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�� <br /> �---- - . : n <br /> RZAAGRA Inc. ,.�"' `°` -^`:," ,"�'��Y <br /> i s��n�� ,eo <br /> _'�,, n... _ .. �, , : • . :.: ._ . . > r;�,�.�anc t�;4��,o3a s91P. <br /> �?i;u� S<G.»6o9 <br /> FAX •^OG� 821-391G <br /> 27 May 19�! W-8210-2 <br /> Group Health Cooperatfon <br /> 521 Wall Street <br /> Seatde, Washk�pton 98121 <br /> Atterrtbn: Mr. Joe Neuenschwander, A.I.A <br /> Subject: Supplementary Bearinp Pressure Irdomietlon <br /> Group Health Everett pin� <br /> Hewltt Avenue and Maple Street <br /> Everett, Washinpton <br /> GenUert�en: <br /> As requeeted by Mr. Joe Neuenschwander, thie letter presents supplemerrtary InfomiaUon repardinp <br /> allowaWe beerkp preasures relative to desipn d faortinps ior the above reterenced medk:al dlNc. We <br /> previously perfortned a peotechnical Irnestipatlon for the proJect and submitted the results fn our report of <br /> June 1992. In au report, we recwnmended tf�at e meximum ellowaWe bearinp pressu►e d 4,000 psf be <br /> used for deripn o(footkips supported on weathered placlal dll or serid/sAty sand. A hipher bearinp preasure <br /> d 8,000 psf was ellowed for desipn oi footinps supported upo� very dense, wiweathered plac�el til. <br /> However, beted upon the depth ta urnveathered placial ril In our test borinps and the pianned Nnished 11oor <br /> elevations, k oripinally eppeared thet only the footinps in the touthem thUd d the dinic would eMend krto <br /> the very dense, unweathered placial tNl soYs. Now that the site has been excavated dovm very near <br /> proposed subprade elevation, we have observed that the urnveathered placial tGi so9s are exposed quRe <br /> extensNely ecxoss the slte. <br /> We are of the opinfon that footinps which were oripinally deslpned with a 4,000 psf maximum allwvade <br /> bearinp pressure may be redesip�ed with an 8,000 psf maximum allowade bearinp pressure provided that <br /> the footirp wYl bear e�tirely upon very dense unweathered placial tAl. On the basis oi the curtent excavation <br /> cut,we heve delineated the Iimlts of where urnveathered placial tpl sops are exposed which are appropriate <br /> for the 8,000 psf beariny value. A site plan showinp this information was tumished to ABAM Structural <br /> Engineers, and is also induded with thls letter fa your reference. <br /> G^ AGFA <br /> Earth&Envrronmental Group <br />