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TABLE 2 CUMULATIVE SUMMARY OF CONCENTRATIONS (pg/L) OF <br /> PETROLEUM HYDROCARBONS IN GROUNDWATER <br /> SAMPLES, CHEVRON SS 9-1918, STOCKTON, CALIFORNIA, <br /> NOVEMBER 1988 - JANUARY 1992 <br /> Well Ethyl- <br /> No Date Benzene Toluene benzene Xylenes TPH-g <br /> MW1 11/15/88 <0 5 <0 5 <0 5 <0 5 <50 <br /> 02/07/89 <0 2 <0.2 <0 2 <0 2 <250 <br /> 04/13/89 <0 5 <0 5 <0 5 <0 5 <250 <br /> Well has been dry since 7/12/89 <br /> MW2 11/15/88 3 0 49 <0 5 0.9 77 <br /> 02/07/89 0 6 04 <0 2 <0 2 <250 <br /> 04/13/89 19 2 4 09 <0 5 <250 <br /> 07/21/89 3 0 2 0 06 <0 5 <250 <br /> 09/21/89 2 4 4.1 <0 5 <0 5 270 <br /> 12/18/89 2 6 2 7 <0 5 <0 5 <250 <br /> 03/22/90 43 <0 5 0.5 <0 5 <250 <br /> Well has been dry since 6/28/90 <br /> • MW3 11/15/88 2,700 360 2,800 2,000 9,300 <br /> 02/07/89 1,600 160 340 440 3,900 <br /> 04/13/89 2,600 650 690 1,700 7,800 <br /> 07/12/89 690 550 230 380 4,600 <br /> Well has been dry since 9/21/89 <br /> MW4 11/15/88 1,500 3,300 330 1,300 6,800 <br /> 02/07/89 5,200 17,000 1,300 4,400 32,000 <br /> 04/13/89 10,000 42,000 4,100 16,000 61,000 <br /> 07/12/89 1,900 1,900 430 1,000 13,000 <br /> Well has been dry since 9/21/89 <br /> MW5 11/15/88 2 3 4 5 <0 5 <0 5 400 <br /> 02/07/89 110 27 15 15 390 <br /> 04/13/89 830 7 7 150 <0 5 1,400 <br /> 07/12/89 2,300 <0 5 640 <0 5 5,200 <br /> Well has been dry since 9/21/89 <br /> MW6 11/15/88 <0 2 <0 2 <0 2 <0 2 <250 <br /> 02/07/89 63 19 <5 150 1,300 <br /> 04/13/89 68 18 180 130 1,600 <br /> 07/12/89 5 0 26 27 32 1,800 <br /> • Well has been dry since 9/21/89 <br /> Note Wells MW1-MW8 were last gauged on 16 September 1991 <br /> WP51/91918(1)/QIRIJAN92n2-4 Page I <br />