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0 i Table 1 Summary of Results of Ground Water Sampling Chevron Service Station t# 9-6465 5608 North Pershing Drive, Stockton, California Concentrations in parts per billion (ppb) WELL DATE OF CASING DEPTH GROUND TPH-G 8 T E X 1 ,2-DCA LAS ID SAMPLING/ ELEVATION TO WATER MONITORING WATER ELEVATION MW--3 02/04/88 8 49 27 59 -19 10 ND(1000 ND<O 5 ND<O 5 ND<O 5 ND(0 5 --- B & C MW-3 06/28/88 8 49 26 66 -20 17 ND<1000 ND<O 5 ND<O 5 ND<O 5 ND<O 5 --- 6 & C MW-3* 12/16/88 8 49 ---- --- ---- --- --- --- --- -- NA MW-3* 03/23/89 8 49 --- -- --- --- --- --- --- --- NA MW-3* 07/19/89 8 49 29 88 -2139 --- --- - _-- ___ --- NA MW-3* 10/05/89 8 49 29 55 -21 06 ---- --- --- - --- --- NA MW-3* 07/04/90 8 49 ---- ---- --- --- --- ---- -- --- NA MW-3* 10/22/90 8 49 --- --- --- - --- --- NA MW-3* 01/19/91 8 49 29 79 -21 30 --- --- --- -- NA MW-3* 07/21/91 8 49 29 78 -21 29 --- ---- --- --- --- --- NA MW-4 02/04/88 7 75 26 78 -19 03 ND(1000 1 8 0 6 ND<O 5, ND<O 5 --- B & C MW-4 06/14/89 7 75 27 87 -20 12 ND(1000 ND(0 5 ND<O 5 ND<O 5 ND<O 5 -- B & C MW-4 09/14/88 7 75 29 57 -21 82 150 2 8 ND<1 ND(1 ND<1 ND(0 1 CCAS MW-4 12/16/88 7 75 30 81 -23 06 330 1 ND(1 ND<1 ND<1 ND<O 1 CCAS MW-4D 12/16/88 7 75 30 81 -23 06 200 0 9 ND<1 ND<1 NO(1 ND<O 1 CCAS MW-4 03/23/89 7 75 30 81 -23 06 ND<500 ND<O 5 ND(0 5 ND(0 5 ND(0 5 --- SAL MW-4 07/19/89 7 75 32 63 -24 88 ND<500 98 0 8 ND<O 5 10 --- SAL MW-4* 10/05/89 7 45 34 25 -26 80 --- --- --- --- --- --- NA MW-4 04/11/90 7 45 --- --- --- ND(0 3 ND<O 3 ND<O 3 ND<O 6 - - GTEL MW-4 05/09/90 7 45 --- --- ND(50 ND<O 3 ND<O 3 ND<O 3 ND<O 6 --- GTEL MW-4 07/04/90 7 45 35 08 -27 63 ND(50 6 ND<O 3 ND(0 3 ND<O 6 --- GTEL MW-4* 10/22/90 7 45 --- ---- --- --- --- --- --- --- NA MW-4* 01/19/91 7 45 36 62 -29 17 --- --- --- -__ --- NA MW-4* 07/21/91 7 45 36 73 -29 28 --- --- --- --- - --- NA MW-4A 03/19/90 8 10 34 58 -26 48 --- --- --- _-_ --_ NA MW-4A 04/01/90 8 10 34 76 -26 66 --- --- --- -- - --_ NA MW-4A 04/11/90 8 10 - NA MW-4A 05/09/90 8 10 35 31 -27 21 --- ND<O 3 ND<O 3 ND<O 3 -ND(0 6 -- GTEL MW-4A 08/17/90 8 10 36 67 -28 57 ND(50 ND<O 3 ND<O 3 ND(0 3 ND<O 6 --- GTEL MW-4A 10/22/90 8 10 2-7 20 -19 10 ND<50 ND<O 3 ND<O 3 ND(0 3 ND<O 6 --- MW-4AD 10/22/90 a 10 �7GTEL • 2,7 20 -19 10 ND<50 ND<O 3 ND<O 3 ND(0 3 ND(O 6 --- GTEL MW-4A 01/19/91 8 10 37 52 -29 42 130 1 4 2 15 --- SAL MW-4AD 01/19/91 8 10 37 52 -29 42 140 2 5 2 17 --T SAL MW-4A 07/21/91 8 10 38 11 -30 01 ND<50 ND<O 5 ND<O 5 ND(0 5 ND(0 5 --- SAL 28-Aug--91