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November 9, 2006 <br />Single-Fumily Residence - Delvedcre Lot 4 <br />I.&,A Job No. 6A 149 <br />Page 9 <br />Structural fill should be placed in lifts no more than f 0 inches thick in loose sWte, with each IiR <br />compncted t•� a minimum percentage of th� ���aximum dry density determined by ASTM D1557 <br />(Modificd Proctor Mcthod) es follows: <br />Anolication <br />Within building pad und undcr foundat�ons <br />Roadway/driveway subgredc <br />Retuining wall buckfill <br />Utility trcnch backfill <br />I3UILDING FOUNUATIONS <br />% of Maximum Drv Densitv <br />95% <br />95°/a for top 3 feet and 9G% below <br />90% <br />95% for top 4 feet and 90°'o below <br />Conventional footing founJations may be used to support the proposed residence. The footing <br />foundntions should be placed on or into the underlying, undiswrbed, dense to very-dense <br />Espernnce S�nd soils. Water should not be ullowed to accumulate in excavated footing trenches. <br />Disturbed soils in footing trenches or under on-grade slabs/pavement should be completcly <br />rcmovcd down to firm nativc soil�, ��r ihnn,u��hk rc-r�,nq�acicd tn :i m�n-��iclding ,lalc priur iu <br />pouring concrete for thc footings. <br />If thc abovc rccommcndatiuns ;�rr tullu��r�L �,ur rec��mmcndrJ �Icsi�n crilcria lur fi�oting <br />foundations are as Ii�ll�i��s: <br />• Thc allu��ahlr ,nil hrarinp pr�ssurr liir liwting �ixmdatiuns, indudin� dcad and li�c <br />loads, should bc no grcaicr than 3,000 psC 7'hc footing tx�ving soils should bc vcrificd <br />on-sitc hy �� gcotechnical enginecr ufter thc footing trenches are excavatcd and before thc <br />tiiolin�s rourcd. <br />LIU & ASSOCIATES, INC. <br />