2009-03-06_PERMIT FILE - C1981012A (6)

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PARTI Page No. 17 Permit No.: CO-0000906 Should a precipitation event or snowmelt occur, the permittee shall submit adequate proof in order for an exemption to be claimed. Weather station data may be appropriate in making this demonstration. Said proof shall be submitted as an attachment to the Discharge Monitoring Report (DMR) for the appropriate period. The Division shall determine the adequacy of proof. As part of this determination, the Division shall evaluate whether the permittee could have controlled the discharge in such a manner that primary limitations could have been met. All manual dewatering of ponds that are equipped with automatic dewatering systems must meet TSS and total iron limitations. If a pond has only manual dewatering capability, relief is available only to the extent required to regain necessary stability and capacity. B. MONITORING REQUIREMENTS 1. Frequency and Sample Tvae In order to obtain an indication of the probable compliance or noncompliance with the effluent limitations specified in Part I.A.1, the permittee shall monitor all effluent parameters at the following frequencies. Such monitoring will begin immediately and last for the life of the permit unless otherwise noted. The results of such monitoring shall be reported on the Discharge Monitoring Report form (See Part I.E.) If the permittee, using the approved analytical methods, monitors any parameter more frequently than required by this permit, then the results of such monitoring shall be included in the calculation and reporting of the values required in the Discharge Monitoring Report Form (DMRs) or other forms as required by the Division. Such increased frequency shall also be indicated. a. Outfalls 001 A 001 B 001 C 009A 009B and 009C Effluent Parameter Frequency Sample Tvce • Flow, MGD Coninuous* Recorder* Total Suspended Solids (TSS), mg/l 2 Days/Month Grab pH, s.u. (minimum-maximum) 2 Days/Month In-situ Oil and Grease, mg/I 2 Days/Month Visual Iron, Total, µg/I 2 Days/Month Grab Total Ammonia as N, mg/l 2 Days/Month Grab Electrical Conductivity, dS/m 2 Days/Month Grab Sodium Adsorption Ratio 2Days/Month Calculated** Calcium, mg/I 2 Days/Month Grab Magnesium, mg11 2 Days/Month Grab Sodium, mg/1 2 Days/Month Grab Bicarbonate, mg/1 2 Days/Month Grab Whole Effluent Toxicity, Acute (009A, 009B, 009C) Quarterly Grab Whole Effluent Toxicity, Chronic (001A, OOIB, 001C) Quarterly 3 Grabs / Test * Flow measurement may be done on an instantaneous, weekly basis, until such time that mine dewatering begins. ** The equation to calculate the Sodium Adsorption Ratio is further defined in Part I.C. Definitions. Self-monitoring sampling by the permittee for compliance with the monitoring requirements specified above shall be performed at the following location(s): 001A - at the discharge from Pond 1 and prior to commingling with the Middle Fork of the Purgatoire River; 009A - at the discharge from the mine portal and prior to commingling • with the Left Fork of Apache Canyon Creek. b. Outfalls 004A. 007A and 008A