Tract B ofthe Villa Alegre Development
one-third for short-term loads due to wind and earthquakes. If it is not feasible to implement the site grading, drainage, and landscaping recommendations presented
herein, an alternate foundation system may contacted for additional recommendations.
The base of exterior footings should be embedded a minimum of twenty-four
inches below lowest adjacent grade. embedded a minimum of twelve inches
The base of interior footings should be below finish pad grade. Spread and strip
footings should be a minimum of twenty-four and eighteen inches respectively. However, local building codes may require greater dimensions. to Section R403 .1.1 of the 2006 International Building Code.
Lateral foundation loads will be resisted by a combination of passive soil pressure against the sides of footings and friction along the base. A passive soil resistance of 300 pounds per cubic foot may be utilized for design. Frictional resistance may be determined by multiplying foundation dead load by a coefficient of friction ofOAO.
The site soils should be overexcavated as necessary to allow placement of a minimum of three feet of structural fill on all building pads. Structural fill should extend a minimum of five feet laterally beyond the building perimeter. Prior to fill placement and following footing excavation, the natural soils should be scarified to a depth of eight inches and moistened to near optimum moisture content (±3%). The exposed soils should then be compacted to a minimum of 95% of maximum
V &A Project No.: 09-1-102