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To P.0 of 17 <br /> Groundwater Elevation and Analytical Data <br /> ARCO Service Station#2093 <br /> 3425 Tracy Blvd,Tracy,California <br /> Floating <br /> Well Depth product Groundwater Groundwater Total <br /> Date ElevatIon to Water thickness Elevation Elevation Change TPN-G Benzene Toluene Ethylbenzene Xylenes MTBE DO <br /> Sampled (feet,MSL) (feet,TOC) in feet (feet,MSL) (feet) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (mgll) <br /> 12/16/94 821 Sheen 3777 039 - - - - <br /> 02/28/95 845 002 3754 023 — - - <br /> 04/26/95 851 050 3782 028 - - — -- - <br /> 07/27/95 965 012 3621 -1 61 — — -- - - <br /> 10/26/95 928 003 3672 051 - — -- - — <br /> 02/12/96 787 002 3812 140 - - -- - <br /> 04/18/96 845 002 3754 -058 — -- ~ -- -- -- <br /> 07/18/96 895 — 3703 -051 88,000 72 220 620 2,500 <500 - <br /> 11/15/96 940 — 3658 -045 52,000 110 130 240 1,300 <200 - <br /> 03/14/97 924 — 3674 016 350 42 <0 5 16 26 <2 5 010 <br /> 06/04/97 NP 869 — 3729 055 1200 42 52 82 150 <2 5 003 <br /> 08111/97 NP 910 — 3688 -041 7,800 280 75 140 710 <25 -- <br /> 11/17/97 NP — — -- -- 4,200 57 <0 5 <0 5 250 <2 5 -- <br /> 03/30/98 NP 802 — 3796 -- 320 1 7 <0 5 <0 5 24 <5 01<2 0' 080 <br /> 06/25/98 NP 969 — 3629 -1 67 876 300 1 90 871 176 <5 0 140 <br /> 09/11/98 Well Paved Over -- — -- - -- -- -- <br /> 12/15/98 NP 4611 886 — 3725 -- 456 102 0 690 612 809 <5 0 070 <br /> 03/17/99 NP 855 — 3756 -031 130 212 0 528 212 271 <5 0 250 <br /> 05/14/99 NP 881 -- 3730 026 155 1 79 <0 5 241 200 <5 0 420 <br /> 09/16/99 NP 917 — 3694 036 747 278 142 988 840 <50 1 80 <br /> 12/22/99 NP 799 -- 3812 -1 18 648 <0 5 0 586 585 536 <2 50 031 <br /> 02/29/00 NP 818 -- 3793 -019 142 160 <0 5 239 1 36 <2 50 620 <br /> 06107100 NP 902 — 3709 -084 576 482 <0 500 843 <2 50 <12 5 -- <br /> ATR-9 10/16/90 4868 — -- — -- <50 <0 5 <0 5 <0 5 <0 5 -- - <br /> 10/19/90 11 11 — 3757 — -- -- -- -- -- - - <br /> 01/10/91 1104 -- 3764 007 <50 <0 5 <0 5 <0 5 <0 5 <br /> 04/10/91 1082 — 3786 022 <50 <0 5 <0 5 <0 5 <0 5 - - <br /> 07/10/91 11 06 — 3762 -024 <50 <0 5 <0 5 <0 5 <0 5 - - <br /> 09/24/91 11 29 — 3739 -023 -- — -- -- -- <br /> 09/25/91 -- — — -- <50 <0 5 <0 5 <0 5 <0 5 -- -- <br /> 01/23/92 1096 — 3772 -- <50 <0 5 <0 5 <0 5 <0 5 -- - <br /> 04/20/92 1088 -- 3780 008 -- — — -- -- ~ - <br /> 04/21/92 — — — -- <50 <0 5 <0 5 <0 5 <0 5 -- <br /> 07/08/92 11 06 — 3762 -- <50 <0 5 <0 5 <0 5 <0 5 - — <br /> ATR-9 10/07/92 1116 — 3752 -010 <50 <0 5 <0 5 <0 5 <0 5 <br /> (cont) 01118193 1034 — 3834 082 <50 <0 5 <0 5 <0 5 <0 5 - - <br /> 04/14/93 1070 — 3798 -036 <50 <0 5 <0 5 <0 5 <0 5 - <br />