Soil quality. Risk-based petroleum hydrocarbons. Determination of aliphatic & aromatic fractions of semi-volatile petroleum hydrocarbons using gas chromatography with flame ionization detection (GC/FID) Soil testing, Soils, Mineral oils, Spectrophotometry, Infrared radiation, Gas chromatography, Interferences (chemical), Test equipment, Specimen preparation, Testing conditions, Mathematical calculations, Reports, Determination of content, Quantitative analysis, Chemical analysis & testing, Extraction methods of analysis