HYDRO20099 - Laserfiche WebLink

Home Browse Search

YARTI Permit No. CO-0032638 Page Na. 6 A. DEFINITION OF EFFLUENT LIMITATIONS 4. Burden of Proof Requirements The peratittee has the burden of proof when seeking relief from settleable solids (SS) limitations, as applicable. Settleable solids aze primary ]imitations for outfalls 004 and 007. Outfalls 004 and 007 maybe eligible, providing the exceedence is caused by precipitation. a) For rainfall to waive settleable solids limitations, it is necessary to prove that dischazge occurred within 48 hours after precipitation greater than the 10-year, 24-hour event has stopped. b) For snowmelt, to waive settleable solids limitations, it is necessary to prove that dischazge occurred within 48 hours after pond inflow volume greater than the 10-yeaz, 24-hour event has stopped. To claim an exemption in the event of a precipitation event or snowmelt, the pemtittee shall submit adequate proof as an attachment ro the Dischazge Monitoring Report (DMR) for the appropriate period. The pemrittee should endeavor to meet the primary limitations whenever possible. Relief may be granted for each dischazge occurrence only when necessary and shall not be granted when the permittee has control over the dischazge. The permittee will need to show that exceedence of the applicable ]imitations were_ causedby precipitation and no other source and that the dischazge was beyond their control. The Division shall determine the adequacy of proof. As part of this determination, the Division shall evaluate whether the permittee could have controlled the dischazge in such a manner that primary limitations could have been met. The pemrittee needs to demonstrate that surface runoff caused the exceedence of primary limitations. Additionally, the petmittee shall certify that the pond system was properly designed, operated, and maintained before and during the dischazge. Manual dewatering of ponds that have no automatic dewatering devices must occur within 48 hours after event end as described in the above paragraphs to be eligible. All manual dewatering that occurs after 48 hours shall meet settleable solids limitations as applicable. 5. Post-Minine Areas Commencing at the time active mining has ceased and surface azeas have been resumed to the required contour all applicable dischazges maybe eligible for limitations other than those specified in Part I.A.1. These post-mining limitations shall remain in effect until bond release. The permittee shall notify the Division upon cessation of active awning so that consideration of appropriate permit modifications can be made. B. MONTTORING REQUIItEMENTS 1. Frequency and Samole Tvae In order to obtain an indication of the probable compliance or noncompliance with the effluent limitations specified in Part I.A.1, the pemilttee 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 Dischazge Monitoring Report form (See Patt I.E.). Also see Part I.B.2. a. Outfalls 004 and 007 man }~Paratneter a +. ~' ~`` ~ .~ ` Moni}'orm rFre u`enc S lei` ~ .,~~~,:. ~, .:,; ~.~_.a_ ~A~w t ~~ ~..~_ .~_~,.- :, ..~.. _ _. g.. ,s. _ .y.n~hw ~~ . ,~ Flow (Effluent), MGD a Weekly Instantaneous or Continuous Flow Ratio (Combined Effluent to Upstream Trout Weekly Calculation Creek) ISSUED: September 22, 2003 EFFECTIVE: September 22, 2003 EXPIRES: February 28, 2006 See Part I.C. for Definitions.