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Ramsey Business Park 95 Infrastructure Replacement December 9, 2020 <br />Project #: 17624.20.MNS Page - 3 <br />B. Subsurface Data <br />The borings were performed using penetration test procedures (Method of Test D1586 of the American <br />Society for Testing and Materials). This procedure allows for the extraction of intact soil specimen from deep <br />in the ground. With this method, a hollow -stem auger is drilled to the desired sampling depth. A 2-inch OD <br />sampling tube is then screwed onto the end of a sampling rod, inserted through the hole in the auger's tip, <br />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 <br />are generally taken at 21/4 to 5-foot intervals. The core of soil obtained was classified and logged by our <br />drilling personnel at the site and a representative portion was then sealed and delivered to our laboratory for <br />further review. <br />B.1. Strata <br />At the surface, the pavement borings encountered about 3 to 6 1/2 inches of asphalt over 3 to 12 inches of <br />aggregate base. Boring B-04 encountered about 1 foot of silty sand fill at the surface. About %2 foot of <br />topsoil was encountered in Boring B-05 at the surface. <br />Below the surface materials, most of the borings encountered fill to possible fill to depths of 4 feet or <br />more. The fill consisted primarily of rather clean sands but Boring B-06 contained some silty sand. <br />Below the surface materials and fill, most of the borings were dominated by clean sands natural sands <br />(poorly graded sand and poorly graded sand with silt). <br />For the reader's convenience, we have summarized the soil boring data in the following cross-section. <br />The reader is referred to the boring logs in the Appendix for more detailed information. <br />Approximate Depth (Feet) <br />884 <br />882 <br />880 <br />878 <br />876 <br />874 <br />872 <br />870 <br />868 <br />866 <br />864 <br />862 <br />860 <br />858 <br />856 <br />854 <br />852 <br />850 <br />848 <br />West <br />East <br />1 <br />2 7 8 3 <br />Boring Number <br />6 <br />4 <br />5 <br />® Pave Mat'I <br />• Topsoil <br />i Fill -Sand <br />Fill -Silty Sand <br />i Sand <br />MINNESOTA IOWA <br />WISCONSIN <br />