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� � 1 <br /> Gen�eclrnical Engineering R pnrt a June?, ?009 <br /> Commu�riq�Henl�h Cen�cr. F.��erc�l, 11:1 Projrcf k?009-1.ia <br /> � <br /> T:�blc 1. Structur:�l Fill <br /> � U.S.Sicvc Sizc I'crcent Passing <br /> I3 inchcs 100 perccnt <br /> No.d sievc 0 to 75 perccnt <br /> ! No. 200 sicve 0 to 5 percent ' <br /> I *[3ascd on minus 3/�J inch Gaction. <br /> d.3 Fnundatinns <br /> I �ollowing the sitc prcparation and grading, thc proposcd building linmdation can bc <br /> supportcd on com�cntional sprcad footings bcaring on medium to dense native soil or <br /> structural lill. Perimcter loimdations exposed to the ��•cather should be at a minimum depth <br /> Iol' 18 inchcs below linal exlerior grades. (nterior foundations can bc constnuted at any <br /> com�enicnt depth below tho floor slab. <br /> � We recommend Jesigning foundations for u nct allowable bearing capacity of 2,500 <br /> pounds per squarc loot (pst). �or short-tcrm loads. such as �vind and scismic, a I/3 <br /> inerease in this allo�vable capacity can be uscd. <br /> II�ur dcsigning f'oundations to resist latcral loads, a basc Giction cocfticicnt of 0.25 can bc <br /> used. Passive earth pmssures acting on the side of the footing and buried portion of tlic <br /> timndation stem wall can also bc considercd for resisting latcral loads. Wc recommend <br /> calcidating this latcral resistance using an equivalent tluid �eeight ol'2�0 pounds per cubic <br /> loot (pcl). At perimeter locations, wc recommend not including Ihc upper 12 inchcs of soil <br /> in lhis computation becausc they� can be afl'ectcd b}� �veather or disturbed hy futttre grading <br /> activity. This valuc asswnes tl�e Ibundation will be constructcd ncat against competent lill <br /> soil or backlillcd wiUi stnicttval till as dcscribed in thc Sitc Prcparation and Grading <br /> ; scction. The recommended 1'riction and passive resistance valucs include a safety factor of <br /> I.�. <br /> With sprcad I'ooting ('oundations as mcommcndcd, you should expcct maximum total and <br /> dilierential post-construction settlements of I-inch and 'h-inch, respectivcl��. <br /> Id.�t Slab-on-Gradc ConsMaction <br /> With site preparation complctcd as dcscribcd in the Sitc Prcparation and Grading section, <br /> Isuitablc support t'or slab-on-grade construction should be provided. RGl recommends that <br /> slab-on-grade constractic: be supported on timi nati��e soil or slructural lill. fmmediatcl�� <br /> bclow tlre tloor slab. �vc recommcnd placing a four-inch thick capillary break laycr ol' <br /> clr.m, tirc-draining pca gravcl. washcd rock. or crushed rock that h�s Icss than ti��c pc�cent <br /> ' The Riley Group, Inc. <br /> -6� <br />