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1795 Fox Street July 14,2017 <br /> Project#: 11767.17.MNS Page-4 <br /> characteristics. The number of blows to advance the sampler 1 foot is called the penetration resistance or"N"- <br /> value. The results tend to be more meaningful for natural mineral soils,than for fill soils. In fill soils,compaction <br /> tests are more meaningful. <br /> Penetration resistance values (N-values) of 4 to 15 Blows per Foot (BPF) were recorded in the sands, <br /> indicating they were very loose to medium dense. Values in the clays ranged from 10 to 16 BPF, indicating <br /> they were rather stiff to stiff. <br /> A key to the descriptors used to qualify the relative density of soil(such as soft, std loose,and dense) <br /> can be found on the Legend to Soil Description in the Appendix. <br /> Pocket penetrometer tests were performed to help estimate the compressive strength of the cohesive soils. <br /> The sandy lean clays returned values of 1 to almost 3`tons per square foot(tsf)-. <br /> B.3. Groundwater Data <br /> During the drilling operation,the drillers may note the presence of moisture on the sampling instrument,in the <br /> cuttings,or within the boreholes. These observations are recorded on the boring logs. The water level may vary <br /> with weather;time of year and other factors and the presence or absence of water during the drilling is subject to <br /> interpretation and is not always conclusive. <br /> Water was not observed in any of the borings and all the boring were dry to cave-in depths of 12 'A to 14 feet <br /> after drilling. Groundwater levels would be expected to fluctuate seasonally, similar to water levels in <br /> nearby streams and rivers,along with local weather patterns. <br /> C. Design Information <br /> Each structure has a different loading configuration and intensity,different grades,and different structural and <br /> performance tolerances. Therefore,the geotechnical exploration will be construed differently from one structure <br /> to another. If the initial structure should change design,we should be engaged to review these conditions with <br /> respect to the prevailing soil conditions. Without the opportunity to review any such changes, the <br /> recommendations may no longer be valid or appropriate. <br /> The project is understood to consist of construction of a new residence. The main level is assumed to be at <br /> or close to the assuming ground elevations for the homes will be close to elevation 100 on the datum used, <br /> with an underlying full or partial basement. Foundation loads were assumed to be on the order of 30 kips or <br /> less per column and 3 kips/foot or less along strip footing lines. <br /> D. Summary Analysis <br /> The topsoil should be stripped from the housing areas. Properly compacted engineered fill should be used <br /> where structural fill is needed below footings or slabs. <br /> MINNESOTA IOWA WISCONSIN <br />