Front and side views of a concrete pipe trench assembly adjacent to a foundation wall and footing. The trench includes a concrete fill section with tamped sand and compacted backfill above, maintaining specific minimum clearances around the pipe diameter. Key dimensions specify a minimum six inches of clearance around the pipe, eight inches minimum trench width at the base, and a minimum one foot six inches cover at the surface. A two-inch clearance is maintained between sleeves and pipes typically, and excavation is restricted below a designated line.
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