ARCHIVED REPORTS_XR0012636 CASE 1

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% ' � x, ticti Resultrecent ats, indaethe as well as results ofprevioussamplingeven following: �► The levels of TPH-G and BTEX constituents in MW-1 have remained nondetectable. e gree-floating product has been continually observed in MW-3 with approximately 0.01 foot measured on July 7, 1990. MW-5, which is only 8 feet east of MW-3, had no free product. ® The levels of TPH-G, benzene, ethylbenzene, and xylenes have increased in mw-4 and Mw-6 between October 1988 and July 1990- Mw-4 is located onsite and upgradient of the existing product tank area, while mW-6 is located offsite and upgradient of the former Mobil site. Between the last two sampling events, the levels of benzene, toluene, and ethylbenzene in the water samples from MW-5 have decreased, while TPH-G and total xylenes levels have increased. TPH-G and BTEX constituents which previously were not detected in MW-7 have been detected in the water samples from the last two sampling events. . ® Only low to nondetectable levels of TPH-G and BTEX - constituents have been detected in the samples from i AMw-1 through AMW-4. The sample from the offsite well, MW-6, which is adjacent to the Exxon Service Station and - crossgradient of the former Mobil site, had the 9 highest concentrations of both TPH-G and benzene, at 14,000 ppb and 590 ppb respectively. MW-4, which is -6 has TPH-G and benzene crossgradient from MW concentrations of 3,100 ppb and 510 pph., respectively. e Monitoring Well MW-8, which is adjacent to the Chevron service station and directly downgradient of MW-6, has TPH-G and benzene concentrations of - 11,000 ppb and 27 ppb, respectively. 7.3 riri atic- The aquifer analysis and calculations were based on the assumption that the porous media is isotropic and homogeneous. These conditions, however, seldom exist in the 15 s