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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 />General Site Conditions: <br />The site is located on the west side of Jackson Avenue Northwest and between 6th Street NW and <br />8m Street NW in Elk River, Minnesota. Park land is present just to the west of the site. Phase 1 <br />was constructed in 2018 on the south side of 6 h Street NW. The site is currently an open level lot <br />that is lower than the surrounding area. The site is relatively flat with slopes of 0-2%. A ditch runs <br />from the southeast property corner to the north and west through the property. <br />Available Subsurface Information: <br />According to the Geologic Map of Minnesota, Quaternary Geology, prepared by Howard C. Hobbs <br />and Joseph E. Goebel (1982, Minnesota Geological Survey), this site lies within an outwash unit <br />not associated with any particular moraine. It is associated with the Des Moines Lobe glaciation of <br />Pleistocene, Late Wisconsinan age. The glacial drift from the Des Moines Lobe consists of grey, <br />calcareous material with shale and limestone clasts derived from parent material in Manitoba and <br />eastern North Dakota. <br />According to the Soil Survey of Sherburne County prepared by the Soil Conservation Service, this <br />site lies within the Hubbard- Estherville- Salida Soil Association. These consist of nearly level to <br />gently rolling sandy soils over deeply leached sand or calcareous gravel. The individual soils <br />mapped on the site consist of shallow peat and muck over sands. These soils are rated as <br />unsuitable for building support and have a very shallow water table <br />B. Exploration Program <br />Twenty (20) split -spoon soil borings were conducted on this project. The borings were advanced to <br />depths of 10 to 20 feet deep using a 3'/ inch I.D. hollow stem auger. Samples were obtained every 2'/2 <br />feet for the first 10 feet and every 5 feet thereafter using a 2-inch O.D. split spoon sampler in <br />accordance with the American Society for Testing and Materials (ASTM D1586). Standard <br />penetration values (N-values) were obtained at each sample interval by driving the sampler into the <br />soil using a 140-pound hammer falling 30 inches. After an initial set of 6 inches, the number of blows <br />required to drive the sampler 12 inches is known as the standard penetration resistance or N-value. <br />Where the sampler can not be driven at least 6 inches by 50 blows of the hammer, the total number of <br />blows as well as the distance driven is reported on the boring logs. <br />Groundwater levels were noted during drilling and immediately after completion. The deep holes <br />were sealed with bentonite grout in accordance with MDH requirements. The shallow holes were <br />backfilled with the auger cuttings. Some settlement of the bore holes may be expected. The borings <br />were conducted with a truck mounted drill rig. The boring locations were staked by us. Surface <br />elevations are based on the assumed elevation 100.0 for the top of the fire hydrant at 6th Street NW. <br />Page 2 <br />