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..i <br /> r <br /> — .� 4 M3EM5OLT5 <br /> Low levels of toluene, moderate levels of ethylbenzene, and high levels of <br /> xylene were detected by 18 of the OV^Ma installed at the Shell station. <br /> The highest levels of �Iydrocsrbcnz were detecr.d. behind the station and in - <br /> the vicinity of the removed waste oil tank. Interpreted isolines for <br /> toluene, - ethylberaene, and xylene are shown on Plates 3, 4, and 5, <br /> F�1 respectively. A !minor smount of benzene was detected by OVM 02. This 04TH <br /> _. was installed at a depth of 1.5 feet and also collected more xylene and <br /> toluene than any of the other 0L74z. 047-! 4Z is located approximately 7 <br /> feet east of the removed waste oil. tank. <br /> The two "deep" OVMs, (OVM 04 and 4 13), installed at a depth of 3 feet <br /> �rlk below the ground surface, detected higher levels of ethylbenzene and <br /> xylene than the neighboring "shallow" (1.5 feet deep) OVMs. This <br /> indicates that hydrocarbon concentrations in the soil gas appear to <br /> °3 <br /> increase with depth in these locations. <br /> Minor amounts of halogenated volatile organic compounds were also detected <br /> by 18 of the OVMS. These oenpotttda are commonly found in solvents. The <br /> asoma cosnrsN.y detected Inalogenn*.ed comnpeund(s) was tetrachloroethane (FCA) <br /> and/or 1.1,2,2 "a rrachloroethar,r. These two compounds co-elute in this <br /> pS analysis and cannot be distfnsisbed without additional wort. <br /> vS Additionally, 1,1,1,-Trichloroethane (TCA) was detected by OVM 015 and <br /> possibly also by OM 914 (TCA, 'CA and 1.1,2,2-Tetrachloroethane could not <br /> be individually distinguished :n the analysis of MTM ;T,4.) <br /> 1+ The three duplicate OV^Ss ahowe,2 excellent repeatability and the field <br /> blank and two method blanks ("e, not detect any volat-11a organic composeula, <br /> which is indicatir of go quality control in .he data. <br /> N 70-87-979 <br />