2012-06-20_PERMIT FILE - C2010089 (57)

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COLORADO DEPARTMENT OF PUBLIC HEALTH AND 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 ofa 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 ofproof requirements described in Part LB.4 of the permit. Table III -5b: Alternate Effluent Limitations and Monitoring Requirements — Acid or Ferruginous Mine Drainage ------ _--- -:------ L-- _- - - - - -- Federal Efflu Limitation Guidelines' ; Total Suspended Solids, mg/1 Report NA Report Federal ELG Total Manganese, mg/1 Report NA Report Federal ELG Total Iron, mg/1 Existing Sources (before 5/4/84) Report NA 7.0 Federal ELG New Sources (after 5 /4/84) Report NA Report Settleable Solids, rnl/I Report NA 0.5 Federal ELG Total Suspended Solids, mg/l Total Manganese, mg/l Total Iron, mg/1 Existing Sources (before 5/4/84) New Sources (after 5/4/89) Settleable Solids, ml/1 - Federal Effluent Limitation Guidelines. Report NA Report ' Federal ELG Report NA Report Federal ELG Report NA Report Federal ELG Report NA Report Report NA 0.5 Federal ELG Weekly. Weekly Weekly Weekly Weekly Weekly Federal Effluent Limitation Guidelines-------------------------- _- _-_ - -- Total Suspended Solids, mg/1 Report NA Report Federal ELG Weekly Total Manganese, mg/1 Report NA Report Federal ELG Weekly Total Iron, mg/l Existing Sources (before 5/4/84) Report NA Report Federal ELG New Sources (after 5/4/84) Report NA Report Settleable Solids, m1/1 Report NA Report Federal ELG Grab Grab Grab 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 aboveground mine (or underground mine where the effluent is commingled with other categorical wastewater prior 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 ofproof requirements described in Part LB.4. Table HI-5c: Alternate Ef uent Limitations and Monitoring Requirements —Acrd or Feria • inous Mine Drainage Grab Grab Weekly Grab 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 wastewaterprior to discharge), caused by precipitation within any 24 hour period 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 ofproof requirements described in Part 1.13.4. Table III -5d: Alternate Ef uent Limitations and Monitorin: Re' uireinents —Acid or Ferru inous Mine Draina :e Grab Grab Weekly Grab Weekly Grab