A gravity piping system sits within a designated pipe zone featuring a minimum of six inches of pea gravel bedding material below the invert and twelve inches minimum on each side, compacted to ninety percent relative compaction. Common backfill or material compacted to ninety percent relative compaction fills the zone above the pipe up to the subgrade. At the surface, adjacent paving requires a twelve inch typical depth or varies as required with a thirty-six inch minimum for fire lanes. Landscape areas match in kind.
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