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Pile capacities for the concentric piles have been calculated utilizing the efective cylinder area of the <br /> PowerTeam C25C hydraulic cylinder used with the Stabil-Loc Foundation Piering Systems assembly. A <br /> charts howing the resulting capacities is attached to this letter. Per the attached document, a Stabil-Loc <br /> 2-7/8"diameter concentric pile installed to a minimum pressure of 5,000 psi results in a maximum <br /> allowable capacity of 17.2 kips including a safety factor of 2. <br /> The results are summarized below: <br /> Typical Helical Piles: <br /> Maximum Demand = 13.0 kips/pile <br /> Available Capacity= 17.2 kips/pile <br /> Typical Concentric Piles: <br /> Maximum Demand = 12.0 kips/pile <br /> Available Capacity= 17.2 kips/pile <br /> By inspection,the pile capacities of the installed piles exceed the maximum loading demand as <br /> determined by 1-120's analysis.Therefore,the installed piles comply with the structural design/demand. <br /> To align with jurisdiction requirements,the FOR from L120 Engineering and Design has provided an on- <br /> site re-inspection (May 17, 2024) where a single installed test pile (Helical Pile#3) was load tested to be in <br /> compliance with the min. required loading for the typical piles as specified in the calculations. During <br /> the re-inspection testing, it was observed that the test pile reached test pressures equivalent to a load <br /> capacity of 16 kips before the existing structure showed signs of lifting, at which point the testing was <br /> halted. As can be seen by the initial installation drive logs, pressures equivalent to 25.2kips (1800psi) were <br /> achieved for all pile locations.The limitation of the re-tested pile lies in the dead load of the structure <br /> only as the counterbalance force as it has already been installed. By inspection, it can be seen in both <br /> the initial installation results and the re-tested pile results that the pile capacity of the installed pile(s) <br /> exceeds the maximum loading demand as determined by 1-120's analysis.Therefore,the installed pile(s) <br /> comply with the structural design/demand. <br /> The results of re-inspection testing of installed pile(s) are summarized below: <br /> Pile#3 Maximum Demand = 13.0 kips/pile <br /> Pile#3 Available Capacity = 16.0 kips/pile <br /> Please contact us if you have any questions. <br /> Sincerely, . . . <br /> •' HU,QA'. <br /> Mans R.Thurfjell, P.E �S�r.Fna3.NSr. <br /> L120 Engineering& Design (1-120) <br /> mthurf0ell@1120engineering.com ' <br />