Plumbing · P-9BZKE

Trench Backfill Detail

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Standard trench backfill requirements apply to both undeveloped and paved areas. The pipe rests on a sand bedding layer extending three inches below and six inches above the pipe, compacted to ninety-five percent relative compaction in maximum eight-inch lifts. In undeveloped areas, twelve inches of native backfill are placed below the topsoil, which consists of a twelve-inch layer of lawn, gravel, earth, or oiled earth. In paved areas, the trench receives two inches of asphalt concrete cold mix over six inches of Class 2 aggregate base compacted to ninety-five percent, with wheel cutting and patching to match existing road conditions. The remaining trench depth uses native backfill compacted to ninety percent in undeveloped areas and ninety-five percent in paved areas.

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