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Lutzky Associates Development. LP - Geotechnical investigation <br />MACTEC Project 4953-03-2631 <br />September 18.2003 <br />Where piles in groups are required, the piles should be spaced at least 3 pile widtlon centgrs. If the <br />piles are so spaced, no reduction in the downward capacity of the piles due to group action need be. <br />considered in design. <br />Settlement <br />The estimated settlement of the proposed Data Center, supported in the manner recommended, is <br />on the order of M inch or less. Differential settlement between adjacent columns is expected to be <br />on the order of'A inch or less. <br />Lateral Pile Capacities <br />Lateral loads may be resisted by the piles, by soil friction on the floor slabs, and by the passive <br />resistance of the soils. We have calculated the lateral load, maximum moments, and depths to zero <br />moment for a 12- and 14-inch-square piles using the computer program LPILE by ENSOFT, Inc. <br />We have performed the computations for a free head and fixed head pile. Our computations were <br />performed for pile head deflections of'/1 inch and M inch. The results are summarized in the table <br />below. The capacities presented in the table below are for pile lengths equal to or greater than 20 <br />feet below the bottom of pile cap. <br />Lateral Load Design Data <br />12-inch-square Driven Pile <br />Pile Head Deflection (inches) <br />M M <br />Pile Head Condition Free Fixed Free Fixed <br />Lateral Load (kips) 13 35 22 47 <br />Maximum Moment (kip-ft) 32 98 61 158 <br />Depth to Maximum Moment (ft) 4 0 4 0 <br />Depth to Negligible Moment (ft) 12 14 12 14 <br />17