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Crushed gravel as backfill material

Backfill Material Selection. Acceptable Backfill Material and Compaction Requirements Soil Classification Minimum Maximum* Compaction Description ASTM D2321 ASTM D2487 Standard Density (%) Layer Height (in.) Flowable Fill n/a n/a Dumped ** Graded or crushed stone Crushed gravel Class I - Compacted 12 (0.3m) Well-graded sand, gravels, and gravel/sand mixtures; Poorly graded

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