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 LAB ID SAMPLING/ ELEVATION TO WATER PRODUCT (CFU/ (CFU/ MONITORING (ft-msl) WATER (ft) ELEVATION THICKNESS 100m[) 1001131) -'------_-^-asraa=--------^"----___aaa===occ=-----------------------------------------'------------------------^---------_---------------'_-_^ 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<O 5 ND<O 5 --- ND<O 5 --- --- SAL MW-1 10/20/87 --- --- --- --- ND<50 ND<O 5 ND<O 5 --- ND<O 5 --- --- SAL MW-1 11/20/87 --- --- --- ... ND<50 ND<O 5 ND<O 5 --- ND<O 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 --- 0<50 N0<O 5 ND<O 5 --- N0<0 5 --- --- SAL MW-1 06/OT/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 N0<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<O 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<O 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 68 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 ND<O 30 NO<O 30 --- --- SEQ MW-1 03/25/92 26 88 5 95 20 93 0 00 ND<30 NO<0 30 ND<O 30 ND<O 30 ND<O 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<O 5 NO<0 5 --- ND<O 5 --- --- SAL MW-2 10/20/87 --- --- --- --- ND<50 ND<O 5 ND<O 5 --- ND<O 5 --- --- SAL MW-2 11/20/87 --- --- --- --- ND<50 ND<0.5 ND<O 5 ND<O 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<0 5 ND<O 5 ND<O 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<O 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<O 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<O 30 ND<O 30 ND<O 30 ND<O 30 --- - SEQ MW-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 18-Jun-92 Page 1 of 6