5109 SOUND AVE 2017-08-02 - Laserfiche WebLink

July 21, 2014 Two Single-Family residences L&A Job No. 14-065 Page 16 The lagging boards should be shimmed to leave 1/4-inch gap between boards and wecp holes drilled in the bottom boards to allow water to seep through. A layer of non-woven filier fabric liner, such as Mirafi 140NS ar approved equal, should be tacked onto the back of the lagging boards to retain soil while allowing water to flow through. Voids, if any, behind the lagging boards should be fillcd with clean free-draining coarse sand and tamped to have a tight contact with the lagging boards. BUILDING FOUNDATIONS Conventional footing foundations may be used to support the proposed new residences. The footing foundations should be constructed on or into the underlying, hard clayey silt soil and/or medium-dense advance outwash sand deposit, or on struetural fill placed over these competent basal soils. The eaposed soils in footing trenches should be compacted to a non-yielding state with a vibratory compactor and the structural .fill should be placed and compacted per recommendations in the STRUC"I'LTRAL FILL of this report. Water should not be allowed to accumulate in excavated footing trenches. Disturbed soils in footing trenches should be completely removed prior to pouring concrete for the footings. lf the above recommendations are followed, our recommerided design criteria for footing foundations are as follows: • The allowable soil bearing pressure for design of footing foundations, including dead and live loads, should be no greater than 3,000 psf if constructed on or into above competent basal soils, and no greater than 2,500 psf if constructed on compacted structura] fill placed over the competent basal soils. The footing LIU & ASSOCIATES, INC.