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( <br /> I `�HANNON&WILSON,INC. <br /> 1 <br /> like soils, the small confines of the trench, and the limited time-frame for aeration. <br /> � Therefore, the use of imported structural fill should be andcipated. <br /> I 8.4.6 Wet Weather Farthwork <br /> I <br /> i As shated before, the on-site soils are moisture sensitive. Thesc soils ace easily <br /> � disturbed by construction equipment and may degnde W a slurry-like consistenry when <br /> subjected to construction tra�c or otherwise disturbed in wet condi6ons. Thetefore, we <br /> I <br /> ; recommend that earthwvrk be scheduled during the drier and wermer months of the yeaz <br /> when it is cheaper and more effective. If earthwork has w taioe placc in wet wrzther or wet <br /> ( condi6ons, the recommendations detailed below should be followed. <br /> I 1) Fill material should contain not more than 5 pencent fines, by weight, based <br /> upon wet sieving the soil fra�tion passing the 3/4-inch sieve. Fines should be <br /> non-plastic. The outwash may be suitable for this use. If enough outwash is <br /> Inot available, such soils would have to imported co the site. <br /> 2) As an altemadve, stabili7ation of on-site soils with cement or lime wvuld be <br /> I required to achieve proper wmpaction. Aeration may not be feasible during <br /> wet weather. <br /> I3) Construction tcaffic should be restricted to fr�quently used routes. The size or <br /> type of equipment may have to be limited to prevent soil disturbance. <br /> 4) Farthwork should be accomplished in small sections and carried thmugh to <br /> completion W minimize exposure to wet weather. No soil should be left <br /> � uncompacted so it can soak up watec Soils which become too wet for <br /> compaction should be remwed and replaced with clean granular macerial. <br /> 5) The ground surface in the construction area should be sloped and sealed with <br /> a smooth drum roller at the end of each day to pmmote the �apid runoff of <br /> precipitadon and w prevent ponding of wecer. <br /> 6) Gravel working surfaces arc recommended once the subgrade area for floor <br /> slabs and pavements az�e exposed. If foundations arie conswcted during <br /> wetter times of the year, or if seepage is significant, a thin layer of lean-miz <br /> concrete should be placed at the base of the footings to reduce the possibiliry <br /> of disturbing the subgrade soils. <br /> I7) In cut areas, it may be desirable to leave the subgrade on.. to t�w feet abwe <br /> the planned grade so that disturbed soils resulting from construcdon operdtions <br /> I W-6693-01 <br /> i 7.2 <br />