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r <br /> � Table I <br /> Recommended Compaction Cri[eria for S[ruc[ural Fill <br /> IProject .area *Minimum Percent Compaction <br /> Beneath Fuotings aitd Slabs 95 <br /> IRoadway and Parking �reas <br /> Within 2 feet of subgrade surface 95 <br /> I Lower portions oE [ill 92 <br /> Earth Dikes 92 <br /> I Behind Below-Grade I;alls **90 <br /> *Percent of r�aximum dry density determined in accordance with AS'CM D-I557. <br /> I **Limit cumpaction to between 90 and 92 percen[. <br /> Fill pl�ced in landscape and waste-fill areas need only be compacted to the <br /> Idegree required E�r traf[icability oP cons[ruction equipment. <br /> All s[ruc[ural fill aaterial should be Eree of debris, organic contami- <br /> I nants and cock fragments larger than 6 inches. Particle sizes larger than 3 <br /> inches should be excluded Erom [he top foot of fill. The suitabLli[y o[ <br /> I matec:al for use as s[ruc[ural fill will depend on the gradatton and muisturc <br /> con[ent of [he soil. As Che amoun[ uf fines (ma[erial passing \o. 200 sieve) <br /> increases, soil becumes increasingly more sensi[ive [o small changes in mois- , <br /> Iture content and adequate conpaction becumes more difficult to achieve. We � � <br /> recommend [hat s[ruc[ural fill contain no more than about S percent fines for '� � , . <br /> Iplacemen[ in wet weather. Yl�e percent fines could be higher for placement in � <br /> dry weather, providing that the fil.l ma[erial is mois[ure-conditioned as <br /> � necessary Eor proper compaction. .�, <br /> The on-site soils cunsis[ primarily of sil[y sand (glacial till) depoaits <br /> with some clean outwash sand and gravel deposits along the drainage to the � <br /> ! west. In our opinion, the clean uutwash sand and gravel deposits can be used <br /> as structural fill in mose weather condiCions. The [ill deposits contain a <br /> � substantial a�auunt of Eines and should be used as structural [ill only during <br /> dry weather c:hen [heir moisture content can more easily be wn[iolled <br /> IPeat and Eine-grained si1 [ deposLts are present in some local bog areas <br /> across the si[e. The peat snd sitt are no[ suitable for use as structural <br /> � fill. [Je recommend that these soils be placed in fills requiring lit[le or <br /> no compac[ion, such as lardscane areas, or be wa�ted off-siCe. All exis[ing <br /> vaste fill. on [he s�.te sh�uld be handled in a similar manner. <br /> I �� <br /> - 7 - �'7@OEI191n@@fS � <br /> IIncorporoted � <br />