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Mr. Joe Green <br />Project NO. EAIX-91-411 <br />Report No. 09-121-2123 <br />December 26, 1991 <br />Page 4 <br /> <br />On the basis of our studies at this site, we draw the <br />following principal conclusions: <br /> <br />1. Excavations for structures will encounter loose <br />fills of local silts and clays of alluvial or~gin. <br /> <br />2 The upper unit of loose fill material, although <br />undoubtedly consolidated under its present conditions of <br />loading, will undergo an additional cycle of <br />consolidation and settlement upon. the application of <br />further loading; consequently, the fill Should not be <br />used in its present state for the support of structures. <br /> <br />3. Cast-iu-P!ace Piers <br /> <br />Foundation units ~grade beam pads) caf be supported on <br />piers placed on the underlying native soil unit, using <br />bearing pressures of 2,000 psf. cast-in-place shelless <br />concrete piles may also be used, when drilled to a <br />minimum depth of 3 feet into'the native bearing horizon <br />and to a depth so that a line projected from the base of <br />the foundation to the toe of the slope is no steeper <br />than a 2 horizontal to 1 vertical. <br /> <br />underlno circumstances should additional fills be <br />placed anywhere on the slope. Surplus material <br />must be removed to a remote disposal area. The <br />existing over~ank fills have settled and are.' <br />anticipated to remain'stable provided erosion <br />control measures are instigated. <br /> <br />5. Foundation P'reparation <br /> <br />Inasmuch as the native soil units which will prpvide <br />support'for the structure are extremely sensitive to <br />disturbance in the presence of excess moisture, care <br /> <br /> <br />