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The mounding and shadowing for the surrounding properties and wells is described in Table 3 below: <br /> Table 3 <br /> Mininq Groundwater Level Table Slunry 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 4736.5 4743.2 670 208 4764 161 135,1 <br /> Cline House n 47371 47448 770 21.2 4766 162 1321 <br /> Harding House y 1 47369 47457 880 193 4765 161 129,1 <br /> Wiedeman House <br /> 13434 n 47384 47469 8.50 211 4768 163,121,1 <br /> Wiedman House 13218 n 47386 47467 810 153 4762 163115,1 <br /> Sharpe House y 47385 4745.3 6.80 147 4760 163,111,1 <br /> HS Land and Cattle n 47327 4735.0 2.30 20 4755 155,107,1 <br /> Karbowski Brave House n 47257 47251 -0 60 269 4752 1451081 <br /> Schmidt Well NA 4714.6 4710.6 400 224 4733 132,112,1 <br /> United Well NA 47123 47070 -5 30 41 4748 132,126,1 <br /> Owens Well NA 47147 47128 -1 90 332 4746 132 133,1 <br /> Wright House y 47180 47133 467 387 4752 135,132,1 <br /> Schmidt House n 4719.2 4718.0 -1 22 3002 4748 135135,1 <br /> Smit House y 47196 47194 -0 20 286 4748 1351361 <br /> Kissler House y 4730.2 4734.2 4.00 208 4755 148 137,1 <br /> Woolverton House y 47314 47360 460 26 4762 150 1361 <br /> Shimon House 47336 4738.6 5.00 204 4759 154136,1 <br /> Kern House 7344 4739A 500 206 4760 156 1371 <br /> Rainbolt House y 4736.4 4742.3 590 227 4765 161,137,1 <br /> Gilcrest Valley HS NA 47378 47418 400 42 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 corner of the Site is expected to see the most amount of mounding, up to 8.5 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 corner of the Site potentially seeing 6.8 feet of mounding at full build out. Elevation from Google Earth for the <br /> Sharp property is approximately 4760 feet which would put the potential groundwater rise at fifteen (14.7)feet below the <br /> 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 two <br /> (2)feet lower to over five (5)feet lower for the United well. The shadow effect is likely mitigated by the proximity of the <br /> slough to the north of the Site and the infiltration ponds to the northeast of the Site. The modest shadow effect should <br /> have 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. See Figure 6 for groundwater contours. <br /> Groundwater Model Report—Section 20 Gravel Mine Site -8- August 2022 <br />