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-z- diameter of more than six (6) inches. This fill material shall be ob- tained from areas shown on the plans. On-site materials classifying as CL, CH, SC, and SM are acceptable. Other on-site materials and all off-site materials must be approved by the Soils Engineer prior to hauling and placement. Concrete, asphalt, organic matter and other deleterious materials will not be approved. Highly pervious materials should be placed in the outer zones of the embankment with more impervious soils used to construct the central por- tions of the embankment. 7. MOISTURE CONTENT The fill material shall be moisture treated to within 2± percent of optimum moisture content as determined from laboratory compaction tests. Sufficient laboratory compaction tests will be made to determine the optimum moisture content for the various additional soils encountered in the borrow area. The Contractor may be required to add the necessary moisture to the fill material in the excavation, if in the opinion of the Soils Engineer it is not possible to obtain uniform moisture content by adding water on • the fill surface. The Contractor may be required to rake or disk the fill to provide uniform moisture content of fill material. The application of water to the embankment materials shall be made with any type of watering equipment approved by the Soils Engineer, which will give the desired results. Water jets from the spreader shall not be directed at the embankment material with such force that the fill materials are washed out. Should too much water be added to any part of the embankment, such that the material is too wet to permit the securing of the desired compac- tion, the rolling and all work on that section of the embankment shall be delayed until the material has dried to the required moisture content. The Contractor will be permitted to rework such wet material in an approved manner to hasten its drying. 8. COMPACTION OF FILL AREAS The selected fill material shall be placed in mixed and evenly spread approximately horizontal layers. After each fill layer has been placed, it shall be uniformly compacted to not less than the specified percentage of maximum density. Clay soils shall be compacted to at least 95 percent of the maximum dry density as determined using ASTM D 698 (standard Proctor). At the option of the Soils Engineer, soils classifying as SM or SC may •