Utility Structures. Bring backfill to grade in even lifts on all sides. Lift depths and compaction densities shall be as specified according to area of installation for pipe above. Backfill against cast-in-place concrete structure only after concrete has attained the specified 28-day compressive strength.
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Sources: Sanitary Sewer System Specifications, Sanitary Sewer System Pressure, Sanitary Sewer System Specifications