2008-09-15_PERMIT FILE - C1992081

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COLORADO DEPARTMENT OF PUBLIC HEALTHAND ENVIRONMENT, Water Quality Control Division Rationale, Page 6, COG-0850000 Coal Mining General Permit Table III-4: Eff Iuent Limitations and Monitoring Requirements -Post Mining reclamation Areas Limitations Monitoring Sample Parameter 30-Day 7-Day Daily Rationale Frequency 1 Type Avg. Avg. Max. ------General Permit Requirements-----------__________________ ~~~_____________ _ _____ Continuous / Recorder / Flow, MGD Report NA Report Discharge Evaluation Instantaneous2 In-situ Z s.u. pH N/A NA 6.5-9.0 Water Quality Standards Weekly Grab l s , Oil and Grease, mg/1 N/A NA 10 State Effluent Regulations Weekly Visua _ - Federal Effluent Limitation Guidelines-------------_____________ __________ Total Suspended Solids, mg/1 35 NA 70 Federal ELG Weekly Grab Totallron, mg/1 Existing Sources (before 5/4/84) 3.5 NA 7.0 Federal ELG Weekly Grab New Sources (after 5/4/84) Settleable Solids, ml/1 3.0 NA 6.0 Report NA 0.5 Federal ELG Weekly Grab -----Site Specific Limitations------------------_w_~_________ ort Salinity Regulations * _ Y R t NA Re ______w Quarterly a Grab Total Dissolved Solids, mg/1 Total Phosphorus (as P), mgR ** p epor Report NA Various Control Regulations y Monthl Grab Total Recoverable Iron, ug/1 *** 1000 NA NA Water Quality Standards Weekly Grab Other Polhttants of Concern Various NA Various Water Quality Standards Weekly Grab Whole Effluent Toxicity (YVET) Chronic Stat Diff and IC25 > IWC State Permit Limitations Quarterly 3 Grab/Test Acute LC50 > 100% State Permit Limitations Grab Footnotes 1-4, *, **, and *** - See Foornotes under Table III-1 and Table III-2. 5. E went Limitations and Monitorin Re uirements -Acid or Ferru inous Mine Draina e - Tables III-Sa through III-Se apply to this category, subject to 40 CFR Part 434 Subparts C (Acid or Ferruginous Mine Drainage). At a minimum, the following limitations may apply as outlined in these subparts. Table III-Sa: Effluent Limitations and Monitoring Requirements -Acid or Ferruginous Mine Drainage Limitations ' Monttorng Parameter 30-Day - 7-DayX Daily _ Rationale . Frequency 1 Avg.- Avg. ,Max: , ~ ~ _. , , _ General Permit Requirements-----------------______~_____ _----____-----------------------------_- ~____ Continuous / Flow, MGD Report NA Re ort p Dischar e Evaluation g Instantaneousz s.u. pH N/A NA 6.5-9.0 Water Quality Standards Weekly , Oil and Grease, ntg/l N/A NA 10 State Effluent Regulations Weekly --Federal Effluent Limitation Guidelines--____________~~_____ -' _______ Total Suspended Solids, mg/1 35 NA 70 Federal ELG Weekl Y Total Manganese, mg/I 2.0 NA 4.0 Federal ELG Weekly Totallron, mg/1 Existing Sources (before S/4/84) 3.5 NA 7.0 Federal ELG Weekly New Sources (after S/4/84) Settleable Solids, ml/1 3.0 Report NA NA 6.0 0.5 Federal ELG Weekly ------------------------------------------Site Specific Lim itations--------_---ry ---~ ------------- i l R -------- Quarterly a Total Dissolved Solids, rng/1 * Report NA Re ort ons ot e Salini l i Monthl Total Phosphorus (as P), mg/I *' Report NA Various ons at Control Regu y Total Recoverable Iron, ug/1 *** 1000 NA NA Water Qctality Standards Weekly Other Pollutants of Concern Various NA Various Water Qctality Standards Weekly Whole Effluent Toxicity (WET) Chronic Stat D~and IC25 > IWC State Permit Limitations Quarterly Acute LCSO > 10 0% State Permit Limitations Sample Type . Recorder / In-situ z Grab Visual j Grab Grab Grab Grab Grab Grab Grab Grab 3 Grab/Tes~ Grab Footnotes 1-4, *, **, and *** - See Footnotes a~nder Table III-1 and Table III-2.