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i <br /> � A1'r reeummcnd [hat thc �outing exca�';uiuns bc cut u,inu a smouth-cdgcd buckct to rcducc thc amount ol <br /> dis[urbcd soil cxposcd at thc subgradc. <br /> � Immediately prior to placing concrete, all debris and soil slouch that accumulated ',n thz footings dunne <br /> � forming and steel placemcnt must be removed. Debris or lausc soils not rcmo��cd from the tbotin� <br /> caca��ations will resul' En increased settlement. <br /> 1 Lateral Resistance <br /> Latcral Coundation loads may be resisted by passive resistance on the sides of footings and by friction on <br /> the base of the footings. Por footings supported on strucwral fill placed and compacted in accordancc <br /> with our recommendations, the allowable frictional resistance may be computed using a coefficient of <br /> Giction of 0.35 applied to vertical dead-load forccs. The allowable passive resistance may be computed <br /> using an eyui��alent (luid density of 300 pcf(viangular distribution). The structural fill should extend out <br /> from the facc of the foundation elemcnt for a distance at least equal to threc times the depth of the <br /> elemen,. The above coefticicnt oi friction and passivic equivalent fluid dcnsiq� �'alues incorporate a factor <br /> of saCety of about 1.5. <br /> Footing Drains <br /> I As currently envisioned, structures with intcrior space requiring protection from moisture with footing <br /> drains arc not planned Ibr the site. I: these rypes of structures are constructed, ���e recommend that <br /> perimeter footing drains be installed. GeoGnginecrs cun procidc tooune drain recommcndations if <br /> i <br /> necded. <br /> DEEP FOUNDATIONS -AUGERCAST PILES <br /> I Generel <br /> We have estimated the vertical load capacity of IS-indi diameter augercast piles. In addition, �ve havc <br /> developed geoteclmical parameters for lateral pile capacity analyses. Piles should be used (or all heavily <br /> loaded and/or setticment-sensitive structures planned for the site. It is our opinion that an augercast pile <br /> foundations will provide adequate support of the structures and will be cost effec[i��e to construct. <br /> i Accardingly, aur recommenda[ions for augereast pile capacity are pro��ided below. <br /> Augercast niles are consWcted using a continuous tlight hollow stem auger attached to a set of leads <br /> supported by a crane. The first step in the pile casting process consists of lrilling the auger into +he <br /> ground tu the specified tip elevation of the pile. Grout is then pumped Ihrough the hollow stem auger <br /> upon steady withdra�val of the auger and replaces the soils an the (lights of the auger. The tinal step is to <br /> install a steel reinforcing cage and typically a center har into the column of fresh grout. The benetit ot <br /> using augercas[ piles is tha! the auger provides support for the soils during the pile installation process, <br /> thus eliminating the need for tcmporary casing or drilling fluid. <br /> Axial Capacities <br /> A.rial pile capacity in compression a�ill be developed from end bearing and from frictiunal resistance in <br /> the medium dense sand soils underlying the site. Uplift pile capacity will afso be developed from <br /> Gictional resistance in these soils. <br /> �, To achieve suitable bearing we recommend a minimum embedment of 10 feet into the medium dense <br /> sand laycr underlying the site. Based on our subsurface explorations, we recommend that the piles extend <br /> at least 40 feet bclow propused final site grades (Elevation -25 fee[) to extend below the upper layer of <br /> � <br /> I FifeNo.8987-00�(-00 PpS�'�3 �iEOENGIHEERS� <br /> Or�oLcr l I,d006 <br /> ! <br />