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COLORADO DEPARTMENT OF PUBLIC HEALTH AND 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-5b 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 wastewaterprior 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 specific parameters only, subject to <br />burden of proof requirements described in Part LB.4 of the permit. <br />Table III-5b: Alternate Effluent Limitations and Monitoring Requirements -Acid or Ferruginous Mine Drainage <br /> <br />Parameter Limitations <br />30-Dnv <br />7-Day <br />Daily Rationale Monitoring <br />r <br />Frequency Sample <br /> <br />13Pe <br /> Atg. 4.-- Mnx. <br /> Federal Effluent Limitation Guidelines <br />Total Suspended Solids, mg11 Report NA Report Federal ELG Weekly Grab <br />Total Manganese, mg11 Report NA Report Federal ELG Weekly Grab <br />Total Iron, mg11 <br />Existing Sources (before 514184) Report NA 7.0 Federal ELG Weekly Grab <br />New Sources (after 514184) Report NA Report - <br />Settleable Solids, m1q 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-5c 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 wastewaterprior to <br />discharge), caused byprecipitation within any 24 hourperiod 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 LB.4. <br />Table III-5c: Alternate Effluent Limitations and Monitoring Requirements -Acid or Ferruginous Mine Drainage <br /> Linittutions <br />Parameter 30-Dav 7-Day Daily Rationale tilonirorit+g <br />r <br />Frequency Jcrrviple <br /> <br />Type ` <br />_ - atg. Avg. _ ,blur. <br /> Federal <br />Effluent Limitation Guidelines <br />Total Suspended Solids, mg11 Report NA Report Federal ELG Weekly Grab <br />Total Manganese, mg/7 Report NA Report Federal ELG Weekly Grab <br />Total Iron, mg/7 <br />Existing Sources (before 514184) Report NA Report Federal ELG Weekly Grab <br />New Sources (after 514184) Report NA Report <br />Settleable Solids, mb,7 Report NA 0.5 Federal ELG Weekly Grab <br /> <br />Alternate Limitations For Acid Or Ferruginous Mine Drainage (except as covered below under coal refuse piles or <br />mountaintop removal) - Table III-5d 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 specific parameters only, subject to burden ofproof requirements described in Part LB.4. <br />Table III-5d: Alternate Effluent Limitations and Monitoring Requirements - Acid or Ferruginous Mine Drainage <br /> <br />Parameter Limitations <br />30=Day" <br />7-Dory <br />Daily <br />Rationale Monitoring <br />r <br />Frequency <br />; Sample <br /> <br />Type <br /> t1c?x. , ' <br /> Federal Effluent Limitation Guidelines <br />Total Suspended Solids, mg/7 Report NA Report Federal ELG Weekly Grab <br />Total Manganese, mg11 Report NA Report Federal ELG Weekly Grab <br />Total Iron, mg/1 <br />Existing Sources (before 514184) Report NA Report Federal ELG Weekly Grab <br />New Sources (after 514184) Report NA Report <br />Settleable Solids, ml/7 Report NA Report Federal ELG Weekly Grab