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Project No. JB-569 20 June 2006 Revised 78 October 2006 Page 11 Table 3 FOUNDATION DESIGN CRITERIA FOR CAST-IN PLACE PIERS Item Criteria Diameter Minimum 12 in. Spacing Minimum 3 pier diameters, center to center Depth' Minimum of 10 feet, or 3 feet into native soil, whichever is deeper, as determined by our representative during drilling. Maximum spacing to be determined by the Project Structural Engineer. Pier depths are expected to be 10 to 15 feet in depth. Allowable Friction Value2 Allowable friction value of 500 psf, which may be increased by 1 /3 for wind and seismic loads Lateral Loads See Section 6.3 "Lateral Load Design Criteria 1 . Depth of foundation embedment is measured from the lowest adjacent soil grade to the bottom of the pier hole. 2. The recommendations above may be increased by one-third for wind and seismic loads. - Care should be taken to avoid "mushrooming" at the bottoms of the grade beam or at the tops of piers when placing concrete. We recommend that concrete be placed in all pier holes within 24 to 48 hours after the time of acceptance by our firm's representative. We recommend our representative observe pier drilling to confirm the competence of the materials in the pier holes. Depending on the time of year of drilling and the pier location, groundwater may be encountered in some pier holes. In such cases, the pier holes should be cleaned of loose slough and either pumped dry just prior to pouring concrete or tremied with concrete to "float" the water above the concrete with the tremie hose maintaining a minimum 5-foot head of concrete at all times during hose removal. ~ orbmacher Engineering. Inc.