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<lr�n��chr�ica! lin�;inrcring Rcpnrt a Oclobcr I?, 1005 <br />('annriur�il�'NeallhCenlcr.6\vvc�l. Hil Prq'ec!#1005•l96 <br />I�hc nati�c soil consists of largc proportion �r rn� and is charactcristically moiswrc <br />sensitive. Rilcy recommends that all sitc grading and enrthwark acti��itics bc perfornied in <br />drv Ncathcr mnditions. Thc o�+�ncdcontractor should bc prcpared to dcal n•ith soft ground <br />problcros it' thc carthHork occurs during periods of prccipitation, particularly if <br />cunstruction occurs during thc wct ��•intcr scason. <br />Thc nativc soil without organic comcnt should bc suitablc to be uscd as structural till if thc <br />moisturc can bc properly controllcd. Sincc thc nati��c soil is moiswre scnsiti�c. ���c <br />rccommcnd importing a m�tcrial that meets thc grading rcquirements listcd in 7ahlc 1 if <br />lhC construcli�m occurs in ���cl sc;�son. <br />Tnblc 1. Structurul Fill <br />U.S, tiic� c Sizc Pcrccut Pussing <br />3 inches 100 perc�:nt <br />No. 4 sicvc 0 to 7$ perccnt <br />No. 200 sicvc 0 to 5 percent • <br />•I�ascd on minus 3/d inch fraction. <br />Prinr to usc, Rilc�� should cxamine and tcst all matcrials importcd lo lhc silc for usc as <br />structural till. Structural �ill matcrial, should hc placcd in unifomi loosc la}�crs not <br />cxcrcding 12 inchcs and contpactcd to u minitnum of 9i perccnl uf thc soil's maximum <br />dcnsit��, as dctcnnincd I,y AS1T4 l�cst Design:�tion D-15S7 (Modificd Proctar) until thc <br />desircd linished �radc is met. I he moisturc content of the soil at tlic timc of compaction <br />should hc �� ithin ,�hout t�cn prrccnt of its ��ptimum, as dctcmiincd hy this ASTM mcthod. <br />4.3 Pnundntinns <br />Pullo�cin� thc sitc �,rcpar.itinn and �rading. thc pruposed builJing foundation can bc <br />sup����rtcd nn cimccntiunal sprcad li�otings hcaring on mcdium dcnsc tu densc nati��c soil or <br />strucuiral lill if necd�d. Perimeicr finmJations esposed to the ���eatlier should be at a <br />minimum dc��th uf 18 inchcs hclo�c linal cstcrior grades. Intcrior foundations can hc <br />construcicd at ,�m com•cnicnt dcpth hclo�c thc �loor slab. <br />\\'c rccommcnd dcsignin� li�undations for a nct allo��ablc bcaring capacity 01� 2,500 <br />��uunds per syuarc f��ot I�sil nn neti��c soil or structural f II. Por short-tcrni ioads, such as <br />��ind and scismic, a li? Iill'fl'75l' Ifl llll5 allu�cahlc capacit� rm bc used. <br />Fnr designing foundations to rcsist lateral loads, a hase Giction coet7icient of 0.35 can be <br />uscd. Passi�r carth rrcssures acting on thc sidc of dic footing and buricd portion of thc <br />I�xuxlati��n sicm �eall cvi also F�c considcrcd ti�r resistin� latcral laads. \4'c recommcnd <br />adcid;uing ihi� I;itcral resistancc usiug an cyui�•alcnt iluid ��cight of 250 pounds per cubic <br />f��ut 1 ��rtl. \t �,crimctcr loc.�tinn,. �cc rccommcnd not including thc upper 12 inchcs of soil <br />�I�hc Rilc�� Grou��, lnc. <br />