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29 <br /> This equation is for a vertical load applied at the center of the footing <br /> and includes a factor of safety in excess of 2.5. A 33 percent increase in <br /> allowable bearing pressure can be used for seismic design. <br /> Sliding. Sliding resistance can be computed based on the values of passive <br /> pressure and base friction provided in the discussion for the turbine and boiler <br /> foundations. <br /> Settlement. Estimated settlements for various combinations of footing <br /> sizes, applied net pressure, and subsurface conditions are provided on Plate 43. <br /> Note these values are approximate and are additive to values of settlement due to <br /> the planned grade raise at the site. Settlement considerations were discussed <br /> more completely in the previous Foundation Considerations of this report. <br /> Tank Foundations <br /> Locations and Sizes. A number of cylindrical, steel-shell storage tanks <br /> with maximum heights of 24 ft are planned for the facility. Some of the larger <br /> tanks include: <br /> Applied Static Pressures <br /> Purpose Diameter (ft) Height (ft) Gross* (psf) Structural** (plf) <br /> Treated Water 43.5 24 1,800 2,950 <br /> IDR Product 16.0 20 1,650 2,240 <br /> *When full of product. <br /> **Applied to ringwall by steel shell. <br /> Foundation Options. Several of the foundation options discussed previously, <br /> are potentially suitable for the proposed tanks. Optimization would require <br /> additional shallow (to 15-ft depth) site specific subsurface data at each tank <br /> locations. In lieu of additional field exploration, we recommend that the areas <br /> beneath the major tanks be improved with DDC or by excavating and replacing the <br /> existing materials to at least 8-ft depth. <br /> Allowable Bearing Pressure. Based on the anticipated properties of improved <br /> soil or compacted structural fill and the standard bearing capacity equations, <br /> 1144A/CC-29 \McClelland <br />