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i� : . <br /> I SFIANNON b WI�SON.NVC. <br /> to a depth of I foot and to at least 95 pereent of the Modified Proctor maximum dry deae;ty,as <br /> Idete�mined by ASTM Designation D-1557,Method C or D. Areas that cannot be compacted <br /> properly or that are delincated to be soft, loose,or yielding by t}�e pmof-rolling opaations should <br /> � be further compacted,removed and reconditioned,or replaced with swctural 611 as outlined in <br /> Section 4.2 <br /> � 4.2 Fill Pl�cemeot aad Compacdon . <br /> i Ali fill and backHil placed beneach ballfields,roadway,perking lots, footings, floor alaba,and <br /> ; otha areas where settlements are to be minimized,should consist of compacted structuial fill. <br /> I The existing non-organic,g�aautar fill soils that would be encountered in the excavation areas <br /> ° � could be re-used as structural fill,providing that: (1) it is placed during dry weather,(2)the <br /> moisture content af the material is adjusted to within t2 pe�ent of its optimum for compacdon, <br /> Iand(3)the material can meet the required minimum compaction criteria. If on-aite soils are used <br /> as structural fill and,afta placement they become wet and unsuitable,they should be removed <br /> j az►d rep�acod with shuctural fill—either imported or suitably d.ied on-site materials derived from <br /> ` excavations. Compacted on-site soils should be protected from degradadon. Protxdon of the <br /> coi►ipacted areas can be accomplished by placing a clean sa�;d and gravel cover layer and <br /> � compacting it to a dense and unyielding condidon. <br /> IImported structural fill material shuuld consist of a reasonably well-graded(from fine to coarse) <br /> sand or sand and gravel, free of organics and debris,with a maximum pazticle size of about 3 <br /> j inches. It should contain not more than 30 percent fines(material passing the No. 200 mesh <br /> � sieve),by weight,based upon wet sieving of the minus 3/4inch fracNon. If eazUi ork takes <br /> Iplace in wet weather or during wet condidons, no matter what time oFthe year,the fines content <br /> of all structural fill material should be no more than 5 percent. Also, the recommendations <br /> � presented in Section 4.3 should be followed. <br /> ' All stcuctural fill should be placed in uniform layers and compacted to a dense,unyielding <br /> � condition. Proof-rolling should also achieve a dense, unyielding condition. The following <br /> � densities are recommended for various locations requuing structura] fi1L• <br /> � <br /> � <br /> ) <br /> I <br /> W8628-01.ryVwp/sjm W8628�Ol ^` <br /> I 4 Y� <br />