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Geotechnical Engineering Report 7 January 7,2020 <br /> QFC 852 Fuel Station,Everett, Washington RGI Project No.2019-258A <br /> becomes more difficult or impossible to achieve. Soils containing more than about 5 <br /> percent fines cannot be consistently compacted to a dense, non-yielding condition when <br /> the moisture content is more than 2 percent above or below optimum. Optimum <br /> moisture content is the moisture that results in the greatest compacted dry density with a <br /> specified compactive effort. <br /> The native soils are moisture sensitive and may require moisture condition prior to use as <br /> structural fill. The sandy native soil may be suitable for use as structural fill if the moisture <br /> can be properly controlled at the time of compaction if the construction occurs in dry <br /> weather. If the construction occurs in winter or extended to wet season, it may be <br /> necessary to import clean, granular soils to complete site work that meets the grading <br /> requirements listed in Table 2. <br /> Table 2 Structural Fill Gradation <br /> U.S. Sieve Size Percent Passing <br /> 4 inches 100 <br /> 3/ inch 70 minimum <br /> No. 4 35 to 60 <br /> No. 200 0 to 5* <br /> *Based on minus 3/4 inch fraction. <br /> Prior to use, a RGI representative should observe and test all materials imported to the <br /> site for use as structural fill. Structural fill materials should be placed in uniform loose <br /> layers not exceeding 12 inches and compacted as specified in Table 3. The soil's maximum <br /> density and optimum moisture should be determined by ASTM D1557. <br /> 1 <br /> I- <br /> RILEYGROUP <br />