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Table i Page 7 of 18 Groundwater Elevation and Analytical Data ARCO Service Station#2093 3425 Tracy Blvd,Tracy,California Floating Well Depth product Groundwater Groundwater Total Date Elevation to Water thickness Elevation Elevation Change TPHg Benzene Toluene Ethylbenzene Xylenes MTBE DO Sampled (feet MSL) (feet TOC) in feet (feet,MSL) (feet) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (mgll) ATR 5 03/10/89 4873 - -- -- 6,600 693 <5 0 327 7 - 06/29/89 1052 3B 21 2,200 490 24 280 13 09/18/89 1098 3775 046 1,000 68 1 1 63 58 12/27/89 1076 3797 022 2,200 94 2 150 <1 04/18/90 1090 3783 -0 14 1,900 120 26 68 140 10/16/90 - - 1,000 18 47 79 16 10/19/90 11 10 3763 - - -- - - 01/10l91 1084 3789 026 350 71 12 16 26 04/10/91 1067 3806 017 370 46 <0 5 7 <0 5 07/10/91 11 02 3771 035 1,200 95 <0 5 18 1 5 09124/91 11 29 3744 -027 <50 <0 5 <0 5 <0 5 <0 5 01/23/92 10 78 3795 051 180 14 15 15 <0 5 04/20/92 1070 3803 008 - -- 04121192 - - 290 16 <0 5 2 <0 5 07/08/92 1097 3776 240 <0 5 <0 5 06 <0 5 10/07/92 11 11 3762 0 14 -- -- -- - 10108/92 - -- - 160 <0 5 <0 5 <0 5 <0 5 01/18/93 9 94 3879 - 01/19/93 - -- - 1,000 25 <0 5 79 13 04/14/93 1047 3B 26 -- -- 04/15193 - - 810 15 <0 5 83 09 08/3il93 11 16 3757 - 80 <0 5 <0 5 <0 5 <0 5 - 10/27/93 11 11 3762 005 63 <0 5 <0 5 <0 5 <0 5 - -- 02/18/94 1073 3800 038 160 3 5 1 4 - 05/20/94 1082 3791 009 600 <0 3 2 1 2 17 10/07/94 11 14 3759 032 660 <0 5 <0 5 <0 5 <0 5 12/16/94 1077 3796 037 410 65 <0 5 <0 5 <0 5 02/28/95 1080 3793 -003 60 <0 5 06 <0 5 <0 5 04/26/95 11 04 3769 -024 83 <0 5 <0 5 <0 5 <0 5 07/27/95 11 27 3746 -023 58 <0 5 <0 5 <0 5 1 2 10/26/95 (c) 1051 - - - -- - -- - 10/27/95 - <520 <5 <0 5 <0 5 <0 5 02/12196 960 92 1 <0 5 <0 5 <0 5 04/18/96 806 60 <0 5 <0 5 <0 5 <0 5 07/18/96 10 11 - 280 48 <0 5 <0 5 <0 5 14 11/15/96 - - -- -- -- -- -- - 03l14/97 1094 -- <50 <0 5 <0 5 <0 5 <0 5 <2 5 0 15 I