2018 Indiana Design and Installation Manual 40 www.eljen.com
6.2 Above Grade Bed Design Installation Steps
15. Complete backfill with cover soil material to a minimum of 12 – 19 inches measured from the top of the 4-inch
distribution pipe. Fill must be clean, porous and able to sustain vegetation. Do not use wheeled equipment
over the system during backfill operation. A light track machine may be used with extreme caution, avoiding
crushing or shifting of pipe assembly.
16. Divert surface runoff from the system. Finish grade to prevent surface ponding. Topsoil and seed system area
to protect from erosion.
To Next Page