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TABLE 3 j Historical Groundwater Monitoring and Analytical Data Ranch Market 23569 South Santa Fe Road Riverbank,California Well NoJ Ethyl- EPA method 8260 B Elevation Date Benzene 'Toluene benzene Xylenes TPH-G MTBE TBA DIPE ETBA TAME 1,2-DCA EDB DTW** SPT WTE (TOC)* (991L) OWL) I ( ) (AA) (;L ) (u 2) ( ) (tt /L) (u n) (u n-) (f n-) (µ /l) (ft) (ft) (ft) W-4 12/09/98 3,560 4,980 559 4,070 42,500 a 170 <200 <50 <50 <50 - - 27 38 000 7942 10680 12/25/99 1,060 714 207 768 7,120 a 110 <20 <5 <5 <5 <5 <5 2869 000 7811 04/06/00 2,300 2,000 270 1,900 16,000 b 120 <20 <2 0 <2 0 <2 0 31 <2 0 2693 000 7987 08/16/00 3,700 4,400 680 3,600 30,000 b 150 15 <0 50 <0 50 <0 50 <0 50 <0 50 2897 000 77 83 11/16/00 440 240 35 360 2,800 b 67 <10 <1 0 <1 0 <1 0 16 <1 0 2831 000 7849 01/03/01 2,300 2,300 260 1,700 12,000 b 120 14 <1 0 <1 0 <1 0 25 <€ 0 2933 000 7847 04/11/01 5,600 6,100 940 5,400 41,000 b 170 <200 <20 <20 <20 <20 <20 27 87 000 7893 NfW-5 08116100 80 095 10 61 330 41 12 <0 50 <0 50 <0 50 28 <0 50 28 36 000 7763 10599 08/21/00 — — -- — - 2849 000 7750 11/16/00 10 21 20 39 1,100 13 51 <0 50 <050 <0 50 071 <0 50 2759 000 7840 01/03/01 29 1.3 1.8 3.8 600 14 57 <0 50 <0 50 <0 50 051 <0 50 2770 000 7829 04!11101 34 11 66 29 590 12 72 <0 50 <0 50 <0 50 12 <0 50 27 15 000 1 7994 W-5d 08/10/00 f 50 076 17 31 <50 b 32 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 70 72 e 000 10585 08/16/00 10 <0 50 <0 50 087 <50 b 1.5 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 4952 000 5633 I 08/21/00 - - — -- - - -- — -- 2951 000 7634 ! 11116100 <0 50 <0 50 <0 50 <0 50 <50 b <0 50 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 28 08 000 7777 01/03/01 <0 50 053 <0 50 0.57 <50 b <0 50 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 28 08 000 7777 04/11/01 <0 50 <0 50 <0 50 <0 50 <50 b <0 50 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 2770 000 78 15 W-6 08/09/00 f <0 50 <0 50 <0 50 <0 50 <50 b <0 50 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 27 30 d 000 - 105 52 08/16/00 <0 50 <0 50 <0 50 <0 50 <50 b <0 50 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 2656 000 7896 11/16/00 26 14 12 29 690 b 097 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 2605 000 7947 01/03/01 <0 50 <0 50 <0 50 095 <50 b 063 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 2609 000 7943 04/11/01 <0 50 <0 50 <0 50 13 400 b <0 50 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 2579 0 00 7973 W-7 08/16/00 320 390 210 1,100 10,000 b 12 <5 0 <0 50 <0 50 <0 50 17 <0 50 2931 0 00 7701 10632 09/01/00 g 19 15 <0 50 92 830 b <0 50 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 2925 000 7707 11/16/00 40 14 10 31 390 b 087 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 2849 000 77 83 01/03/01 — -- -- — - - - 28 51 000 7781 01/11/01 <0 50 <0 50 <0 50 <0 50 <50 b,C <0 50 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 -- -- 04/11/01 8A 0.80 <0 50 20 160 b <0 50 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 2797 000 78 35 I File ProlectlRtverbanklTablesl RB 01-2Q-GW 1 Page 2 of 5 5/10101