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� <br /> i � <br /> � <br />�;.,. � <br /> F <br /> C I <br /> i. I <br />� <br />; � � � � � � � i <br /> i . <br /> HONG �QNSULTING ENGINEER,,, INC. ' '' <br /> • Geotechnical Englneering • fTlaterlol Testing • Constructlon Quolity Control Inspection • � <br /> OctoUcr 18, 1989 <br /> Crosby Homes <br /> � � � � uu � � �� <br /> 16000 Mill Crcck Blvd. <br /> M[u c���k, Nashington 98012 OC1' 1 9 1989 <br /> Attcntion: Mr. Chuck Crosby EVERETT BUILDING DEPT, <br /> SuUjcct: Rcsults of foundation inspcction and <br /> recommcndations for furthcr actions <br /> 520G 15[h Avcnuc P�., Evcrc[[, Nashington <br /> Our Projcct NuR,ber 8961 <br /> Dcar Mr. CrosUy: <br /> At }our rcqucst, on Octobcr 16, 1989, wc conductcd an inspcction of thc foundation cx- <br /> cavation bcaring soils at thc residcntial sitc listcd abovc. Our findings wr,rc as follows: <br /> 1) Thc Coundation cxcavation was sufficicn[ly dccp that no org:�nic soils or dcbris <br /> wcrc found bcncath thc footing IcvcL <br /> 2j The house footings were placcd on mcdium dense to dcnse, native, fine to mcdium <br /> sand, proUably of giacial outwash origin. <br /> 3) ALundant groundw�tcr was obscrvcd cn[cring thc cxcavation, and running water ' <br /> and Uoiling tivas tcnding to looscn thc Ucaring soil. <br /> 4) Thc foundations wcrc on two Icvcls, an upper onc to thc cast, and a lowcr to thc <br /> wcsr. proUlcros wcrc most scvcrc in the lowcr arca. <br /> 5) Sump oumps for rcmoving thc watcr appcarcd to Uc adcquatc in �apacity, thc sump <br /> scrcen; wcrc constantly Uccoming cloggcd: hcncc standing watcr collcctcd in thc <br /> northH est corncr of thc foundation cxcavation. <br /> 6) In thc upper arca, disturbcd soil was rcmovcd from thc footing form in:mcdiatcly <br /> in advancc of ,hc concretc pour, and thc footing was placcd on undisturbcd soil. <br /> 7) For approximatcly 50°iu of [hc lowcr portion of thc foundation, tliis samc tcchniquc <br /> was applicd. <br /> 8) In [hc nor[hwcs[ part of thc lowcr foundation portion, it w�s ncccssary to pour <br /> through muddy watcr. <br /> 9) A bcad of stiff concrctc was placcd along thc outsidc of thc forms ro prcvcnt loosc <br /> matcrial from sloughing into the foundation arca. <br /> 10) Loosc sand and organic dcbris was shovcicd out of thc footing arca, until firm <br /> sand remaincd Ucncath thc muddy watcr. Thc footings wcrc tcstcd with a probc <br /> bcfore being approved. <br /> 11) Concrctc was carcfully pourcd into thc foundation form in such a was as to dis- <br /> place thc muddy watcr latcrally, allowing dircct contact Ucrivccn thc footing and <br /> thc firm sand. <br /> In our opinion, tlic foundations h�vc bccn p:accd on mcdium dcnsc to dcnsc sand, and <br /> should cxpericncc acccptablc sct[Icrocn[. <br /> In our cxpericncc, thc main problcros associatcd wi[h [hc placcmcnt of foundations bclow <br /> thc watcr taUlc havc to do with mois[urc accumulation within thc crawl spacc bcncath thc <br /> 1'loor. To avoid such damagc, wc rccommcnd thc following s[cps: <br /> P.O. Box 596. Lynnwood. Washington 98046 • (206) 743-4774 <br />