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i Table 1 Summary of Results of Ground Water Sampling Chevron Service Station # 9-6465 5608 North Pershing Drive, Stockton, California Concentrations in parts per billion (ppb) WELL DATE OF CASING DEPTH GROUND TPM-G B T E X 1 ,2-DCA LAB ID SAMPLING/ ELEVATION TO WATER MONITORING WATER ELEVATION MW-5 02/04/88 7 75 26 61 -18 86 ND(1000 ND<O 5 ND(O 5 ND(O 5 ND<O 5 --- B & C MW-5 06/28/88 7 72 27 65 -19 93 ND<1000 ND<O 5 NO(0 5 ND(O 5 ND<O 5 --- B & C MW-5 09/14/88 7 72 29 36 -21 64 50 ND<O 1 ND(1 ND(1 ND<1 ND<O 1 CCAS MW-5 12/16/88 7 72 30 66 -22 94 ND<500 ND<5 ND(10 ND(10 ND(10 ND<10 CCAS MW-5D 12/16/88 7 72 30 66 --22 94 100 ND10 2 ND12 ND12 ND12 -- CCAS MW--5 03/23/89 7 72 30 70 -22 98 ND<500 ND<O 5 ND<O 5 ND<O 5 ND<O 5 --- SAL MW-5 07/19/89 7 72 32 13 -24 41 ND<500 1 0 9 ND<O 5 1 --- SAL MW-5 10/05/B9 7 50 33 42 -25 92 ND<250 ND<O 5 ND<O 5 ND<O 5 ND(O 5 --- PACE MW-5 04/11/90 7 50 --- --- ---- ND(O 3 ND(O 3 ND<O 3 ND<O 6 --- GTEL MW-5 07/04/90 7 50 --- --- --- ND<O 3 ND<O 3 ND<O 3 ND(O 6 --- GTEL MW-5 05/09/90 7 50 --- --- ND(50 ND(O 3 ND(O 3 ND(O 3 ND<O 6 --- GTEL MW-5 07/04/90 7 50 34 45 -26 95 ND<50 ND<O 3 ND<O 3 ND<O 3 ND<O 6 --- GTEL MW-5D 07/04/90 7 50 34 45 --- ND(50 ND<O 3 ND(O 3 ND<O 3 ND<O 6 --- GTEL MW-5* 10/22/90 7 50 --- --- --- MW-5* 01/19/91 7 50 35 95 -28 45 --- --- --- --- --- --- NA MW-5* 07/21/91 7 50 36 49 -28 45 --- --- --- --- --- --- NA MW-5A 03/19/90 7 20 ----- ---- --- - --- --- --- --_ NA MW-5A 04/11/90 7 20 --- --- --- ND<O 3 ND<O 3 ND<O 3 ND<O 6 --- GTEL MW-5A 05/09/90 7 20 33 76 -26 56 ---- ND<O 3 ND<O 3 ND(O 3 ND<O 6 --- GTEL MW-5A 08/17/90 7 20 34 84 -27 64 ND<50 ND<O 3 ND<O 3 ND(O 3 ND<O 6 --- GTEL MW-5A 10/22/90 7 20 35 36 -28 16 ND(50 0 9' 1 ND<O 3 1 --- GTEL MW-5A 01/19/91 7 20 35 72 -28 52 120 0 9 3 2 11 --- SAL MW-5A 07/21/91 7 20 36 25 -28 52 ND<50 ND(O 5 ND<O 5 ND<O 5 ND(O 5 --- SAL MW-6 06/28/88 8 70 27 51 -18 81 ND<1000 ND<O 5 ND<O 5 ND<O 5 ND<O 5 --- B & C MW-6 09/14/88 8 10 28 61 -20 51 240 3 4 ND(1 ND<1 ND<1 0 7 CCAS MW-6 12/19/88 8 10 31 76 -23 66 100 2 7 ND<2 ND<2 ND<2 1 4 CCAS MW-6 03/23/89 8 10 31 77 -23 67 900 2 8 ND(O 5 1 3 1 4 --- SAI. MW-6* 07/19/89 8 10 32 30 -24 20 --- --- --- --- ---- --- NA MW-6* 10/05/89 7 97 32 40 -24 43 --- --- --- -- --- --- NA MW-6 07/04/90 7 97 32 35 -24 38 --- ---- --- --- --- --- NA MW-6* 10/22/90 7 97 --- --- --W-- --- --- MW-6* 01/19/91 7 97 32 58 -24 61 --- --- ---- --- --- - NA MW-6* 07/21/91 7 97 32 43 -24 46 --- --- --- --- ---- --- NA I 28-Aug-91