2022-11-18_PERMIT FILE - M2022048 (5)

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MINING PLAN AND TIMETABLE EXHIBIT D(CONT) Please refer to the MINING TIMETABLE for the estimated acreage of each area associated with the mining part of this operation. Mining equipment may include but is not limited to, front-end loaders, scrapers, excavators, a drag line, dozers, off-road haul trucks, dump trucks and a water truck. Most of the water used on site will be for dust control used on haul roads or with sand and gravel processing. Please refer to EXHIBITG-WATER for the discussion of how water will be used at the site, the estimated yearly needs, and the source (s) of said water. Prior to mining into the groundwater table, the appli- cant/operator/permittee will obtain a Substitute Water Supply Plan approval from the Division of Water Resources . All interior pit slopes will be maintained, when actively mining, with a pit-ward attitude to prevent off-site stormwater runoff. The general slope of reclaimed areas will be graded in a similar way so that stormwater drains into the site, not out . This same slope management plan will prevent any offsite erosion or other disruptions . In addition to the pit and reclamation sloping, isolation berms or ditches will be constructed around the mine as needed to prevent off-site stormwater from contacting the on-site disturbed areas . All stormwater contacting the dis- turbed area will be retained on-site to be discharged as part of the Colorado Discharge permit or allowed to evaporate or soak into the underlying gravel . The applicant had a jurisdictional delineation of the site conducted by environmental consultants and submitted to the U.S. Army Corps of Engineers (USACE) . The Corps has determined that there are no jurisdictional wetlands on the West Farms site. The Corps determined that irrigation return flow ditch on the west side of Phases 1 and 2 is jurisdictional and must remain. So the ditch may be slightly improved by defining its course, but it will remain and not be impacted by the mining operation. If the irrigation ditch dries up once the area is no longer irrigated, the applicant may request a change in status (for the ditch) from the Corps . MINING TIMETABLES This estimated mining timetable is based on an average year, and L.G. Everist expects some years to vary widely from the aver- age. If there are changes in the mining timetable, we will dis- L.G. EVERIST, INC-WEST FARM RESERVOIRS November 2022 14