2011-11-30_PERMIT FILE - C1981008 (5)

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PART I Page No, 17 Permit No.: CO-0000213 2) Move to a TRE by identifying the necessary control program or activity and proceed with elimination of the toxicity so as to meet the WET effluent limit. If toxicity spontaneously disappears in the midst of aTIE, the permittee shall notif}, the Division within 10 days of such disappearance, The Division may require the permittee to conduct accelerated testing t, to demonstrate that no pattern of toxicity exists, or may amend the permit to require an increased frequency of WET' testing for some period of time. If no pattern of toxicity is demonstrated through the accelerated testing or the increased monitoring frequency, the toxicity incident response will be closed and normal WET testing shall resume. The control program developed during a TRE consists of the measures determined to be the most feasible to eliminate WET. This may happen through the identification of the toxicant(s) and then a control program aimed specifically at that toxicant($) or through the identification of more general toxicant treatability processes, A control program is to be developed and submitted to the Division within 180 days of beginning a TRE. Status reports on the TRE are to be provided to the Division at the 60 and 120 day points of the TRE investigation. I ftoxicityspontaneo-usly disappears in the midst of TRE, the permittee shall notify the Division within 10 days of such disappearance. The Division may require the permittee to conduct accelerated testing to demonstrate that no pattern of toxicity exists, or may amend the permit to require an increas&d frequency for some period of time, lfrio pattern oftoxicityis demonstrated through the accelerated testing or the increased monitoring frequency, the toxicity incident response will be closed and normal WLT testing shall resume. d- Toxicity Reopener This permit may be reopened and modified to include additional or modified numerical permit limitations, new or modified compliance response requirements, changes in the WFT testing protocol, the addition of both acute and chronic WET requirements, or any other conditions related to the control of toxicants. S. Storm Exemption - Facilities Permitted to Dkeharge If the permittee intends to use the I 0 -year, 24-hour storm exemption, a report must be submitted to the Division within 90 days after the effective date of this permit, documenting that the facility is designed, constructed and will be maintained to contain or treat: a The maximum volume of wastewater which would be generated by the facility during a 24-hour period without an increase in volume from precipitation; and b. The maximum volume orwastewater resulting from a 10-year, 24-hour precipitation event, including the volume which would result from all areas contributing runoff to the individual treatment facility (i.e., all runoff not diverted from the active mining area or the mill area). in addition, if a discharge occurs as a result of the 10 -year, 24 -hour storm volume being exceeded and the permittee wishes to claim an exemption from technology based effluent limitations, the permittee shall submit, within 5 days of the said dischw-C, z documentation that the facility was maintained to contain or treat the previously specified volumes. The permittee must also submit documentation of the storm event, including the precipitation recorded at the closest official precipitation gauge Z, station (or the permittee':, own gauge), the volume of runoff produced and the steps taken to maintain treatment and minimize the amount of overflow. For claiming a storm water exemption, the permittee must also adequately demonstrate that all reasonable management, containment, and treatment options have been op:imally utiliztd. Tice storm event exemptions are only applicable for the following parameters at this facility, which are based upon Federal BAT,!BPT limitations: