"Used oil sludge" means residues, such as tank bottoms, that separate from used oil due to gravity or other processing.
N.H. Admin. Code § Env-Hw 104.78
(See Revision Note at chapter heading for Env-Hw 100) #9360, eff 1-28-09; renumbered by #10204 (from Env-Hw 104.77 )