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31 ' CHAPIN BORTHERS INVESTMENTS - 1766 MONTE DIABLO AVE, STOCKTON GROUND WATER EXTRACTION DATA- INFLUENT SAMPLES EW1 date TPH-g Benzene Toluene Ethyl Xylene MTBE 30-May-02 940 58 21 55 24 <5 0 19-Sep-02 ,, 710 1 1 <0 5 <0 5 66 <5 0 15-Oct-02 1,500 20 1 9 28 33 <17 17-Feb-03 7,700 48 91 320 460 <25 24-Mar-03 9,600 35 <12 750 640 <12 15-Apr-03 2,900 15 41 50 260 - 21-May-03 4000 16 <5 0 150 300 15-Jun-03 6700 32 88 610 470 21-Jul-03 6400 20 39 420 260 19-Aug-03 930 83 45 33 26 120 16-Sep-03 600 42 <0 5 <0 5 29 <0 5 18-Oct-03 500 10 <0 5 42 55 <0 5 17-Nov-03 320 15 14 78 57 100` 24-Nov-03 410 12 8 9 41 77* 15-Dec-03 910 95 39 34 27 42" EW2 date TPH-g Benzene Toluene Ethyl Xylene MTBE 30-May-02 6,800 300 23 270 170 <50 19-Sep-02 8,100 320 31 130 490 <100 15-Oct-02 6,100 280 21 370 390 <50 17-Feb-03 6,100 210 18 140 180 <50 24-Mar-03 4,900 150 95 160 160 <5 0 15-Apr-03 2,200 58 24 68 55 - 21-Ma 793 4,600 150 74 100 92 15-Jun-03 3800 130 96 130 93 21-Jul-03 2700 80 11 47 32 19-Aug-03. 5100 900 28 31 90 [!45 16-Sep-03 1 1,300 32 23 38 35 <0 5 18-Oct-03 4,700 77 1 3 3 30 83 <0 5 17-Nov-03 570 31 17 33 23 450* 24-Nov-03 910 90 11 j 72 93 36" 15-Dec-03 2,400 39 81 11 45 <0 5" EW3 date TPH-g Benzene Toluene Ethyl Xylene MTBE 30-May-02 27,000 1,600 410 1,300 5,400 <500 19-Sep-02 12,000 670 44 <10 1,600 <100 15-Oct-02 11,000 850 110 750 1,600 <100 17-Feb-03 11,000 340 70 310 1,100 <50 24-Mar-03 14,000 1200 140 240 2,100 <25 15-Apr-03 11,000 840 91 <10 1,400 - 21-Ma -03 14,000 740 100 420 1,700 15--Jun-03 9900 700 110 26 1900 21-Jul-03 7000 180 32 <0 5 880 19-Aug-03 23,000 440 60 7 8 1400 70 16-Sep-03 3,100 130 16 2 1 340 <0 5 18-Oct-03 5,200 240 30 170 700 <0 5 17-Nov-03 5,300 1400 75 790 900 230" 24-Nov-03 2,100 30 16 270 560 180" 15-Dec-03 7,100 550 52 22 910 57'