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<br /> � Page 5 - N320-10A15 ,� p;ti��
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<br /> Because of the slope of the site, tne fill area should be Denche6. While �:s
<br /> -' the site 9lacial till soils may be used for the comqacted till, these soils
<br /> must be compacted at ornear optimum moisture cantent. It censtruction is f
<br /> — =�
<br /> done 1n late fall or early spring, it may be Citficult to place these so11s w=
<br /> �r;
<br /> _ at the proper moisture content so that it may be necessary ta use a granular
<br /> � till. At least 6" of free-draining granular soil should be provided
<br /> "' immediately below the floor slab. ,�;
<br /> A portion of the lower level will be below the 9round surtace. T�e nasement '
<br /> , walls Sn this area will be subjected to lateral loads. Since the top af
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<br /> � � these walis will be restrained, the walls should De designed based dn an f� ti�' �
<br /> ,� r�,+�
<br /> f�7'�:
<br /> � nt-rest soil pressure. For the natural soils at this site, we recomnenC 'A
<br /> ' using a IC� of 0.15 and a weight for the soil of 130 pcf. A minimum of Z' of
<br /> h-
<br /> ,>
<br /> free-draining granular soil should be provided adjacent to the walls for
<br /> Qrainage. The upper 1' or so of fiil can be an impervious clay to �inimize
<br /> � . surface infiltrat�on. Although there is no evidence of ground water in t�e
<br /> -• borin9s� we suggest providing a perimeter draln tile system for that portion
<br /> `" of the lower floor buried bela+ grade.
<br /> ,y.
<br /> The pressure on the walls can be reduced by increasirtg the area of clean
<br /> ,,, granular backfill. By increasing the area of backfill to include an area
<br /> . beginning 1' out from the wall and upwards and outwards at an angle of 30°.
<br /> " the walis could be designed for an equivalent fluid weight of 45 pcf. Again
<br /> A a layer of clay can be provided at the surface to minimize surface
<br /> �
<br /> infiltration.
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