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TABLE 3 CUMULATIVE SUMMARY OF CONCENTRATIONS (µg/L=ppb) OF PETROLEUM HYDROCARBONS IN THE GROUNDWATER, FORMER EXXON RS 7-3942, STOCKTON, CALIFORNIA Well Ethyl- No Date Benzene Toluene benzene Xylenes _TPH-g GW 1 09/23/86 40,000 43,000 NA 9,900 130,000 ' MWI 01/87 <1 <1 NA <1 <50 MWI 07/16/87 <0 5 1 5 <0 5 <0 50 <100 MWI 04/11/88 <0 5 <0 5 <0 5 <0 5 <100 ' MWI 09/13/88 1 9 2 5 <0 5 <0 5 70 MW1 11/16/88 <0 5 9 5 <0 5 <0 5 130 MWI 02/09/89 1 7 02 02 06 <250 MWI 05/31/89 <0 5 <0 5 <0 5 0 8 <250 MWI 08/17/89 <0 5 <0 5 <0 5 <0 5 <250 MWI 12/19/89 <0 5 1 9 <0 5 <0 5 <250 MWI 03/21/90 <0 5 <0 5 0 8 2 9 80 ' MWI 05/17/90 <0 5 4 5 <0 5 <0 5 120 MWI 09/25/90 <0 5 7 0 1 0 4 7 170 Well dry since 12/19/90 ' MW2 01/87 26 190 NA 1,100 11,000 MW2 07/16/87 68 26 630 1,320 4,800 MW2 04/11/88 94 <20 240 880 11,000 MW2 09/13/88 600 62 520 1,900 7,400 MW2 11/16/88 840 140 650 1,600 10,000 MW2 02/09/89 480 55 660 1,700 7,200 MW2 05/31/89 680 62 800 3,100 17,000 MW2 08/17/89 2,100 430 350 1,700 15,000 Well dry since 03/21//90 MW3 01/87 17 640 NA 400 32,000 MW3 07/16/87 830 600 190 436 1,700 MW3 04/11/88 450 970 210 860 4,600 ' MW3 09/13/88 Not sampled - LPH MW3 11/16/88 <250 3,200 1,900 8,600 61,000 MW3 02/09/89 Not sampled - LPH MW3 05/31/89 Not sampled - LPH MW3 08/17/89 Not sampled - LPH MW3 12/19/89 Not sampled - LPH MW3 03/21/90 Not sampled - LPH Well dry since 05/17/90 MW4 07/16/87 1,100 <50 850 1,750 4,900 ' MW4 04/11/88 510 <25 490 1,100 8,500 MW4 09/13/88 860 40 670 2,400 5,600 < indicates that no concentration greater than the noted detection limit was measured NA = not analyzed LPH = liquid-phase hydrocarbons Data from 1/87 from HLA report 1987 MW1?/13942(1)/QrR1fAn92(r3 l 1