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31-0329 Table 1 Summary of Results of Ground water Sampling Chevron Service Station No 9-6465 5608 North Pershing Avenue, Stockton, California Concentrations in parts Per billion (ppb) xasssaaxaxxsassassaaasaaaaxxxxxxssasasaaxxxxsss:ss==assasxxaxxxaasssaaaaas=a3ssxassssssaa====ssaxxxxxxxssassass_ra=ooxnees WELL DATE OF CASING DEPTH GROUND TPH-G B T E x 1,2-DCA LAB ID SAMPLING/ ELEVATION TO WATER MONITORING WATER ELEVATION axaxssaraaarssasaeapxcsasaaexxxxaaaazssaaas::asssssssasaaassaaxaasxasaasassaa:aa::aseesssassscssaaaaassxxxxxxaaaxzasaza:axa MW-4 02/04/88 7.75 26 78 -19.03 ND<1000 1 8 0.6 ND<O 5 ND<0 5 --- B & C MW-4 06/14/89 7.75 27 87 -20 12 ND<1000 ND<0 5 ND<0.5 ND<0.5 ND<0 5 --- B & C Mw-4 09/14/88 7 75 29 57 -21 82 150 2.8 ND<1 N00 ND<1 ND<O.1 CCAS MW-4 12/16/88 7 75 30.81 -23 06 330 1 ND<l ND<l ND<1 ND<0.1 CCAS MW-4D 12/16/88 7.75 30.81 -23 06 200 0.9 ND0 ND<l ND<1 ND<0 1 CCAS MW-4 03/23/89 7 75 30.81 -23.06 ND<500 ND<0 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<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 ND<0 3 ND<0.3 ND<0 6 --- GTEL MW-4 05/09/90 7.45 --- --- ND<50 ND<0.3 ND<O 3 ND<O 3 ND<0 6 --- GTEL MW-4 07/04/90 7.45 35 08 -27 63 ND<50 6 ND<0.3 IID<0.3 ND4.6 --- 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-4* 10/17/91 7.45 37.08 -29.63 --- --- --- --- --- --- NA MW-4* 01/09/92 7 45 37.00 -29.55 --- --- --- --- --- ... NA MW-4 03/19/92 7.45 35.20 -27.75 ND<50 MD<0.5 0.7 ND<0.5 ND<0.5 --- SAL MW-4# 07/01/92 7.45 --- ... --- --- --- --- --- ... NA Mw-4+ 09/16/92 7 45 --- --- --- --- --- --- --- --- 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/D9/90 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<o 3 ND<0.3 ND<0.3 ND<0.6 --- GTEL MW-4A 10/22/90 8.10 27.20 -19 10 ND<50 ND<0 3 ND<0.3 ND-<0.3 N0<0.6 --- GTEL MW-4AD 10/22/90 8 10 27.20 -19 10 ND<50 ND<0 3 ND<0 3 ND<O 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<O 5 ND<O 5 ND<0 5 --- SAL MW-4A 10/17/91 8.10 38.23 -30.13 ND<50 ND<0.5 ND<0 5 ND<O 5 ND<0.5 --- SAL MW-4A 01/09/92 8.10 36.56 -28.46 N0<50 ND<0 5 ND<0 5 ND<D 5 ND<0 5 --- SAL MW-4A 03/19/92 8 10 35 88 -27 78 ND<50 ND<0 5 ND<0 5 ND<0 5 ND<O 5 --- SAL MW-4A 07/01/92 8 10 37 52 -29 42 ND<50 ND<O 5 ND<0 5 ND<0 5 ND<O 5 --- SAL MW-4A 09/16/92 8 10 39 06 -30 96 ND<50 ND<0.5 ND<0 5 ND<0.5 ND<0 5 --- SAL MW-4A# 01/05/93 8.10 --- --- --- --- --- --- --- --- NA 29-Jan-93 Page 3