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� . <br /> JID L.NELSON AND ASSOCIATES, INC. � <br /> � Consultmg Enginterins Geology <br /> � April 7, 1989 <br /> Pro,�ect No. 3989 <br /> � Page 6 <br /> � found during our exploration. An allowaCle soil bearing pressure of 2500 <br /> pounds per square foot f�sf) could be used for deslgn of shallow footings <br /> placed a minimcm of 18 inches below flnish grade within the structural f111 . <br /> � The sugqested so11 Eearing capacities use a factor of sefety of 2.5 and is <br /> based on the folluwing conditions: ' <br /> � 1. All footings should be founded intu the structural fill <br /> soils as described above, a minimum of 18 inches below <br /> finish adJacent grade, and at least : fe�t above the highest <br /> � perched water levels found during our exploration. <br /> 2. All footing excavatlons shouid De �r�oared such that a <br /> � dense, nonyielding, uniform soil condi 'i;�n has been <br /> established prior to placement of footir�g concrete. <br /> 3. All footings should be sized according to the anticlpated <br /> � wa11 or column ioadings, and the above so11 bearing ralues. <br /> Minimum footing widths of 18 and 24 inches are recommended <br /> for all contlnuo�s and Tsolated footinys, respectively'. <br /> i � 5. All footings should be free of ponded water and sloughed <br /> or water ioosened soils prior to plecement of footing <br /> � concrete. <br /> Ground settlements due to structural loeds are exoected to be less then one <br /> (1) inch total and one-half (1/2) inch differentiel over the building erea. <br /> � <br /> Slab-On-Grade Preparation <br /> � Intertor slabs-on-grade should be placed upon the structural fill , upon which <br /> a vapor barrier ccnslsting of visqueen end a 4 inch sand or pea grevel layer <br /> � hes been piaced. <br />� Retalning Mells <br /> The deslgn lateral earth pressures atting on retaining Hails are a functton of <br /> the type of Nall (for example, yfelding or non-yielding), the method of <br />� construction, and the type of soil used behind the wall . For fixed or non- <br /> y.telding Ma11s, we recomnend that the "at rest" condition should be assumed, <br />� and that en equivalent fluid pressure of 55 ibs. per cubic foot be used for <br /> design purposes. For ylelding walis, such as cantllever walls, the "active" <br />� condition may be assumed end an equlvalent fluid pressure of 35 lbs. per cubic <br />�� <br />