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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:IV. <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 136.9 lbs/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 4rn 1. icti and Aswimim PHA' <br /> January 2019 GS-2 <br />