A twelve-inch high-density polyethylene manifold connects to a forty-eight-inch concrete manhole with a twenty-inch minimum invert. The isolator row is covered with ADS 601T non-woven geotextile and set over two layers of ADS 315WTK woven geotextile. An inspection port extends upward through the backfill to grade. Three-inch PVC weep holes are spaced at twenty inches on center each way in the base.
INVERT PER PLAN ISOLATOR ROW 12" HDPE MANIFOLD COVER ISOLATOR ROW WITH ADS 601T NON-WOVEN GEOTEXTILE TWO LAYERS ADS 315WTK WOVEN GEOTEXTILE INSPECTION PORT 48" CONCRETE MANHOLE 3" PVC WEEP HOLES, TYP 20" O.C. EACH WAY. 24" MIN
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