2025-02-13_REVISION - M2020007 (6)

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EXHIBIT G WATER INFORMATION(CONT) enough unlined areas crossing thru the lined reservoirs to allow for some increase without impacting surface features . In the eastern area groundwater averages 12 feet below the surface, there are numerous, gaslines and road corridors that would allow ground water to bypass the lined areas . The mining operation will have minimal effect on the South Platte River in the form of minor groundwater depletions due to evaporation and water uses associated with mining. The depletions to the South Platte will be mitigated thru a temporary Substitute Water Supply Plan (as required and approved by the Division of Water Resources) to prevent injury to the vested senior water rights . The reclamation plan proposes the creation of 8 (or fewer) slurry wall lined reservoirs that will not be hydraulically connected to the South Platte River or any alluvial aquifer. The Mining Plan includes four (4) unlined pits that will be backfilled with excess overburden and wash fines from the sand and gravel processing plant . The reservoir phases will be sealed prior to mining, thereby eliminating the groundwater drawdown which is typically associated with mine site dewatering. This will also eliminate or minimize the possibility of any adverse impacts to nearby alluvial wells . If during the course of mining or reclamation complaints from a well owner are received by the permittee, the permittee will commence an evaluation and investigation, including providing replacement water to the well owner if necessary, within 48 hours . DRMS shall be notified within two business days of the complaint and the proposed initial steps for the evaluation of the complaint . A written report will be submitted to DRMS within 30 days detailing the information collected during the investigation of the complaint, and proposed mitigation activity, if required. 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 EXHIBIT D - MINING PLAN) . TABLE G-1 is a list of 16 wells from the Office of the State Engineer' s files, and whose permit locations are within 200 feet of the permit area. (Note: Well permit locations are not always accurate, especially for older wells . ) The wells highlighted in L.G. Everist, Inc. Ragsdale Reservoirs Revised February 11, 2025 38