3723 RUCKER AVE Geotech Report 2018-01-02 MF Import

�� The following sections of this report present more detailed recommendations � for the various geotechnical engineering aspec[s of the project which should � ba incorporated into the project design and construction. � ' Fuundations � The proposed building should be supported on continuous and/or isolated apread footings bearing on a minimum of two feet of structural fill placed below footing bottoms. The structural fill should be placed after removing the existing fills in the footing areas to the designared depths. The removal should extend two feet below footing bottoms as well ns tao .�et laterally outside the footings in both directions. All footings should extend to a minimum dep[h of 18 inches below the loiaest adjacent final grade. Anq interior footing areas should also be overexcava[ed and replaced with structural fill. T'he rockery adjecent to the east and north sides of the building may complicete the overexcavation process. The perimeter footings along thrse sides of the building should be pleced at a sufficient depth so that they impose no additional lateral pressure on the existing rockery. We auggest the footings be based at a level at or below the bese of the rockery. The recommended overexcavation depth and width for foo[ing support should then be provided below [het footing level. Continuous footings bearing on structural fill may be designed for an allowable beering pressure of 1,500 pounds per squere foot (psf), for dead plue live loeds. A minimum width of 12 inches should be used for continuous footings. Individual spread footings mny alsa be designed for a� allowable bearing pressure of 1,500 paf and should heve a minimum size of 18 inches. A one-third increase in the above bearing pressures may be used when cansidering wind or seismic loads. All footings should be provided with ateel reinforcement in accordance with structural requirements. To verify that footing bearing surfaces are satisfactory, that excessive disturbance does not occur during excavation, and to observe compliance with our recommendations, we recam�end that all foo[ing excavations be examined by our representative prior to placing concrete. A minimum of tvo aorking days notice should be gLven us prior to examinetion of foundation excavations. Settlements We an[icipate that the maximum total set[lements for the building supported on an adequately compacted structural fill mat vill be less than one inch. The maximum long-term differential settlement should be less than one-half inch. Projec[ No. T-233, Pa�e 5