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All pile caps supported by piles that penetrate less than ten feet below cutoff level or less than ten feet below ground level shall be braced against lateral movement. Such bracing may consist of connection to other pile caps that encompass piles embedded more than ten feet below those levels. The heads of the piles shall be fixed in the cap. In no case shall more than fifty percent of the piles in the foundation of any building penetrate less than ten feet below cut-off level or less than ten feet below ground level.

Exception: The requirements of this section shall not apply to caisson piles.
1808.7.4.1 Piles Located Near a Lot Line
Where the embedded length of piles located near a lot line would be reduced to less than ten feet by excavation of the adjacent site to a depth of ten feet below the nearest established curb level, the provisions of Section 1808.7.4 shall apply.
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