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Guide Earthwork Specifications Page 4 PLACING AND COMPACTING OF FILL MATERIAL Engineered Fill shall be placed in layers which when compacted shall not exceed six inches (6") in thickness. Each layer shall be spread evenly and shall be thoroughly mixed during spreading to promote uniformity of the material in each layer. When the moisture content of the Engineered Fill is below optimum,water shall be added until a uniform optimum moisture content is achieved. When the moisture content of the Engineered Fill is too high to permit the specked compaction, the fill shall be aerated by blading or other methods until a satisfactory moisture content is achieved. Engineered Fill shall be compacted by mechanical means to produce a minimum degree of compaction of ninety percent (90%). Building pad fills placed at depth of more than three feet (3') below final building pad level should be compacted to at least ninety-five percent (95%). Compaction shall be undertaken with equipment capable of achieving the specified density. Each layer shall be compacted over its entire area until the desired densityhas been obtained. Field density tests shall be made by the Soil Engineer in accordance with ASTM Test Designations D2922-96 and D3017-96 (Nuclear Probe Method). Where compaction equipment has disturbed the surface to a depth of several inches, density tests shall be taken in the compacted material below the disturbed surface. Additional layers of the fill shall not be spread until the field density tests indicate the specified densities haw been obtained. FINAL SUBGRADE PREPARATION The upper eight inches of all final building pad and pavement subgrades shall be compacted to a minimum degree of compaction of ninety percent(90%),regardless of whether final subgrade elevation is attained by filling, excavation, or is left at existing grade. I TESTING Observation and testing by the Soil Engineer shall be provided during all filling, compacting and treatment operations. The grading contractor shall give at least twenty-four(24) hours notice prior to beginning such operations to allow proper scheduling of the work I'. II i I i 1