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MOORE & TABER NORTHERN CALIFORNIA <br /> CONSULTING ENGINEERS AND GEOLOGISTS <br /> -5- <br /> Conditions at boring locations indicate support can <br /> be achieved for visualized construction. The variable thickness <br /> of disrupted surficial soils and high expansion potential of <br /> upper-unit soils will be a consideration in design and con- <br /> struction of structure support. Minor seepage/sloughing with <br /> foundation excavations penetrating areas of semicompact silty <br /> and clayey sand would not be unexpected. <br /> The boring data are interpreted as indicating structure <br /> support to be likely available on typical reinforced concrete <br /> footings penetrating into undisturbed native soils (i.e. below <br /> the zone of disturbance/fill. Alternately, structure support <br /> may be available on drilled piers acting mainly in end bearing <br /> (say, at depth 5-ft minimum) or mainly in friction (say, at <br /> depth 15-20 ft) . The possibility of deeper piers encountering <br /> local seepage/soil inflow should be recognized--and evaluations <br /> at specific sites. The potential for differential movements <br /> between elements supported on piers and floors/other elements <br /> supported on native (expansive) soils should be considered <br /> in design , as should the potential for floor cracking due to <br /> lateral moisture migration in expansive soils (see below) . <br /> All site grading, including reprocessing of surficial <br /> cultivated soil layer and any other disturbed soils, should <br /> be performed in accordance with the attached "Guide Specification" <br />