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Laboratory Procedures <br /> Analysis for total petroleum hydrocarbons calculated as gasoline (TPH-g), TPH calcu- <br /> lated as diesel (TPH-d), and TPH calculated as oil (TPH-o) will be performed by the <br /> DHS LUFT method. Analysis for benzene, toluene, ethylbenzene, and xylenes will be <br /> performed by modified EPA Method 8020. These analytical methods utilize gas chro- <br /> matography and flame- or photo-ionization detection. <br /> Analysis for total oil and grease will be by the gravimetric method (EPA Methods 5520 <br /> B and F). This analysis is also performed by gas chromatography and flame- or photo- <br /> ionization detection. <br /> Analysis for volatile organics will be by EPA Method 624/8240. Analysis for semi- <br /> volatile organics will be by EPA Method 627/8270. These analytical methods utilize <br /> gas chromatography and mass-spectrometry. <br /> Analyses for metals will be by California Assessment Manual techniques. The samples <br /> will be extracted by chemical wet-lab techniques which vary by metal analyte. Detec- <br /> .tion will be by atomic absorption, mass-, flame-, or photo-spectrometry depending on <br /> the metal analyte. <br /> All analyses will be performed by California State-certified analytical laboratories. <br /> 3100011B/WKPLN A- 2 August 8, 1994 . <br />