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Table 1 I Groundwater Monitoring Data and Analytical Results Former Tosco(Unocal)Service Station#6981 4707 Pacific Avenue Stockton,California E WELL ID/ DATE DTW SI GWE TPH-G B T E I X MTB19 1 bC*(ft) (ft) (ft bgs) (ft) fppb) (ppb) ppo (ppb) (ppp) (ppb) I. VW-3 12/08/97 3575 25 5-50 5 -- -- - - -- -- - (cant) 03/05/98 3120 -- <50 <0 50 <0 50 <0 50 I <0 50 3401300 05/27/98 2796 - <50 <0 50 <0 50 <0 50 <0 50 <2 5/<2 0" 07/21/98 2807 -- <50 <0 50 1 7 <0 50 1 6 <5 01<2 0" 10/14/98 2910 -- <50 <0 50 <0 50 <0 50 <0 50 <2 5/<2 0" 01125-26199 2828 -- <1,000 <10 <10 <10 <10 1,300/1,300 04/19-20/99 2575 <50 <0 50 <0 50 <0 50 <0 50 7801890" 07/I5-16199 27 18 <500 <5 0 <5 0 <5 0 <5 0 2,90014,900 10125-26/99 2885 -- <250 23 <2 5 <2 5 <2 5 1,1001850" 01127-28100 2839 -- <50 060 <0 50 <0 50 I <0 50 2,400/2,500 06126-27100 2558 -- <50 0 <0 500 0 561 <0 500 1 <0 500 279/384 1132 09122-23100 2800 -1668 <50 <0 50 <0 50 <0 50 ! <0'50 3,20012,400 12126-27100 2796 -1664 <50 0 <0 500 <0 500 <0 500 <0 500 116/10 4" 03/07-08101 2768 -1636 <50 0 <0 500 <0 500 <0 500 <0 500 <5 0013 33' 06126-27/01 2859 -1727 <50 <0 50 <0 50 <0 50 1 <0 50 27/416 09112-13101 3057 -1925 <50 <0 50 <0 50 <0 50 I <0 50 <5 014 5" 12112-13101 3085 -1953 <50 <0 50 <0 50 <0 50 <0 50 <5 0/<1 0" 03120-21102 2963 -1831 <50 <4 50 <0 50 <0 50 <0 50 <5 01<2 0 I � I VW-4 ` NA 07/24/96 DRY 25 5-50 5 -- -- -- - "" -" 10/23/96 -- - SAMPLED SEMI-ANNUALLY -- 01/21/97 3607 -- 3,000 <0 5 53 31 530 <5 0 07/17/97 3413 -- 670 <0 5 45 61 I 98 5 1 10/15/97 DRY 12/08/97 WELL CONNECTED TO VES 03/05198 31 82 -- <50 <0 50 <0 50 <0 50 1 <0150 35/39" 05/27/98 2855 -- 3,900 <l0 <10 <10 <10 <101<5 0" 07/21/98 2853 -- 2,5009 97 <0 50 <0 50 57 <5 0/<2 0 I0/14/98 2954 -- 14,0009 <50 <50 120 370 <2501<66" 01/25-26199 2974 -- 20,00012 <50 100 <50 ; 440 <250/15' I AS/21102 6981 JR0138