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I <br /> e r-- <br /> III' <br /> r <br /> i <br /> o The levels of TPH-G, benzene, ethylbenzene, and <br /> xylenes have increased in MW-4 and MW-6 between <br /> October 1988 and July 1990. MW-4 is located onsite <br /> and upgradient of the existing product tank area, <br /> while 'MW-6 is located offsite and upgradient of the <br /> former Mobil site. <br /> I <br /> o Between the last two sampling events the levels of <br /> benzene, tolune, and ethylbenzene in the water <br /> samples have decreased in' MW-5, while TPH-G and <br /> total xylenes levels have increased. <br /> i <br /> o TPH-G and BTEX constituents which previously were <br /> nondetectable in MW-7 have been detected in the <br /> water samples from the last ,two sampling events. <br /> o Only low to nondetectable levels of TPH-G and BTEX <br /> constituents have been detected in the samples from <br /> P-1 and P-2. <br /> o There appears to be another source of petroleum <br /> hydrocarbon constituents in the ground water, most <br /> likely from an offsite source. <br /> i <br /> I <br /> i <br />