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Red Creek Quarry, Groundwater Modeling Analysis <br /> <br /> <br /> <br />10 <br />DRAFT for review purposes only. Use of contents on this sheet is subject to the limitations specified at the beginning of this document. <br />RedCreekQuarry_Modeling_TM_DRAFT_20230911 <br />2.7 MPO Mine Blocks <br />As discussed in Section 1.4, the MPO is divided into 10, 10-year mine blocks incorporating a new open, flat <br />bottom elevation mine block. Each mine block is represented as a drain in the groundwater flow model. This <br />allows for the rate of groundwater in to be estimated for each mine block. As the MPO progresses, previous <br />mine blocks are replaced with an updated hydraulic conductivity to represent backfill material, as discussed <br />in Section 2.4. <br />Each mine block begins with the previous mine block’s ending groundwater heads. The first mine block uti- <br />lizes the steady-state Existing Conditions (EC) groundwater heads. If the bottom elevation of a mine block is <br />above the interpolated water table, no groundwater will enter the pit during the phase. <br />Section 3: Simulation Results <br />3.1 Calibration to Existing Conditions <br />The steady-state simulated groundwater elevation contours for the EC groundwater flow model are shown in <br />Figure 5. The EC model was calibrated against groundwater elevations measured in site wells in May 2023 <br />and visual Red Creek flow observations from December 2022. Due to the limited aerial extent of the site <br />monitor wells, there is a measure of uncertainty introduced with the interpolated water table due to lack of <br />measured groundwater data in the central, southern, and eastern portions of the site. Groundwater flow is <br />generally to the northeast towards the Arkansas River. <br /> <br />