Soils are classified as RCRA Hazardous if they have been directly impacted by a listed hazardous waste, or if they exhibit one or more of the following characteristics: ignitability (flash point), corrosivity (pH)
, reactivity (cyanide/sulfide), or toxicity (TCLP).
Fuel oil contaminated soil and other petroleum contaminated soil categories are typically classified as non-hazardous, since they rarely exceed the TCLP limits, and typically do not contain listed hazardous compounds.