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Table 3 <br /> Minin-q Groundwater Level Table Slu Walls In-Place <br /> After Slurry Surface <br /> Basement Wall Difference(FT Groundwater Depth Elevation <br /> Location /n Baseline Construction Rise or Fall) Below Surface Goo le Earth Cell IJK <br /> Patnd a House n 47363 47432 69 208 4764 161 135,1 <br /> Cline House n 4736.8 4745.1 83 20.9 4766 1621321 <br /> Harding House y 4736.6 4746.0 93 19.1 4765 161 1291 <br /> Wiedeman House <br /> 13434 n 47382 47473 91 20.7 4768 163 121,1 <br /> Wiedman House 13218 n 4738.5 4747.0 85 15.0 4762 163,115,1 <br /> Sharp House y 47384 47457 73 144 4760 163,111,1 <br /> HS Land and Cattle n 47326 4736.1 35 18.9 4755 155 1071 <br /> Karbowski Brave House n 4725.5 47245 -1 0 27.5 4752 145,1081 <br /> Schmidt Well NA 47144 47096 48 234 4733 1321121 <br /> United Well NA 4712.0 4706.7 -5 3 413 4748 132 1261 <br /> Owens Well NA 47142 47112 -3 0 348 4746 132 1331 <br /> Wright House y 47174 47122 -5.2 398 4752 1351321 <br /> Schmidt House n 47184 47170 -1 4 310 4748 135 135,1 <br /> Smit House y 4718.8 47184 -0 4 29.6 4748 1351361 <br /> Kissler House y 47295 4733.3 3.8 217 4755 1481371 <br /> Woolverton House y 47308 47349 41 271 4762 1501361 <br /> Shimon House y 47330 47379 4.9 21 1 4759 154 1361 <br /> Kern House 4733.8 4739.0 51 21 1 4760 156 1371 <br /> Rainbolt House y 4735.9 47422 63 228 4765 161 1371 <br /> Gilcrest Valley HS NA 47370 4740.7 3.7 53 4746 170,1551 <br /> As noted in the table above, groundwater elevation impacts from the installation of the slurry walls will be highly spatially <br /> variable. The southeast comer of the Site is expected to see the most amount of mounding, up to 9.4 feet above <br /> baseline levels. However, the groundwater table in this area is very deep(from 27 to 30 feet deep),so flooding is not <br /> expected to be an issue. Mounding decreases on the upgradient side from east to west,with the Sharp house on the <br /> southwest comer of the Site potentially seeing 7.3 feet of mounding. Elevation from Google Earth for the Sharp property <br /> is approximately 4760 feet which would put the potential groundwater rise at fourteen (14.4)feet below the surface. <br /> Potential shadow effects from the slurry wall are present north of the Site(downgradient). There are three(3)wells on <br /> the north side of the Site which will be in the groundwater shadow and changes in depth to groundwater vary from three <br /> (2)feet lower to five(5)feet lower for the United well. The shadow effect is likely mitigated by the proximity of the slough <br /> to the north of the Site and the infiltration ponds to the northeast of the Site. The modest shadow effect should have <br /> limited effect on the productivity local alluvial wells. <br /> The Town of Gilcrest is located between the Site and a rise in the bedrock elevation to the east which acts as a no flow <br /> boundary. It is anticipated that slurry wall construction will restrict flow to the west of Town causing elevated <br /> groundwater levels in Town as noted for"Gilcrest Valley HS"in the table above. <br /> 6.2.1 Monarch Mountain Minerals and Aggregates Site Impacts <br /> In addition to the Section 20 Gravel Mine,the Monarch Mountain Minerals and Aggregates(MMMA) Monarch DENM <br /> Gravel Mine is permitted by the DRMS on the west side of Highway 60. This site is comprised of four(4)slurry wall lined <br /> cells and three (3)unlined cells along Highway 60. To simulate the four(4) lined cells,the horizontal hydraulic <br /> conductivity in these areas was set to zero(0). To simulate the end stage of the mine it was anticipated that the <br /> Groundwater Model Report-Section 20 Gravel Mine Site -8- August 2022 <br />