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12 <br />Even though there would be a tendency for different parts of <br />the structure to settle differentially, with estimated <br />settlements of 1/2" min. to about 1-3/4" max., the structural <br />rigidity of the raft would mitigate the uneven settlement <br />pattern, and should result in tolerable performance of the <br />superstructure. Furthermore areas of most settlement could <br />potentially be raised by pressure injection of an appropriate <br />grouting compound below the raft slab, a process commonly <br />referred to as "mud -jacking. <br />To prepare the site for a raft -type foundation, all <br />obviously organic surface topsoil should be removed from the <br />proposed building pad area, and a minimum 4' subcut should be <br />made below design subfloor elevation. All fill should be a clean <br />well graded sand and gravel containing less than 7% fines. It <br />should be spread in loose lifts limited to 8" in thickness and <br />compacted with a large smooth drum vibratory roller to achieve at <br />least 95% Maximum Modified Proctor Dry Density, ASTM D-1557. <br />fwfLRRA�AN <br />i11. GsiNlriR��i <br />_I 61i7�e5 .VE <br />TiT PO so. 1:70! <br />1 M ^nrepo^. MN SS= <br />