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July 3,2017 <br /> Single-Family Residence <br /> L&A Job No. 17-079 <br /> Page 12 <br /> material to be used as structural fill should be clean, free-draining, granular soils <br /> containing no more than 7.5 percent by weight finer than the No. 200 sieve based on the <br /> fraction of the material passing No. 4 sieve, and should have individual particles not <br /> larger than three inches. <br /> The ground over which structural fill is to be placed should be prepared in accordance <br /> with recommendations in the SITE PREPARATION AND GENERAL GRADING and <br /> EXCAVATION AND FILL SLOPES sections of this report. Structural fill placed on <br /> ground steeper than 20% should be structurally supported. Ground steeper than 15% <br /> should be bench-cut with vertical step no more than 3 fed before placing structural fill. , <br /> Structural -fill should be constructed in lifts no more than 10 inches thick in loose state, <br /> with each lift compacted to a minimum percentage of the maximum dry density <br /> determined by ASTM D1557(Modified Proctor Method) as follows: <br /> Application %of Maximum Dry Density <br /> Within building pads and under foundations. 95% <br /> Roadway/driveway subgrade 95%for top 3 feet and 90%below <br /> Retaining/foundation wall backfill 92% <br /> Utility trench backfill 95%for top 4 feet and 90%below <br /> In-situ density of structural fill should be tested with a nuclear densometer by a testing <br /> agency specialized in fill placement and construction work. Testing frequency should be <br /> one test per every 250 square feet per lift. <br /> LIU & ASSOCIATES, INC. <br />