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COLORADO DEPARTMENT OF PUBLIC HEALTHAND ENVIRONMENT, Water Quality Control Division Rationale, Page 7, COG-0850000 Coal Mining General Permit Alternate Limitations For Acid Or Ferruginous Mine Drainage (except as covered below under coal refuse piles or mountaintop removal) - Table III-5b contains limitations for any discharge or increase in the volume of a discharge from an above ground mine (or underground mine where the effluent is commingled with other categorical wastewater prior to discharge), caused by precipitation within any 24 hour period less than or equal to the 2 -year, 24-hour precipitation event (or snowmelt of equivalent volume) may substitute the following limitations for these specific parameters only, subject to burden of proof requirements described in Part LB.4 of the permit. Table III-5b: Alternate Effluent Limitations and Monitoring Requirements - Acid or Ferruginous Mine Drainage Parameter Limitations 30-Da V 7-Day Daily Ratlionale . nc u San Aug -- 4 tig. ' A1ax. Freq y e Frequency T3Te e --- Federal Effluent Limitation Guidelines Total Suspended Solids, mg/1 Report NA Report Federal ELG Weekly Grab Total Manganese, mg11 Report NA Report Federal ELG Weekly Grab Total iron, mg11 Existing Sources (before 514184) Report NA 7.0 Federal ELG Weekly Grab New Sources (after 514184) Report NA Report Settleable Solids, m117 Report NA 0.5 Federal ELG Weekly Grab Alternate Limitations For Acid Or Ferruginous Mine Drainage (except as covered below under coal refuse piles or mountaintop removal) - Table III-5c contains limitations for any discharge or increase in the volume of a discharge from an above ground mine (or underground mine where the effluent is commingled with other categorical wastewaterprior to discharge), caused by precipitation within any 24 hour period greater than the 2 -year, 24-hour precipitation event, but less than or equal to the 10 year, 24-hour precipitation event (or snowmelt of equivalent volume) may substitute the following limitations for these specific parameters only, subject to burden of proof requirements described in Part LB.4. Table III-5e: Alternate Effluent Limitations and Monitoring Requirements -Acid or Ferruginous Mine Drainage _ -- Parameter Limitations 30-Day 7-Day Daily Rationale Monitoring Frrequency Sample Type Federal Effluent Limitation Guidelines Total Suspended Solids, mga Report NA Report Federal ELG Weekly Grab Total Manganese, mg/7 Report NA Report Federal ELG Weekly Grab Total Iron, mg/1 Existing Sources (before 514184) Report NA Report Federal ELG Weekly Grab New Sources (after 514184) Report NA Report Settleable Solids, m111 Report NA 0.5 Federal ELG Weekly Grab Alternate Limitations For Acid Or Ferruginous Mine Drainage (except as covered below under coal refuse piles or mountaintop removal) - Table III-5d contains limitations for any discharge or increase in the volume of a discharge from an above ground mine (or underground mine where the effluent is commingled with other categorical wastewater prior to discharge), caused by precipitation within any 24 hourperiod greater than the 2 -year, 24-hour precipitation event, but greater than the 10-year, 24-hour precipitation event (or snowmelt of equivalent volume) may substitute the following limitations for these specific parameters only, subject to burden of proof requirements described in Part I.B.4. Table III-5d: Alternate Effluent Limitations and Monitoring Requirements -Acid or Ferruginous Mine Drainage Limitations Aonitoring Sample Parameter 30-Dav : 7-Day Daily Rationale Frequency I Type Atig. Ay$: _ _ A1czx. Federal Effluent Limitation Guidelines Total Suspended Solids, mg11 Report NA Report Federal ELG Weekly Grab Total Manganese, mg/1 Report NA Report Federal ELG Weekly Grab Total Iron, mg11 Existing Sources (before 514184) Report NA Report Federal ELG Weekly Grab New Sources (after 514184) Report NA Report Settleable Solids, m111 Report NA Report Federal ELG Weekly Grab