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24 <br /> Shallow Foundations Underlain by Glass <br /> The fifth option is to consider supporting some of the equipment on shallow <br /> foundations in a localized layer of compacted fill that is underlain by glass. <br /> We do not consider shallow foundations underlain by glass to be an appropriate <br /> foundation type for heavily loaded, large, or settlement sensitive equipment and <br /> structures. In some areas it may be possible to support light, settlement <br /> insensitive structures, such as small skid-mounted units, on shallow foundations <br /> underlain by the glass and glass by-products. <br /> Several unique considerations are associated with this option. Settlement <br /> in the glass and glass by-products may be highly variable and will likely have a <br /> collapse type movement (i.e. , relatively large sudden movements that occur above <br /> a certain threshold of pressure) . Estimating the settlement potential in the <br /> glass and glass by-products will be difficult at best. We do not believe that <br /> such settlements can be realistically estimated based on laboratory tests on <br /> small samples. Instead, we suggest that field load-deflection tests be conducted <br /> if this option is to be considered for anything other than settlement insensi- <br /> tive, very nominally loaded equipment such as isolated small skid-mounted equip- <br /> ment. <br /> Estimated Settlements <br /> Settlement analyses have been performed for a variety of foundation loads, <br /> assumed in situ soil properties, and thickness of improved soil. It is important <br /> to realize that settlement estimates in the variable and unique subsurface <br /> materials at this site are very difficult and _hence the results should be <br /> considered approximate. If the glass locally contains significant unfilled <br /> voids, the settlement in these areas could be significantly larger than the <br /> estimated settlement presented subsequently. Estimated settlements are tabulated <br /> on the following plates: <br /> Plate 42 - Due to Grade Raise <br /> Plate 43 - Beneath Individual Square Footings <br /> Plate 44 - Beneath Tanks <br /> Please note that the expected settlements beneath footings and tanks are <br /> additive to the expected settlements due to the grade raise. Estimated settle- <br /> ments beneath rectangular footings and pads can be approximated by assuming a <br /> square footing of equal area. <br /> 1144A/cc-24 :]'McClelland <br />