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..Me,rila and Associates <br />STS Project 93492 <br />December 19, 1984 <br />WE <br />In other areas, or above the elevation of perched ground water, some of <br />the non -organic fill soils or other on -site soils should be suitable <br />for reuse as structural fill if the moisture content allows. If these <br />on -site soils are to be .sed for structural fill, the suitable silty <br />and sandy clays should be separated from organic topsoil, soft silty <br />clays and buried topsoil deposits during the excavation stage of this <br />development. These unsuitable soils should not be used as structural <br />fill for support of foundations, floor slabs, or pavements on this <br />site. Suitable on -site soils or imported fill materials should be <br />placed in loose lifts not to exceed 9 inches in thickness and should be <br />mechanically compacted to a minimum of 95% of the maximum Modified <br />Proctor dry density obtained in accordance with ASTM specification D <br />1557. If on -site or imported silty or clayey fill soils are to be <br />used, they should be limited to areas above the perched ground water <br />table and the moisture content of these soils should be controlled to <br />within + 2% of the optimum moisture content as determined by the <br />Modified Proctor test. The compacted fill materials should extend a <br />minimum of 1 ft horizontally outward from the edge of any footing, <br />utility or roadway for each vertical foot of fill placed beneath the <br />structure. <br />Foundation Design <br />Foundations placed on select, properly placed and compacted fill <br />material over a suitable subgrade, or on non -organic naturally - <br />occurring sandy or silty clay soil having an unconfined compressive <br />0- <br />