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k J 'tlR p � l 1 F F ':. ::. ...t'f.-:1""+ hPFt.:x+ria.w4sinave'rNKilenvar:M'/. .iSa.'e.�eakwnn`v'aww..na+oauwnwnx:+wwwe...l . . TABLE 2. CONCENTRATIONS. (ug/L) .OF PETROLEUM HYDROCARBON CONSTITUENTS IN GROUNDWATER,'_FORMER EXXON.RS 7--1050, 909 WEST HAMMER LANE,. STOCKTON,:,CALIFORNIA", NOVEMBER 1986 FEBRUARY 1990 E Total Well Petroleum No.:. Date Benzene Toluene X ly enes Ethylbenzene Hydrocarbons Laboratory_ ._ ,f MW1 11 /13/86 58 0.5 1 .3 NA 290 Sequoia MW1 05/26/87 62.2 141 .4 772.4 155.4 2,750 Environ MW1 02/11/88 <05 <0.5 <0.5 <0.5 <100 Enseco MW1 05/23/88 . <0 .5 0.9 <0.5 <0.5 <50 WESCO (Pace) MW1 08/26/88 <05 <0.5 <0.5 <0,5 <50 Pace MW1 01/07/89 <02 <0.2 <0.2 <0.2 <250 Pace MW1 05/04/89 <0` 5 <0.5 <0.5 <0.5 <100 Acurex , MW1 07/19/89 . <0 : 5 1 .5. <0.5 <0.5 <250 Pace MW1 12/19/89 <05 <0..5 <0.5 <0.5 <250 Pace MW1 02/14/90 <05 <0.5 <0.5 <0..5 : <50 Pace MW1 06/28/90 <05 <0.5 <0.5 <0.5 <50 Pace MW2 11/13/86 28 0.5 2.2 NA 290 Sequoia MW2. 06/26/8.7 4ti2 1 .1 2. 1 <0.5 14.9 Environ MW2 : 02/11 /88 <0: 5 . <0.5 <0.5 <0.5 <100 Enseco MW2 05/23/88 <05 <0.5 <0.5 <0.5 <50 WESCO (Pace) x MW2 08/26/$8: <0s5 <0.5 <0.5 <0.5 <50 Pace MW2 01/07/6§ <0.2 0.6 <0.2 <0.2 <250 Pace MW2 05/04/89 c0,5 <0.5 <0.5 <0.5 <100 Acurex MW2 07/1§/89 <0'.5 <0.5 <0.5 <0.5 <250 Pace MW2. 12/19/89 r0.5 <0.5 <0.5 <0.5 <250 Pace a MW2 02/14/90 <0.5 <0.5 <0,5 <0.5 <50 Pace a MW206/28/90 <0�.5 <0.5 <0.5 <0.5 <50 Pace MW3 11 /13/86 7,500( 2,300 NA .890 14,000 Sequoia MW3 06/26/87 3,078: 462.6 979.3 1 , 108 8,381 Environ MW3 02/11/.88 300; 270 260 13 2, 100 Enseco MW3 05/23/88 <0.5 <0.5 .. <0.5 <0.5 <50 WESCO (Pace) NA = Not analyzed. * Well not properly purged before sample collection. # e42/71050/7-90/t2. , .1