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• fill should be expected to settle somewhat. Settlement of partially saturated fills is <br />difficult to predict. Our experience indicates that settlement will be approximately 1!2 <br />to 3/4 percent of the fill height. The following minimum percentages of the maximum <br />dry density as determined by ASTM D1557 (modified Proctor) are recommended: <br />a) Below foundations .................... 95% <br />b) Below floor slabs .................... 90% <br />c) Below paved areas .................... 95% <br />d) General overlot fill ................... 95 <br />e) Retaining Walls .. . ............. 88% to 92% <br />• Suitability of On-Site Soil: The on-site clay soil may be used for fills, except as backfill around <br />the reclaim tunnel, provided a risk of movement because of its moisture sensitivity can be <br />assumed for any structures. Following our recommendations should minimize the risk of <br />movement using the site clays. We understand that inert soils are generally not available on the <br />site and would have to be imported. Lower plasticity, more granular soils, where located in <br />borrows, should be stockpiled for use in fills for critical floor slab areas or as subbase in <br />roadways~~opsoil in fill or borrow areas should be stripped and segregated so that the fill will <br />be free of deleterious materials. The on-site soil should be processed so that the fill does not <br />contain rock fragments larger than 6 inches, particulazly in the upper 3 feet of fill under <br />structures or roads. In lower fills, boulders up to 18 inches can be used, provided it can be <br />demonstrated that no voids result and boulders are generally not in contact with each other. <br />~• <br />16 <br />