(a) Backfill for a well constructed by excavation shall be:
- (1) Placed in a manner that will deter intrusion of soil into the well and reduce the likelihood of surface waters percolating directly into the well through the backfill;
- (2) Covered with at least 2 feet of impervious material, including but not limited to, clay or hardpan; and
- (3) Compacted to reduce settlement.
- (b) Organic material including but not limited to loam, peat, building paper, hay or soil shall not be used as or in backfill.
- (c) When crushed stone is used around the casing, a non-polluting barrier, such as pea stone, shall be used over the crushed stone to prevent fine soils from entering the crushed stone.
- (d) The ground surface at the well shall be raised and graded to drain away from the well taking into consideration future settlement of the backfill and shall have a minimum slope of 2 inches per foot.
Source. (See Revision Note at chapter heading for We 600) #12083 eff 3-1-17