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AirTouch Cellutar 7-91 M-11905-0 <br />3 Octo6er 1997 Pape 12 <br />n- i Soils: The existing silty sands and sands with varying amount of silt and gravel <br />encountered throughout the entire depth explored at the site, appea, suitable for reuse as <br />structural fill, provided that they are free of organics or other deleterious material anr� that <br />the moisture content is near optimum moisture. <br />� Placement and Comoaction: Generally, CDF and lean-mix concrete do not require special <br />placement and compaction procedures. In contrast, pit-run, sand, crushed rock, soil <br />mixtures, on-site soils, and recycled materials should be placed in horizontal lifts not <br />� exceeding 8 inches in loose thickness, and each lift should be thoroughly compacted with <br />a mechanical compactor. Using the Modified Proctor maximum dry density (ASTM:D- <br />� 1557) as a standard, we recommend that structural fill used for various on-site <br />applicatic�ns be compacted to the minimwr densities presented in Table 6. <br />TABLE 6 <br />RECOMMENDED COMPACTION REQUIREMEWTS <br />Fill Application Minimum Compaction <br />(ASTM:D-1557) <br />Wall and footing backfill 90 �+escent <br />Footing subgrade 90 perc.=nt <br />Gravel driveway subgrade (upper 1 footl 95 percant <br />Gravel driveway subgrade (below 1 foot depth► I 90 percent <br />�_ Subarades and Testina: Regardless of location or material type, all structural fill should be <br />placed over firm, unyielding subgrades. We recommend that an AEE representative be <br />( allowed to observe all subgrades before fill placemont begins, and to perform a series of <br />� in-piace density tests during structural fill placement. 1�i this way, the adequacy of soil <br />compaction efforts may be evaluated as earthwork progresses, to minimize construction <br />� delays. <br />➢�YtM41Y06�0 <br />