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`~ i Mr. Steve Shuey Division of Minerals & Geology Durango Field Office March 24, 1995 Page 2 A copy of the Summary and Recommendations from the cultural resource survey report submitted to the State Historic Preservation Office is included. The recommendation is that there will be "no adverse effect" to the listed site from the mining operation. There has not yet been a decision made by SHPO as to the disposition of the site within the boundaries of the permit, that is eligible to be included in the National Historic Register. This decision should be rendered within the next thirty days. The operator will commit to not disturbing the designated site with mining activities until an agreement is reached between the property owner and SHPO. PRE-MINING AND MINING PLAN MAPS The wetlands and small pond location has been added to the Exhibit C-1 Map. The hydropower conduit is located within the limit of mining disturbance, approximately three feet below the surface and will be used as the general location for the access route. There currently is a vehicular access route on top of the hydropower conduit, as this was also the location of the abandoned railroad grade. The area of the hydropower conduit may be mined in the future if agreements are reached with the owner of the line to allow this. The Division will be supplied with a copy of that agreement prior to any excavation of the area containing the hydropower conduit. MINING PLAN Prior to surface disturbance activities, this operation is required to obtain a Stormwater Discharge Permit from the Colorado Department of Public Health and Environment. This permit requires the development of a Stormwater Management Plan which incorporates structural and non-structural Best Management Practices (BMPs) to protect the quality of any Stormwater discharge from this site. The structural components of this plan during mining activities may include, but not be limited to silt fencing, straw bale barriers, erosion prevention/control ditches, and site grading. The non- structural controls used will include revegetation and mulching of areas recently seeded prior to plant establishment. A copy of this approved permit will be forwarded to the Division when it is received. As stated in Exhibit G, wash waters could be used to produce concrete aggregate. The quantity of wash waters needed will be determined by the amount of concrete aggregate decided to produce. If this related activity occurs on-site, wash waters will be recycled through a series of two or three small sediment ponds, sized to accommodate the quantity of water required. All the wash waters used will either be recycled or retained in the washed material and transported off-site with that material. There will be no discharges of the product wash waters allowed, therefore, no NPDES permit is required.