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t ; <br /> April 23, 2007 <br /> Mr. Scott Anderson <br /> L&A Job No. 6A 12G <br /> Pagc 7 <br /> areas. Unsupported temporary cuts greater than 4 fcet in height should be no steeper than 1I-I:l V <br /> in the surficial topsoil and weathered till soils and may be vertical in the underlying very-dense <br /> tresh till soils, provided that the overall depth of excavation does not exceed 10 fcet. 1�he soil <br /> units and the stability of cut slopes should bc verificd by a geotechnical engineer during <br /> excavation. <br /> The abovc recommended cut slopes arc under the assumption tha, groundwater scepage would <br /> not be encountered during construction. If groundwater seepage is encountered, the consWction <br /> should be immediately halted and the slope stability re-evaluated. "fhe cut slopcs may have to be <br /> Flattened und other measures taken to stabilize thc slopes. Surface runoff should not be allowed <br /> to ilow uncontrolled ovcr the top of cut slopes. Cut slopes should be covered with plastic tarps, <br /> as requireJ, to protect them f�om erosion by stormwater. <br /> STRUCI'URAL FILL <br /> Structural fill is the fill that support strucWral or tratlic load. Structural fill should consist of <br /> cican soils with particles not larger lhan four inches and should be frce of organic and other <br /> deleterious substances. Swctanl fill should havc a moisturc content within one percent of its <br /> optimum moislure content at the time of�lacement. The optimum moisture content is the water <br /> content in the soil that enable thc soil to be compacted to thc highcst dry density for a given <br /> compaction e�Tort. Thc on-site cleun till soils may b�: uscd for structural fill only under fair <br /> weather conditions when thcir moisturc wntent can be contraUcd to near optimum moisture <br /> content at the time of placement. Imported material to be used �s structural fill, should be clean, <br /> frcc-draining, granular soils containing no more than � perceni by weight finer than the No. 200 <br /> sicve based on the fruction of the matcrial passing No. 4 sicvc, and should have individual <br /> particics not largcr than fuur inchcs. <br /> Lltl & ASSOCIATES, INC. <br />