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TABLE 1 CUMULATIVE SUMMARY OF CONCENTRATIONS (pg/L) OF PETROLEUM HYDROCARBONS IN GROUNDWATER <br /> SAMPLES FROM WELLS MWI, MW2, MW4, MW7, AND MW8, FORMER EXXON RS 7-3942, STOCKTON, <br /> CALIFORNIA <br /> MW8 MW 1 MW4 MW7 MW2 <br /> Date Benzene TPH Benzene TPH Benzene TPH Benzene TPH Benzene TPH <br /> 07/16/87 -- -- -- -- -- -- 78 1,000 <br /> 04/11/88 740 120,000 <0.5 <100 510 8,500 26 1,200 94 11,000 <br /> 09/13/88 470 56,000 1.9 70 860 5,600 dry dry 600 7,400 <br /> 11/16/88 <500 63,000 <0.5 130 860 8,000 dry dry 840 10,000 <br /> 02/09/89 650 62,000 1.7 <250 630 4,800 dry dry 480 7,200 <br /> 05/31/89 460 66,000 <0.5 <250 790 6,000 dry dry 680 17,000 <br /> 08/17/89 640 72,000 <0.5 <250 1,000 8,100 dry dry 2,100 15,000 <br /> 12/19/89 190 21,000 <0.5 <250 190 7,900 dry dry dry dry <br /> 03/21/90 880 63,000 <0.5 80 400 3,200 dry dry drys dry <br /> 05/17/90 520 67,000 <0.5 120 300 3,500 dry dry dry` dry <br /> 05/02/91 830 57,000 dry dry dry dry dry dry, dry, dry <br /> 73942/L.RPf792JTl,3 <br />