“Fill extension” means the area of horizontal fill around a bed in a raised system or a system on a slope. The term does not include side slopes.

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 1002.27)