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TABLE 3 CUMULATIVE SUMMARY OF CONCENTRATIONS <br /> (pg/L = ppb) OF PETROLEUM HYDROCARBONS IN <br /> GROUNDWATER SAMPLES, FORMER EXXON <br /> RS 7-3942, STOCKTON, CALIFORNIA <br />' Well Ethyl- <br /> No Date Benzene Toluene benzene Xylenes TPH-g <br /> GW 1 09/23/86 40,000 43,000 NA 9,900 130,000 <br />' MW1 01/87 <1 <1 NA <1 <50 <br /> 07/16/87 <0 5 15 <0 5 <0 50 <100 <br /> 04/11/88 <0 5 <0 5 <0 5 <0 5 <100 <br />' 09/13/88 19 25 <0 5 <0 5 70 <br /> 11/16/88 <0 5 9 5 <0 5 <0 5 130 <br /> 02/09/89 17 02 0 2 06 <250 <br />' 05/31/89 <0 5 <0 5 <0 5 0 8 <250 <br /> 08/17/89 <0 5 <0 5 <0.5 <0 5 <250 <br /> 12/19/89 <0 5 19 <0.5 <0 5 <250 <br />' 03/21/90 <0 5 <0 5 0 8 29 80 <br /> 05/17/90 <0 5 4 5 <0 5 <0 5 120 <br /> 09/25/90 <0 5 7.0 10 47 170 <br /> Well dry since 12/19/90 <br /> 04/30/92 Insufficient water to sample <br />' 08/13/92 Insufficient water to sample <br /> MW2 01/87 26 190 NA 1,100 11,000 <br />' 07/16/87 68 26 630 1,320 4,800 <br /> 04/11/88 94 <20 240 880 11,000 <br /> 09/13/88 600 62 520 1,900 7,400 <br />' 11/16/88 840 140 650 1,600 10,000 <br /> 02/09/89 480 55 660 1,700 7,200 <br /> 05/31/89 680 62 800 3,100 17,000 <br /> 08/17/89 2,100 430 350 1,700 15,000 <br />' Well dry since 03/21/90 <br />' MW3 01/87 17 640 NA 400 32,000 <br /> 07/16/87 830 600 190 436 1,700 <br /> 04/11/88 450 970 210 860 4,600 <br /> 1 <br /> < indicates that no concentration greater than the noted detection limit was measured <br />' NA = not analyzed <br /> LPH = liquid-phase hydrocarbons <br /> Data from 1/87 from HLA report 1987 <br /> 73942(1)/Q492/r3 2 Page 1 <br /> I <br />