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Aulik Associates <br /> Proj ect BL-04-06716 <br /> October 11, 2004 <br /> � Page 9 <br /> borings indicate that at the anticipated excavation depths a majority of the existing fill soils and native <br /> sand soils in the sidewalls of the excavations will be Type C soils and the under Department of Labor <br /> Occupational Safety and Health Adrninistration(OSHA)guidelines. <br /> Temporary excavations should be constructed at 1 1/2 feet horizontal to every 1 foot vertical within <br /> excavations. Slopes constructed in this manner rnay still exhibit surface sloughing. If site constraints do <br /> not allow the construction of temporary slopes with these dimensions then temporary shoring may be <br /> required. <br /> D.2. Observations <br /> A geotechnical engineer should observe the excavation, footing and slab subgrades to evaluate if the <br /> subgrade soils are similar to those encountered by the borings and adequate to support the proposed <br /> construction. Oversize of excavations below perimeter footing grades should be checked. These <br /> observanons should be conducted prior to placing backfills, fills or forms for footings. <br /> After excavating for footings,we recommend that tests be conducted on the subgrades to evaluate if the <br /> bearing capacity is at least 2,000 psf. Typical instruments used for these tests include hand augers, <br /> penetrometers and sample tubes. <br /> D.3. Backf'ilIs and Fills <br /> Site soils which will be excavated and reused as backfills and fills appear to be near or above assumed <br /> optimum moisture content. We anticipate it will be necessary to dry or moisture-condition these soils to <br /> achieve the recommended compaction. We recommend that backfills and fills be placed in lifts not <br /> exceeding 4 to 12 inches, depending upon the size of the compactor and material used. <br /> D.4. Testing <br /> We recommend density tests of backfills and fills placed beneath footings, floor slabs, and along <br /> foundation walls. Samples of proposed backfill and fill materials should be submitted to our testing <br /> laboratory at least three da,ys prior to placement for evaluation of their suitability and determination of <br /> their optimum moisture contents and ma�cimum dry densities. <br />