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PARTI
<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 />
<br />Monitoring Sample
<br />Parameter 3{}-Day 7-Day Daily Rationales Frequency I Type
<br /> max.
<br /> General Permit Requirements
<br />Flow, MGD Report NA Report Discharge Evaluation Continuous /2
<br />Instantaneous Recorder
<br />In-situ
<br />pH, s.u. N/A NA 6.5-9.0 Water Quality Standards Weekly Grab
<br />Oil and Grease, mg/1 N/A NA 10 State Effluent Regulations Weekly Visual 3
<br /> Federal Effl uent Limitation Guidel ines
<br />Settleable Solids, ml/l Report NA 0.5 Federal ELG Weekly Grab
<br />Settleable Solids, ml/1 * Report NA Report Federal ELG Weekly Grab
<br /> Site Specific Limitations
<br />Total Dissolved Solids, mg/1 *• Report NA Report Salinity Regulations Quarterly 4 Grab
<br />Total Phosphorus (as P), mg/1 *** Report NA Various Control Regulations Monthly Grab
<br />Other Pollutants of Concern
<br />Various NA Various . Water Quality Standards 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 I ton/day or 350 tons/year allowable discharge of salt. If the facility does not met 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(2x1) 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 Drainage - 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 />niactr-rn I miter .States,. west of the 100th meridian west longitude, in an and or semiarid environment with an average
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