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i <br /> LONGITUDE <br /> ONE TWENTY° <br /> ENGINEERING&DESIGN <br /> Helical Pile Review for Structural Compliance <br /> Date: May 17, 2024 <br /> Project Name: 5117 1271"Ave- Foundation Stabilization Effort L120 Project#S211026-4XR <br /> Project Location: 5117 127th Ave W, Everett, WA <br /> Client's Name: Alesha Stickles, Project Coordinator—R&R Foundation Specialist, LLC <br /> To Whom It May Concern: <br /> The purpose of this letter is to confirm pile installation and capacity compliance with the structural <br /> requirements specified in the L120 Structural Calculation Package and Structural Site Plan dated May <br /> 10th,2022. <br /> During the week of October 27th, 2022, eleven (11) helical and three (3) concentric piles were installed <br /> by R&R Foundation Specialists (R&R)to stabilize areas of the single-family residence located at 5117 <br /> 127th Ave W, Everett, WA 98203.To the knowledge of L120,these piles were installed by R&R certifed <br /> installers in accordance with the cited structural package, ESR-3750 and ESR-4121. Please refer to the <br /> attached drive log and photographs provided by R&R. <br /> The helical and concentric piles were installed with maximum pile spacing of 7'-0"on-center,the typical <br /> minimum required vertical capacity as determined by L120 is shown in the table below.These demand <br /> requirements are as determined and specified in L120's structural calculation package cited above. <br /> PILE SPACING&LOAD REOUIRMENTS TABLE <br /> MAX O.C,SPACING,ft MIN VERTICAL CAPACITY,kips PROOF TESTING LOAD,kips <br /> PILE N PILE TYPE 200%MIN VERTICAL CAPACITY LOCATION <br /> BTWN PILES END OFFSET ALLOWABLE LOADING <br /> (MIN ULTIMATE CAPACITY) <br /> Typal HELICAL T-0'LINO PER PLAN 13 0 kip 26 0 kip PER PLAN <br /> Typal DRIVEN PER PLAN PER PLAN 12 0 kip 24 0 kip PER PLAN <br /> Pile capacities for the helical piles have been calculated using a Digga HH-6K drive head with a torque <br /> correlation factor, Kt, of 9 as prescribed in ESR-3750. A chart showing the resulting capacities is attached <br /> to this letter. Per the attached document, an Ideal Foundation Systems 2-7/8" diameter helical pile <br /> installed to a minimum pressure of 1,800 psi results in a maximum allowable capacity of 17.2 kips <br /> including a safety factor of 2. <br /> 4. •6 9502 <br />