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June 28,206 <br />David and Judy I:ing <br />L&A Job No. GA076 <br />1'agc 12 <br />'I'he builJing sctback fiom thc top of bank of slope 40% or more may be reduced to lU fect if pile <br />foundations nre uscd within 20 fect of the top of bank of slope 40% or more to support the <br />buildinit. Thc pilcs should bc driven ro"rcfusal" as defined in this report, and battcred piles <br />and/or ticb_.k anchors should be pro��ided for resistnnce against lateral force to the building in <br />the dircction towards the stcep slope. A combination of conventional 1'ooting 1'oundations smd <br />pile foundations, mccling thc abovc building sctback rccommcndations may be used to support <br />thc building. <br />CONVENTIONAL FOOTINC FOUNDATIONS <br />Convcntionnl footing foundations mny bc uscd for supporting lhc proposcd buildings. Thc <br />footing foundations should hc placcd on or into thc undcrlying, nativc, undisturbcJ, densc <br />F.slxrancc Sand ancUor harc: Whidbcy formation soils. Watcr should not be nUowed to <br />accumulatc in cxca��atcd footing trenches. Disturbcd soils in footing trenches or undcr on-grade <br />slabs/pavemcnt should bc complctcly rcmovcd down to firtn nativc soils or thoroughly rc- <br />compactcd to a non-yiclding statc prior to pouring concrctc for thc footings. <br />If thc abavc rccammcnd,itions arc followcd, our rccommcndcd dcsign critcria for fooling <br />li�undalions are as fi�llows: <br />•�rn� �u���ani� soil bc:uing pressurc for footing foundations, incluJing dead und livc <br />loads, should not cxcecd 3,000 psf if placcd cn native, undisturbeJ, dcnse L'sperancc <br />S.md or hard Whidbcy fortnation soils, and not �o exceed 2,500 psf if placed on sWctural <br />lill constructcd ovcr such com�xtent b<<sal soils. Thc footing bcnring soils should bc <br />verilicd on-site by n gcotechnical cngincer aficr lhc footing trenches are excuvated nnd <br />bcforc thc footings pourcd. <br />• 7'he minimum depth to bottom of perimctcr footings bclow adjaccnt final extcrior Erade <br />shoulJ be no Iess than 1 R inches. 'fhe minimum depth to bottont of the iucerior footings <br />bclow top of (loor slab should bc no less than 12 inches. <br />LIU & ASSOCIA'1 �.�, .",�. <br />