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1795 Fox Street July 14,2017 <br /> Project#: 11767.17.MNS Page-3 <br /> B. Subsurface Data <br /> Methods: All of the borings were performed using penetration test procedures (Method of Test D1586 of the <br /> American Society for Testing and Materials). This procedure allows for the extraction of intact soil specimen <br /> from deep in the ground. With this method, a hollow-stem auger is drilled to the desired sampling depth. A 2- <br /> inch OD sampling tube is then screwed onto the end of a sampling rod, inserted through the hole in the auger's <br /> tip,and then driven into the soil with a 140-pound hammer dropped repeatedly from a height of 30 inches above <br /> the sampling rod. The sampler is driven 18-inches into the soil,unless the material is too hard. The samples are <br /> generally taken at 2%to 5-foot intervals. The core of soil obtained is classified and logged by the driller and a <br /> representative portion is then sealed in a jar and delivered to the soils engineer for review. <br /> B.1. Stratification <br /> At the surface,the borings encountered less than 1 1 /2 foot of topsoil. The topsoil mainly consisted of dark. <br /> Slightly organic clayey sand. <br /> Beneath the topsoil,the borings met layers of primarily glacial sandy lean clays and clayey sands. A layer of <br /> rather clean poorly graded sand was met within the clayey soils at the east boring location. <br /> The boring data has been summarized in the following cross-section. For more detailed information, the <br /> reader is referred to the individual Log of Boring sheets in the Appendix. <br /> 100 <br /> IIIIII ■ Topsoil <br /> 95 <br /> k; Clayey Sand <br /> c <br /> 90 <br /> Sand <br /> a) 85y ,et ''>' <br /> .Xci; Sandy Clay <br /> s <br /> a <br /> Or <br /> < 80 <br /> 4 <br /> P. d Below Boring <br /> 75 <br /> B-1 B-2 B-3 <br /> Boring Number <br /> B.2. Penetration Test Results <br /> The number of blows needed for the hammer to advance the penetration test sampler is an indicator of soil <br /> MINNESOTA IOWA WISCONSIN <br />