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Gen�cchnica! F.nginecrinA Rcpnri S Octaber 17, 2005 <br />Cnm�rnmi(�� Hcal�b Cenlcr, P:vcreff, 11'A Prnjed k2003-l9h <br />in this computation becausc thcy can be affccted by wcathcr or diswrbed b}• future grading <br />acti��ity. This valuc assumes thc foundation �vill be constructcd neat against competent fill <br />soil or backtilled �sith structural fill as dcscribcd in thc Site Preparation and Grading <br />scction. T'he rccommended friction and Passive resistance values include a safety factor of <br />1.5. <br />With sprcad footing foundations as recommended, you should expect maximum tolal nnd <br />difl'crential post-construction sculements of i-inch and'/-inch, respecti��cly. <br />�l.a SI»b-on-Grodc Construction <br />\Uith site preparation completcd as describcd in thc Sitc Preparation and Cirading scction, <br />suitablc supporl for slab-omgradc rnnstruction should be pro��idcd. Rilcy rccommcnds that <br />slat�-on-graJc construction bc supportcd on finn nati�c soil. Immcdiatcl�� bclow thc floor <br />slnb, wc recommend placing a fourvinch thick capillnry brcak laycr of cican, frec-drnining <br />sand or gravcl that has Icss than fivc perccnt passin� thc No. 200 sicvc. This material �cill <br />rcduce thc potential for up�ti�ard capillary m��vemcnt of a�ater through the underlying soil <br />and subscyucnt wcuing of thc �oor slah. <br />�1'hcrc moisturc by ��apor transmissiun is undcsirablc, an S to 10-mil thick plastic <br />mcmbranc shoulJ bc placed on a 4-inch thick la�•cr of capillary brcak. T7ic mcmbranc <br />should bc covcrcd ���ith 1 �o '? inches of cican, moist sand to gu:ud against damagc during <br />construction and to aid in curing of thc concrctc. <br />I�or thc anticipatcd floor slah loading. �vc cstimatc post-construction tluor setticmcnts of <br />'/�- to'/•.-inch. <br />a.S Rctainine �1'alls <br />At thc timc �il� prcparati�m of this rcport, I2ilc} is not a�carc ol' an} nc�+ retnining ��alls <br />proposcd ti�r the silc. lf rctaining ��alls ���ill be nredcd, they should be designcd based on <br />Ihc suil par:nnctcrs pro�•idcd hclo�c. <br />I+ilcy rccommcnds dcsigning unrcstraincd ��alls for an activc carth pressure cquivalent to a <br />11uiJ �vcighing iS pcC For restrained ���alls, an carth pressur: impos:d bJ• an equi��alent <br />fluid weighing 55 pct'should be used for design. I�or seismic design, an addition uniforni <br />luad of 5 l0 7 I I(11 is �+all hcight) should bc applicd to thc ���nll surfacc. 7licse �•alucs <br />:issumc a horir.ontal hackfill condition ���ithout building or tratTic surcharge loading on the <br />��all. <br />lhe ��alls nnist ,�Iso hc provided ��ith adcyuatc drainaE�c and shrnild be ���atcrpmofed. A <br />i�ricul rctnining ��:ill draina�r Jct:iil is sho��•n on Pigurc �. <br />l'hc Rilc�� Group. Inc. <br />