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.. Part 1 .. - ... - i -' Page \o. 3 . - - _-. - Permit Nu.: Cb-OW?6:1g PART I .. - A. TERMS AND CONDITIONS . .. ;. . I: . Ffflnent T lmitatinnc . _ . , ~ , _ _ - Beginning no earlier than the effective date of this permit and lasting through January 31, 200f;, the. petmittee is authorized to operate under the terms and conditions of this permit. Discharges are authorized only from the following speci&c outfalls, as shown on Figure 4 of the Pemtit: Outfall OOIA, which is the discharge to Arequa Gulch From the sedimentation pond located downstream of the Valley Leach Facility (VLF) at monitoring point AG 1.5, which is located approximately 350 feet downstream ofahe sedimentation pond crest, and Outfall OOSB, for qualifying precipitation related discharges from the Valley Leach Facility at a point below Outfa11001 A. [n accordance with the \Vater Quality Control Commission Regulations for Gfthient Limitations (5 CC'R 1002-62) and the Color=ado Discharge Permit System Regulations (S.C.GR. 100?-6I ), the pemtitted discharge-shalt not contain eft~:cat pamrneter concentrations, which exceed the limitations specified below, or exceed the specifed flow limitation. - a.~ ~~~`a t)iccharge" (imitation fin• the \'i F ~~~~ ~ ~ ~ ~ ~ ~ ~ - - ~ -~- .~ Except as allowed under the exemptions described in the sections below, there shall be no discharge from the VL.F, pursuant to federnl effluent guideline regulations at 40 CFR, Pan 440.104.. This limi4tiion does not apply to any flows from the. ground water drainage system underlying the VLF: ~b. Annual Precinitatinn Fermntion Frnm "Nn I~icrhargp" f itnitatinn Ontfall 00SR ~ , ~ ~ ' Pursuant to 40 CFR Part 4-10.104, in the event that the annual precipitation (measured as a 365-day, moving average) . falling on the VLF and the drainage area. contributing surface runoff to the VLF. exc~~cds the annual evaporation (also measuredas a 365-clay moving average), a volume ofwater equal to the difference between annual precipitation falling on the VLF and. the drainage area contributing surface ntnoff to the. facility and the 365-day moving average evaporation may be discharged subject to the.limitations set forth in Table V[-2'for OutCall 005(3. Verbal notification shalt be given within 24 hours, and written notification shall be submitted to the Division within 5 days of any _ discharge from the VLF that would yuality for this exemption. -. ~ • ~, Stnm_ t FxetnTLOn From Fe~terd Fftlnrm t 'mi ~tiuns -nutfifl OQSR Puntmnt to 40 CF'R, Part 440.131, if, as a result of precipitation, the Valley Leach Facility has a discharge, which violates limitations of 40 CFR Part 440 or water quality standard based limits, the discharge may quality for an .exemption from such limitations if the following conditions are met: i} The facility is dcsigmed, constiucted and maintained to contain the maximum volume of process water stored and contained by the facility during nomtal operating conditions without 1n increase in volume from precipitation and the maximum volume of water resulting from a 10-year, 24-hour precipitation event. In computing the maximum volume of water, which would result front a 10-year, 24-horn precipitation event, the facility must include the volume, which would result from all areas contributing ntnofl'to the Valley Leach Facility (i.e., atl runoff not diverted from the active ore leaching area). ;For the purposes of this permit, the 10-year 24-liour rainfall depth has been determined to be 2.4 inches. - ii) The perntiac`e takes all reasonable steps to minititizc the discharge. iii) Atl notification requiremerris of the permit are complied with, including those listed below. Verbal notification shall be given by fiC&V immediately to the Division upon becoming ae•are of an imminent discharge and no later than 24 hour after the start of any discharge from the Valley (-each Facility that may qualify for the exemption described herein. A report must be submitted within 5 days of the said dischargre, documenting that the .facility was maintained to contain the previously specified volumes. "the permittee must also submit documentation of the skinn event, including results gathered from the precipitatiwt gauge station in close proximity to the VI_F (or the petmitree's overt gauge), the volume of runoff produced and the steps taken ro maintain treatment and minimize thz anivunt vCvvertlow. .