Laserfiche WebLink
recent reclamation. Once vegetation is established, the pre-mine curve numbers are then applied. <br /> Appendix 4 lists the mining storm event data for each area. The basin/area numbering <br /> corresponds to the numbering found on Map G-1 —Surface Hydrology: Mining Conditions. <br /> All water that falls on the stabilized surfaces of the WRL will infiltrate through the porous <br /> material of the WRL. All stormwater which falls on the active working lift of the WRL will <br /> infiltrate within the porous working lift within 72 hours. The paired lift and berm configuration <br /> (Figure 8) creates a stormwater containment sump on the active lift behind that lift's stormwater <br /> berm that is greater than the maximum amount(based on 100-YR event) of stormwater that <br /> could fall on the active lift. Map G-2—WRL Surface Hydrology: Typical Waste Embankment <br /> Bench Cross Section shows how this is achieved. Sediment ponds will not be installed at the <br /> WRL toe to allow subsurface drainage. Positive drainage of the WRL during mining and <br /> following reclamation, coupled with 2.2H:LOV final reclamation slope conditions, ensures slope <br /> stability. No diversion structures will be in place along the east or west perimeter of the WRL. <br /> The WRL is designed to safely convey surface water runoff through or across the top of its slope. <br /> Discharge points will be monitored and located as shown on Map G-1 —Surface Hydrology: <br /> Mining Conditions. <br /> Young Ranch Resource <br /> Lewicki&Associates <br /> December 2021 G-4 <br />