Civil · L-9NTWA

Utility Trench Under Existing Pavement

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An underground utility trench is excavated beneath existing pavement with a minimum width of twenty-one inches to allow for proper compaction of backfill to ninety-five percent aggregate base. A mainline or lateral line rests at the base inside a sleeve sized to twice the pipe diameter, accompanied by a conduit for control wires sized as needed. The trench is filled with compacted backfill to a minimum depth of eighteen inches below the pavement subgrade. Pavement surface and base are patched to match existing conditions, with sawcutting restricted to a last resort requiring owner approval.

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