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f . To extract the analytes of interest from the soil matrix, 50-q <br /> sub-samples of soil were combined with So kL ' <br /> of di <br /> solvent and enough water was added to wet +e Soil. The analytes <br /> were extracted into the solvent by shakin4 forl'one hour. The ` <br /> solvent was separated from the soil and water by centrifugation. <br /> Aromatic volatile organic ooneentrations "ro determined by <br /> cerparison to an external standard which contained all components <br /> listed in EPA Method 8020. Aliquots of the dichloromethane <br /> extracts were analysed on a Hewlett-Packard 5886 capillary gas <br /> chromatograph equipped with a 30 m x 0.25 mm, OI:25 um film <br /> k thickness, J Z H D81301 capillary column and a� Hewlett-Packard <br /> Model 5970 mass selective detector operating in' the selective ion ; <br /> monitoring made. This type Of detector was used instead of the ` <br /> photoionzation detector suggested in BPA xithod18020 baeiaus <br /> eum products present in the <br /> a <br /> other petrolsamplesmight have <br /> interfered with correct identification of the analytes specified <br /> in Method 8020, particularly the dichlorobenzene components. s <br /> Determination of diesel fuel levels in the!s <br /> Method 8015. Aliquots of the dichloromethans�eplxtraetses lvared EPA ! <br /> i as described above were analysed on a Hewlett-Packard 5880pared <br /> capillary gas chromatograph equipped with a 30 x 0.25 mm, 0.25 <br /> um film thickness, J i W DB 17 capillary columr►11and a flame ! <br /> ionization detector. The carbon number range of diesel in the ! <br /> samples was from Cli to C22. Reference diaeel fuel No. 2 was ; <br /> 1 obtained locally and used as an external standard to calibrate ' <br /> the gas chromatograph. The summation of the peiik area re <br /> from C14, C16 and C18 was used for calibratiion and calculation of E <br /> the diesel concentration in the sample. <br /> ' Soil from the 15' level from R-1, R-2 and R-3 and from the 301 <br /> level from R-1 were analyzed for the halogenated volatiles <br /> described in EPA Method 8010. In addition 'to the dichloromethane r <br /> extract, a separate sub-sample of each four soil samples was <br /> extracted in .toluene by the procedure described above to allow <br /> determination of all analytes listed in EPAMet-Nod 8010. The <br /> 8xtrc��ewere analyzed by high resolution gas chromat <br /> try. aPhY/mass <br /> a{ t <br /> � F l <br /> Re-all 1CM11nion <br /> i <br /> Results for all samples for aroaatic volatile o Mica and diesel <br /> are presented in Table 1. Diesel at levels ranging from 14000 to <br /> ` 61000 uq/q and xylenes at levels ranging from p '4 Lo 22 u were <br /> found in all samples from R-1. Benzene, toluenej� and ethyl <br /> benzene were detected in some samples from R-1 at levels ranging <br /> from 0.7 to 4.4 ug/q. No aromatic volatile:°organics were <br /> detected in any samples from R-2 or R-31 diesel was detected in <br /> only one sample from R-3 at a level of 30 u4/g. �Ko halogenated <br /> volatile compounds were detected in the samples analyzed. <br /> � i� i <br />