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1 of 3 <br /> LONGITUDE <br /> ONE TWENTY <br /> ENGINEERING&DESIGN <br /> Driven Pile Review for Structural Compliance/Capacity <br /> Date: October 20, 2018 <br /> Project Name:2031 Rockefeller Ave SE-Stabilization Effort L120 Project#S180726-3 <br /> Project Location: 2031 Rockefeller Ave SE, Everett,WA 98201 <br /> Client's Name: Korey Yada, Production Coordinator—Permitting, Ram Jack West <br /> To Whom It May Concern: <br /> The purpose of this letter is to give structural input for the compliance of the final structural capacity of the <br /> installed product to meet or exceed the required maximum loading demand as determined by structural analysis. <br /> This letter is based on the driven pile installation log dated October 17,2018, provided to L120 by Ram Jack West <br /> for Ram Jack Job#018-352. <br /> With the grade-beams at a maximum span of 8'-0"on center at the exterior,the maximum required vertical <br /> capacity that L120 determined was 26 kips(ultimate)for driven piles.These demand requirements are as <br /> determined and specified in L120's structural calculation package issued on August 29,2018. <br /> Pile capacities for driven piles as provided by Ram Jack are attached to this letter. Per the attached documents,a <br /> 2-7/8"0 driven pile installed between 3ft and 5ft deep at a minimum pressure of 2,000psi results in an ultimate <br /> capacity of 32 kips. The results are summarized below: <br /> Helical: <br /> Maximum Demand(ultimate)=26.0 k <br /> Available Capacity(ultimate)=32.0 k <br /> By inspection,the pile capacity of the installed driven piles exceeds the maximum loading demand as determined <br /> by L120's analysis.Therefore,the installed piles comply with the structural design/demand. <br /> Please let me know if you have any questions. <br /> Sincerely, <br /> Mans R.Thurfjell, P.E <br /> L120 Engineering&Design(L120) <br /> 02) G <br /> 0 <br /> L.0 ENG.+C ERiNGS DEW:.l'.. <br />