requirements described in Part I.B.4. <br />Table III-Sc: <br />Parameter <br />Sample <br />Type <br />• <br />• <br />Alternate Effluent Limitations and Monitoring Requirements -Acid or Ferruginous Mine Drainage <br />Limitations Monitoring <br />30-Day 7-Day Daily Rationale 1 <br />Frequency <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 />Totallron, mg/Z <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/Z Report NA 0.5 Federal ELG Weekly Grab <br />Alternate Limitations For Acid Or Ferruginous Mine Drainage (except as covered below under coal refuse piles or <br />mountaintop removal) -Table III-Sd contains limitations for any discharge or increase in the volume of a discharge from an <br />above ground mine (or underground mine where the effluent is commingled with other categorical wastewater prior to <br />discharge), caused by precipitation within any 24 hour period greater than the 2 year, 24-hour precipitation event, but <br />greater than the 10 year, 24-hour precipitation event (or snowmelt of equivalent volume) may substitute the following <br />limitations for these specifzc parameters only, subject to burden of proof requirements described in Part I.B.4. <br />Table III-Sd: Alternate Effluent Limitations and Monitoring Requirements -Acid or Ferruginous Mine Drainage <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. y <br />q yp <br />-----------------------------------Federal Effluent Limitation Guidelines--------------------- ------------------ <br />Total Suspended Solids, mg/l Report NA Report Federal ELG Weekly Grab <br />Total Manganese, mg/Z Report NA Report Federal ELG Weekly Grab <br />Totallron, mg/Z <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 Weekl Grab <br />