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.lunc l. 2.008 <br />lluplex I�tiilding <br />I.&A .lob No. 8n055 <br />1'agc S <br />proteet the subgrade soils from disturbance by construction truf7ic. Silt fenecs should be erected <br />along the downhill boundarics of the sitc to prevent sediment bcing transported onto adjoining <br />properties or the strect by storm runoff. 7'lie bottom of silt fencc filter fabric should be anchored <br />in a trench filled with gravcl. <br />GXCAVA'TION AND FILL SLOPI'sS <br />� Under no circumstanee should cxcavation slopes be greatcr than the limits specified by local, <br />state and federal saf'ety rcgulations if workers have to perfom� construction work in excavated <br />� areas. Unsupportcd temporary cuts greater tha�i 4 Ceet in height should be no steeper than l l L• 1 V <br />in the surficial fill, tupsoil and weathered soils and may be vcriical in the underlying very-dense <br />� fresh till soils provided thai thc overall depth of e�cavation does not excecd 10 feet I'ermanent <br />cet banks should be no steeper tha�� 2-li2FI:1V in the surficial fill and topsoil, no steeper than <br />� 2H:1V in the wcathered soil,, and no stecper Uian 1-1/21I:1V iu the underlying, very-densc fresh <br />till soils. <br />Pemianent fill embankmcnts rcquired to support siructural or traftic loads should be constnicted <br />with compacted structural fill placed over undisturbed, proof-rolled, firm, native soils afrer t:ie <br />suriicial unsuitable soils are completely stripped. Permanent lill placed ovcr sloping ground <br />steeperthan 2U% grade should be structurally retained. Sloping ground steeperthan 15% grade <br />should be benched wiili vertical steps not eaceeding 4 feet after stripping of the surlicial <br />unsuitable soils and prior to constructing permanent fill embankment. "Che slope of pemianent <br />fill embankments should be no steeper than 2fI:1V. Upon completion, the sloping face of <br />permanent fill embankments should be d�oroughly compacted to a non-yielding sta[e with a hoe- <br />pack. The soif wiits and the stability of cut slopes should be verified by a gcotechnical engineer <br />during cxan�ation. <br />LIU & ASSOCIATES, INC� <br />