(a) Bedding material beneath a septic tank shall:
- (1) Consist of at least 4 inches of sand or crushed stone placed on a firm and uniform base;
- (2) Be level and compacted so as to prevent differential settling of the ground underneath the tank; and
- (3) Not bear on boulders or rock edges or any aggregate in excess of 3 inches in size.
(b) Backfill around a septic tank shall be:
- (1) Placed in lifts as specified by the tank manufacturer, but in no case greater than 12 inches; and
- (2) Compacted in a manner that does not damage the structural integrity of the tank.
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