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a. Overall slope limit = 79 °. Measured as a single slope from the top of the <br />excavation to the bottom. <br />b. Maximum bench height = 400' <br />4. South slope (north dipping) <br />a. This slope will be limited to the same as the north slope. <br />The south slope will be limited to the same geometry as the north and east slope based on the <br />similarity in the material and local conditions. <br />Each of the slopes above has maximum and minimum listed conditions for their final slopes <br />configuration. Asphalt Paving Co. will adjust bench heights and widths within these limits to <br />create slopes that are aesthetically pleasing in reclamation. Also, internal slopes maintained <br />during mining will vary as necessary to facilitate mining, and to maintain safety standards. The <br />slopes shown on Maps C -3 and F are plan views of the maximums and minimums determined by <br />Brierley, and are used to illustrate the maximum possible build out of the quarry. The final slopes <br />will be much more varied. <br />2. Blasting <br />Seismic measurements are taken each year, and a report of these measurements is provided to <br />Asphalt Paving Co. A copy of the most recent report can be found in Appendix 3. <br />3. North Platform Backfill <br />The North Platform area located above the water tunnel will be backfilled with screened topsoil <br />in final reclamation. The final slope of this screened material will be no steeper than 3H:1 V. <br />Based on tests conducted for the Colorado Dept. of Transportation, this screened topsoil material <br />is a Clayey Sandy Gravel with a maximum dry density of 136.91bs/ft3. Additionally, based on <br />this and the optimal moisture content of 8.2 %, the unified classification we will use for analysis <br />is clayey gravels (GC). Figure U -1 shows the properties of GC material. <br />Ralston Quarry, February 2015 U -2 <br />