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18 <br /> *ANW `./ — <br /> 2. The glass, glass by-products, and uncontrolled fill can be excavated <br /> and replaced with engineered fill with the equipment and structures <br /> then founded in the fill. <br /> 3. The glass, glass by-products, and uncontrolled fill can be improved in <br /> place with dynamic deep compaction (DDC) and some or all of the equip- <br /> ment and facilities then can be founded on shallow foundations. <br /> 4. The glass, glass by-products, and uncontrolled fill can be partially <br /> overexcavated and recompacted and cogeneration facilities and equipment <br /> can be supported on a mat of compacted fill that is locally underlain <br /> by the glass and glass by-products. <br /> 5. The existing glass, glass by-products, and uncontrolled fill can be <br /> left in place and the structures and equipment can be founded on <br /> shallow footings, provided that the structures and equipment impose a <br /> very low bearing pressure and can accommodate significant total and <br /> differential settlement. <br /> The above approaches are presented in descending order with respect to the <br /> degree of confidence in the adequacy of the resulting project. We do not con- <br /> sider placement of equipment or structures on unimproved existing soils (approach <br /> 5) to be adequate for most components of this project. <br /> Considerations with respect to each of these options are briefly described <br /> in the following paragraphs. Selection of appropriate foundation options will <br /> depend on: a) flexibility in the layout of cogeneration facility equipment, b) <br /> foundation loads and tolerable settlements, and c) the degree of risk that can be <br /> accepted relative to unacceptable foundation performance. Thus you may wish to <br /> consider using a combination of the above approaches. <br /> Deep Foundation Option <br /> Pile Type and Penetration. Pile foundations are a viable option at the <br /> site. We recommend displacement piles driven to bearing in the sands encountered <br /> at about ±35-ft penetration. Drilled foundations are likely to be undesirable <br /> because of the difficulty that may be encountered when drilling through the <br /> glass. <br /> Axial Pile Capacity. The ultimate axial capacity, Qu, in compression for a <br /> given pile size and tip elevation can be determined: <br /> Qu q s <br /> a + gpap <br /> 1144A/Cc-18 11 McClelland <br />