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Permit No. COC -850000 <br />Facility No. COG -850054 <br />Page ib <br />1 - For a minor facility, as determined by the EPA NPDES Permit Rating Worksheet, all weekly monitoring requirements shall be ched to 2 days per month. <br />2 - If power is not availkle, flow may be measured on an instantaneous basis. Major facilities shall monitor flow weekly, minor facilities 2 daysdnth <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 b prescribed if the limitation is based upon discharge to the Colorado River Basin. If the limitation is based upon agriooif protection, <br />the monitoring frequency shall be weekly. <br />• If caused by precipitation within any 24iour period greater than thel0 year, 24 hour precipitation event (or snowmelt of equivalent volume) <br />Other Conditions <br />Antidegradation <br />Antidegradation review does not apply to this permit because limitations based on Water Quality Standards are not applied in this <br />certification. <br />Groundwater Contamination <br />If groundwater contamination is encountered then the permittee is to contact the Division, cease all discharges, and if appropriate, <br />contact the owner of the collection system receiving the discharge.Since the discharge of contaminated groundwater is not <br />covered under this permit, the permittee shall immediately apply for a groundwater remediation certification, which will include <br />appropriate requirements for additional discharge monitoring and on-site environmental response capabilities. <br />Sampling <br />Sampling shall occur at a point after treatment, or after the implementation of any Best Management Practices (BMPs). If BMR or <br />treatment are not implemented, sampling shall occur where the discharge leaves control of the permitee, and prior to entering the <br />receiving stream or prior to discharge to land. Samples must be representative of what is entering the receiving stream. <br />_Monitoring and Reporting <br />Discharge Monitoring Reports (DMR) must be submitted quarterly as long as the certification is in effect. The permittee shall provide <br />the Division with any additional monitoring data on the permitted discharge collected for entities other than the Division. Tiis will be <br />supplied to the Division within 48 hours of the receipt of the data by the permittee. <br />Best Management Practices <br />The permittee shall implement and maintain the Best Management Practices (BMP) for the prevention of erosion and the controlof <br />solid and liquid pollutants due to the discharge. BMPs include various options, such as: modification of the pipe discharge structure to <br />disperse flows; containment of water by hay bales or other comparable structures; the use of geocloth, filter fabric, or platic sheeting <br />for protection of containment structures; rip -rap; and/or any other approved methods. <br />The General Permit for Coal Mining is attached and the permittee should review this permit for familiarity with all of the permit <br />requirements. If the permittee has questions related to this certification that cannot be answered by a review of the permit,the permit <br />writer should be contacted. <br />Permit Writer <br />Maura McGovern <br />303-692-3392 <br />April 15, 2010 <br />