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` - <br /> TABLE 3 TRENDS IN CONCENTIRATION (ug/L) OF PETROLEUM fiDROCAR$ON CONSTITUENTS IN GROUNDWATER, <br /> FORMER_EXXON. RS :7-1050.'.:909 WEST HAMMER LANE STOCKTON CALIFORNIA <br /> Total <br /> Well Petroleum <br /> No. Date Benzene. Toluene Xylenes Ethylbenzene Hydrocarbons Laboratory <br /> MW1 11/13/.86 5.8 0.5 1 .3 NA 290 Sequoia <br /> MW1 :06/26/87 62.2 141 .4 772.4 155.4 2,750 Environ <br /> MW1 02/1.1 /88 <0.5 <0:'5 <0.5 <0.5 <100 Enseco <br /> MW1 05/23/88 <0.5 0.9 <0.5 " <0. 5 c50 WESCO (Pace) <br /> MW1 08/26/88 <0.5 <0.5 <0.5 : <0. 5 <50 Pace <br /> MW.1 0.1/07/8,9 -<0.2 <0.2 <0.2 <0.2 <250 Pace <br /> MW1 05/04/89 <0.5. <0.5 <0.5 <0. 5 <100 Acurex <br /> MW1 07/1.9/8.9 <0. 5 1 .5 <0. 5 <0.5 <250 Pace <br /> MW2 11/.13/86 28 0. 5 2.2 NA 290 Sequoia <br /> MW2 06/'26/8;7 4.2 1 . 1 2. 1 <0. 5 19.9 Environ <br /> MW2 02/11/88 <0.5 <0.5 <0.5 <0. 5 < 100 Enseco <br /> MW2 05/23/88 <0.5 <0. 5 <0.5 <0.5 <50 WESCO (Pace) <br /> MW2 08/26/88. <0.5 <0.5 <0.5 <0.5 <50 Pace <br /> MW2 01/07/8.9 <0.2 0.6 . <0.2 <0.2 <250 Pace <br /> MW2 05/04/89 <0.5 <0.5 <0.5 <0.5 < 100 Acurex <br /> MW2 07/19/8.9 <0.5. <0. 5. <0.5 <0.5 <250 Pace <br /> MW3 11/13/86. 7,500 2,300 NA 890 14, 000 Seq,_oia f <br /> MW3 06/26/8;7 3,078 462.6 979.3 1 , , 08 8,381 Environ <br /> MW3 02/1.1/88 300 270 260 13 2, 100 Enseco <br /> MW3 05-/23/88 <0 5 <0.5 <0. 5 0.5 <50 WESCO (Pace) <br /> MW3 08/26/88 140 100 .140 10 600 Pace "' <br /> MW3 01`/07/89 120 360 510 75 510 Pace <br /> MW3 .. 05/04/89 140 520 520 . 110 8, 100 Acurex <br /> MW3* 07/19/89 390 180 370 220 2,800 Pace <br /> NA Not analyzed., <br /> * Well not properly purged before- sample:col Iection. <br /> e25/7"1050/8-89/tb1;3... <br />