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b. Dry Rangeland seed mix will be used in the flats of pit floors as well as the flats of the <br /> final reclaimed WRL flat surface. The side slopes (i.e. shoulder) of the central access <br /> road will be graveled with the same material the road is topped with. <br /> c. Tree tubelings and shrubs will be planted on all north and east facing slopes. Please <br /> refer to Exhibit L and Table 1 for additional revegetation acreage details. <br /> d. Refer to the updated Appendix 1 maps for post-mined and final reclamation vegetation. <br /> e. Please refer to map F-1 for all structures to remain in final reclamation. <br /> Exhibit G — Water Information (Rule 6.4.7): <br /> 49. Figure G-1 — Surface Hydrology— Reclaimed Conditions states "quarry floor drains <br /> offsite via road". Please provide additional details on this proposal. According to the <br /> gradients shown, the realigned Central City Parkway will be at a higher elevation <br /> (approximately 50-75 feet higher) than the adjacent quarry floors until it reaches the <br /> southern edge of the quarries. Please provide additional details on the point where the <br /> elevation of the road falls below the elevation of the quarry floors and depict this point on <br /> the figure. Given the proposed steep slopes adjacent to the southern portion of the <br /> realigned road, and the proposed plan to have the two quarries drain to this portion of <br /> the road, how will the road be protected from flooding and erosion damage?Additionally, <br /> how will water draining to the south (through the narrow access corridor) be managed? <br /> Will any culverts or other stormwater control structures be installed in this area? Please <br /> provide additional details in this exhibit and on Figure G-1 to describe how surface flows <br /> will be managed at this proposed "quarry discharge point'. <br /> Discharge from the quarry floor via the mine ramp/haul road is detailed in the revised Exhibit G <br /> and the revised figures of that exhibit. Prior to reclamation, various sumps will be used to store <br /> stormwater in various locations throughout the mine life, see Exhibit C maps for sump locations <br /> through time. During phases 1-4, all stormwater that has not infiltrated within 24 hours will be <br /> pumped to the eastern most low point within the quarry and pumped to the CCP underpass and <br /> ultimately to the WRL. During phase 5 mining and into reclamation, the quarry floor will act as a <br /> general sump where stormwater will exit the site along the southern extent of the central mine <br /> access road (maps F-1 and G-1). The area will be graded to avoid the need of culverts or other <br /> discharge structures. <br /> 50. On page G-2, the application states the entire process area during mine phase 1 will act <br /> as a sump and sediment from the low-lying east area will be removed as needed. The <br /> designed pad elevation will be approximately 3 feet lower than the elevation of the <br /> adjacent Central City Parkway. Please provide a generalized cross-section of this area <br /> during operations, showing the anticipated grade of the top of the processing pad, the <br /> sump area, the modified culvert under the parkway, and the area east of the road where <br /> the culvert will drain. <br /> Please refer to the response to Division question #49 for a narrative description of the phase 1 <br /> drainage plan. A cross section of the phase 1 pad is now shown on the Appendix 1 maps. <br /> 51. On page G-2, the application states surface water will be diverted around disturbed <br /> areas with perimeter ditches and berms. Please provide more details on the stormwater <br /> management plan, including the approximate locations and dimensions of any <br /> stormwater structures/features proposed. Additionally, please ensure any anticipated <br /> December 2021 17 0 Lewicki&Associates <br />