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Groundwater Monitoring Data and Analytical Results _ Tosco (Unocal) Service Station#5886 b 2701 West March Lane Stockton, California rWeOC It IDl Date DTW GWE TPH(D) TPH(G) B T D X * (ft) {ms1) (Ppb) (ppb) (pph) {ppb) (Ppb) (ppb) MTBE (PPS) MW-1 -084 09/06/96 745 -829 -- 09/09/96 758 -842 611 ND ND ND ND ND 230 12/06/96 645 -729 74 ND ND ND ND ND 90 03/07/97 5 83 -667 ND ND ND ND ND ND 110 -135 05/02/97 624 -759 ND ND ND ND ND 09/02/97 828 -963 ND ND ND 140 ND ND ND ND 530 12/01/97 673 -808 ND6 ND ND ND ND ND 03/25/98 S 13 -648 ND6 40 ND ND ND ND ND 661697 06/17/98 5 94 -729 NO ND ND ND ND ND ND/ND7 09/01/98 658 -793 ND ND ND ND ND ND ND/ND7 12/03/98 6 13 -748 ND6 ND ND ND ND ND 130/1107 03/01/99 534 -669 ND ND ND ND ND ND 52015307 -084 ** 04/15/99 589 -673 06/01-02199 634 -7 18 ND ND ND ND ND ND 230/29{)' 08116-17199 668 -7 52 ND ND ND ND ND ND 64/807 11/29-30199 658 -742 1252/536,12 ND ND ND ND ND 33145' MW-2 -030 09/06/96 8 13 -843 -- 09/09/96 822 -852 542 ND ND ND ND ND - 12/06/96 674 -704 64 ND 1,800 ND ND ND 60 6,100 03/07/97 590 -620 ND ND ND ND ND ND -081 05/02/97 649 -730 534 6,700 ND 4 3 ND ND ND 6,400 '4 09/02/97 8 64 -945 ND ND ND ND ND NO 3600 12/01/97 703 -784 ND6 ND' ND8 ND8 NOND 4,40, 07 03/25/98 5 16 ,6D0 -5 97 ND6 NO ND8 3 1 ND' 29 1,70011,6007 06/17/98 599 -680 ND6 NO ND8 ND8 09/01/98 6 81 NDs ND8 2,50012,1007 -7 62 ND ND ND ND ND ND 2,60012,9007 12/03/98 628 -709 ND6 s 8 03/0I/99 5 23 ND ND ND ND' ND8 4,800/4,g007 6 04 NDs -0 30 04/15/99 5 98 -628 9,300 57 470 410 1,500 71013,7007 ' ** -- 06/01-02199 670 -700 ND ND NO NO NDs -- 08116-17199 701 ND8 2,600!2,9007 -7 31 ND ND' ND8 NO NO ND' 10,000113,0007 11129-30/99 685 -715 12 ND ND8 NDS ND8 NDB e ND 27,000/32,000 � 5886 xls/k180137 1 As of 11/30/99