ARCHIVED REPORTS_XR0008604 CASE 1

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Table 1 30-0140 Summary of Results of Ground Water Monitoring and Sampling Former Mobil Station 04-NP4 2375 Tracy Boulevard, Tracy, California Concentrations in parts per billion (ppb) WELL DATE OF CASING DEPTH GROUND FREE TPH-G 8 T E x FC FS LAB ID SAMPLING/ ELEVATION TO WATER PRODUCT (CFU/ (CFU/ MONITORING (ft-mst) WATER (ft) ELEVATION THICKNESS 100m() 1001110 ---------------------------------------------------------------------------- MW-7 02/09/87 0 00 --- 6300 420 92 --- 1200 --- SAL --- MW-7 09/21/87 --- --- 0 OD --- ND<50 ND<O 5 ND<O 5 ND<O 5 - --- SAL MW-7 10/20/87 --- --- 0 00 --- 65 ND<O 5 NO<0 5 --- 0 07 -- -- SAL MW-7 11/20/87 ... ... 0 00 --- ND<50 ND<O 5 ND<O 5 --- ND<O 5 --- SAL MW-7 03/13/88 26 50 6.75 19 75 - - --- --- --- --- ... --- --- NA MW-7 03/23/88 26 50 6 96 19 54 --- 57 5 9 ND<O 5 --- 1 --- SAL MW-7 06/07/88 26 50 6 75 19 75 --- --- --- --- --- --- --- NA MW-7 10/18/88 26 50 7 10 19 40 --- ND<50 ND<O 5 ND<O 5 ND<O 5 ND<O 5 --- --- SAL MW-7 02/15/90 26 50 5 80 20 70 0 00 3400 9 4 7 3 70 170 - --- SAL MW-7 04/26/90 26.50 6.63 19 87 0 00 --- --- --- --- --- --- --- NA MW-7 07/12/90 26 50 6 66 19 84 0 00 ND<50 ND<O 3 ND<O 3 ND<O 3 ND<O 3 --- --- SAL MW-7 08/27/90 26 50 6.86 19.64 0 00 --- --- - - --- --- -- NA MW-7 11/02/90 26 50 7 03 19 47 0 00 --- --- ... --- --- --- NA MW-7 11/05/90 26 50 7 04 19 46 0 00 ND<50 ND<O 3 ND<O 3 ND<O 3 ND<O 3 --- SAL MW-7 02/25/91 26 50 6 30 20 20 0 00 NO<50 ND<O 3 ND<O 3 ND<O 3 ND<O 3 --- --- SAL MW-7 06/27/91 26 50 7.14 19 36 0 00 ND<50 k0<0 5 ND<O 5 NCO 5 ND<O 5 --- --- CAL MW-7 09/25/91 26 50 8 50 18 00 0 00 ND<30 ND<O 30 ND<O 30 ND<O 30 ND<O 30 --- --- SEG MW-7 12/10/91 26 50 6 98 19 52 0 00 ND<30 ND<O 30 ND<0.30 NO<0 30 ND<O 30 --- --- SEQ MW-7 03/25/92 26.50 6.53 19.97 0 00 ND<30 ND<O 30 ND<O 30 ND<O 30 ND<O 30 --- - SEQ MW-8 09/21/87 --- --- --- 2200 32 3 --- 480 --- --- SAL MW-8 10/20/87 --- --- --- --- 3800 20 5 --- 210 ... --- SAL MW-8 11/20/87 --- --- --- 140 NO<O 5 ND<O 5 --- 16 --- - SAL MW-B 03/13/88 25 66 6 08 19 58 -- --- ... --- ... --- --- --- NA MW-8 03/23/88 25 66 6 00 19.66 --- 15000 280 210 --- 3000 ... --- SAL MW-8 06/07/88 25 66 6 20 19 46 --- --- --- --- --- --- --- NA MW-8 10/18/88 25 66 6 53 19 13 --- 3400 28 ND<O 5 ND<O 5 630 ... --- SAL MW-8 02/15/90 25 66 6 55 19 11 0 00 ND<50 ND<O 3 ND<O 3 ND<O 3 ND<O 3 ... --- SAL MW-8 04/26/90 25 66 5 93 19 73 0 00 --- --- --- --- --- --- --- NA MW-8 07/12/90 25 66 5 98 19 68 0 00 1100 27 13 360 1000 --- - SAL MW-8 08/27/90 25.66 6 27 19 39 0 00 --- --- --- --- -" --- --- NA MW-8 11/02/90 25.66 6 35 19 31 0 00 --- --- --- --- ... --- NA MW-8 11/05/90 25.66 6 38 19 28 0 00 2200 23 7 130 340 --- --- SAL MW-8 02/25/91 25.66 5 53 20 13 0 00 8100 20 21 150 240 ... --- SAL MW-8 06/27/91 25.66 6 38 19 28 0 00 3100 7 3 NO<O 5 140 330 --- --- CAL MW-8 D9/25/91 25 66 6.81 18.85 0 00 6300 13 4 1 190 250 --- SEQ MW-8 12/10/91 25 66 6 25 19 41 0.00 3600 7 5 2 4 90 120 --- SEQ MW-8 03/25/92 25 66 5 76 19 90 0 00 1400 19 6 6 140 230 --- --- SEQ 18-Jun-92 Page 4 of 6