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Table 1 Groundwater Monitoring Data and Analytical Results Tosco(Unocal)Service Station#5886 2701 West March Lane Stockton,California T E x MTBE IWELL 1D/ DATE DTW ST GWE TPH-D TPR-G B b) TOC*(ft) t} t b s) (ms[) (P b) ( b) (P b) (P b) b) ( b) <50 <0 50 <0 50 <0 50 <l 0 <2 0 MW-7S 08/01-02102`0 951 7 0-17 0 -66 1 2 -- <1 0 <2 0 <50 <0 56 (cont) i 1120-2110220 932 -6 43 <0 50 <0 50-- <0 50 <1 0 <2 0 -b 23 <50 <0 50 <0 50 02120-21103'0 912 -_ -- -- 05107-08103 8 30 -5 4+l SAMPLED SEMI-ANNUALLY <0 Sfl 4 0 <Z fl -6 69 <50 <0 50 <0 50 08/04-05/03 20 9 58 _ � MW-71) ND ND ND 226 05/02/97 927 23 0-25 5 -701 ND ND ND ND 09/02/97 l 1 31 -905 ND ND ND ND ND ND ND 1ND6 ND ND ND ND ND ND 12/01/97 976 -750 NDIND7 -5 55 ND ND ND ND ND ND 03/25/98 781 ND ND ND/ND7 06/17/98 882 -656 ND' ND ND ND ND ND ND ND ND NDfNDI 09/01/98 964 -738 ND ND/3 87 12/03/98 895 -669 536 9 ND ND ND ND ND -5 68 ND ND ND ND ND ND ND/ND 03/01/99 794 276 ** 04/15/99 865 -5 89 ND/ND7 06101-02199 947 -6,71 ND ND ND ND ND ND -6 93 ND MD7 0811b-17199 9 69 ND ND ND ND ND NDNDMD7 11129-30199 957 -6 81 ND ND ND ND ND ND i ND/ND7 8 ND ND ND ND ND ND ND/ND7 02/28-29100 694 -4 05110-11100 878 -6102 ND ND ND ND ND ND I 08103-04100 941 -6165 ND ND ND ND ND ND NDMD7 4 ND 7 11116-17/00 896 -66 ND17 D 0 51 ND ND NND/ND 02105-06101 885 -6i 09 ND ND ND ND ND ND ND/ND' 05107-08!01 866 -5190 ND' ND ND ND ND ND ND/ND T < 0 50 <5 01<2 07 08120-21101 986 -7 10 <50 <50 <0 50 <0 50 0 50 < 11/19-20/01 936 -6160 -- <50 <0 50 <0 50 <0 50 <0 50 <5 DI<1 O7 02/11-12102 896 - 20 -- <50 <0 50 1 3 <0 50 097 <2 5/4 07 05102-03102 899 -623 -- <50 <0 50 <0 50 <0 50 <0 50 „ <5 0/<2 O7 08101-0210220 942 -6 66 -- <50 <0 50 <0 50 <0 50 <1 0 <2 0 <50 <0 50 <0 50 <0 50 <1 0 <2 0 11/20-21/0220 691 -4 15 -- As*I05103 5886 xi037