Laserfiche WebLink
1 of 7 <br /> LONGITUDE <br /> ONE TWENTYO <br /> ENGINEERING&DESIGN <br /> Helical Pile Review for Structural Compliance <br /> Date: April 30, 2024 <br /> Project Name: 1711 England Ave- Foundation Stabilization Effort L120 Project#:S231120-2XR <br /> Project Location: 1711 England Ave, Everett, WA 98203 <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 helical pile installation and capacity compliance with the structural <br /> requirements specified in the L120 Structural Calculation Package and Structural Site&Foundation Plan dated <br /> December 19,2023. <br /> On April 25-29, 2024,thirteen (13) helical piles were installed by R&R Foundation Specialists(R&R)to lift and <br /> stabilize the residence located at 1711 England Ave, Everett,WA.The Engineer of Record (EOR)from L120 <br /> Engineering and Design was present on site during the pile installation of these(13) piles.The piles were installed <br /> with a DIGGA 6k drive head to a maximum of depth of 12 ft. To the knowledge of L120,these piles were installed <br /> by R&R certified installers in accordance with the cited structural package and ESR-3750. Please refer to the <br /> attached drive log provided by R&R. <br /> With pile spacing at a maximum of 6'-0"on-center typical,the minimum required vertical capacity as determined <br /> by L120 was an allowable loading of 10 kips per pile.These demand requirements are as determined and specified <br /> 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. <br /> Pile capacities for helical piles have been calculated utilizing the torque correlation factors provided in ESR-3750.A <br /> toque/capacity chart detailing this calculation has been attached to this letter. Per the attached document, an <br /> Ideal Foundation Systems 2-7/8in diameter helical pile installed to a minimum pressure of 1,000psi results in an <br /> installation torque of 3,108 ft-lbs and an allowable capacity of 14 kips including a safety factor of 2. <br /> The results are summarized below: <br /> Maximum Demand (allowable)= 10 kips/pile <br /> Available Capacity(allowable) = 14 kips/pile <br /> 4. •6)790 9502 <br />