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July 21; 2d 14 <br /> Tvvo Single-Family residences <br /> L&A Job No. 14-065 <br /> Page 12 <br /> than 5 percent by weight finer than the No. 200 sieve based on the fraction of the material <br /> passing No. 4 sieve, and should have individual particles not 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 SIT� PREPARA"I'ION AND GENERI�L GRADING and <br /> �XCAVATION AND FILL SLOPES sections of this report. Structural fill should be <br /> placed in lifts no more than 10 inches thick in its loose state, with each lift compacted to a <br /> minimum percentage of the maximum dry density determined by ASTM D1557 <br /> (Modified Proctor Method) as follows: <br /> Application % of M�imum Dry Densitv <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 /> RETAINING WALL <br /> The hillside in the southeast quadrant of the project site may be stabilized with a retaining <br /> wall constructed along the toe of the hillside. Seepage out of the hillside may cause <br /> erosion and slide. Therefore, toe cut and construction of retainin� wail should proceed <br /> and be completed in the driest time between May 1 and October 31. Retaining wall may <br /> consist of a cast-in-place, reinforced concrete wall or a soldier pile wall. <br /> LIU & ASSOCIATES, INC. <br />