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PN: 50663GE <br />November 20, 2006 <br />8.1 Fill Placement Recommendations <br />There are several references throughout this report regarding both natural soil and compacted <br />structural fill recommendations. The recommendations presented below aze appropriate for the <br />fill placement considerations discussed throughout the report above. <br />All areas to receive fill, structural components, or other site improvements should be properly <br />prepazed and grubbed at the initiation of the project construction. The grubbing operations <br />should include scarification and removal of organic material and soil. No fill material or <br />concrete should be placed in azeas where existing vegetation or fill material exist. <br />8.1.1 Embankment Fill on Slopes <br />Embankment fill placed on slopes must be placed in areas that have been properly prepazed <br />prior to placement of the fill material. The fill should be placed in a toe key and benches <br />constructed into the slope. The concept is shown below. <br />Pre-construction ground <br />surface New Embankment Fill <br />Benches <br />Toe Key <br />Bench Drain <br />Toe Key Drain <br />Toe Key and Bench Concept <br />No Scale <br />The width of the toe key should be at least one-fourth (1 /4) of the height of the fill. The <br />elevation difference between each bench, width, and geometry of each bench is not critical, <br />but generally the elevation difference between each lift should not exceed about three (3) to four <br />19 TRAUTN <br />A DIVISION OF TRIGONH~ <br />