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17 <br /> Variations in Subsurface Conditions <br /> Our interpretation of general subsurface conditions is based on the soil and <br /> groundwater conditions observed at the explored locations only. This information <br /> has been used as a basis for our preliminary interpretations. Conditions may <br /> vary at locations not investigated during our field investigation. At this site, <br /> a high degree of subsurface variability is expected to at least 15-ft depth. If <br /> variations of soil conditions become evident before or during construction, <br /> reevaluation of interpretations presented here may be necessary. <br /> FOUNDATION CONSIDERATIONS AND OPTION <br /> Introduction <br /> A proper foundation analysis and design must include estimates of vertical <br /> movement during the anticipated applied loading conditions and provide an ade- <br /> quate factor of safety with respect to shear failure. The structures, equipment, <br /> and tanks must be able to tolerate anticipated vertical soil deformations due to <br /> compression, swelling, or collapse. The foundation type and dimensions also must <br /> be designed to apply a net contact pressure well below the ultimate bearing <br /> capacity of the underlying foundation materials. Net bearing pressure is defined <br /> on Plate 37. <br /> As noted, significant deposits of broken glass and cullet are present on and <br /> beneath much of the proposed cogeneration site. Even where glass is not present, <br /> the in-situ materials may consist of uncontrolled fill. In addition to the <br /> environmental and potential hazardous waste considerations associated with this <br /> material (which were beyond scope of our review) , the presence of these materials <br /> has significant implications on founding and supporting cogeneration facility <br /> equipment and structures. <br /> Foundation Options <br /> Several approaches can be considered for supporting the cogeneration facili- <br /> ties' equipment and structures. These approaches include: <br /> 1. The cogeneration equipment and facilities can be supported on deep <br /> foundations which penetrate through the glass layer and are founded in <br /> underlying materials. <br /> 1144A/CC-17 :i Mcaelland <br />