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r . : <br />Pile capacities for the concentric piles have been calculated utilizing the effective cylinder area of the Power <br />Team C25C hydraulic cylinder used with the Stabil-Loc Foundation Piering Systems assembly. A chart <br />showing the resulting capacities is attached to this letter. Per the attached document, a Stabil-Loc 2-7/8" <br />diameter concentric pile installed to a minimum pressure of 8,600 psi results in a maximum allowable capacity <br />of 22.1 kips including a safety factor of 2. <br />The results are summarized below: <br />Helical Piles #1-#8: <br />Maximum Demand (allowable): 16.0 kips/pile <br />Available Capacity (allowable): 18.8 kips/pile <br />Concentric Piles #1-#2: <br />Maximum Demand (allowable): 22.0 kips/pile <br />Available Capacity (allowable): 22.1 kips/pile <br />By inspection, the pile capacities of the installed piles exceed the maximum loading demand as determined <br />by L120's analysis. Therefore, the installed piles comply with the structural design/demand. <br />Please contact us if you have any questions. <br />Sincerely, <br />ZT Yang, P.E. <br />L120 Engineering & Design (L120) <br />ztyangLa1120engineering. com <br />MAns R. Thurfjell, P.E. <br />L120 Engineering & Design (L120) <br />mthurfj ell@1120engineering.com <br />�. S�ONAL ��•' <br />