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Section 2707. Backfilling.
Backfilling shall consist of placing suitable material in all spaces excavated and not occupied drainage or other underground structures, up to 3 " from the existing surface. Backfill material shall consist of fine, readily compressible soil or granular material, near optimum moisture content, and shall not contain large stone, frozen material, or any other objectionable material. The final 13" of fill under road surfaces, shoulders or sidewalks consist of graded gravel to the specification of the Commissioner of Public Works. All material shall be distributed in not more than 12" layers, and each layer compacted by approved compaction methods before another layer is placed. Water may be added only to improve mechanical
compaction. Puddling or jetting will not be allowed. All sheeting and bracing material must be removed as backfill operation is in progress.
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