2023-05-25_PERMIT FILE - M2022048 (10)

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The reclamation plan proposes the creation of 4 slurry wall, lined reservoirs that will not be hydraulically connected to the South Platte River or any alluvial aquifer. The reservoir areas will be sealed prior to mining, thereby eliminating the groundwa- ter draw down which is typically associated with mine site dewatering. This will also eliminate or minimize the possibility of any adverse impacts to the single nearby alluvial well. Potential Water Resource Impacts Ground Water Wells We expect this mining operation will have no or minimal impacts on the prevailing hydrologic balance. Sand and gravel mining related impacts to groundwater wells near the pit will be mitigated through the installation of slurry walls around the perimeter of new reservoir mining phases prior to the start of dewatering in each reservoir Phase (see EXHIeITD-MINING PLAN) . TABLE G-1 WATER WELLS WITHIN 200 FEET is a list of 12 wells from the Office of the State Engineer' s files that are located within 200 feet of the permit area. (NOTE: THE WELL PERMIT LOCATION SHOWN IN THE TABLE HAVE BEEN GPS LOCATED BY THE STATE ENGINEERS OFFICE S AND GROUND VERIFIED) . All wells except the geothermal well (Blue highlight) are shallow wells, at this time, there is one shallow well within 200 feet of the permit area that is not owned by L.G. Everist, Inc. The Palombo domestic well is located near the southwest corner and is up gradient from the mining area. LGE owns the 8 wells listed for Norgren Farms and is in the process of filing a name change. There are 2 monitoring wells along WCR 32 . 5 owned by Metro Wastewater Reclamation District, the eastern most one is more than 600 feet from the permit line. Prior to exposing groundwater or installing a slurry wall liner in any Phase, a well survey will be performed on any shal- low wells within 200 feet of the phase. Wells that are located within 200 feet of the permit area, that do not need to be tested are (a) owned by L.G. Everist, Inc. , (b) monitoring wells, (c) deep wells, because deep wells will not be affected by potential surface impacts due to mining. L.G. Everist will attempt to obtain for each shallow well to be tested the following data: • Basic Well construction data that is currently available. • Total well depth • Depth to static water level, • Depth of pump intake • Conduct pump test to determine well yield (subject to DWR Regulations) • Conduct analytical sampling of all Domestic Drinking Water parameters for any residential wells . L.G. EVERIST, INC. -WEST FARM RESERVOIRS May 2023 29