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<br /> K y � ' LOJIS Corpontion WG-1049-Pa-063
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<br /> ,°r H �°, 7uly 18, 1991
<br /> N N
<br /> m � �` ' C. Groundwater '
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<br /> Hd1 R Groundwater was not encountered at the time of drilling in any of the exploratory borings. All
<br /> � borings were backfilled immediately after drilling. It should be noted that the borings may nut
<br /> � y � have been �F� ��ations rt thefig oundwate lev 1 could occurl duee�to'changesg nUnseasonsr • � ,
<br /> ,. a conditions.
<br /> � � r variations in rainfall, and oQier factors.
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<br /> � � � ' � t'nNCLUSiON5 AiY� RECOMMENDATIONS
<br /> �.
<br /> �
<br /> A. Gencral
<br /> IC is our opinion that Ihe site is suitabie for the proposed development (rom a geotechnical
<br /> i :
<br /> engineering standpoint provided that the loosc soil is overexcavated and replaced with compacted �� �
<br /> sWctural fi1L The conclusions and recommendations presented in this report should be
<br /> incorporated in the design and construction of the project to avoid any possible soil and/or �
<br /> foundation-related problems.
<br /> �' ' I
<br /> � We mcommend tha[ our firm review the final design, and specific�tions ro check that the - �- - _
<br /> � �� earthwork and toundation recommendations presented in this report have bcen properly
<br /> interpreted and implemented in the design and specifications. We can assume no responsibiliry ,
<br /> , for misinterpretation of our recommendations if we do r,ot review the plans and specifications. {�
<br /> �
<br /> � `�� � ; II.i_
<br /> �'� B. Eurlhwork
<br /> ._ .;�t„
<br /> ..�., � 1. Clenring and Sile Preparation
<br /> , � � � �,
<br /> The building azea should be stripped and cleared of all obstructions including sur;ace�:egetation,
<br /> � " organic matter, existing concretc slab, pavement, and any other deleterious material including
<br /> � '�� � � the oil-contaminated soiL Holes resulting from the removal of underground obstructions
<br /> extending below the proposed tinish grade should be cleared and backfilled with suitable material
<br /> compacted to the requirements given below under Item 8.4, Compaction". We recommend that =:-',.a.,,y':. '�,t
<br /> ` , .., : ;
<br /> e ' backfilling operations for any excavations to remove deleterious materiai be carried out mtder i
<br /> �,I r the observation of the gcotechnical engineer. ' �`T;�,, �;�' f�
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<br /> ! � � 2, Ovcrexcavation ` � :u`''
<br /> t 1�� ti Since the surticial soils are variable in their density, strength and compressibility, we
<br /> ' mcommer,d to overexcavate to a depth of up to six fcet below existing grades to provide -
<br /> adequate support for the foundation, as shown schematically in Figure 3. If soft or unstable ' �.
<br /> azeas aze encountered below six fcet, they shouid be overexcavated to a depth that will provide I':' �^6''�� "
<br /> a stable base. These soft zones will rypically be encountered in the azeas where the underground u• _�'r � 'I
<br /> storage tanks were removed. g
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