2006-03-21_PERMIT FILE - C1981022

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.,_ CERTIFICATION TO DISCHARGE UNDER CDPS GENERAL PERMIT COG850000 DISCHARGES ASSOCIATED WITH COAL MINING AND PROCESSING Certification Number: COG850064 Colorado ppeeparcment This Certification to Discharge specifically authorizes: of Public Health Oxbow Mining LLC and Environment to discharge from the facility identified as Elk Creek Mine to: Elk Creek Facility Located at: 3737 Hwy 133, Gunnison County, Somerset, CO 81434 Facility Location Latitude 38.96897; Longitude - 107.46413 Discharge Number 015E Latitude 38.96897; Longitude - 107.46413 External Outfall N11 discharges must comply with the lawful requirements of federal agencies municipalities, counties, drainage districts and other hrcal agencies regarding any drsetarges to storm drain systems, conveyances, or other eater causes under their jurisdiction Permit Limitations and Monitoring Requirements apply to 015B as outlined in the Permit Part I.B and Part I.0 ' — For a minor facility, as determined by the EPA NPDF.S Permit Rating Worksheet, all weekly monitoring requirementi shall be changed to 2 days per month- 2 — If power is not available, flow may be measured on an instantaneous basis. Major facilities shall monitor flow weekly, minor facilities 2 days / month — If a visual sheen is noticed, a grab sample must be taken and analyzed for oil and grease •iWC— 100% '— Acute WET testing shall be conducted if the discharge meets one of the following: (A) the maximum discharge frequency is less than 3 consecutive days (72 hours), and less than 3 days per 7 day period, and less than 10 days total per month, (B) the maximum discharge frequency is less than 5 consecutive days (120 hours) and less than 5 total days per month The permatce is required to submit documentation whenever dischrrge that is subject to acute WET testing occurs regarding the duration of the actual discharge event. The Division removed Ceriodaphnia sp. testing to outfall 015 in the existing permit C00000132 as a result of a toxicity study. Detailed information can be found in the factsheet for permit C00000132. Since the water quality of outfall 015 is similar or the same as that of Outfall 0158, the acute species has been changed to daphnia magna in lieu of C eriodaphnia for ac ate WET, should the discharge meet the intermittent definition as provided by 4(A) & 4(B). The permittee shall conduct an acute 48- hr WT•.T test using daphnia magna and a 96 -hour Wl'-..T test using fathead minnows. Modified and reissued 05/23/2013 Effective 6/1/2013 Certification Expires: 6/30/2013 Certification originally issued 4/16/2013 Effective 4/16/2013 This certification under the permit requires that specific actions be performed at designated times. The certification holder is legally obligated to comply with all terms and conditions of the permit. Signed, ✓f'v� Erin Scott Acting Unit Manager Assessment Based Permits Unit Water Quality Control Division Page 1 of 15 Discharge Limitations Maximum Concentrations Monitoring Parameter Units Rationale Frequency Sam le Type p yp 30 -Day 7 -Day Average Average Daily Max. Flow, MGD Report NA Report Discharge Instantaneous' or ) Recorder/ In -situ 50050 Evaluation Co itinuous pH, (Minimum- Water Quality Maximum) $.u. NA NA 6.5 -9.0 2 Days /Month Grab Standards Dial Suspended Solids, mg/I 35 NA 70 Federal ELG 2 Days /Month Grab 00530 Oil and Grease Visual NA NA Report State Effluent 2 Days /Month Visual' 84066 Regulations Oil and Grease, mg/I NA NA 10 State Effluent Contingent' Grab 03582 Regulations Total Dissolved Solids mg/I NA NA Report Salinity Quarterly Grab 70295 Regulations Iron (Total Recoverable), ug/I 1,000 NA Report Water Quality 2 Days /Month Grab 00980 Standards WET, Chronic Staf Doff and State Permit Quarterly 3 Grab/Test I C25 > =1WC' Limitations WET, Acute° LC50 >300% State Permit Quarterly Grab Limitations ' — For a minor facility, as determined by the EPA NPDF.S Permit Rating Worksheet, all weekly monitoring requirementi shall be changed to 2 days per month- 2 — If power is not available, flow may be measured on an instantaneous basis. Major facilities shall monitor flow weekly, minor facilities 2 days / month — If a visual sheen is noticed, a grab sample must be taken and analyzed for oil and grease •iWC— 100% '— Acute WET testing shall be conducted if the discharge meets one of the following: (A) the maximum discharge frequency is less than 3 consecutive days (72 hours), and less than 3 days per 7 day period, and less than 10 days total per month, (B) the maximum discharge frequency is less than 5 consecutive days (120 hours) and less than 5 total days per month The permatce is required to submit documentation whenever dischrrge that is subject to acute WET testing occurs regarding the duration of the actual discharge event. The Division removed Ceriodaphnia sp. testing to outfall 015 in the existing permit C00000132 as a result of a toxicity study. Detailed information can be found in the factsheet for permit C00000132. Since the water quality of outfall 015 is similar or the same as that of Outfall 0158, the acute species has been changed to daphnia magna in lieu of C eriodaphnia for ac ate WET, should the discharge meet the intermittent definition as provided by 4(A) & 4(B). The permittee shall conduct an acute 48- hr WT•.T test using daphnia magna and a 96 -hour Wl'-..T test using fathead minnows. Modified and reissued 05/23/2013 Effective 6/1/2013 Certification Expires: 6/30/2013 Certification originally issued 4/16/2013 Effective 4/16/2013 This certification under the permit requires that specific actions be performed at designated times. The certification holder is legally obligated to comply with all terms and conditions of the permit. Signed, ✓f'v� Erin Scott Acting Unit Manager Assessment Based Permits Unit Water Quality Control Division Page 1 of 15