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AirTouch Cellulat <br />3 October 7997 <br />7-91 M-11905-0 <br />Page 6 <br />feasible foundation options for this site. Our specific recommendations concerning design <br />and construct�on of drilled piers and mat footings are presenied in the following <br />subsections. <br />4.3.1 Drilled Piers <br />For the purposes of des?pn, we have extrapolated geotechnical desi�n information beyond <br />the refusal depth in our boring (approximately 35 feet), based on our experience with <br />similar soils and our knowledge of soil conditions in the vicinity of ;he site. We <br />( recommend that AEE be present in the field during construction to confirm ttie extrapoiated <br />� soil conditions. The following comments and recommendations are provided for drilled pier <br />� design and construction purposes. <br />Desian Values: Table 1, below, summarizes the soil vaiues utilized in our geotech!iical <br />� engineering a�alysis for the soil layers encountered at this site. We derived these values <br />from our t:xplorations and fiald testing, as well as from lat�ratory testing performed on <br />similar materials and established correlations for soil properties. These values are <br />I presentAd for background information only; the use of these soil values in cursory or <br />� supplemental enalyses should be by icnowledgeable geotechnical engineers only and should <br />incorporate phys�r.al factors that may influence the allowable soil reaction for known <br />� loading conditions. <br />TABLE 1 <br />SUMMARY OF SOIL VALUES FOR DECIGN 6F DRILLED PIERS <br />Depfh li;-Place Internal Cohesion <br />�nterval Density Friction Angle (psf) <br />(feet) (pcf) (degrees) <br />0 to 5 125 30 0 <br />5 to 12Yz 132 32 0 <br />12'/: to 28 135 34 0 <br />28 to 40 138 36 0 <br />` Comoressive Caoacitv: We recommend that the drilled pier penetrate at least 10 feet <br />� below the ground surface. Tabie 2 presents our recommended allowable compressive <br />capaci:ies for drilled piers of varying diameter and depth. These values incorporate a <br />safety factor of 1.5 and include reductions for the dead weight of the pier; as such, they <br />( represent groundline compressive capacities. A linea! interpolation may be used between <br />� each depth interval to obtain the allowab!e capacity for that specific depth. <br />7•B1M-11806-0 <br />