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-5- <br /> <br /> <br />(6) A 4-inch void sriould be provided beneath the ^rade .",earns to <br />prevent tYie soils from exerting uplift forces on the grad2 »ea^s <br />and to concentrate tiie pier loadinos. <br />(7) i,ll.pier holes should be thoroughly cleaned and dewater?d prior <br />to placement of concrete. Free water was not enccunteren ~.aithin <br />the.aaintenanc=_ building area at tine of our invasti^.ation; <br />however, water was encoun*.ered within *,he !~edrocp at Hole 4, and <br />sore casing and/or pu~pinn nay be required. In no case snoulr <br />concrete be poured in more t'~an 6 inches of cater. ~oncreie <br />should be available for imediate placenent .after L'tc pier shaft <br />is drilled. <br />So read Footings:. Preferanly, individual footinn ele^~ents sho~ild ha <br />place) on a cnr~~on 'Dearing stratum of either the upper nat~_ral clay <br />.soils or co^~oaeted fill.. Footings transitidninn, cut ann fill sec*.ions <br />' should only: be utilizeil where differential settlement o~i *_~ie orcer of <br />1-1/2 inches is tol?rable. The follo:ainr: desinn and construction <br />details should be observed: <br />(1) Spread footings alaced on the upper natural soils and/or <br />canpacted fill can be designed fora r,axi~num soil pressure of <br />3,U~0 psf. <br />(2) Foo ti nns should nl so he desicned fora ainimun dead 1oa c+ !+rec5i~re <br />of 1,OuU psf. This ray require use of void spaces to concentrate <br />loa!ts. <br />i <br />(3) 4ny Continuous foundation :+alls should be r?inforee~+'to corn an <br />unsupported lennt`~ of at least 1~) feet. <br /> <br />