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1 of 8 <br /> LONGITUDE <br /> ONE TWENTYO <br /> ENGINEERING&DESIGN <br /> Helical/Concentric Pile Re-Inspection Verification Review for Structural Compliance <br /> Date: July 9, 2024 <br /> Project Name: 4504 Terrace Dr. - Foundation Stabilization Effort L120 Project#S220527-3XR <br /> Project Location:4504 Terrace Dr, 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 pile installation and capacity compliance with the structural <br /> requirements specified in the L120 Structural Calculation Package and Structural Site Plan dated August <br /> 27th, 2022. <br /> On September 12, 2023,four(4) helical piles and ten (10) concentric piles were installed by R&R <br /> Foundation Specialists (R&R)to stabilize areas of the single-family residence located at 4504 Terrace <br /> Dr, Everett,WA 98203. Helical Piles were installed with a Digga 6K drive head with a maximum depth <br /> of 4ft. Concentric piles were installed with a Power Team C25C Hydraulic Cylinder drive head to a <br /> maximum depth of 5ft. Piles were installed by R&R certified installers in accordance with the cited <br /> structural package, ESR-3750, and ESR-4121. <br /> On June 21st, 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#1) 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 8.5kips 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 16.8kips were achieved for the helical pile#1 location during initial <br /> driving of piles. By inspection,the pile capacity of the installed pile exceeded the maximum loading <br /> demand of pile#1 and typical piles, as determined by L120's analysis and was only limited during the re- <br /> test by the deflection/lifting tolerance on the existing structure. Therefore, load test satisfies anticipated <br /> loading based on as built conditions and the installed pile(s) complies with the structural <br /> design/demand. <br /> 06)790• 02 <br /> LUOEngineering.com <br />