Lead contaminated soil is defined by the EPA as RCRA hazardous when TCLP-Lead is detected in concentrations greater than or equal to 5 mg/L, in which case the soil would carry a D008 RCRA waste code. Lead contaminated soils containing TCLP-Lead at concentrations less than 5 mg/L are classified as non-hazardous if they contain no other Underlying Hazardous Constituents.