ARCHIVED REPORTS_XR0008602 CASE 1

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Table 2 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 1001110 100mL) MW-8 09/25/91 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 --- --- SEC MW-8 03/25/92 25 66 5.76 19.90 0 00 1400 19 6 6 140 230 --- --- SEQ MW-8 06/25/92 25 66 7.06 18 60 0 00 120 ND<O 3 0 51 ND<O 3 0 50 --- --- SEQ AMW-1 04/26/90 26 53 5.35 21 18 0.00 100 ND<O 3 ND<O 3 ND<O 3 ND<0.3 --- Al AMW-1 07/12/90 26.53 5 58 20 95 0 00 70 ND<O 3 ND<0 3 1 3 0 6 --- ... SAL AMW-1 08/27/90 26.53 5 98 20.55 0 00 --- --- --- --- --- --- -- NA AMW-1 11/02/90 26.53 5.94 20 59 0.00 --- --- --- --- --- ... --- NA AMW-1 11/05/90 26.53 5 97 20 56 0 00 ND<50 ND<0.3 ND<O 3 ND<O 3 ND<O 3 ... --- SAL AMW-1 02/25/91 26.53 4 79 21.74 0 00 ND<50 ND-c0 3 ND<0.3 ND<O 3 ND<0.3 --- ... SAL AMW-1 06/27/91 26 53 5.89 20 64 0.00 ND<50 ND<O 5 ND<O 5 ND4 5 ND<O 5 --- ... CAL AMW-1 09/25/91 26 53 6.53 20 00 0 00 ND<30 ND<0.30 ND<O 30 ND<O 30 ND<O 30 --- ... SEQ AMW-1 12/10/91 26 53 5 67 20 86 0 00 45 ND<0.30 ND<O 30 ND<O 30 ND<O 30 --- SEQ AMW-1 03/25/92 26.53 4 75 21.78 0 00 ND<30 ND<0.30 ND<O 30 ND<O 30 ND<0.30 --- --- SEQ AMW-1 06/25/92 26 53 6 62 19.91 0 00 ND<30 ND<O 30 ND<O 30 ND<0.30 ND<0.30 --- --- SEQ AMW-2 04/26/90 26 45 4 94 21 51 0 00 ND<50 ND<0.3 ND<0.3 ND<O 3 ND<0 3 --- --- Al AMW-2 07/12/90 26.45 5 21 21 24 0 00 ND<50 ND<0.3 ND<0.3 ND<0.3 ND<0.3 ... --- SAL AMW-2 08/27/90 26.45 5 46 20.99 0.00 --- --- --- ... "' ... NA AMW-2 11/02/90 26 45 5.47 20 98 0 00 --- --- --- --- --- --- ... NA AMW-2 11/05/90 26 45 5 49 20 96 0 00 ND<50 ND<0.3 ND<0.3 ND<0 3 ND<0.3 --- --- SAL AMW-2 02/25/91 26 45 4 56 21.89 0 00 ND<50 ND<0.3 ND<0.3 ND<0.3 ND<0.3 --- --- SAL AMW-2 06/27/91 26 45 5 60 20 85 0.00 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ... --- CAL AMW-2 09/25/91 26 45 6.07 20.38 0 00 ND<30 ND<O 30 ND<O 30 ND<O 30 ND<O 30 ... --- SEQ AMW-2 12/10/91 26 45 5.34 21.11 0 00 ND<30 ND<0.30 ND<0.30 ND<O 30 ND<O 30 ... --- SEQ AMW-2 03/25/92 26.45 4 70 21 75 0 00 ND<30 ND<0.30 ND<0.30 ND<O 30 ND<0.30 -.- --- SEQ AMW-2 06/25/92 26.45 6 84 19.61 0.00 ND<30 ND<O 30 ND<O 30 ND<O 30 ND<O 30 --- SEQ AMW-3 08/10/90 25 41 7.46 17.95 0 00 90 0 6 4.1 2.8 21 --- --- SAL AMW-3 08/27/90 25.41 7.46 17 95 0.00 --- ... --- ... --- ... --- NA AMW-3 11/02/90 25.41 --- --- --- --- ... --- ... --- --- --- NA AMW-3 11/05/90 25 41 7 58 17.83 0 00 N0<50 ND<0.3 ND<0.3 ND<O 3 ND<0.3 --- --- SAL AMW-3 02/25/91 25 41 7.03 18.38 0 00 ND<50 ND<O 3 ND<O 3 ND<O 3 ND<O 3 --- --- SAL AMW-3 06/27/91 25 41 7.60 17 81 0.00 ND<50 ND<O 5 ND<O 5 ND<O 5 ND<O 5 --- --- CAL AMW-3 09/25/91 25 41 7.92 17 49 0 00 ND<30 ND<0.30 ND<0.30 ND<0 30 ND<0.30 .-- --- SEQ AMW-3 12/10/91 25 41 7 56 17 85 0 00 ND<30 ND<O 30 ND<O 30 ND<O 30 ND<0 30 --- --- SEQ AMW-3 03/25/92 25 41 7.16 18.25 0.00 ND<30 ND<0.30 ND<O 30 ND<O 30 ND<O 30 --- --- SEQ AMW-3 06/25/92 25 41 8.05 17 36 0.00 ND<30 ND<0.30 ND<0.30 ND<O 30 ND<0.30 --- --- SEQ 30-du1-92 Page 5 of 7