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tered, they will be covered with topsoil from the stockpiles to the same depths outlined in the recla- <br />mation plan and no more mining will occur in this area. <br />United commits to clearly marking the permit boundary at all corners. <br />2. Mine Facilities <br />There will be no permanent mine facilities on site. There will be no office of any kind, no lighting, <br />no fuel storage area, no cement plants, no asphalt plants, no truck scale or power poles , no crushing <br />and screening equipment or any other type of equipment. The raw gravel from this site will be <br />loaded into trucks from a front end loader and the gravel will be hauled over the temporary bridge <br />across the river, where the material will be processed at the River Bottom Pit facilities. All trucks <br />leaving the site will use the existing entrance on Highway 133. <br />3. Bride Facility and River Crossing <br />The raw mined material must be brought from the permit area south of the river to the River Bottom <br />Pit north of the river. In order to minimize problems with sedimentation of the river, fish habitat, <br />recreational use of the river and other potential problems, a portable bridge has been selected over <br />the other options of large culverts or a low water crossing. This option is more expensive for United <br />but is much better for all items of concern. <br />The portable bridge will consist of two 89 feet wide flat railcars joined together and each supported <br />by two pre-cast concrete supports. The supports will be 8' wide x 3' x 11' high pre-cast concrete for <br />each railcar deck. These supports will be buried a minimum of 1 foot into the existing bed of the <br />river channel. A minimum of 6.0 height will be maintained for normal year peak flows from the <br />water level to the lowest point on the bridge. A diagram of this installation is shown on Map E-4. <br />The bridge will only be in use during low water conditions on the river, from July 1 to March 30 of <br />each year. Ramps of approximately 12% grade will be made on both river embankments for the <br />truck routes. A gravel embankment will also be built up on the north side of the bridge as shown on <br />Map E-4 so that the trucks have any easy path to follow. This gravel berm will be removed over a <br />40 feet width at the end of each mining season in preparation for the subsequent year's peak flows. <br />This allows two full paths for river water in peak flow: within the 75 feet wide span and in a 40 feet <br />wide opening in the gravel berm. During a very large peak flow, portions of the gravel berm may <br />North Fork Pit Mazch 04 17 <br />