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1 of 7 <br /> LONGITUDE <br /> ONE TWENTY° <br /> ENGINEERING&DESIGN <br /> Pile Review for Structural Compliance <br /> Date: June 5, 2023 <br /> Project Name: 4332 Colby Ave- Foundation Stabilization Effort L120 Project#: S220906-1XR <br /> Project Location: 4332 Colby Ave, Everett, WA 98203 <br /> Client's Name: R&R Foundation Specialist, LLC <br /> To whom it may concern, <br /> The purpose of this letter is to confirm helical installation and capacity compliance with the structural <br /> requirements specified in the L120 Structural Calculation Package and Structural Site&Foundation Plan dated <br /> November 13,2022. <br /> On April 18,2023,thirteen (13) helical piles were installed by R&R Foundation Specialists(R&R)to lift the <br /> residence for 4332 Colby Ave, Everett,WA 98203. Helical Piles were installed with a DIGGA 10K drive head to a <br /> maximum depth of 13ft.To the knowledge of L120,these piles were installed by R&R-certified installers in <br /> accordance with the cited structural package, ESR-3750. Please refer to the attached drive log provided by R&R. <br /> With pile spacing at a maximum of 6'-0"on-center at the exterior,the minimum required vertical capacity as <br /> determined by L120 was an allowable loading of 10 kips per pile.These demand requirements are as determined <br /> and specified in L120's structural calculation package cited above. <br /> As required by the referenced structural package, proof testing was to be performed to 200 percent of the <br /> specified design load. It is L120's understanding that the installers utilized the dead weight of the existing structure <br /> to achieve the required reaction of a test pile. <br /> Pile capacities for Ideal Manufacturing, Inc. helical piles have been calculated utilizing the torque correlation <br /> factors provided in ESR-3750.A toque/capacity chart detailing this calculation has been attached to this letter. Per <br /> the attached document,an Ideal Foundation Systems 2-7/8 in diameter helical pile installed to a minimum <br /> pressure of 1,450psi results in an installation torque of 5,046 ft-lbs and an allowable capacity of 22.7 kips including <br /> a safety factor of 2. <br /> The results are summarized below: <br /> Helical Piles: <br /> Maximum Demand (allowable)= 10.0 kips/pile <br /> Available Capacity(allowable) =22.7 kips/pile <br /> •. ••• • <br /> • - . <br />