Cal. Health & Safety Code § 25244.2

For purposes of this article, “hazardous waste reduction, recycling, and treatment technologies” mean technologies and techniques which have, as their primary purpose, the reduced generation of hazardous waste, the recycling of hazardous waste, or the conversion of hazardous waste into a less hazardous form. “Hazardous waste reduction, recycling, and treatment technologies” do not include solidification or treatment occurring directly in, or on, the land, such as techniques using evaporation, surface impoundments, or land farming.