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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) raaaaaaazaasaaasazamrzaazmaamaaasmamsasasassssaaaaa:maaaaamaaaaa:aaazaaaasmzs:araaaaaz==sza::zzaaarraaassrrrsrerseaasmasaaa WELL DATE OF CASING DEPTH GROUND TPH-G B T E x 1,2-DCA LAB ID SAMPLING/ ELEVATION To WATER MONITORING RATER ELEVATION sasssssrrssrarsrrsararrrurrrarruurrrruuurraasarasrssarrs::asmssasamaraassraaasasacsaraarrrrusasauuuusrsrsmasmmm NW-5 02/04/88 7.75 26.61 -18.86 ND41000 ND<0.5 ND<0.5 ND<0.5 ND<0.5 --- 6 & C 1qW-5 06//28/88 7.72 27.65 •19.93 ND<1000 104.5 ND<O 5 ND<O 5 ND<0.5 --- B & C Moi-5 09/14/88 7.72 29.36 -21.64 50 ND<O.1 ND<1 ND<1 ND<1 ND<0.1 CGS 14W-5 12/16/88 7.72 30.66 -22.94 ND4500 ND<5 ND<10 ND00 ND<10 ND<10 CCAS MW-50 12/16/88 7.72 30.66 -22.94 100 ND<0.2 ND<2 ND<2 ND<2 -•- CCAS MW-5 03/23/89 7.72 30.70 -22.98 NO-0500 ND<0.5 ND<0.5 ND<O 5 ND<O.5 --- SAL MW-5 07/19/89 7.72 32.13 -24.41 ND<500 1 0.9 ND<0.5 1 --- SAL MW-5 10/05/89 7.50 33.42 -25.92 ND<250 ND<O 5 ND<O 5 ND<0.5 NO<0 5 --- PACE MW-5 04/11/90 7.50 --- •-• •-- ND<O 3 ND<O 3 NO<0.3 ND<O.6 --- GTEL MW-5 07/04/90 7.50 --- --- --- ND<0.3 04.3 NO<0.3 ND<0.6 --- GTEL MW-5 05/09/90 7.50 --- --- ND<50 ND<O.3 ND<O 3 ND<0.3 ND<O 6 --- GTEL MW-5 07/04/90 7.50 34.45 -26.95 ND<50 ND<O 3 ND<O 3 ND<0.3 ND<0.6 --- GTEL MW-5D 07/04/90 7.50 34.45 --- ND<50 ND<0.3 ND40.3 ND<0.3 ND<O 6 --- GTEL MW-5* 10/22/90 7.50 --- --- --- --- ... --- --- NA MW-5* 01/19/91 7.50 35.95 -28.45 --- --- •-• --- --- --- NA 14W-5* 07/21/91 7.50 36.49 -28.99 --- --- --- --- --- --- NA MW-5* 10/17/91 7.50 36.52 -29.02 --- --- --- --- --- --- NA MW-5* 01/09/92 7 50 37 04 -29.54 --- --- --- --- --- --- NA MW-5 03/19/92 7.50 34.44 -26.94 N0<50 ND<0.5 ND4.5 ND<0.5 ND<0.5 --- SAL MW-5 07/01/92 7.50 35.70 -28.20 ND<50 ND<0.5 ND<0.5 ND<O 5 ND<0.5 --• SAL MW-5A 03/19/90 7.20 --- --- --- --- --- --- --- --- NA MW-5A D4/11/90 7.20 --- --- --- ND<0.3 ND<0.3 ND<O 3 ND<0.6 --- GTEL MW-5A 05/09/90 7.20 33 76 -26.56 --- ND<0.3 ND<0.3 ND<O 3 ND<0.6 --- GTEL MW-5A 08/17/90 7.20 34.84 -27.64 ND<50 10<0.3 ND<0.3 ND<0.3 ND<0.6 --- GTEL NW-5A 10/22/90 7.20 35.36 -28.16 ND<50 0 9 1 ND<0.3 1 --- GTEL MW-5A 01/19/91 7.20 35.72 -28.52 120 0 9 3 2 11 --- SAL NW-5A 07/21/91 7.20 36.25 -29.05 ND<50 ND<0 5 ND<O 5 ND<O 5 ND<O 5 •-• SAL NW-5A 10/17/91 7.20 36.30 -29.10 N0<50 ND<0.5 ND<0 5 ND<O 5 ND<0.5 -•- SAL MW-5A 01/09/92 7.20 34,77 -27.57 ND<50 N0<0.5 ND<0.5 ND<O 5 ND4.5 --- SAL MW-5A 03/19/92 7.20 34.20 -27.00 ND<50 ND<0.5 1.3 ND<0.5 ND<0.5 --- SAL MW-5A 07/01/92 7.20 35.45 -28.25 ND<50 ND<O 5 ND<0.5 10<0.5 ND<0.5 --- SAL D6-Aug-92 Page 4