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 B T E X FC FS LA8 ID SAMPLING/ ELEVATION TO WATER PRODUCT (CFU/ (CFU/ MONITORING (ft-msL) WATER (ft) ELEVATION THICKNESS -----100mL) 100mt) z=c=zzxxaaaaxxx=axxaaaxaxaasaaaaazzxasaaaxx aaazzxaaaaaxxxaaaxxxcz==xxxsvzzxznca=xaczzzx xax=sxxacc=========aaa= - AMW-1 04/26/90 26 53 5 35 21.18 0 00 100 ND<O 3 ND<O 3 00 3 ND<0 3 ... --- Al AMW-1 07/12/90 26 53 5 58 20 95 0.00 70 ND<O 3 ND4 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<O 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<O 3 ND<O 3 ND<O 3 ND<O 3 ... ... SAL AMW-1 06/27/91 26 53 5 89 20 64 0 00 ND<50 ND<O 5 ND<O 5 ND<O 5 ND<O 5 --- ... CAL AMW-1 09/25/91 26.53 6.53 20 00 0 00 N0<30 ND<O 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<O 30 ND<O 30 ND<O 30 ND<O 30 SEQ AMW-2 04/26/90 26 45 4 94 21 51 0 00 ND<50 NO<0 3 ND<0 3 ND<O 3 ND<O 3 --- --- Al AMW-2 07/12/90 26 45 5 21 21.24 0.00 ND<50 ND<O 3 ND<O 3 ND<O 3 ND<O 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 ANW-2 11/05/90 26 45 5 49 20 96 0 00 ND<50 ND<O 3 ND<O 3 ND<O 3 ND<O 3 ... --- SAL AMW-2 02/25/91 26.45 4.56 21 89 0.00 ND<50 ND<O 3 ND<O 3 ND<O 3 NO<O 3 --- --- SAL AMW-2 06/27/91 26.45 5 60 20 85 0 00 ND<50 ND<O 5 ND<O 5 ND<O 5 ND<O 5 --- --- CAL AMW-2 09/25/91 26 45 6 07 20.38 0 00 ND<30 ND<O 30 ND<0 30 NO<O 30 ND<O 30 ... SEQ AMW-2 12/10/91 26 45 5.34 21 11 0 00 ND<30 ND<O 30 ND<O 30 ND<O 30 ND<O 30 --- --- SEQ AMW-2 03/25/92 26 45 4 70 21 75 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 ND<50 ND<0 3 ND<O 3 ND<O 3 ND<O 3 --- SAL AMW-3 02/25/91 25 41 7 03 18 38 0.00 ND<50 ND<0 3 ND<O 3 ND<0 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<O 30 ND<O 30 ND<0 30 ND<O 30 --- SEQ __. AMW-3 12/10/91 25 41 7 56 17.85 0 00 ND<30 ND<0 30 ND<O 30 ND<O 30 ND<O 30 SEQ AMW-3 03/25/92 25 41 7 16 18 25 0.00 ND<30 ND<O 30 ND<O 30 ND<O 30 ND<O 30 --- ... SEQ AMW-4 08/10/90 25.36 4.83 20 53 0 00 ND<50 0 6 0 7 2 9 4 2 --- --- SAL AMW-4 08/27/90 25 36 4.83 20 53 0 00 --- --- - --- --- --- --- NA AMW-4 11/02/90 25 36 4 89 20.47 0.00 --- --- --- --- --- --- NA ANW-4 11/05/90 25 36 4.88 20 48 0.00 ND<50 0 3 ND<O 3 N0<O 3 ND<O 3 ... SAL AMW-4 02/25/91 25.36 4.08 21 28 0 00 ND<50 ND<O 3 ND<O 3 ND<O 3 ND<O 3 --- --- SAL AMW-4 06/27/91 25 36 5.01 20 35 0 00 ND<50 ND<O 5 ND<O 5 ND<O 5 ND<0 5 --- --- CAL AMW-4 09/25/91 25 36 5 45 19 91 0 00 ND<30 ND<O 30 ND<O 30 ND<O 30 ND<O 30 --- --- SEQ AMW-4 12/10/91 25 36 4 79 20 57 0.00 ND<30 ND<O 30 ND<O 30 ND<O 30 ND<O 30 --- --- SEQ AMW-4 03/25/92 25 36 4 26 21 10 0 00 ND<30 ND<O 30 ND<O 30 ND<O 30 ND4 30 --- --- SEQ 18-Jun-92 Page 5 of 6