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nugust 18. 2004 <br />Mr. Jim Thomas <br />fScl�-cdcrc Lols 32 anJ _lJ <br />L&A Job No. 4A088 <br />Pagc 9 <br />b�nks, if required, should nut he slecper than 2-I/21I: I V. Thc soils and tlte slability of cut slopes <br />should bc obscrvcd and vcrilicd by a g�otcchnical cnginccr during cxcavation. <br />Pcnnancnt lill cmb.inkincnts rcyuircd lu suprorl stiuctural or traflic loads shoul� bc conslrucicJ <br />with compacicd structural fill placcd ovcr prooGrollcd undisturbcd, n�tive, vcry stiff lo hard silt <br />or dense Gsperance Sand deposits afler the sur�icial unsuitable soils are strippcd. Permancnt fill <br />to be placed on slopes steeper than IS% grade should be relaincd structurally. Sloping ground <br />over which fill is to be placed should be bcnched wilh vcrtical steps no more Ihan 4 fecl high <br />:ilier stripping ul unsuitablc surficial sails. Thc slopc of permancnt fill cmbankmcnl should nol <br />be steeper Uian 211:1 V. llpon completion, the sloping face of permancnt fill embanl:ments <br />should bc thoroughly compacted ro a non-�•iclding statc with a hoc-pack. <br />I hc abovc rccommcnded cut and f711 slopes are undcr the assumption that groundwater secpagc <br />will not be encountered during construction. If groundwater seepage is encountered, the <br />construction sho�ld bc immcdiately haltcd and the slope stabilily re-evaluateJ. The slopes may <br />have to be Ilauened and other mcasures laken to stabilizc the slopcs. Sur(ace runoff should not <br />bc allowcd to Iluw uncontrollcd ovcr thc �cip of cul or fill slopcs. Pcrmancnl cut slopes or lill <br />cmb.mkmcnts shouW be sceded and cegetated as soon as possible for erosion prolec�ion and <br />lang-tenn slabilily, and should bc covcrcd with plastic shccls, as requircd, to protcct lhcm from <br />ciusiun by stornnvatcr imlil Ihc �cgrt.uion is fully c::tahlis6cd. <br />ti'I'RU<"1'UItAI, I�Ii.I, <br />Structural lill is Ihc lill placeJ undcr roadway pavcmcnts, footings, slabs-on-gradc, and bchind <br />rctaining walls where it suppoil loads. Structural fill should consist ofclean soils Gee o(organic <br />and other delcicrious suhstances and with pariicles nol larger Ihan four inches. Struclural fill <br />shuuld hare a moisturc cnntent within onc percent of its optimwn moisture content al the time of <br />LIU & ASSOCIAT�S, INC. <br />