Standard Laying Conditions
ANSI/AWWA C150/A21.50
ANSI/AWWA C151/A21.51
1 “Flat-bottom” is defined as undisturbed earth.
2 “Loose soil” or “select material” is defined as native soil excavated from the trench, free of rocks, foreign material and frozen earth.
3 Granular materials are defined per the AASHTO Soil Classification System (ASTMD3282) or the Unified Soil Classification System (ASTM D2487), with the exception that gravel bedding/backfill adjacent to the pipe is limited to 2" maximum particle size per ANSI/AWWA C600.