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i i 31-0329 Table i Summary of Results of Ground Water Sampling Chevron Service Station # 9-6465 5608 North Pershing Drive, Stockton, California Concentrations in parts per billion (ppb) mmm r saa so a s ss::rsi ss as as as a ssa w mmm a:as ss s s as a:a aaa a m ssm m w:a w rrr r rr s r r a sa sa ss wr w a asa w w:mw w a sr real r ssr s s:a r:aa s ras s a sss r alma w sa r ai WELL DATE OF CASING DEPTH GROUND TPH-G B T E X 1,2-DCA LAB ID SAMPLING/ ELEVATION TO WATER MONITORING WATER ELEVATION ommrssraa:ssswaamaasssaaaaauraarammmmaasaaaasraaasaaasaaasaesamararsraaa:aaaaaaasawwmssmmammaaaaasarmssssrsas::aassaw:rwww MW-4 02/04/88 7.75 26.78 -19 03 ND<1000 1.8 0.6 ND<0.5 ND<0.5 --- B 6 C MW-4 06/14/89 7.75 27.87 -20.12 ND<1000 ND<0.5 ND<O.5 ND<0.5 ND<0.5 --- B 6 C MW-4 09/14/88 7.75 29.57 -21.82 150 2.8 ND<1 ND<1 ND<l ND<O.1 CCAS MW-4 12/16/88 7.75 30.81 -23.06 330 1 ND<1 ND<1 ND<1 ND<0.1 CCAS MW-4D 12/16/88 7.75 30.81 -23.06 200 0.9 ND<1 ND<1 ND<1 ND<0.1 CCAS MW-4 03/23/89 7.75 30.81 -23.06 ND<500 ND<0.5 NIK0.5 ND<0.5 ND<0.5 --- SAL MW-4 07/19/89 7.75 32.63 -24.88 ND<500 98 0.8 ND<0.5 10 --- SAL MW-4* 10/05/89 7.45 34.25 -26.80 --- --- --- --- --- --- NA MW-4 04/11/90 7.45 --- --- --- ND<0.3 NIX 0.3 ND<0.3 ND<0.6 --- GTEL MW-4 05/09/90 7.45 --- --- ND<50 ND<0.3 ND<0.3 ND<0.3 ND<0.6 --- GTEL MW-4 07/04/90 7.45 35.08 -27.63 ND<50 6 ND<0.3 ND<0.3 ND<0.6 --- GTEL MW-4* 10/22/90 7.45 --- --- --- --- --- --- --- --- NA MFT-4* 01/19/91 7.45 36.62 -29.17 --- --- --- --- --- --- NA MW-4* 07/21/91 7.45 36.73 -29.28 --- --- --- --- --- --- NA MW-4* 10/17/91 7.45 37.08 -29.63 --- --- --- --- --- --- NA i MW-4* 01/09/92 7.45 37.00 -29.55 --- --- --- --- --- --- 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<0.3 ND<0.3 ND<0.3 ND<0.6 --- GTEL MW-4A 08/17/90 8.10 36.67 -28.57 ND<50 ND<0.3 ND<0.3 ND<0.3 ND<0.6 --- GTEL MW-4A 10/22/90 8.10 27.20 -19.10 ND<50 Nl><0.3 ND<0.3 ND<0.3 ND<0.6 --- GTEL MW-4AD 10/22/90 8.10 27.20 -19.10 ND<50 ND<0.3 ND<0.3 ND<0.3 ND<0.6 --- 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 --- SAL MW-4A 07/21/91 8.10 38.11 -30.01 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0 5 --- SAL MFT-4A 10/17/91 8.10/ I 8.23 -30.13 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0 5 --- SAL MW-4A 01/09/92 8.10 l �'�'Y '36.56 -28.46 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 --- SAL 03-Feb-92 Page 3