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iI J I <br /> 1 <br /> � <br /> � <br /> J <br /> Settlement <br /> � Portions of the mnnel mat thet are constructed on the glacinl till ero expected to undergo <br /> negligible settlements. Portions of the tunnel construcred on fitl soiis mey undergo settlements <br /> �:, on the order of 1/4 to 3/8 inch. <br /> f t� I <br /> Eerth Pressures <br />:� The wells of the tunnel should be designed to resist lateral earth pressures which ere <br /> intensified due to the 2,000 psf floor slab loading. We recommend thet lateral pressures be <br /> f � calculated using the expression 660+40H(in psC),where H is the depth below the slab elevation. <br /> Excavation Sunoort <br /> � I� <br /> Fp, We rocommend that the I6 foot deep temporary excavation required to prepare the tunnel <br /> foundetion be made with side siopes not exceeding 1.25 horizontal to 1.0 vertical. The edge of <br /> I ;*- the excavetion should be no cioser than 4 feet Crom the well of the existing Building 40-56 <br /> i �`.`.I <br />, � p, because of the heavy fioor loads et some locations neer the north well of that building. <br /> R <br />, ' <br /> j� '' We thenk you for the opportunity ro be of service on this project. Please contect us iC <br />� queations erise regerding the contents of the report or if further sssistence is required. <br /> t <br /> Respectfully submitted, <br />!� �� ` DAMES & MOORE <br />�i� �, �pN�;`�y �'/ <br /> Q �d�'�°M� � <br /> i � " R,, �„ 9� Harba s L. Chebra, PE <br />�Q �!' _ �' � g D Associece <br /> �; <br /> I ,. �� �"ors�rc�° G/. YM. `McC�A►� <br /> I i ti�h'��i W. Martin McCebe, P.E. <br /> • Project Manager <br /> � <br /> ("� Merch 13, 1989 <br /> L <br /> � � <br /> ' , � <br /> _ , <br />.;; <br /> ; <br /> , � <br /> _ 7 <br />� Dames& Moore � <br />