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March 2, 2020 <br />Project 19-460 <br />Jackson Hills Residential Suite <br />Phases II- IV <br />Elk River, Minnesota <br />Boring <br />Water <br />Boring <br />Water <br />Boring <br />Water <br />SB-1 <br />7.0 feet <br />SB-8 <br />6.0 feet <br />SB-15 <br />3' 4" <br />SB-2 <br />6.5 feet <br />SB-9 <br />9.0 feet <br />SB-16 <br />2' 10" <br />SB-3 <br />3.0 feet <br />SB-10 <br />7.0 feet <br />SB-17 <br />2.5 feet <br />SB-4 <br />6.5 feet <br />SB-11 <br />9.0 feet <br />SB-18 <br />3' 10" <br />SB-5 <br />4.5 feet <br />SB-12 <br />3' S" <br />SB-19 <br />7.0 feet <br />SB-6 <br />5.5 feet <br />SB-13 <br />7.0 feet <br />SB-20 <br />5.0 feet <br />SB-7 <br />8.0 feet <br />SB-14 <br />3.5 feet <br />It is our opinion that the water levels are an accurate representation of the water levels on this site <br />because of the high permeability of the native sand soils. However, the peat (PT) soils do not <br />transmit water quickly. Therefore, where the water levels are within the organic soils, they may not <br />be an accurate measurement of the water at that time. <br />It should be noted that fluctuations in the level of the groundwater can occur due to variations in <br />rainfall, temperature, spring thaw and other factors not evident at the time of our investigation. <br />Mottled soils were observed. Mottled native soils are a historical indication of a temporarily or <br />seasonally saturated soil condition. Grey soils were observed directly below the organic soils in <br />many of the borings. Grey native soils are an indication of a permanently saturated soil condition. <br />C. Engineering Review <br />Discussion: <br />Based on our findings, the site appears to be poorly suited for the proposed building and site <br />improvements. The existing peat (PT) and soft, organic silt (OL) are not suitable for support of the <br />proposed building. We recommend all of the existing peat (PT) and soft, organic silt (OL) material <br />be completely removed from all of the building and parking lot areas. We estimate this will require <br />an excavation of approximately 2.0 to 14.0 feet over the entire site. All organic material should be <br />completely removed from site, including oversizing areas. The existing peat is not suitable for re- <br />use as structural fill beneath any structure, slab or pavement. <br />Page 4 <br />