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North Oaks Company LLC <br />Project B2402335 <br />August 22, 2024 <br />Page 7 <br />Location <br />Measured Surface <br />Elevation <br />(feet) <br />Measured Depth to <br />Groundwater <br />(feet) <br />Corresponding <br />Groundwater Elevation <br />(feet) <br />ST-10 <br />924.1 <br />5 <br />919 <br />ST-11 <br />923.8 <br />5 <br />918 1/2 <br />ST-12 <br />924.1 <br />5 <br />919 <br />ST-13 <br />904.1 <br />8 1/2 <br />895 1/2 <br />ST-14 <br />917.7 <br />7 1/2 <br />910 <br />ST-15 <br />925.3 <br />7 <br />918 <br />ST-16 <br />929.6 <br />Not Observed <br />---- <br />At Borings ST-3, ST-5, ST-9, and ST-13 performed in the west portion of the site adjacent to the wetland, <br />groundwater was encountered between depths of about 8 to 9 feet, which correspond to elevations of <br />about 895 to 896 feet. At Borings ST-4, ST-6 through ST-8, ST-10 through ST-12, ST-14 and ST-15 <br />performed in the central and east portions of the site, groundwater was encountered between depths of <br />about 2 to 7 feet, which correspond to elevations of about 908 to 919 feet. <br />The site is situated between Wilkinson Lake (OHW 895.2 feet) and Amelia Lake (OHW 908.1 feet). The <br />ordinary high water (OHW) levels were obtained from the MN DNR Lake Finder website. <br />Based on the results of the borings, it is our opinion that some of the groundwater encountered in the <br />borings in the higher portion of the site is perched groundwater within granular alluvial soil layers <br />overlying less permeable clayey glacial till soils. We anticipate that seams or zones of perched water will <br />be present at variable elevations across the site and should be expected during construction. <br />Because the apartment and senior buildings will likely have below grade parking as well as an in -ground <br />pool, we recommend that additional soil borings be completed in which we can install piezometers. The <br />piezometers can measure groundwater levels over an extended period of time to assist in establishing <br />low floor grades. Project planning should expect groundwater will fluctuate seasonally and annually. <br />13.4. Laboratory Test Results <br />We performed mechanical analyses through a #200 sieve (P200) and moisture content tests in <br />accordance with American Society for Testing and Materials (ASTM) procedures on samples recovered <br />BRAUN <br />INTERTEC <br />