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� <br /> . ' ,�, ��� <br /> . �OTE --� <br /> CONSULTA S <br /> I:I:�ON.E 1111h511Nurlhup aYl.����1�•!I <br /> Bellevur,WA 9F11N15 <br /> �211ti)717-StiIR <br /> �2116)9�3-7959 <br /> Uctober 13, 1986 <br /> JN 86218 <br /> I Ryssel Homes Inc. <br /> 13029 Bothell Way <br /> � F.verett, WA 98284 <br /> � <br /> i <br /> Attanttone Ken Ryssel <br /> i <br /> Subject: GeotRchnical Engineecing Obsecvattons and Recommen- '. <br /> detions, Single Family Residence, a918 Chinook Dcive, i <br /> Mukllteo, Washington. <br /> Dear Mc. Aysael : <br /> On Octobet 16, 1986 we met w[th you at the 4918 Chinook Drtvo to <br /> observe aite conditiona and p[ovide �ecommendetiona fo[ <br /> foundation and dzain conatcuction. The site is on a hilleide <br /> end plana ate to constcuct e house with a deylight basement . <br /> At the time of ouc viait, the excavation was completed . The <br /> ezcavetton exposed fill eoilo overlytng ftne to med/um-q[ained, <br /> slightly sllty sando. Conefderable aeepage was encounte�ed in <br /> the garage area on the uphill eide of the foundatfon. Maximum <br /> flow was Yrom a cleaner eand layer in the southeast cotner of <br /> the excavation elope and from the bottom of the ercavation in <br /> the garage. Attached to thts lettec is our field �eport rhSch ! <br /> containe a sketch of the houae ezcavation showing seepaga I <br /> locatione. <br /> It ia ouc opinion that the eande will ptovide adequate support j <br /> fot foundations . Whece distucbed or where the sanda a[e I <br /> exceseively loose, we cecommend that the loose sa �da be removed <br /> and replaced with washed rock, crushed �ock, o� clean pit-cun <br /> gravel to provide a atable bearing surface. Foundations should <br /> be dealgned for an allowable beacing presauce of two thousend <br /> (2880) pounds per equere foot (pef) . Retaining wallc should be ' <br /> designed to teaist la[eral earth pceseu[ee equal [o that exe[ted � <br /> by a fluid having a unit weight of th[rty-flve (35) pounde pe[ , <br /> cubic foot . Sllding fo[ces can be resisted by friction along <br /> the base of the footing and slab and by passive eacth pressute. <br /> ' Foc design, a coefficient ot friction of 0. 40 and a passive <br /> - , �, earth pcessute equivalent flufd pressure value of thcee hundced <br /> � (360) pcf may be used. <br /> � <br /> � I <br /> � <br />