PERMFILE139795 - Laserfiche WebLink

Home Browse Search

., `.. :. PART I Page No. S PennitNo.: CO-0038342 Should a precipitation event or snowmelt occur, the pemtittee shall submit adequate proof in order for an exemption to be claimed. Weather station data maybe appropriate in making this demonstration. Said proof shall be submitted as an attachment to the Dischazge 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 pemtittee could have controlled the dischazge in such a manner that primary limitations could have been met. All manual dewatering of ponds that aze 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. 4. Post-MininE Areas Ia confomtance with 40 CFR 434.50, commencing at the time active mining has ceased and all surface areas served by a sedimentation pond have been returned to the required contour and revegetation has commenced, applicable dischazges may be eligible for post-mining limitations. In most cases, these post-mining limitations shall remain in effect until bond release. The permittee shall notify the Division at the appropriate time so that consideration of permit modifications can be made. Prior to notification and subsequent permit modification, active mining limitations will apply regazdless of actual mine status. 5. Comnliance Schedules a. Twelve Time Analysis - Outfall 002: The pemtittee shall complete a twelve time analysis as described in Part I.B.3. Twelve consecutive monthly grab samples shall be collected at outfall 002 and analyzed with all results being submitted at the end of the sampling period. A cnmmary report in the form of a letter shall be submitted to the Permits Unit by October 31, 2005. The pemrittee may attach the laboratory results if they choose. This report shall include all sample results collected over the twelve month period. If the series of sampling is incomplete, this shall be noted in the report. If sampling has not yet been completed by October 31, 2005, this twelve time analysis requirement shall continue until twelve samples have been collected and analyzed and the results submitted to the Permits Unit. Monitoring results for the same parameters previously collected (1998 and more recent) maybe substituted for future monitoring results. 6. Chronic WET Testing-Outfa11002 a. Testin¢ and Reportinz Requirements Tests shall be done at the frequency listed in Part I.B.1. Test results shall be reported along with the Discharge Monitoring Report (DMR) submitted for the reporting period during which the sample was taken. (i.e., WET testing results for the fast calendar quarter ending Mazch 31 shall be reported with the DMR due Apri128.) The results shall be submitted on the Chronic Toxicity Test report form, available from the Division. Copies of these reports aze to be submitted to both the Division and EPA along with the DMR The pemrittee shall conduct each chronic WET test in general accordance with methods descnbed in Short Term Methods for Estimating the Chronic Toxiciri of Effluents and Receivin¢ Waters to Freshwater Organisms. EPA/600/4- 89/001 or the most current edition, except as modified by the most current Division guidance document entitled Guidelines for Conducting Whole Effluent Toxicity Tests. The permittee shall conduct such tests using Ceriodapbnia dubia and fathead minnows. b. Failure of Test and Division Notification Beginning on the effective date of the limitation, a chronic WETSest is failed whenever there is a statistically significant difference in lethality between the control and any effluent concenttation less than or equal to the instteam waste concentration (IWC). The IWC for outfall 002 has been determined to be 100%. The permittee must provide written notification of the failure of a WET test to the Division, along with a statement as to whether a Preliminary Toxicity Investigation (PTI)/Toxicity Identification Evaluation (TIE) or accelerated testing is being performed. Notfication must be received by the Division within 21 calendar days of the demonstration of chronic WET in the routine required test. Demonstration for the purposes of subparts.b., c., d., e. and g. means no later than the last day of the laboratory test. c. Automatic Comnliance Schedule Uoon Failure o[ Test If a routine chronic WET testis failed, the following automatic co~rliance schedule shall apply. As part of this, the pemrittee shall either: MDperBP.doc Revised 06/09/04