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1 of 7 <br />LONGITUDE <br />ONE TWENTYO <br />ENGINEERING & DESIGN <br />Helical/Concentric Pile Re -Inspection Verification Review for Structural Compliance <br />Date: May 28, 2024 <br />Project Name: 4230 Grand Ave - Foundation Stabilization Effort L120 Project # S220802-1XR <br />Project Location: 4230 Grand Ave, 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 <br />September 13t", 2022. <br />On March 08, 2023, seven (7) helical piles were installed by R&R Foundation Specialists (R&R) to <br />stabilize and lift areas of the single-family residence located at 4230 Grand Ave, Everett, WA 98203. <br />Helical Piles were installed with a Digga 10k drive head with a maximum depth of 18ft, by R&R certified <br />installers in accordance with the cited structural package and ESR-3750. <br />On May 24th, 2024, to align with jurisdiction requirements, the FOR from L120 Engineering and Design <br />provided an on -site re -inspection where a single installed test pile (Helical Pile #2) was load tested to be <br />in compliance with the minimum required loading for the typical piles as specified in the structural <br />calculations. During the re -inspection testing, it was observed that the test pile reached test pressures <br />equivalent to a load capacity of 12kips before the existing structure showed signs of lifting, at which <br />point the testing was halted. As can be seen by the initial installation drive logs (attached for reference), <br />pressures equivalent to a minimum 15.7kips were achieved for all helical pile locations during initial <br />driving of piles. By inspection, it can be seen in both the initial installation results and the re -tested pile <br />results that the pile capacity of the installed pile(s) matches and/or exceeds the maximum loading <br />demand as determined by L120's analysis. Therefore, the installed pile(s) complies with the structural <br />design/demand. <br />