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... Zn�nng PrnpertP 9J-12-10 <br /> Ereret�, N'nslrin,qiorr <br /> above. Only light hand operated compaction devices should be used within 5.0 feet <br /> of the back of the proposed rockery. <br /> We recommend that a Testing Lab be hired to perform a representative number of <br /> in-place density tests on the fill. <br /> The suitability of soil for structural fill use depends primarily on the gradation and <br /> moisture in the soil when it is placed. As the amount of fines (that portion passing <br /> the U.S. No. 200 sieve) increases, soil becomes increasingly sensitive to small <br /> changes in moisture content and adequate compaction becomes more difficult or <br /> impossible to achieve. Soil containing more than about 5 percent fines by weight, <br /> cannot be consistently compacted to a firm, dense, non-yielding condition if tlie <br /> moisture is more than a few percent above the optimum moisture content. Structural <br /> fill should consist of a predominantly free draining granular soil, free of organics and <br /> other deleterious material, witli a maximu►n individual particle size no greater than 4 <br /> inches in maximwn dimension. Structural fill should contain no more than � percent <br /> by �veight passing the No. 200 sieve, when measured on the minus No. 4 sieve <br /> fraction. A soil of this gradation may be successfully compacted under a �vider <br /> ran�e of weather conditions. <br /> Tlie sandy soils found on this site can be used for structural fill if tliey are in a dry <br /> to damp condition. If the moisture content of these soils is above optimum, they <br /> will be difficult to compact and will tend to pump as they are worked. If imported <br /> structural fill is required, it should meet the requirements for Gravel Borro�v spelled <br /> � � GES, lnc. <br />