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ANPT Engineering, Inc. <br /> Western Wireless Corporation <br /> AMPT Job No, WA99.993 <br /> April 1. 1998 <br /> Page 6 <br /> presented in Table 1, includes a safety factor of 1.5 or more. We anticipate that adequate pier embedment <br /> for end bearing, uplift and lateral resistance can generally be obtained within the limits of our exploration <br /> of 30 feet. <br /> Table I <br /> Allowable End Bearing Capacity <br /> Depth (feet) Allowable Bearing Capacity(tsi) Limiting Point Resistance(tso <br /> 15-30 6.5 D/B 35 TSF <br /> Notes: D=the embedment depth(in feet) into the bearing layer. <br /> B=pier diameter(feet). <br /> Frictional Capacities: For frictional resistance of the drilled piers, acting both downward and in uplift, we <br /> recommend using the allowable skin friction value listed in Table 2. We recommend that frictional <br /> resistance be neglected in the uppermost 2 feet below the ground surface. The allowable skin friction <br /> value presented includes a safety factor of 1.5. <br /> Table 2 <br /> Allowable Skin Friction Capacities <br /> =2-10 <br /> Allowable Skin Friction (tsp <br /> 0.0 <br /> 0.20 <br /> 0.70 <br /> Lateral Capacities: For design against lateral forces acting against the drilled pier, two methods are <br /> typically used. The parameter used to select the appropriate design method is the length to ;iier stiffness <br /> ratio UF, where I is the pier length in inches, and T is the relative stiffness factor. The relative stiffness <br /> factor(T)should be computed by: <br />