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1795 Fox Street July 14, 2017 <br /> Project#: 11767.17.MNS Page-5 <br /> Based on the borings and assumed grades, foundations and are expected to bear on the glacial soils <br /> encountered. The data indicates the various materials are suitable for support of foundations carrying loads <br /> of up to 3,000 psf. Settlements are expected to be less than 1 inch and likely on the order of inch or less. <br /> The remainder of this report provides further details of our recommendations. <br /> E. Grading Recommendations <br /> E.1. Stripping <br /> We recommend removing all topsoil from the building and paved areas. Any debris, organic, root-laden or <br /> otherwise unsuitable materials that may be encountered during construction should also be removed from <br /> building and pavement areas. <br /> E.2. Over-Sizing <br /> The stripped surface should be oversized at least 1-foot beyond the perimeter of the buildings or paved areas <br /> for each foot of fill needed below footing grade or pavements. This over-sizing can be reduced by up to 50% <br /> if rather precise staking is present during grading. However, we suggest allowing a few extra feet as a <br /> nominal safety factor against stakes getting moved or against repositioning of buildings on site. <br /> E.3. Filling and Compaction <br /> All fill placed in building areas and paved areas should be compacted to at least 95%of the soil's maximum <br /> standard Proctor density. For ease in construction, clean sands or gravels are the preferred fill materials and <br /> should be used as backfill against below grade walls. When used sand against below grade walls,the sands <br /> should be capped with clayey topsoil or pavements,to prevent surface water infiltration into the backfill. <br /> F. Building Design <br /> F.1. Foundation Depth <br /> For frost protection, we recommend placing foundations for heated structures at least 42 inches below the <br /> exposed ground surface. Interior footings for heated structures may be placed directly below slabs. Footings <br /> in unheated areas should be placed at least 60 inches below the ground surface. <br /> F.2. Bearing Capacity and Settlement <br /> Footings are expected to bear on reasonably stiff or dense natural soils. Based on the date, we are of the <br /> opinion that a bearing pressure up to 3,000 psf may be used to design foundations. This capacity includes a <br /> safety factor of at least 3 against shear failure. Total settlement is expected to be less than 1 inch and more <br /> likely on the order of inch or less. <br /> MINNESOTA IOWA WISCONSIN <br />