Hazardous waste – “a solid waste, or combination of solid wastes, which because of its quantity, concentration, or physical, chemical, or infectious characteristics may (A) cause or significantly contribute to an increase in mortality or an increase in serious irreversible, or incapacitating reversible, illness; or (B) pose a substantial present or potential harm to human health or the environment when improperly treated, stored, transported, or disposed of, or otherwise managed. Id. ß 1004(4). Hazardous wastes may be classified as toxic, ignitable, corrosive or reactive.

Subtitle C – the section of federal law governing the generation, transportation, storage and disposal of hazardous wastes.

Use Constituting Disposal – the land disposal of hazardous waste in a product such as fertilizer, concrete or asphalt. Subject to Subtitle C jurisdiction up to the point it is land applied as a “product”.

Disposal – “the placing of any solid waste or hazardous waste into or on any land or water so that such solid waste or hazardous waste or any constituent thereof may enter the environment or be emitted into the air or discharged into any water, including ground waters”.

(TCLP) Toxic Characteristic Leaching Potential – A test conducted to predict the leachability of a hazardous waste from a lined landfill containing 95% municipal waste and 5% hazardous waste. For this reason during TCLP the waste is diluted 20:1 with an acid and the resulting waste extract tested for metals. (To convert TCLP to Total Metals, multiply TCLP by 20. This method is only an estimate since it assumes total solubility of the metal in acetic acid used during TCLP).

LDR (Land Disposal Restrictions) – A TCLP concentration level accepted as protective of human health and the environment when a hazardous waste is land disposed. Phase IV LDRs can be found in 40 CFR 268.40.