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the same location. The post mine discharge is less than the pre-mine discharge. The velocity of <br /> the post mine flow is <5 fps, making it non-erosive. <br /> Table 8. Mine Ramp/Central Road South Discharge. <br /> Pre Mine Discharge Post Mine Discharge <br /> (cfs) (cfs) <br /> 229.0 41.1 <br /> Each side of the mine ramp will act as a large shallow sump and detention pond. This will allow <br /> storm water to collect on either side of the mine ramp and then flow naturally towards the <br /> discharge point on either side of the mine ramp. <br /> Groundwater <br /> Expected groundwater levels are known to be greater than 500 feet below the pre-mined ground <br /> surface based on well and spring data in the surrounding area. Well data is further detailed in <br /> Appendix 3 of this application. No known aquifers exist within the deposit to be mined, and <br /> there are no water rights associated with it. No non-tributary,not non-tributary, or tributary water <br /> rights are fed by groundwater flows from this site. See the Aquatic Resource Delineation in <br /> Appendix 7 for additional information regarding tributary water on the site. <br /> South of the site, Clear Creek is—500 feet lower than the lowest pre-mined surface at the quarry. <br /> The North Fork of Clear Creek to the north of the site is —600 feet lower than the Phase 1 and 2 <br /> processing area surface. However, in the very unlikely event that groundwater is encountered <br /> during mining, excavation will immediately stop and the area will be backfilled with at least 2 <br /> feet of overburden type material to cover any exposed water. No pit dewatering will take place as <br /> the groundwater table is below the bottom of the quarry elevations (pre-mine and post-mine) <br /> shown on Maps C-1 and F-1. Map G-3 shows cross of the mining area and the elevation of <br /> groundwater based on well data. <br /> According to searches on the Division of Water Resources (DWR) database, there are 3 <br /> sampling and monitoring wells permitted within 600 feet of the Young Ranch Resource permit <br /> boundary. These monitoring wells have a permit but do not have construction or any other <br /> Young Ranch Resource <br /> December 2021 G-8 Lewicki&Associates <br />