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Yy� <br /> ��� <br /> �.�t�: <br /> n��.i �1 <br /> ..� , <br /> � :w...� <br /> , � <br /> ��� 4 _ ,,�. ;� <br /> H <br /> �4 O <br /> ��� ,� <br /> ��� � <br /> Geo Engineer� <br /> ��� , ' <br /> will result i� considerable disturUance to exposed subgrade areas. It <br /> �` ` will probably be necessary to provide temporary haul roads consisting of � <br /> ,y��y� � quarry spalls, crushed rock or pit run sand and �ravel during wet weather ` <br /> t' i <br /> M � � construction. The wea[hered till soils also have a moderate erosion ; . ' <br /> q� r <br /> � i,y potential. Silt fences, hay bales and other measures should be used to ` <br /> � I�i control erosion and sediment transport during construction. The forest � <br /> y � <br /> !_p Go � duff acts as a protective layer to the surficial soil and should be <br /> ��R,� removed only where and when necessary. <br /> Those areas whiclt are stripped or excava[ed to design su6gr.ade <br /> iA <br /> elevations or are to receive structural fill should be proofrolled with , <br /> I1 <br /> heavy ruUUer—tired construction equipmen[. Any soft, loose or otherwise <br /> � � ' unsuitabl.e areas identified during proofrolling shoul.d be recompacted if <br /> � $ practical or, if too wet, should Ue rer�oved and replaced wi�h structural <br /> a fill. In areas to receive structural fill, we recommend the native i <br /> iF I <br /> subgrade Ue compacted to the same density criteria as recommended For i <br /> i <br /> tr-,�� ; y structural fill. We recomenend that proofrolling not be performed during � <br /> i <br /> py wet weather or when t}te exposed soils are saCurated. If site work needs � <br /> � <br /> � � to be done during wet weather, it may be necessary to excavate discurbed i <br /> i � <br /> �� �d <br /> or unsuitable material and to place a layer of sand and gravel wit ess � <br /> � . � than 5 percent fines �or quarry spalls) to provide a working surface. We <br /> ' ' ; recommend the proufrolling of the aubgrade be observed by a representative ! <br /> H! <br /> from our Lirm to assess the adequacy of [he subgrade conditions and to j <br /> 1 f <br /> identify areas needing remedial work. <br /> � �� ��� We expect that all of the soils encountered across the site will be <br /> I � ! le able to be removed with conventional excavating equipmenc. It may be <br /> � <br /> ,� gy necessary to rip Lhe glacial till in localized areas to facilitate <br /> r <br /> excavacion. CobUles and boulders may be encountered randomly within the <br /> � till. <br /> ��► " M <br /> "• StrucCural Pill: All fill in the Uuilding arcas and in areas to be i <br /> � ' paved sliould Ue placed as structural fill. Tlie fill shou].d Ue placed in � � <br /> L�� � <br /> horizontal lifts not exceeding 10 inches in loose tit:ckness; each lift <br /> � �- must be thorou�hly and uniformly compacCed. Pill placed within the �� <br /> � building fooCprinC, and extending do�anward wil'hin a 1: 1 plane from tlte ' <br /> finished floor elevation should be compacted to aC least 95 percent of the . <br /> p 6 <br /> � � �', <br /> � <br /> � „ . <br /> __, � - � <br /> .;•„- <br /> a <br /> , ,_ ,y. _ ,� �. • ,. v ;. � <br /> w . F. <br /> ,... .ti ,. , _ ., �,. �, <br /> ." �. .. � � n.. . . ' . � . . .. . ' . . ... �S� <br /> I <br />