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s � <br /> TABLE 2 CONCENTRATIONS (�Lg/L) OF PETROLEUM HYDROCARBON CONSTITUENTS IN <br /> GROUNDWA'T'ER, FORMER EXXON RS 7-1050, 909 WEST HAMMER LANE, <br /> STOCKTON, CALIFORNIA, NOVEMBER 1986 - MARCH 1991 <br /> Total <br /> Petroleum <br /> Well <br /> No. Date Benzene Toluene Xylenes Ethy_lbenzene Hydrocarbons <br /> Laboratory <br /> MW1 11/13/66 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 02/11/88 <0.5 <0.5 <0.5 <0.5 <100 Enseco <br /> MW1 05/23/88 <0.5 0.9 <0.5 <0.5 <50 WESCO (Pace) <br /> MW1 08/26/88 <0.5 <0.5 <0.5 <0.5 <50 Pace <br /> MW1 01/07/89 <0.2 <0.2 <0.2 <0.2 <250 Pace <br /> MW1 05/09/89 <0.5 <0.5 <0.5 <0.5 <100 Acurex <br /> MW1 07/19/89 <0.5 1.5 <0.5 <0.5 <250 Pace <br /> MW1 12/19/89 <0.5 <0.5 <0.5 <0.5 <250 Pace <br /> MW1 02/14/90 <D.5 <0.5 c0.5 <0.5 <50 Pace <br /> MW1 06/28/90 <0.5 <0.5 <0.5 <0.5 <50 Pace <br /> MW1 09/19/90 <0.5 <0.5 <0.5 <0.5 <50 Pace <br /> MW1 12/27/90 <0.5 <0.5 <0.5 <0.5 <50 Pace <br /> MW1 03/29/91 <0.3 <0.3 <1 <0.3 <50 Med-Tox <br /> MW2 31/13/86 28 0.5 2.2 NA 290 Sequoia <br /> MW2 06/26/87 4.2 1.1 2.1 <0.5 14.9 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 01/07/89 <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 07/19/89 <0.5 <0.5 <0.5 <0.5 <250 Pace <br /> MW2 12/19/89 <0.5 <0.5 <0.5 <0.5 <250 Pace <br /> MW2 02/14/90 <0.5 <0.5 <0.5 <0.5 <50 Pace <br /> MW2 06/28/90 <0.5 <0.5 <0.5 <0.5 <50 Pace 3 .. <br /> MW2 09/19/90 <0.5 <0.5 <0.5 <0.5 <50 Pace <br /> MW2 12/27/90 <0.5 <0.5 <0.5 <q.5 <50 Pace <br /> MW2 03/29/91 <0.3 <0.3 <1 <0.3 <50 Med-Tox <br /> 1 . <br /> NA W Not analyzed. <br /> 3 . <br /> e57/110501M.Y911t2 <br />