2008-03-24_GENERAL DOCUMENTS - M2003016 (2)

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APPENDIX B - STORMWATER MANAGEMENT PLAN (SWMP) 9/97/sg In this document, the text in bold italics is quoted directly from the Sand and Gravel general permit. The text in straight type is provided as guidance in the preparation of your SWMP. The requirement to develop a stormwater Management Plan (SWMP) prior to application for the general pemut applies to all facilities. The applicant shall develop a SWMP for their facility, and certify in Item 8 of the application that it has been completed. The SWMP shall be prepared in accordance with good engineering practices. (The plan need not be completed by a registered engineer.) 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 mining activity. 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 mining activity. BMPs are defined as physical, structural, and/or managerial practices that, when used singly or in combination, prevent or reduce pollution of water. Mining operations must certify the rnmpletfon of their SWMP, as described in this document. Implementation of the plan will be required at the time that coverage under the general permit begins. The Division reserves the right to request and review the plans, and to require additional measures to prevent and control pollution, as needed. When preparing your plan, make sure to address each item If it is not applicable to your site, briefly explain why. A simple "Not Applicable" is not enough. Also note that the SWMP should include any existing stormwater controls at your site, not just new or proposed ones. Take full credit for what you are already doing. The SWMP shall include the following items, at a minimum: 1. Site Map The plan shall provide a site map or maps which indicate at a minimum: - Mining site boundaries - Access and haul roads - stormwater outfalls and an outline of the drainage area of each stormwater outfall - Au estimate of the direction ofjlow - Materials handling areas - Each existing s[ructural control measure to reduce pollutants in stormwater runoff - Areas used for storage or disposal of overburden, materials, soils or wastes - Areas used for mineral milling and processing - Springs, streams, wetlands and other surface waters - Location ojmine drainage or any other process water - Boundary of tributary area that is subject to effluent limitations - Date the map was prepared The drainage areas shown should include the portions of the site where industrial activities occur, as well as those portions contributing stormwater that mixes with runofl'from the industrial area. Therefore, the entire drainage area where industrial activities occur must usually be included. Aside from mining, industrial activities can include equipment washing, materials storage, vehicle maintenance or fueling, incineration, waste treatment, storage or disposal, shipping/loading/unloading, etc. You do not need to include industrial activities which only take place indoors, unless there is some part or aspect of the activity with which stormwater could come in contact. For example, if all vehicle maintenance is done indoors, but vehicle storage or fueling is outside, the vehicle storage or fueling area must be addressed.