A tightline collector pipe is centered within a trench measuring one foot wide with a minimum two-inch clearance below the invert and a variable eight-inch minimum height. The trench is lined with a geotextile fabric, such as TenCate Mirafi RS380i or an approved equal, featuring minimum twelve-inch overlaps and secure staples in place. Native backfill is compacted to ninety-five percent within the trench, topped with mound backfill and compacted subgrade as specified. The synthetic turf section is installed above the subgrade elevation, with the finish grade established at the top of the infill.
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