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diameter shall not be used. Imported fill soil should have a expansion index no greater <br />than 25. <br />7) Fill soils shall be placed in lifts not exceeding 6 inches, brought to within plus or minus <br />two percent of optimum moisture content and compacted to not less than the density <br />specified below. <br />S) Fill slopes shall be constructed at intervals not exceeding 4 feet vertically. Placement of <br />fill shall -not continue until the slope face, at a depth of 6 inches, measured perpendicular <br />to the slope face, has been tested and found to be compacted to at least the density <br />specified below. <br />9) All fill and backfill shall be compacted to at least 90 percent of the laboratory dry density <br />as determined by the ASTM D1557 test procedure, except as noted in the geotechnical <br />report. <br />10) Areas to receive backfill shall be cleared of trash, debris, and loose, soft, or disturbed <br />soils. Prior to placement of backfill, the areas shall be observed and approved by the <br />Project Soils Engineer. <br />11) Backfill shall be compacted by mechanical means to the density specified above. The <br />contractor shall select equipment and techniques to accomplish compaction of the backfill <br />to the specified density such that backfilling operations will not result in movement or <br />damage to completed work. <br />12) Observation and compaction tests shall be performed by the Project Soils Engineer at the <br />time of fill and backfill placement to verify that the specified percentage of moisture <br />content and the required degree of compaction have been obtained. Where the <br />requirements or specifications are not met, additional effort shall be made with <br />appropriate adjustment of the compaction energy or moisture content as necessary until <br />the requirements and the specifications are met. <br />13) Wherever, in the opinion of the Soils Engineer or Owner's Representatives, an unstable <br />condition is being created, either by cutting or filling, the work shall not proceed in that <br />area until an investigation has been made and the grading recommendations revised, if <br />necessary. <br />IN 40007.095-01 <br />ft1t�-06j-1ah n-_doc <br />2of2 <br />