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April 7, 2005 <br /> Mr. Don Lcvin <br /> L�C A Joh No. SA037 <br /> Pagc 8 <br /> arcas. Unsupportcd tcmporary cuts grcatcr than 4 fcet in hcight should bc no stceper than 1 H:I V <br /> in thc surficial topsoil and wcak soils in thc root zonc, ancl no stccper than 1/2H:IV in thc <br /> undcrlying dcnsc sand and/or hard silt soil laycr. Thc soil units and thc staUility of cut slopcs <br /> should bc vcrilicd by a �cotcchnical cnginccr during excavation. <br /> 'I'hc aho��c rccommendcd cut slopcs arc imdcr thc assumption that ground�eatcr scepagc would <br /> not bc cncountcrcd during constn�clion. If ground�vatcr secpagc is cncountcreJ, thc constniction <br /> should bc inuncdiatcly haltcd and Uic slopc stability rc-evaluatcd. Thc cut slopcs may havc to hc <br /> Ilattcncd and othcr mcasures takcn to stabilizc thc slopcs. Surfacc runoff should not bc allowcd <br /> to (lo�v unconlrollcd ovcr thc top of cut slopes. Cut slopcs should hc covcrcd with plastic tarps, <br /> as rcquired, to protccl thcm from crosion by stomi���atcr. <br /> S'1'RUC7'URAL FII.I. <br /> Siructural fill is thc :�II that support su�uctural or u�affic IoaJ. Structural lill should consist of <br /> cican soils ���ith particl.:s sot largcr Aian four inchcs and should Uc Gce of organic and othcr <br /> dcictcrious substanccs. Siructural lill should havc a moisturc contcnt within onc perccnt of its <br /> oplimum moisturc contcnt at thc timc of placemcnt. Thc optimum moiswrc contcnt is thc a�atcr <br /> contcnt in thc soil Ihat cnablc thc soil to bc compactcd to thc highest dry dcnsiry for a givcn <br /> compaclion cffori. Thc on-sitc cic:m till soils may bc uscd for stnictural fill only undcr fair <br /> ���cathcr conJitions whcn Ihcir moisturc contcnt can bc controllcd to ncar optimum moisturc <br /> content at thc timc of placcmcnt. hnporteJ matcrial to bc uscd as structural fill, should bc dcan, <br /> freo-draining, granular soils containing no morc than 5 percent by wcight fincr than thc No. 200 <br /> sicvc bascd on thc fi•aclion of thc matcrial passing No. -1 sic��c. and should ha��c indi��idual <br /> particics not largcr than lour inchcs. <br /> LIU Sc ASSOCIATES, INC. ,% � � ��� <br /> � <br />