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ADaPT Eo�ineerinQ, Inc. <br />represcntativc from ADaPT' should be rctained to observe thc condition of footing subgrades before <br />concrcte is poured to verify that fhey have been adcquately prepared. <br />Footing Dimensions: We recommcnd that thc thickcned edgc of the slab be desi�ied as a spread footing <br />and be constructed to have a minimum width of 12 inches. For frost protection, the footings should <br />pcnctrate at least 18•inches below the lowest adjacent exterior grades. Footings roay also bc suprorted on <br />strucmral fill placed on prepared soil subgradc. The horizontallimits of the fill pae below the building or <br />cabinet foundation may be establishcd by extending a line outward from the base of thc thickened slab at <br />an angtc of 1 Eiorizontal: 1 Vcrtical (1H: 1 V) down to the upper surface of the besring horizon. <br />I3earing Pressurc: A maximum allowablc soil bcaring pressure of 1,500 pounds per-square-foot can be <br />used for static footing loads. This bearing pressure can be incrcased by one-lhird to accommodate <br />transicnt �vind or scismic loads. An allowablc base friction coefTicient of 032 and an allowable passivc <br />carth prcssure of 250 pounds per cubic foot (pe�, expressed as an equivalent tluid unit wcight, may be <br />used for that portion of the foundation embedded more than 1 foot below fnished extcrior subgrade <br />elevation. <br />Settlemenls: We estimatc that total post-construction settlemenu of properly designed Cootings bearing <br />on property prcparcd subgrades from static loads could approach 1-inch, with diffcrential scttlements <br />approaching one-hatf of the total. We anticipate the total scttlement induced by scismic activity could <br />approach 3 to 4-inches. If such sctticment cannot be tolerated, the equipment buiiding or caUinets may be <br />supportcd by low capacity pilir.gs or picrs. <br />Access DriveH�ay <br />An existing paved driveway off o1' Broadway can be used as a construction access driveway, thereforc <br />conslruction of a separate drivcway do not appcar to be necessary. <br />Tawer Drilled Pier Foundations <br />Dased upon the subsurface soil and groundwater condilions disclosed by our test boring, wc recommend <br />that tl�e tower be supported on a dtilled picr foundation. Thc following rccommendations and commcnts <br />are provided for purposcs of drilled picr design and construction: <br />Compressive Canacities: We recommend that the drilled picr penetrate at least IS-fect bclow the ground <br />surfacc at thc location of boring I3-1. Por vertical compressive soil Ucaring capacity, wc recommcnd <br />using the unit end Ucaring capacity presented in Tablc 1 below. Thc allowable end bcaring capacity, <br />prescntcd in TaUlc l, includes a safety factor of 1.5 or mo:c. <br />VoiccSlrcam \4lydcss A7ay I8, :CKK� <br />ADaPI' Pro�cct No. N'AOOd034 Ptgc 5 <br />