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1i <br /> � <br /> .�: , <br /> , . <br /> ���.� <br /> - t X %�. . �, <br /> , ;. ', „' ; <br /> �� : _ � <br /> � <br /> .,a,.. �{_: <br /> � � <br /> y � � � <br /> b� CC <br /> C y I � . <br /> y � � � WG-1049-01-067 <br /> y LOIIS CorporaUon Page 7 <br /> �°a y ro July 18, 1991 <br /> � � � '' g,2�, Basement ReWining Wall Drainage <br /> n :° � Suitable drainage measures should also be provided to prevent buildup of hydrostadc pmssures <br /> � �; � behind basement retaining walls, if lhe underground par}ang ]evel option is considered. These <br /> y y should include the following: <br /> � ° �' • A filter zone that consists of at least eightcen inches of clean, free-draining <br /> � � � material behind the wall, conforming to WDOT Standazd SpecificaGons, Secuon <br /> � y 9-03.12(2). ' d :� <br /> • A twelve-inch thick impervious soil cap at the top of the wall to inhibit surface � ,'' <br /> water infiltration. � <br /> • A perforated drainline located at the base of and behind the wall. '� � <br /> � <br /> p ;ypical wall subdrain detail is provided un Figure 5. <br /> g, Construction During Net-WeAthcr Conditions <br /> � �s� If construction proceeds during or shortly after wet-weather conditions, the moismre content o` <br /> �_, the on-site soils may be appreciably above optimum. Consequently, subgrade p�eparation, <br /> i placement and/or reworking of on-site soil as structural fill may not be possible. Altemauve <br /> � � wet-weather construction recommendations csn be provided by the geo:echnical engineer in the <br /> �� field at the timc of construction, if appropriate. <br /> C. Foundation Support <br /> '�� � ' <br /> I �.� 1. Spread Footing <br /> � We recommend that the building be supported on convenponal conunuous and isolated spread <br /> I �1�� footings bearing on either the dense native soils or on compacted fill as described in Sections <br /> g-2 and B-6, Overexcavation and Compaction. The exterior walls should be underlain by a <br /> continuous spread footing providing total enclosure of ihe perimeter of the building. "�,. , " <br /> � 1.__�ir <br /> ��� • ', The conventional footings can be designed on the basis of the following criteria: -,.��g <br /> �;:� r� i <br /> i `?,, <br /> ' � s Allowable bearing pressure on compacted structaral fill or _ 2 � PSf ���'� <br /> recompacted native soil, including all dead and live loads. ;S,I � <br /> �� ' ^ • Allowable bearing pressure on native dense soil, including ��' � <br /> .�� <br /> all dead and live loads. (This assumes that the foundaaon <br /> , is embecided at least six fcet bclow existing grade on the = 5 �psf - - <br /> dense nadve grey siity sand) <br /> rt <br /> � Kal�}veer Assoclates <br />