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Aug. 31. 2004 3:46PM CHARLES MORGAN & ASSOC. No, 0044 P. 5 <br /> ' <br /> • ' Grandview Homes, LLC JN 99090 <br /> February 16, 1999 Page 3 <br /> � I,YI`- oV`..�dSs;+•sr wsll• I••tl •. <br /> Beurink.e.91 dit bil R>„:;.! •i.w.:Bea liliriresftire'.. ° <br /> Placed directly on competent, 5,000 psf <br /> • native soli(less than 3 feet into <br /> glacial till) <br /> Placed directly on competent, 8,000 psf <br /> native soil(greater than 3 feet <br /> into glacial till} <br /> Where:(i)piffle pounds per square foot. <br /> A•one-third•increase In these design bearing pressures may be used when considering short-term <br /> wind or seismic loads. For the above design criteria, it is anticipated that the total post-construction <br /> settlement of footings founded on competent, native soil, or on structural fill up to 5 feet in <br /> j thickness,will be about one-half inch. <br /> Lateral loads due to wind or seismic forces may be resisted by friction between the foundation and <br /> the bearing soil, or by passive earth pressure acting on the vertical, embedded portions of the <br /> foundation. For the latter condition, the foundation must be either poured directly against relatively <br /> level, undisturbed soil or be surrounded by level structural fill. We recommend using the following <br /> design values for the foundation's resistance to lateral loading: <br /> 1 Parameter •.(>',oti ,: .c,v;.;p '• ' _ '; Design Value•;• : <br /> 'v <br /> Coefficient of Friction 0.40 <br /> t Passive Earth Pressure 400 pet i <br /> Where:(I)pcf is pounds per cubic foot,and pi)passive earth <br /> pressure is computed using the equivalent fluid density. <br /> If the ground in front of a foundation is loose or sloping, the passive earth pressure given above will <br /> not be appropriate. We recommend a safety factor of at least 1.5 for the foundation's resistance to • <br /> lateral loading,when using the above design values. <br /> Seismic Considerations <br /> 1 1 <br /> The site is located within Seismic Zone 3, as Illustrated on Figure No. 16-2 of the 1997 Uniform <br /> Building Code (UBC). In accordance with Table 16-J of the 1997 UBC, the site soil profile is best <br /> represented by Soil Profile Type Sc (Very Dense Soil). The site soils are not subject to seismic <br /> liquefaction due to their density. <br /> Slabs-on-Grade <br /> The building floors may be constructed as slabs-on-grade atop glacial till, or on structural fill. The <br /> subgrade soil must be in a firm, non-yielding condition at the time of slab construction or undersiab <br /> fill placement. Any soft areas encountered should be excavated and replaced with select, imported <br /> structural fill. <br /> ( (//....5 <br /> Gf;OTECN CONSULTANTS.INC. '\ <br /> i <br />