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LEIGHTON CONSULTING, INC. <br />General Earthwork and Grading Spedfications <br />4.2 Fill Moisture Conditioning <br />Fill soils shall be watered, dried back, blended, and/or mixed, as necessary to <br />attain a relatively uniform moisture content at or slightly over optimum. <br />Maximum density and optimum soil moisture content tests shall be performed in <br />accordance with the American Society of Testing and Materials (ASTM Test <br />Method D 1557-91). <br />4.3 Compaction of Fill <br />After each layer has been moisture-conditioned, mixed, and evenly spread, it shall <br />be uniformly compacted to not less than 90 percent of maximum dry density <br />(ASTM Test Method DI 557-91). Compaction equipment shall be adequately <br />sized and be either specifically designed for soil compaction or of proven <br />reliability to efficiently achieve the specified level of compaction with uniformity. <br />4.4 Compaction of Fill Slopes <br />In addition to normal compaction procedures specified above, compaction of <br />slopes shall be accomplished by backrolling of slopes with sheepsfoot rollers at <br />increments of 3 to 4 feet in fill elevation, or by other methods producing <br />satisfactory results acceptable to the Geotechnical Consultant. Upon completion <br />of grading, relative compaction of the fill, out to the slope face, shall be at least <br />90 percent of maximum density per ASTM Test Method D 1 557-91. <br />4.5 Compaction Testing <br />Field-tests for moisture content and relative compaction of the fill soils shall be <br />performed by the Geotechnical Consultant. Location and frequency of tests shall <br />be at the Consultant's discretion based on field conditions encountered. <br />Compaction test locations will not necessarily be selected on a random basis. Test <br />locations shall be selected to verify adequacy of compaction levels in areas that <br />are judged to be prone to inadequate compaction (such as close to slope faces and <br />at the fill/bedrock benches). <br />4.6 Frequency of Compaction Testing <br />Tests shall be taken at intervals not exceeding 2 feet in vertical rise and/or <br />1,000 cubic yards of compacted fill soils embankment. In addition, as a guideline, <br />at least one test shall be taken on slope faces for each 5,000 square feet of slope <br />face and/or each 10 feet of vertical height of slope. The Contractor shall assure <br />that fill construction is such that the testing schedule can be accomplished by the <br />Geotechnical Consultant. The Contractor shall stop or slow down the earthwork <br />construction if these minimum standards are not met. <br />F-5 <br />SL Rvcd 2019.01.21