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After each layer has been evenly spread, moisture conditioned, and mixed, it should be <br />uniformly compacted to a minimum of 90 percent of the maximum density as determined <br />by ASTM test designation D-1557, or as otherwise recommended by the soil engineer. <br />Compaction equipment should be adequately sized and should be specifically designed <br />for soil compaction or of proven reliability to efficiently achieve the specified degree of <br />compaction. <br />Where tests indicate that the density of any layer of fill, or portion thereof, is below the <br />required relative compaction, or improper moisture is in evidence, the particular layer or <br />portion shall be re-worked until the required density and/or moisture content has been <br />attained. No additional fill shall be placed in an area until the last placed lift of fill has <br />been tested and found to meet the density and moisture requirements, and is approved <br />by the soil engineer. <br />In general, per the UBC/CBC, fill slopes should be designed and constructed at a gradient <br />of 2:1 (h:v), or flatter. Compaction of slopes should be accomplished by over-building a <br />minimum of 3 feet horizontally, and subsequently trimming back to the design slope <br />configuration. Testing shall be performed as the fill is elevated to evaluate compaction as <br />the fill core is being developed. Special efforts may be necessary to attain the specified <br />compaction in the fill slope zone. Final slope shaping should be performed by trimming <br />and removing loose materials with appropriate equipment. A final determination of fill <br />slope compaction should be based on observation and/or testing of the finished slope <br />face. Where compacted fill slopes are designed steeper than 2:1 (h:v), prior approval from <br />the governing agency, specific material types, a higher minimum relative compaction, <br />special reinforcement, and special grading procedures will be recommended. <br />If an alternative to over-building and cutting back the compacted fill slopes is selected, <br />then special effort should be' made to achieve the required compaction in the outer 10 feet <br />of each lift of fill by undertaking the following: <br />1. An extra piece of equipment consisting of a heavy, short-shanked sheepsfoot <br />should be used to roll (horizontal) parallel to the slopes continuously as fill is <br />placed. The sheepsfoot roller should also be used to roll perpendicular to the <br />slopes, and extend out over the slope to provide adequate compaction to the face <br />of the slope. <br />2. Loose fill should not be spilled out over the face of the slope as each lift is <br />compacted. Any loose fill spilled over a previously completed slope face should be <br />trimmed off or be subject to re-rolling. <br />3. Field compaction tests will be made in the outer (horizontal) 12 to 18 feet of the <br />slope at appropriate vertical intervals, subsequent to compaction operations. <br />4. After completion of the slope, the slope face should be shaped with a small tractor <br />and then re-rolled with a sheepsfoot to achieve compaction to near the slope face. <br />Subsequent to testing to evaluate compaction, the slopes should be grid-rolled to <br />Pacific Development Group <br />File:\se,ver\andree\4900\497681 .foundshopctr <br />Appendix F <br />Page 5