. "oard, bureau, division, service, office, officer, authority, administration, or other establishment in the executive branch of the government.Hazardous waste means those wastes designated as hazardous by Environmental Protection Agency regulations in 40 CFR part 261.Hydrogeologic unit means any soil or rock unit or zone which by virtue of its porosity or permeability, or lack thereof, has a distin" . . . . . .