Backfill Material Selection
Where flowable fill is used, precaution must be taken to prevent flotation during installation. Table 1 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
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