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—f <br /> BROWN AND CALDWELL LABORATORIES <br /> ' 1255 POWELL STREET EMERYVILLE,CA 94600•(415)428 2" <br /> March 10, 1988 <br /> Dr. Akali Igbene <br /> Levine Fricke <br /> 1900 Powelll Street, 12th Floor <br /> Emeryville, California 94608 <br /> ' Dear Akali: <br /> As you requested, here is a summary of Brown and Caldwell <br /> ' Laboratories method for the analysis of fuel hydrocarbons by <br /> gas chromatography with flame ionization detection. <br /> The extraction of soil samples is accomplished by a solvent <br /> extraction of a slurry mixture of 10 grams of soil sample and <br /> 10 mL of deionized water. A 10 mL portion of pentane is <br /> mixed with the soil slurry mixture and extracted for two <br /> ' minutes. A portion of the solvent phase is then injected <br /> into the gas chromatograph for analysis. The extracts are <br /> refrigerated until analysis. The method is applicable for <br /> analysis of low and high boiling point hydrocarbons because <br /> no concentration of sample is needed. <br /> A gas chromatographic method was developed for the <br /> simultaneous quantitation of gasoline, diesel fuel, motor <br /> oil and other commercial products. The method is based on <br /> EPA Method 8015 and can be described as a capillary gas <br /> chromatographic method using flame ionization detection. The <br /> analysis separates commercial fuel products on a DB-5 <br /> capillary column. The conditions and column description are <br /> ' included in Attachment I. <br /> The instrument is calibrated at the beginning of each run <br /> with standards of gasoline, diesel fuel and a mixture of <br /> ' benzene, toluene and xylene. Each standard is run at two <br /> levels at 10 x and 100 x the detection limit. All samples <br /> are quantitated by the standard which matches the <br /> chromatographic pattern most closely. Other products such as <br /> motor oil, stoddard solvent and paint thinner can be <br /> calculated from this method only after standards of these <br /> products are run. <br /> i <br /> a <br />