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Table 3 <br /> Mininq 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 /> Patrid a House n 47363 47432 6.9 208 4764 161 135,1 <br /> Cline House n 4736.8 47451 83 209 4766 1621321 <br /> Harding House y 47366 4746.0 93 191 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 47470 8.5 15.0 4762 163,1151 <br /> Shape House y 4738.4 47457 73 14A 4760 163,1111 <br /> HS Land and Cattle n 47326 47361 3.5 189 4755 155 1071 <br /> Karbowski Brave House n 4725.5 47245 -1 0 27.5 4752 145,1081 <br /> Schmidt Well NA 4714.4 47096 4.8 234 4733 132 1121 <br /> United Well NA 4712.0 47067 -5 3 41.3 4748 132 126,1 <br /> Owens Well NA 4714.2 47112 -3.0 34.8 4746 132,1331 <br /> Wright House y 47174 4712.2 -5 2 398 4752 135 1321 <br /> Schmidt House n 4718.4 47170 -1.4 31.0 4748 135 135,1 <br /> Smit House y 47188 47184 -0 4 296 4748 135,1361 <br /> Kissler House y 4729.5 4733.3 38 21.7 4755 148 1371 <br /> Woolverton House y 4730.8 47349 41 27.1 4762 150136,1 <br /> Shimon House y 47330 47379 4.9 21 1 4759 154,136,1 <br /> Kern House y 4733.8 47390 51 211 4760 156 1371 <br /> Rainbolt House y 47359 47422 63 228 4765 161,137,1 <br /> Gdcrest Valley HS NA 47370 47407 3.7 53 4746 170,155,1 <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 />