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ENGEO <br /> INCORPORATED <br /> <br /> <br />5150.100.101 <br />May 2, 2008 Page 14 <br />6.5 ACCEPTABLE FILL <br /> <br />On-site soil and rock material is suitable as fill material provided it is processed to remove <br />concentrations of organic material, debris, and particles greater than 8 inches in maximum <br />dimension. Fill material should meet the above requirements and have a plasticity index less <br />than 12. <br /> <br />6.6 FILL COMPACTION <br /> <br />6.6.1 Grading in Structural Areas <br /> <br />Perform subgrade compaction prior to fill placement, following cutting operations, and in areas <br />left at grade as follows. <br /> <br />1. Scarify to a depth of at least 8 inches; <br /> <br />2. Moisture condition soil to at least 1 percentage point above the optimum moisture content; <br />and <br /> <br />3. Compact the subgrade to at least 90 percent relative compaction. Compact the upper <br />6 inches of finish pavement subgrade to at least 95 percent relative compaction prior to <br />aggregate base placement. <br /> <br />After the subgrade soil has been compacted, place and compact acceptable fill (defined in <br />Section 4) as follows: <br /> <br />1. Spread fill in loose lifts that does not exceed 8 inches; <br /> <br />2. Moisture condition lifts to at least 1 percentage point above the optimum moisture content; <br />and <br /> <br />3. Compact fill to a minimum of 90 percent relative compaction; Compact the upper 6 inches of <br />fill in pavement areas to 95 percent relative compaction prior to aggregate base placement. <br />