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1 California Department of Transportation June 7, 1999 <br /> Shop 10 Maintenance Station, Stockton, California Project No 103872-02 <br />' xylenes also decreased from 5 ppb to 4 3 ppb, from 81 ppb, to 75 ppb, and from 130 ppb to 35 <br /> ppb, respectively, since December 1998 <br /> Well MW-14 had a decrease in benzene concentration from 0 9b t <br /> pp to non-detect levels since <br /> December 1998 <br /> Total xylenes decreased in well MW-19 from 4 ppb to non detect since December 1998 <br /> Benzene increased slightly in well MW-24, from 0 9 ppb in December 1998 to 3 I ppb this <br />' round Concentrations of ethylbenzene and toluene decreased from 1 ppb and 6 ppb to non detect <br /> since December 1998 <br />' Concentrations of benzene, toluene, ethylbenzene, and total xylenes decreased in well MW-25 <br /> from 18 ppb, 20 ppb, 2 ppb, and 1 I ppb to non-detect since December 1998 <br /> TPH-g was detected in well VM-1 at concentrations of 25,700 ppb compared to levels of 1,000 <br /> ppb from samples collected December 1998 Concentrations of BTEX have increased since De- <br /> cember 1998 Concentrations of benzene have increased from 82 ppb to 4,600 ppb, toluene has <br /> increased from 61 ppb to 980 ppb, ethylbenzene has increased from 41 ppb to 53 ppb, and con- <br /> centrations of total xylenes have increased from 55 ppb to 2,600 ppb TPH-d was detected to <br /> well VM-i, at concentrations of 6,100 ppb this round compared to levels of<400 ppb found in <br /> December 1998 <br /> TPH-g increased in concentration in well VM-2 with levels of 44,700 ppb compared to 4,200 <br /> ppb in December 1998, and concentrations of TPH-d increased from 730 ppb to 4,100 ppb dur- <br /> ing the same period VM-2 had increased concentrations of BTEX, except for ethylbenzene, <br /> Iwhich decreased since December 1998 Benzene increased from 510 ppb to 7,500 ppb, toluene <br /> increased from 280 ppb to 2,700 ppb, ethylbenzene decreased from 150 ppb to 120 ppb, and <br /> 1 concentrations of total xylenes increased from 150 ppb to 2,940 ppb <br /> According to laboratory analytical data for 8260b, other VOCs that were detected during the cur- <br /> rent groundwater sampling event are 1,2-dichloroethane, 1,2-dibromoethane, 1,2,4- <br /> shop 10 5 <br />