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.. � C C� <br />Intracorp <br />July 16, 1998 <br />E-3592-620 <br />Paye 5 <br />Based on the results of our study, it is our opinion the proposed buildinys can be <br />supported on conventional spread and continuous footinp foundations bearing on the <br />structural fill used to raise site grades. Exterior faundation elements should be pleced at <br />a minimu�� depth of eighteen (18) inches below final exterior yrade. Interior spread <br />fuundations can be piaced at a minimum depth of twetve (12) inches below the top of <br />slab, except in unheated areas, where interior foundation elements should be founded at <br />a minimum depth of eighteen (18) inches. <br />With foundation support obtained as described, for design, an allowable soii beariny <br />capacity of two thousand flve hundred (2,500) psf for structural fill can be used. <br />Cuntinuous and individual spread footings should have minimum widths of eighteen (18) <br />and :wenty-four (241 inches, respectively. Loading of this magnitude would be provided <br />with a;heo�etical factor-of-safety in excess of three against actual shear failure. For <br />short-term dynamic loading conditions, a one-third increase in the above allowable beariny <br />capacities can be used. <br />Horizontal loads can be resisted by friction betwean the base of the foundation and ths <br />supporting soil and by passive soil pressure actinp on the face of ths buriad portion of th� <br />foundation. For the latter, the foundation must be poured "neaY against the competent <br />native soils or backfllled with structural flll. For frictional capacity, a coefficient of .35 <br />can be used. For passive earth pressure, the available resistance can be computed using <br />an equivalent fluid pressure of three hundred fifty (350) pcf. These lateral rasistance <br />vaiues are altawable values, a factor-of-safety of 1.5 has been included. As movament <br />of the foundation element is required to mobilize full passive resistance, the passive <br />resistance should be neglected if such movement is not acceptable. <br />With structural loading as expected, total building settlement in the range of one inch is <br />anticipated with differential movement of about one-half inch. Most of the anticipated <br />buiiding settlements should occur during construction as dead loads are applied. <br />ErM CarWene. Y�e. <br />