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Table 1 Groundwater Monitoring Data and Analytical Results Tosco(Unocal)Service Station#5886 2701 West March Lane Stockton,California i WELL IDI DATE DTW S.I GWE TPH-D TPH-G B T E X MTBE TOC*(ft) (It) (/t bgs) (msl) (Ppb) (Ppb) (Ppb) (Ppb) (Ppb) (Ppb) (PPb) ::] MW-4S 12!03/98 706 50-150 -7 31 ND' ND ND ND ND ND 4 115 4'3 9/3 1' (cont) 03/01/99 604 -629 NO ND ND ND ND ND - 045 ** 04/19/99 677 -632 -- -- 4 015 3' -6 97 ND ND ND ND ND ND l 06101-02199 7 42 4 314 8 08116-17/99 775 -730 ND ND ND ND ND ND _7 15 ND ND ND 25 ND, 20 12!13' ` 11129-30/99 760 3 714 5' f 02128-29/00 501 -456 ND ND M7 ND ND ND 05/10-11/00 673 -628 ND ND ND ND ND ND 5 1715727 08103-04100 757 -712 ND ND ND ND ND ND ND/3 20' -6 53 ND" ND ND ND ND ND 5 413 5T 11116-17!00 6 98 ND/3 77 02/05-06101 684 -639 ND ND ND ND ND ND 2 89' 04/30/01 670 -625 -- -- -6 29 NDS ND ND ND ND ND ND/3 25 05107-08101 6 74 <5 0 06/27/01 744 -6 99 -- '- - -- -- -- 98 07/19/01 732 -687 -- -- <5 012 5' 08120-21101 768 -723 <50 <50 <0 50 <0 50 <0 50 <0 50 09/13/01 762 -717 -- -- -- -- -- -- <5 0 10119101 7 65 -7 20 -- - -- -- -- <5 0 7 11119-20/01 7 24 -6 79 - <50 <0 50 <0 50 <0 50 <0 50 <5 0/1 1 --/<2 5' 12/13/01 694 -649 -- -- _= -- <2 5 01/18/02 650 -605 -- 02/11-12/02 699 -654 - <50 <0 50 <0 50 <0 50 <0 50 <2 5/<2 0' -6 36 -- -- -- -- -- 43 03/21/02 6 81 7 05102-03102 696 -651 -- <50 <0 50 <0 50 <0 50 <0 50 <5 01<2 0 08/01-0210220 728 -683 -- <50 <0 50 <0 50 <0 50 <10 47 11/20-211022" 7.17 -6.72 -- <50 <0.50 <0 50 <0 50 <10 23 I I � MW-5D i 0 18 05/02/97 7 38 20 5-24 0 -7 20 9W ND ND ND ND ND ND 09/02/97 960 -942 ND ND ND ND ND ND ND - 12/01/97 797 -779 ND ND ND ND ND ND ND 5886 x1*137 0 0 A0121102