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Mr. Gary Gleason, P.E. 8 January 17, 2001 <br /> GME Project No. 9256 <br /> gradation testing and review by a Geotechnical Engineer to determine the <br /> suitability. We do recommend that fill material such as silty fine sand, <br /> uniformly graded fine sand, or clayey sand not be used as the fill . <br /> The granular fill should be placed in loose lifts about S to 10 inches <br /> thick. Each lift should be uniformly compacted to at least 95� of the <br /> maximum Modified Proctor dry density (ASTM: D 1557) . <br /> Under areas where the exterior patios, sidewalks, and entry slabs will be <br /> constructed, on the south and east sides of the building, we recommend <br /> that a special material be used as the subgrade soil, consisting of NFS <br /> sand. This should be a material such as Mn/DOT 3149 .2J, limited to no <br /> more than 4� passing the No. 200 sieve. The purpose of using NFS sand <br /> subgrade is to reduce the potential for the expansion that silty or <br /> clayey soils undergo when they freeze in the winter. This expansion can <br /> cause heaving of overlying slabs or pavements. Typically, this heaving <br /> is non-un�form, and can result in cracking and unevenness of the slabs . <br /> The NFS sand subgrade should be at least 3 feet thick under the exterior <br /> patios. It should be placed in loose lifts about 8 to 10 inches thick, <br /> and compacted to at least 95� of the maximum Modified Proctor dry <br /> density. <br /> OME CONSULTANT:,INC. <br />