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Project No. JB -314 24 March 2003 Page 9 6.2.2 Cast -In Place Pier/Deep Isolated Footing As an alternate, the canopy structure and sign/monuments may be supported on drilled, cast -in place pier foundation or a deep isolated footing system established on the native soil. The foundation should be designed according to the criteria presented in Table 4. Table 4 FOUNDATION DESIGN CRITERIA CAST -IN PLACE PIER/DEEP ISOLATED FOOTING Diameter or Width Depth' Allowable Bearing Capacity' Lateral Loads Criteria Minimum 18 in. Minimum of 6 feet into acceptable soil or as determined by our representative during drilling. 5,000 psf 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. To reduce the potential for differential settlement, we recommend that all excavations be cleaned of slough and loose material prior to placing steel reinforcement and concrete. The foundation should contain steel reinforcement over their entire length with reinforcement as directed by the Project Structural Engineer according to applicable Uniform Building Code (UBC) or American Concrete Institute (ACI) standards. Care should be taken to avoid "mushrooming" at the top of the pier when placing concrete. We recommend that concrete be placed in the foundation excavations within 24 to 48 hours after the time of acceptance by our representative. We recommend that our representative observe pier drilling or deep excavations to confirm the soil characteristics of the materials encountered. Depending on the time of year of drilling and the foundation excavation location, groundwater may be encountered in the pier hole. In such cases, the excavation should be cleaned of loose slough and either pumped dry just prior to pouring concrete or tremied mr,orb,macher Engineering, Inc.