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Table 2: Measured and Modeled Site Groundwater Levels <br /> Well Observed Modeled Difference Cell(IJK) <br /> PZ-01 4,712.93 4712.32 -0.61 146,111,1 <br /> PZ-04 4,712.60 4712.44 -0.16 136,119,1 <br /> PZ-09 4,723.90 4725.36 1.46 142,136,1 <br /> PZ-15 4,723.89 4724.4 0.51 153,136,1 <br /> PZ-20 4,737.52 4737.8 0.28 162,133,1 <br /> PZ-25 4,733.10 4733.1 0.00 162,115,1 <br /> PZ-27 4,741.33 4741.2 -0.13 148,122,1 <br /> BBA-MW4 4741 4740.3 -0.70 148,122,1 <br /> BBA-MW11 4737 4736.9 -0.10 148,122,1 <br /> BBA-MW17 4735 4734.4 -0.60 166,164,1 <br /> BBA-MW18 4738 4737.25 -0.75 148,122,1 <br /> 6.2 Slurry Wall Installation Simulation <br /> The Site is planned for a sequence of soil bentonite slurry wall lined cells encompassing the majority of the Site.The <br /> only area not planned to be slurry wall lined is the siltation and freshwater ponds along the eastern edge of the site <br /> parallel to Highway 60. The slurry walls will be constructed in stages starting in the south and progressing north. In <br /> order to model for the worst-case scenario with no mitigation,the model simulates the full buildout of all the sites slurry <br /> walls and filling in the siltation and freshwater ponds with waste material of a lower hydraulic conductivity. To make the <br /> slurry wall lined cells no flow areas,the horizontal hydraulic conductivity of these areas were set to zero(0)feet/day.The <br /> area where the Western Mutual Ditch runs through the Site remained at the 470 feet/day horizontal hydraulic <br /> conductivity. The horizontal hydraulic conductivity for the siltation and freshwater ponds was set to 75 feet/day to <br /> simulate filling the ponds with site overburden. <br /> The mounding and shadowing for the surrounding properties and wells is described in Table 3 below: <br /> Groundwater Model Report—Monarch DENM Gravel Mine Site -8- January 2023 <br />