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California Department of Transportation P p ion September 6, 2001 Stockton Maintenance Station, Stockton, California Project No 400296001 ' and MTBE concentrations increased from non-detectable levels to 254 µg/1 and 99 gg/l, respec- tively ' In well M - W 3, benzene concentration decreased from 4 9 µg/1 to non-detectable levels Total xylenes concentration increased from non-detectable levels to 10 µg/1 ' In well MW-4, total xylenes concentration increased from non-detectable levels to 1 0 µg/1 In well MW-5, total xylenes concentration increased from non-detectable levels to 1 0 µg/1 In well MW-6, concentration of TPH-G increased from non-detectable levels to 190 µg/1 Ben- zene, toluene, ethylbenzene and total xylenes concentrations all increased from non-detectable levels to 19 0 µg/1, 7 0 µg/l, 3 0 µg/1, and 24 0 µg/1, respectively In well MW-8, concentration of TPH-G increased from non-detectable levels to 670 µg/1 Ben- zene, toluene, ethylbenzene and total xylenes concentrations all increased from non-detectable levels to 186 jig/I, 30 µg/1, 18 µg/I, and 75 pg/l, respectively MTBE concentrations increased from non-detectable levels to 1 6 µg/1 In well VW-1, concentration of TPH-G decreased from 8,300 gg/I to 200 µg/1 Benzene concen- tration decreased from 1,070 µg/1 to 8 0 gg/I Toluene and ethylbenzene concentrations decreased from 204 µg/1 and 425 µg/I to 4 0 µg/1 and 1 0 µg/1, respectively Total xylene con- centration decreased from 747 µg/1 to 4 0 gg/I MTBE concentration decreased from 83 µg/1 to non-detectable levels In well VW-2, concentration of TPH-G increased from 200 µg/1 to 490 µg/1 Benzene increased from 4 6 gg/I to 81 µg/1 Toluene increased from non-detectable levels to 13 gg/I Ethyl- benzene increased from non-detectable levels to 7 0 µg/1 Total xylene concentration increased from non-detectable levels to 41 gg/1 Concentration of MTBE increased from non-detectable levels to 277 gg/1 0296 01 stocktan]Q01 da