2021-12-29_PERMIT FILE - M2021009 (6)

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Ungraded Bench Face Min.Width=86' I Ungraded Bench Face Runoff=24 SF Calc from Rainfall Depth=0 27' Ungraded Bench Face Bench Height=50.0' / f Runoff Capacity=192 SF Calc.with 1'Freeboard(4'deep) Waste embankment face regrading in progress Stormwater Berm Height=5.0' - Regraded waste embankment face. Large broken rock cap acting as riprap. Stormwater infiltration flowpath -Tree planting(typ.)', Figure 8. WRL Bench Construction and Surface Water Control (taken from Map G-2). As the WRL will be reclaimed to similar conditions as present adjacent to the CCP (see Exhibit E for details),the final 2.2H:LOV slope conditions will consist of coarse broken rock slopes with vegetation as tree tubelings, native shrubs, and broadcast seeding amongst the rock covered slope. Currently, the drainage to become the WRL is a LOH:LOV slope composed of road fill topped by coarse blasted rock and volunteer vegetation (Figure 6). The coarse broken rock derived from the quarry will be similar to riprap, like the natural talus slope, and will act as armor for the slopes at this mid-high altitude. Coarse broken rock will be installed according to the specifications shown on Map G-2—WRL Surface Hydrology: Waste Embankment Plan View and as detailed in Appendix 1. It should be noted that D50 rip-rap specifications were chosen to model the WRL's drainage as an effective stand in for the coarse blasted rock from the quarry. Coarse rock sized similar to or greater than the D50 specifications will be used. Since the WRL slope and the adjacent hillsides are acting as a channel for stormwater, the size of capping rock will be larger at the toe of each slope of the WRL than the rock size further up the slope. Figure 9 shows this concept from Map G-1. 1 SEDCAD Reports: WRL Slope Armoring-25'/50'/75' Channel Bottom Young Ranch Resource Lewicki& Associates December 2021 G-5