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i I disced, harrowed, or otherwise manipulated after the water is added. If the material is 2 too wet, the moisture content shall be reduced as necessary by spreading and 3 aerating. The layers of the fill material shall not exceed 6 inches and each layer shall 4 be compacted with suitable compaction equipment to provide the specified dry 5 densities. 6 7 2. The dry density of the compacted fill shall exceed 95 percent of the maximum dry 6 density. Field density tests shall be used to check the compaction of the fill materials. 9 Sufficient tests shall be made on each layer by the Engineer to assure adequate 10 compaction throughout the entire area. If the dry densities are not satisfactory, the 11 contractor will be required to increase the weight of the roller or the number of passes i 12 as required to produce the specified densities. 13 14 3. Where trenches must be excavated in Engineered Fill these trenches shall be backfilled 15 with the fill materials excavated. The backfill shall be placed in 6 inch layers and each 16 layer compacted with pneumatic tampers to provide densities as specified above. 17 Backfill placed adjacent to walls shall be placed in a similar manner to that specified 16 for backfill in excavated trenches. , 19 20 4. No fill shall be placed during weather conditions which will alter the moisture content 21 of the fill materials sufficiently to make adequate compaction impossible. After placing i 22 operations have been stopped because of adverse weather conditions, no additional 23 fill material shall be placed until the last layer compacted has been checked and found 24 to be compacted to the specified densities. 25 26 3.04 BACKFILL AGAINST STRUCTURES 27 26 Material for filling and backfilling around structures shall be free from sod, large lumps, 29 boulders, or rocks, roots, brush or other objectionable material, and shall be obtained from 30 required excavations insofar as practicable. Should the material available from excavation 31 be insufficient or unsuitable for the required use, the Contractor shall furnish and place 32 suitable material. Do not place backfill against newly constructed concrete structures for 33 a period of 14 days unless authorized by the Engineer. Backfill shall be placed as 34 engineered fill. Hand-held compactors shall be used for backfill against concrete walls. 35 36 37 36 END OF SECTION r STRUCTURE EXCAVATION AND BACKFILL ososs4 02225-