2012-01-05_PERMIT FILE - C1980005 (3)

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PART I Page No. 26 Permit No.: .: CO-0000221 The Stormwater Management Plan (SWMP) for Seneca Mine Complex shall be developed to cover the inactive portions of the mine. The plan shall identify potential sources of pollution (including sediment) which may reasonably be expected to affect the quality of stormwater discharges associated with the inactive mining operation. In addition, the plan shall describe and ensure the implementation of best management practices (BMPs) which will be used to reduce the pollutants in stormwater discharges associated with the inactive mining operation and to assure compliance with the terms and conditions of this permit. Inactive Minine Areas The SWMP shall include the following items for the inactive portions of the site, at a minimum: i. Description of Mining Activities The plan shall provide a narrative description of the mining and associated activities that took place at the site. The narrative description shall report the approximate dates of operation, the total acreage within the mine site and an estimate of the number of acres of disturbed area. A general description of the location of the mining site relative to major transportation routes and communities shall also be provided. ii. Site Map Each plan shall provide a generalized site map or maps which indicate any of the following which may be applicable: - mining/milling site boundaries and access and haul roads; - areas used for storage of overburden, materials, soils, tailings or wastes; - areas used for outdoor manufacturing, storage or disposal of materials; - tailings piles and ponds; - an estimate of the direction(s) of surface flow; - existing structural control measures to reduce pollutants in stormwater runoff; and - springs, streams, wetlands and other surface waters. iii. Stormwater Management Controls Identification of Sources and Best Management Practices The SWMP shall identify potential sources of pollutants at the site and assess the potential of these sources to - contribute pollutants to stormwater discharges associated with mining activities. The SWMP must also describe appropriate Best Management practices (BMPs) to reduce the potential of these sources to contribute pollutants to stormwater discharges. The appropriateness and priorities of controls in the plan shall reflect identified potential sources of pollutants at the mining site. The description of the BMPs shall include: a) Stormwater Diversion: Describe how and where stormwater will be diverted away from potential pollutant sources to prevent stormwater contamination. b) Sediment and Erosion Prevention: Describe practices that will be used to reduce erosion and prevent sediment delivery to State waters. These could include structural (such as silt fences, sediment ponds, drop structures, check dams) and non-structural (such as mulching and revegetation) methods. iv. Comprehensive Inspection The SWMP shall identify qualified personnel that shall inspect designated equipment and mine areas at appropriate intervals specified in the plan, at least twice a year (in the spring and fall). The operator shall keep a record of such inspections. This record shall be made available to the Division upon request and summarized in the Annual Report (see Part I.E.I of the permit). v. Additional SWMP Items for Sites Seeking Permit Termination Additional requirements apply in the event that the permittee wishes to remediate the inactive mine site and terminate permit coverage. The permittee shall notify the Division as to the change in status. Notification shall be prior to the implementation of the remediation work, if possible. The SWMP must be amended to include the following items, prior to implementation of the remediation work (if possible): a) Documentation of Permission: The plan shall include documentation of permission from the land owner, if the remediation work is undertaken by someone other than the land owner.