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Red Creek Quarry, Groundwater Modeling Analysis <br /> <br /> <br /> <br />5 <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 />Section 2: Model Construction <br />2.1 Modeling Codes and Discretization <br />Groundwater flow was simulated using MODFLOW 2005 (Harbaugh, 2005). Each MPO mine block simulates <br />a period of 10 years of groundwater flow. The model domain was extrapolated from the Holcim mine plan <br />Leapfrog model to approximately one mile outside of the site boundary to prevent potential boundary effects <br />at the edges of the groundwater flow model interfering with projected MPO impacts. Figure 3 illustrates the <br />RCQ site and the model domain extent. The grid spacing consists of a 1,000-foot by 1,000-foot grid size at <br />the edges of the model telescopically refined to a minimum of 25-foot by 25-foot grid along Red Creek. <br /> <br /> <br />