3003 W CASINO RD BLDG 40-56 Geotech Report 2018-01-02 MF Import

We anticipate that the surcharging process will eliminate approximately 90 percent of the primary and secondary post -construction settlement of the slab in the organic -rich zone. However, some long term decomposition and resulting compression of the more highly organic pockets (i.e. over 40 percent organic materials) will likely induce irregular troughs of settlement during the lifetime of the building. We estimate that perhaps 0.75 to 1.0 inch of settlement could eventually occur where the soil profile is similar to that encountered in Borings B-3-91 end B-12-I81. Differential settlement of about 0.75 inches could occur between adjacent organic -rich and non -organic zones, i.e. over distances of perhaps 50 feet. A thickened slab should be used in the zone to bridge over any localized settlement. If site preparation recommendations (see Section 5.8) including thorough proofrolling and careful placement of compacted fill are followed, total settlement of portions of the floor slab outside the surcharged area will be in the mass from approximately 1/2 to 3/4 inches. Differential settlements of 1/2 to 3/4 inches may occur between locations having wry little fill and those where the thickness of fill is substantial. Such differential settlements might therefore occur over distances of 100 feet or more. These settlement estimates were obtained assuming that the full 500 par design load was applied over a minimum area of 400 feet by 400 feet. The actual settlement will be somewhat less if loaded areas are smaller and less continuous. The modulus of subgrade reaction, k, for design may be taken as 230 pounds per cubic inch (pci) for slabs supported on compacted selected fill. 5.4.2 SamsM A temporary surcharge placed on the prggMad gubgrade is recommended to reduce the settlement potential of the organic rich soils. (Recommendations for site preparation are presented in a latter section.) The surcharge should apply a surfs a pressure of at least 1,100 par, which is equivalent to about 10 feet of loosely placed soil fill. The surcharge fill Is in addition to any fill required to achieve final site grades. The crest of surcharge should be at least 20 feet a-005-00695-016%*&o90r00.a p 00695-WO-016 16