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PART 11
<br />Page No, 4
<br />Permit No. COG -850000
<br />5. No chemicals shall be added to the discharge unless the Division grants specific approval in a certification, letter, or other
<br />form of communication. To approve a new chemical, the Division must have the chemical's MSDS sheet. All chemicals
<br />must be used and stored in accordance with the manufacturers recommendations and in accordance with any applicable
<br />state or federal regulation.
<br />6. There shall be no discharge of solid animal or food waste, vegetative wastes (grass, leaves, manure, garbage, etc), or any
<br />floating solids or visible foam, in other than trace amounts.
<br />7. All discharges must comply with the lawful requirements of federal agencies, municipalities, counties, drainage districts
<br />and other local agencies regarding any discharges to storm drains systems, conveyances, or other water courses under their
<br />jurisdiction. In addition, prior to the discharge the permittee must notify the owner of the system of the date, approximate
<br />time, location, and duration of the discharge(s).
<br />B. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
<br />1. Effluent Limitations - Surface Runoff or Non -Coal Mining Related Waste Streams
<br />Limitations Monitoring
<br />Parameter 30 -Day 7 -Day Daily Rationale Frequency 1
<br />Avg. Avg. Max.
<br />_____—_—___General Permit
<br />Flow, MGD Continuous /
<br />Report NA Report Discharge Evaluation Instantaneous2
<br />Sample
<br />Type
<br />Recorder/
<br />In-situ 2
<br />Grab
<br />Visual'
<br />pH, s.u.
<br />N/A
<br />NA 6.5-9.0 Water Quality Standards
<br />Weekly
<br />NA Report Salinity Regulations
<br />Oil and Grease, mg/l
<br />N/A
<br />NA 10 State Effluent Regulations
<br />Weekly
<br />Other Pollutants of Concern Various
<br />_�___--__Federal
<br />Effluent
<br />Limitation
<br />Settleable Solids, ml/I
<br />Report
<br />NA 0.5 Federal ELG
<br />Weekly
<br />Grab
<br />Settleable Solids ml/1 *
<br />Report
<br />NA Report Federal ELG
<br />Weekly
<br />Grab
<br />1 — For a minor facility, as determined by the EPA NPDES Permit Rating Worksheet, all weekly monitoring requirements shall be changed to 2 days per month
<br />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
<br />3 — if a visual sheen is noticed, a grab sample must be taken and analyzed for oil and grease
<br />4 — Quarterly monitoring shall be prescribed if the limitation is based upon discharge to the Colorado River Basin. If the limitation is based upon agricultural
<br />protection, the monitoring frequency shall be weekly.
<br />• if caused by precipitation within any 24-hour period greater than the 10 -year, 24-hour precipitation event (or snowmelt of equivalent volume)
<br />•' The TDS limitation will normally apply to discharges in the Colorado River Basin. An evaluation of the discharge will take place upon certification, to see if the
<br />facility meets the 1 ton/day or 350 tons/year allowable discharge of salt. If the facility does not meet this requirement, the facility will be required to submit a
<br />salinity report documenting that achieving this level of discharge is not feasible. See Regulation 61.8(2)(1) for more information.
<br />***The phosphorus limitations apply to discharges to the Dillon Reservoir Wateshed, Cherry Creek Reservoir Watershed, Chatfield Reservoir Watershed, and the
<br />Bear Creek Watershed, as defined in Regulation 71, 72, 73 or 74 respectively. The permittee may be required to obtain a phosphorus allocation from the applicable
<br />control regulation authority prior to certification under this general permit.
<br />2. Effluent Limitations – Alkaline Drainage, Coal Preparation Plants and Coal Preparation Plant Associated Areas and Western
<br />Alkaline Coal Mining (additional requirements may apply to Western Coal Mining, See Part I.B.2)
<br />a. Alkaline Mine Drainaee - means mine drainage which, before any treatment, has a pH equal to or greater than 6.0 and
<br />total iron concentration of less than 10 mg/l.
<br />b. Coal Preparation Plants – means a facility where coal is subjected to cleaning, concentrating, or other processing or
<br />preparation in order to separate coal from its impurities and then is loaded for transit to a consuming facility.
<br />c. Coal Preparation Plant Associated Areas - means the coal preparation plant yards, immediate access roads, coal
<br />refuse piles and coal storage piles and facilities.
<br />d. Western Coal Mining Operation - means a surface or underground coal mining operation located in the interior
<br />western United States, west of the 100th meridian west longitude, in an and or semiarid environment with an average
<br />Specific
<br />Total Dissolved Solids, mg/l •• Report
<br />NA Report Salinity Regulations
<br />Quarterly Grab
<br />Total Phosphorus (as P), mg/l ••• Report
<br />NA Various Control Regulations
<br />Monthly Grab
<br />Other Pollutants of Concern Various
<br />NA Various Water Quality Standards
<br />Weekly Grab
<br />1 — For a minor facility, as determined by the EPA NPDES Permit Rating Worksheet, all weekly monitoring requirements shall be changed to 2 days per month
<br />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
<br />3 — if a visual sheen is noticed, a grab sample must be taken and analyzed for oil and grease
<br />4 — Quarterly monitoring shall be prescribed if the limitation is based upon discharge to the Colorado River Basin. If the limitation is based upon agricultural
<br />protection, the monitoring frequency shall be weekly.
<br />• if caused by precipitation within any 24-hour period greater than the 10 -year, 24-hour precipitation event (or snowmelt of equivalent volume)
<br />•' The TDS limitation will normally apply to discharges in the Colorado River Basin. An evaluation of the discharge will take place upon certification, to see if the
<br />facility meets the 1 ton/day or 350 tons/year allowable discharge of salt. If the facility does not meet this requirement, the facility will be required to submit a
<br />salinity report documenting that achieving this level of discharge is not feasible. See Regulation 61.8(2)(1) for more information.
<br />***The phosphorus limitations apply to discharges to the Dillon Reservoir Wateshed, Cherry Creek Reservoir Watershed, Chatfield Reservoir Watershed, and the
<br />Bear Creek Watershed, as defined in Regulation 71, 72, 73 or 74 respectively. The permittee may be required to obtain a phosphorus allocation from the applicable
<br />control regulation authority prior to certification under this general permit.
<br />2. Effluent Limitations – Alkaline Drainage, Coal Preparation Plants and Coal Preparation Plant Associated Areas and Western
<br />Alkaline Coal Mining (additional requirements may apply to Western Coal Mining, See Part I.B.2)
<br />a. Alkaline Mine Drainaee - means mine drainage which, before any treatment, has a pH equal to or greater than 6.0 and
<br />total iron concentration of less than 10 mg/l.
<br />b. Coal Preparation Plants – means a facility where coal is subjected to cleaning, concentrating, or other processing or
<br />preparation in order to separate coal from its impurities and then is loaded for transit to a consuming facility.
<br />c. Coal Preparation Plant Associated Areas - means the coal preparation plant yards, immediate access roads, coal
<br />refuse piles and coal storage piles and facilities.
<br />d. Western Coal Mining Operation - means a surface or underground coal mining operation located in the interior
<br />western United States, west of the 100th meridian west longitude, in an and or semiarid environment with an average
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