2008-09-19_PERMIT FILE - C1981018A (2)

Home Browse Search

PART II Page No. 10 Permit No.: CO-0038024 If deemed appropriate by the Division, the permit or the compliance schedule maybe modified to revise the ongoing • monitoring and toxicity investigation requirements to avoid an unproductive expenditure of the permittee's resources, provided that the underlying obligation to eliminate any continuing exceedance of the toxicity limit shall remain. £ Spontaneous Disappearance If toxicity spontaneously disappears at any time after a test failure, the permittee shall notify the Division in writing within 14 days of a demonstration of disappearance of the toxicity. The Division may require the permittee to develop and submit additional information, which may include, but is not limited to, the results of additional testing. If no pattern of toxicity is identified or recurring toxicity is not identified, the toxicity incident response is considered closed and normal WET testing shall resume. g. Toxicity Reopener This permit maybe reopened and modified (following proper administrative procedures) to include new compliance dates, additional or modified numerical permit limitations, a new or different compliance schedule, a change in the whole effluent toxicity testing protocol, or any other conditions related to the control of toxicants if one or more of the following events occur: i. Toxicity has been demonstrated in the effluent and the permit does not contain a toxicity limitation. ii. The PTUTIE results indicate that the identified toxicant(s) represent pollutant(s) that maybe controlled with specific numerical limits and the permit issuing authority agrees that the control of such toxicants through numerical limits is the most appropriate course of action. iii. The PTUTIE reveals other unique conditions or characteristics, which, in the opinion of the permit issuing authority, justify the incorporation of unanticipated special conditions in the permit. •3. Storm Exemation -Facilities Permitted to Discharge If the permittee intends to use the 10-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 of wastewater 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 discharge, 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 station (or the permittee's 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 optimally utilized. The storm event exemptions are only applicable for the following parameters at this facility, which are based upon Federal BATBPT limitations: total suspended solids, total iron, and/or settleable solids. • All data/documentation required by the section which can not be reported on applicable discharge monitoring report forms (DMRs) shall be reported in a letter as an attachment to the DMR. Submittal of documentation of containment, maintenance and precipitation records above does not exempt the permittee from the notification requirements of Part II.A.4. of this permit.