Soil from Leaking Underground Storage Tank. Certified for gasoline by USEPA SW 846, 3rdedition, methods SW846 and 8015M. Certified valueBenzene 5.34 mg/Kg o-Xylene 5.5 mg/Kg Ethylbenzene 3.82 mg/Kg Xylene, total.20.1 mg/Kg Toluene . 17.8 mg/Kg Gasoline