Laserfiche WebLink
2.Mine Facilities <br /> There will be no permanent facilities on site. There will be no office of any kind, no lighting, no <br /> 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 land bridge across <br /> the river,where the material will be processed at the River Bottom Pit facilities. All trucks leaving <br /> the site will use the existing entrance on Highway 133. <br /> 3. Bridge 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 or fish habitat, <br /> transportation of the mined material will be via a land bridge during low water. <br /> The land bridge will only be in use during low water conditions on the river, from July 1 to March <br /> 30 of each year. Ramps of approximately 12%grade currently exist on both river embankments for <br /> the truck routes. There currently is a gravel embankment on the north side of the land bridge as <br /> shown on Map E-4 so that the trucks have any easy path to follow. Usually during April 1 to June <br /> 30 of each year,the land bridge will be unusable due to high water flow which will cover the land <br /> bridge. <br /> The flow handled by the 75 feet wide opening is calculated below: <br /> 6.0 feet height from water to bridge), <br /> Assuming a flow depth of 5.0 feet(still providing g <br /> - a Manning's n of 0.25 <br /> - channel grade of 1.4% <br /> The flow would be 2300 cfs @ approx. 6.0 ft/sec. <br /> Using the same parameters for the 40' opening in the berm,this area would handle 1226 cfs. There- <br /> fore, the combined flow for both areas is 3526 cfs. This is considerably more than the average peak <br /> flow of approximately 2500 cfs. Appendix B has flow data from nearby USGS gages in the North <br /> Fork of the Gunnison River. Since 1997,the highest flow from a gage immediately upstream of the <br /> site was approximately 3250 cfs. <br /> 17 <br /> North Fork Pit March 04 <br />