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� a <br /> Su6surfan Esploration, Geologic Naza�d, and � <br /> ' Kcicring Xope Pluuc I! Prcfimincry Gratahrucal Engineenng R�port � <br /> Evcncr, Itiarhi.^e�on Derign Recnrrunenc+allons � <br /> �� �.�_� 1 <br /> f <br /> � earthu•or}: operations, s.;m� sloughing and raveling may occur, and cut slopes may have to be ? <br /> adjusted in the firld. In additiun, �VISHA/OSHA regulations should be fotlowed at all times. i <br /> , <br /> � <br /> � <br /> r/ I0.0 S'i RUCZ'URr1L FILL , <br /> � .�; :_.`erences tc strucmral fill in this report refer ro subgrade preparation, fill rype, and i <br /> plar.ement and compac[ion of materials as discussed in this section. If a percentage of <br /> 1 compaction is specifird under anocher section of this report, the value given in that section <br /> should be used. <br /> � Construcuon plans aze preliminary ac this stage and do not include site grading information or <br /> building finished tloor elevations. However, placement of structural fill may be necessary in <br /> order to achieve the desired site grades in some are.�s. After stripping, planned excavation and <br /> I any reqi:ired ove:excavation has been perfortneci to the satisfaction of the geotechnical ' <br /> eneineer, [he upper 12 inches of expnsed ground in building areas or areas to receive fill ' <br /> should be recompacted to 90 percent of die modified Proctor maximum density using A°Tb1:D <br /> � 1557 as [he standard. The glacial oucwash soils are currendy near optimum or slighdy dry of ' <br /> op�imum moisture content for compaction. During the drier summer months, these soils wil( <br /> require moisture conditioning. However, if the suberade contains too much moisture primarily <br /> � within the areas underlain by till, adequate recompaction may be di�cult or impossible to ! <br /> obtain and should probably not be attempted before allowing the subgrade to dry/drain ; <br /> Iadequately. � <br /> AEer recompaction of the exposed ground is tested and approved, structural fill may bc placed <br /> � t� sttair. c'esired grades. Strucmral fill is defined as non-organic soil, acceptable to the <br /> geotecttni::a� eagineer, placed in maximum 8-inch loose lifts wid� eacli lift being compacted t� <br /> 95 percen[ of the mociified Proctor maximum density using ASTM:D 1557 as the standard. ; <br /> � The on-si[e, inorganic glacial soils are suitable for use as structural fill provided th�y are ; <br /> screr,ned of all oversized marerial� (cobbles grearer than 6 inches in diameter) and can be <br /> main[ained at a moisture con[ent that wiIl aliow compaction to the specified minimum densiry. <br /> � The outwash soils are predominately granular and would be usable as structural fill over a � <br /> wider range of mois[ure contents as compared to less select, siltier soils such as till. The un- ! <br /> si[e till soils may only be suitable for use as stnictural fill during the drier months of the year ; <br /> 1 due to cheir high moisrsre sensitiviry and silt content. In the case of roadway and utiliry trench ; <br /> filling, the backfill should be placed and compacted in acecrclance with current local or counry <br /> ' cocies and standards. The top of the compacted fill should extend horizontally outwud a , <br /> minimum distance of 3 fect beyond the location of the perimeter footings or pavement edge <br /> before sloping down at :.n angle of 3H:1V. � <br /> � I <br /> The contractor should note that any proposed fill soils should be evaluated by AESI prior to j <br /> thcir use i❑ fills. This would require that we have a sample of the material 48 hours in � <br /> IFebrunry Il, 2001 ASSOCIATED FIRTNSCIENCE$ /NC. � <br /> sci�ne-ti•c��;,��:.rro�.�u�:ai�;�vKr�wr.w:r. Page 10 � <br /> � i/ <br /> � <br />