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w,,' <br /> ���� '��� � Hart Crowser <br /> ��'. <br /> J-3446-01 <br /> �����` <br /> �}U`' recommend an ultimate passive equiva]ent fluid weight of 350 <br /> �+>.,.. <br /> i���,; pounds per cubic foot (pc�; <br /> :���. <br /> 9-, <br /> t�,- ► An ultimate coefn"cient of friction to resist sliding equal to 0.45 can <br /> �'� be used for footings poured neatly on gtanular material; <br /> �'i' <br /> �:.,. <br /> G.; ► A factor of safety of at least 1S should be used in computing the <br /> ^'•` resistance of footings and walls to transladon (sliding); and <br /> �;: <br /> r�' <br /> ► Have a qualified geotechnical engineer or geologst observe exposed <br /> subgrades prior to footing consffuction to verify suitable bearing <br /> surfaces. , <br /> We estimated faoang settlements using the loading conditions presented <br /> previously and following the recommendations presented above, r�inery <br /> kip column ]oads distnbuted at 2,000 psf should induce less than 1 to <br /> 1'h inches of total settlement Differential settlements w71 be rough]y <br /> half the rotal settlement The majority of this settlement w�11 be short <br /> term, occurring as the footing is loaded. <br /> SIaL-on-Grade Design <br /> The intcrior floors of the bwlding can be constructed as siabs-on-grade <br /> supported by the existing medium dense fill or imported structural fill. <br /> �Ve recommend the following: <br /> ► Proof roll the subgrade prior to capillary break placemen� Any soft <br /> azeas need to be overercavated and replaced with structural fill. <br /> Verdcal limiu of overexcavation and structural fill p]acement need <br /> not ezceed 24 inches. <br /> ► Prrn�de a muumum of 4 inches of compacted clean (less than <br /> � 3 percent fines based an portion ]ess than '/. inch) well-graded sand <br /> or sand and grave] be]ow the s]ab as a cushioning layer and as a <br /> capIDary break. <br /> ► Compact the capillary layer to the criteria as discussed under the <br /> Strucfural Fill section <br /> ► Design slabs for a modulus of subgrade reaction (1-foot-square <br /> plate) of 200 pci. <br /> � -. <br /> PagC 7 ' <br />