"Hazardous waste treatment" means the physical, chemical or biological processing of hazardous waste for the purpose of rendering these wastes for material resource recovery, amenable for storage, or reduced in volume, as regulated by chapter 173-303 WAC as now written or hereafter amended. (Added by Amended Ord. 02-064, Dec. 9, 2002, Eff date Feb. 1, 2003).