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Page 10 - #4220 91-1043 <br />... , <br />" settlement should be less than 1" and differential settlement should be less than 1/2". <br />` :; These settlement figures are typically considered tolerable for the planned type of <br /> construction. <br /> We recommend the planned addition be supported completely independent of the <br /> i <br /> foundation members for the existing building. We understand the foundations for the <br />�� existing building were designed to rest on soil having an allowable bearing capacity of <br /> 2000 psf. Furthermore, based upon the compaction levels specified during placement of <br /> fill for support of the existing structure, it is our judgment that the in-place soils beneath <br />;.- the existing foundations would probably not be suitable for support of an increased <br /> foundation loading. <br />,_ 3.4 Floor Slab Support <br /> In our opinion the compacted fill system placed for structural support should be suitable <br />_ for support of slab-on-grade construction. Fill, including interior wall backfill, should be <br /> compacted to 98% of Standard Proctor Density. We do recommend the upper 6" of soil <br /> below the floor consist of a free-draining sand with less than 10% passing the #200 <br />`_ sieve. The free-draining sand should provide a capillary moisture break beneath the slab <br />� to minimize transmission of moisture to the slab. <br />�� <br />