An irrigation trench detail shows a lower PVC irrigation main or submain bedded in four inches minimum of native soil bedding, surrounded by native soil backfill that is water jetted and compacted to ninety percent optimum density with a forty-eight-hour settlement period. An upper PVC irrigation lateral sits at a minimum depth of twelve inches below finished grade within native soil backfill compacted to ninety-five percent compaction. The entire trench requires a minimum total cover depth of twenty-four inches, with a width that may vary based on site conditions excavated into existing soil.
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