- (a) Before backfilling the EDA, the stone shall be covered with a durable permeable layer that will allow ventilation, such as a 2 inch layer of hay or filter fabric. An impervious covering such as tar paper or plastic shall not be used, as this interferes with ventilation.
- (b) Backfill material shall be clean, permeable fill.
(c) After backfilling, the top of the EDA shall be covered with:
- (1) Four to 6 inches of loam suitable for seeding and stabilized with seed or mulch; or
- (2) Other permanent stabilization techniques.
- (d) No more than 18 inches total of backfill and loam shall be used to cover the EDA unless the effluent conduits are vented.
- (e) Hydraulic backfilling or machine tamping of the backfill or loam, or both, shall be prohibited.
Source. (See Revision Notes #1 and #2 at chapter heading for Env-Wq 1000) #11184, eff 10-1-16; ss by #14486, eff 2-1-26, EXPIRES: 2-1-36 (formerly Env-Wq 1016.05)