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Page 14 <br /> <br /> <br />cultivated portion of the project area associated with the wetlands (Appendix E). <br /> <br />Based on the Minnesota Hydrogeologic Atlas, the water table is mapped within 0 to 50 feet of <br />the soil surface. The water table is shown within ten feet of the surface throughout the lower <br />cultivated field. Most of the project area is within 10 to 40 feet of the soil surface (22). The water <br />table elevation is estimated to be between 840 and 880 ft. MSL (22). Groundwater was <br />encountered in five of the soil borings while drilling and sampling at depths ranging from 12.5 to <br />55 feet below the ground surface corresponding to elevations of about 844 and 870 ft. MSL. The <br />observed water levels are summarized in Table 15. <br /> <br />Table 15. Groundwater Levels Encountered During Geotechnical Exploration and <br />Piezometer Water Level Readings <br />Boring <br /># <br />Measured <br />Ground <br />Surface <br />Elevation <br />Approx. <br />Depth <br />to GW <br />(ft.) <br />Approx. <br />GW <br />Elevation <br />(ft.) <br />Piezometer Water Level Readings (ft.) <br />February 10th, 2025 April 22nd, 2025 <br />Approx. <br />Depth <br />to GW <br />Approx. <br />GW <br />Elevation <br />Approx. <br />Depth <br />to GW <br />Approx. <br />GW <br />Elevation <br />SB-1/ <br />P-1 <br />898.71 55.0 844.0 47.0 852.8 43.5 856.3 <br />SB-2/ <br />P-2 <br />882.41 20.0 861.5 19.4 864.3 19.7 863.9 <br />SB-3 893.1 --2 N/A N/A N/A N/A N/A <br />SB-4 890.4 --2 N/A N/A N/A N/A N/A <br />SB-5/ <br />P-5 <br />893.31 25.0 896.29 20.0 871.5 19.8 876.5 <br />SB-6 882.4 12.5 870.0 N/A N/A N/A N/A <br />SB-7 880.0 --2 N/A N/A N/A N/A N/A <br />SB-8 885.1 30.0 855.0 N/A N/A N/A N/A <br />SB-9 884.4 --2 N/A N/A N/A N/A N/A <br />SB-10 877.2 --2 N/A N/A N/A N/A N/A <br />SB-11 890.9 --2 N/A N/A N/A N/A N/A <br />SB-12 891.5 --2 N/A N/A N/A N/A N/A <br />SB-13 896.1 --2 N/A N/A N/A N/A N/A <br />SB-14 896.5 --2 N/A N/A N/A N/A N/A <br />SB-15 886.3 --2 N/A N/A N/A N/A N/A <br />1 Piezometers were placed in P-1, P-2, and P-5. The pipes were remeasured to check for settlement. Piezometer pipe P-5 <br />settled; therefore, the water level was referenced to the top of the steel protector pipe. <br />2 Not encountered <br /> <br />The project area is not within a wellhead protection area (WHPA) (19). The Minnesota <br />Department of Health (MDH) has identified a wellhead protection area north of the project area <br />(Elk River) and west of the Mississippi River (Otsego East). The WHPAs correspond to two <br />Drinking Water Supply Management Areas (DWSMA) (Elk River; 1710004 & Otsego East; <br />1860026). <br /> <br />The Minnesota County Well Index documents 169 wells within one mile of the project area. Of