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<z> <br />SOIL CONDITIONS <br />Four basic soil types were encountered in our investiga­ <br />tion. These are: fill; post-glacial organic soils; water-modifie| <br />clayey and sandy glacial till; and glacial outwash sand and grave <br />Fill <br />In the proposed house pad area there is a 5% to 6* thick <br />covering of fill. The fill consists mainly of clayey and silty <br />fine to medium sand. This soil is mainly in a saturated and <br />loose condition, since we believe that much of it was dumped unde­ <br />water. <br />In its present loose condition the fill is unsuitable for <br />foundation or floor slab support. <br />Post-Glacial Organic Soils <br />Directly below the fill is a 15*s to 17^ foot thick layer <br />of organic soil. The uppermost few feet of this deposit is peat, <br />and the lower major portion is highly organic silt containing <br />mollusk shell fragments. The peat and organic silt are weak and <br />highly compressible. They are totally unsuitable for foundation <br />support. <br />Des Moines Sandy and Clavev Glacial Till <br />Directly below the organic soils, at21^ to 23 foot depth <br />below present fill surface, is a stratum of natural inorganic <br />soil. It consists mainly of grey, layered or interbedded clayey <br />and silty fine sand, fine sandy silt, sandy' clay, with random <br />lenses of fine to coarse sand throughout. The clayey and silty <br />component of this soil has slight plasticity and is stiff in <br />consistency. The sandy component is saturated, non-plastic, and <br />loose to medium dense. <br />This soil stratum would be suitable to support light build­ <br />ing loads. <br />Glacial Outwash Sand <br />Commencing below the 33' depth in Test Hole 1 is a stratum <br />of clean,well graded sand and gravel. This soil layer is medium <br />dense, and is a competent load-bearing stratum. <br />(& <br />SUBTERRANEAN <br />ENGINEERING CORP. <br />MINNEAPOLIS. MINNESOTA