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-msl) WATER (ft) ELEVATION THICKNESS 100ml) 100m1) sesesaaeeer===q�==aa=ear sacccsss=sseesax===sa=sseec======cccssssssccc=cnccsss==assns=======ssssssssseea====scccsss=sssse====vc=_ccs=ssssss MW-1 02/09/87 ... - --- ... ND<50 ND<O 5 ND<O 5 --- ND<O 5 ... ... SAL MW-1 09/21/87 --- --- --- --- ND<50 ND<0.5 ND<O 5 --- ND<O 5 --- --- SAL MW-1 10/20/87 ... --- --- --- ND<50 ND<0.5 NO<O 5 --- ND<O 5 --- ... SAL MW-1 11/20/87 --- ... --- --- ND<50 ND<O 5 ND<O 5 --- ND<0.5 --- SAL MW-1 03/13/88 26 88 5 88 21 00 - --- --- --- --- --- --- NA MW-1 03/23/88 26 88 5 88 21 00 --- ND<50 ND<O 5 ND<O 5 --- ND<O 5 --- --- SAL MW-1 06/07/88 26 88 5.95 20 93 - --- --- --- --- --- --- --- NA MW-1 10/18/88 26 88 6 25 20.63 --- ND<50 ND<O 5 ND<O 5 ND<O 5 ND<O 5 ... SAL MW-1 02/15/90 26 88 5.95 20.93 0 00 ND<50 ND<O 3 ND<O 3 ND<O 3 ND<O 3 --- --- SAL MW-1 04/26/90 26 88 6 08 20 80 0 00 --- -•- --- --- --- -^• NA MW-1 07/12/90 26 88 6.11 20.77 0.00 ND<50 ND<0.3 ND<O 3 ND<O 3 ND<O 3 --- --- SAL MW-1 08/27/90 26.88 5 45 21 43 0.00 --- --- ... --- --- --- --- NA MW-1 11/02/90 26 88 6 51 20 37 0 00 --- --- ••. ••. ... ... ... NA MW-1 11/05/90 26 88 6.53 20 35 0 00 ND<50 ND<O 3 ND<O 3 ND<O 3 ND<O 3 --- - SAL MW-1 02/25/91 26 88 5.75 21.13 0.00 ND<50 ND<0.3 ND<O 3 ND<O 3 ND<O 3 --- --- SAL MW-1 06/27/91 26 88 6 66 20 22 0 00 ND<50 ND<O 5 ND<O 5 ND<O 5 ND<O 5 --- --- CAL MW-1 09/25/91 26 88 7 04 19 84 0 00 ND<30 ND<O 30 ND<O 30 ND<O 30 ND<O 30 --- --- SEQ MW-1 12/10/91 26 88 6 46 20 42 0 00 ND<30 ND<O 30 ND<O 30 ND4 30 ND<O 30 .-- --- SEQ MW-1 03/25/92 26.88 5 95 20 93 0.00 NO<30 ND<O 30 ND<O 30 ND<O 30 ND<0.30 ... ... SEQ MW-1 06/25/92 26.88 8 02 18 86 0 00 ND<30 ND<O 30 ND<O 30 ND<O 30 ND<0 30 --• --- SEQ MW-2 09/02/86 ... --- --- ND<50 ND<1 ND<1 ... ND<1 --- --- SAL MW-2 02/09/87 --- --- -- --- ... ._. ... --- --- --- --- NA MW-2 09/21/87 ... ... --• ••• ND<50 ND<0.5 ND<O 5 ... ND<O 5 --- --- SAL MW-2 10/20/87 ... --- •-- ... ND<50 ND<O.5 ND<O 5 --- ND<0 5 ... ... SAL MW-2 11/20/87 ... --- --- ... ND<50 ND<O 5 ND<O 5 ... ND<0.5 ... ... SAL MW-2 03/13/88 26.33 5.67 20.66 --- ... ... --- --- ... --- --- NA MW-2 03/23/88 26.33 5.63 20.70 --- ND<50 ND<O 5 ND<O 5 --- ND<O 5 ... - SAL MW-2 06/07/88 26 33 5 70 20 63 --- --- --- ... ... •.. --- ... NA MW-2 10/18/88 26 33 5 70 20 63 ND<50 ND<O 5 ND<O 5 ND<O 5 ND<0.5 --- --- SAL MW-2 02/15/90 26 33 5 35 20 98 0 00 50 43 0 8 0 7 1 6 --- --- SAL MW-2 04/26/90 26 33 5 50 20.83 0 00 --- --- --- --- --- NA MW-2 07/12/90 26 33 5.48 20.85 0.00 80 0 4 1 3 0 5 15 --- --- SAL MW-2 08/27/90 26 33 5 80 20.53 0.00 - --- --- --- --- ... --- NA MW-2 11/02/90 26.33 5 85 20 48 0 00 --- --- ... -_- ... --- --- NA MW-2 11/05/90 26 33 5 87 20 46 0 00 ND<50 ND<O 3 ND<O 3 ND<4 3 ND<O.3 --- --- SAL MW-2 02/25/91 26 33 5.34 20 99 0 00 ND<50 ND<O 3 ND<O 3 ND<O 3 ND<O.3 ... --- SAL MW-2 06/27/91 26 33 6 07 20 26 0 00 ND<50 ND<0.5 ND<O 5 ND<O 5 ND<O 5 --- --- CAL MW-2 09/25/91 26.33 6.36 19.97 0 00 ND<30 ND<0 30 ND<O 30 ND<O 30 ND<Q.30 --- --- SEQ 14W-2 12/10/91 26 33 5.86 20.47 0 00 ND<30 ND<O 30 ND<O 30 ND<O 30 ND<O 30 --- --- SEQ MW-2 03/25/92 26 33 5 42 20 91 0 00 240 42 1 8 0 80 3 8 --- --- SEQ MW-2 06/25/92 26 33 7 33 19.00 0.00 ND<30 ND<O 30 ND<O 30 ND<O 30 ND<0.30 ... --- SEQ 30-Ju1-92 Page 1 of 7