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8 <br />f Two types of foundations should be considered for the new <br />addition. <br />A. Shallow RaftJype-Eoundatioj- - <br />If some small settlements of the addition and possibly the <br />existing structure can be tolerated a shallow raft-type <br />foundation could bo used. The raft-type foundation should consist <br />of a thickened-edgo slab with intermediate stiffener ribs in both <br />directions. This reinforced concrete slab could be used as the <br />floor of the addition, but then would not match the existing <br />floor level. Alternatively a built-up wood floor could be <br />constructed above the foundation slab, with shallow air space <br />under, to create matching floor elevations. <br />All obviously organic surface topsoil fill should be removed <br />from the proposed building pad area. We strongly recommend that <br />no now fill should be added, so that new loading on the subsoil <br />is minimized. The exposed sandy subsoil should then be thoroughly <br />surface compacted with a small, self-propelled drum roller <br />operated in its non-vlbratory mode, so as to minimize distress to <br />the existing building. A total of 50 complete coverages of the <br />roller is recommended. <br />O <br />6975H«v65N£ <br />rO <br />MowiMpoAt. HVS5412