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i <br /> � . <br /> � GEOTECHNICAL ENGINEERING S'i'IJDY <br /> Told Development <br /> � May 8, 1990 E-4888 <br /> Page 4 <br /> , Site Prenaration <br /> , Areas to be developed should be stripped of all vegetation, building debris, or any other , ,,, <br /> substances deemed to be deleterious to the development of the sita It is estimated that the ' n <br /> topsoil stripping depth will be about six ro eight inches, tt is estimated that up to seven feet �' <br /> , of structural fill, inclusive of the dock-high fill, may be needed tu bdng the site to grade. � � i <br /> :�a <br /> The soils above the till were wet to satwated. Therefore, unless the moisture content can ' `� <br /> be reduced.. it may be necessary to use imported granular soil as structural �II. The moisture � '� <br /> � mr.tent can be reduced either by aeration in dry weather or by intermixing lime or cement �,�F� <br /> to absorb exce� moisture. <br /> � <br /> rThe deeper glacial soil may be wet at the contect with the upper soils. If wet weather � <br /> grading is planned, clean granula; fil] as described in Appendix C should be used. If � <br /> desired, the glacial till may be used as structural fill provided the gra�ing operations are ~ <br /> � conducted during dry weather. Tiil has a significant amount of fines; thus, compaction and ��� <br /> grading wi11 be difticult i[ the soil moisture increases much above the optimum moisture ' ' <br /> rnntent. Refer to Appendix C for general grading ;ecommendations, �.� <br /> � Foundatione I <'(. <br /> �,,. <br /> � Based on the encountered site conditions and the preliminary building design criteria, the e`?� <br /> foundations can be placed on the dense to very dense, gray silry sand with gravel about two �, <br /> to three feet bulow the sudace, or on structnral-fill. �r: <br /> � We recommend the fcllowing criteria be used in foundation design: � <br /> t� <br /> I • Allowable bearing pressure including all 2 500 sf <br /> dead and live loads, bearing on the native c � p ' � <br /> till or a atructural fill ' � �� <br /> I • Minimum depth of perimeter footing, below = 18 inches � ��� <br /> adjacent tinal exterior grade. <br /> I • Minimum depth of interior footing below = 12 inches <br /> top of floor slab. <br /> • Minimum width of wall footings <br /> = 16 inches , <br /> • Minimum lateral dimension of column footings = 24 inches � <br /> • Estimated post-construction settlement � <br /> 1 inch, or less <br /> Eerfh Coneultents, Inc. <br /> � � <br />