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! i Table 1 Page 8 of 16 Groundwater Elevation and Analytical Data ARCO Service Station#2093 3425 Tracy Blvd,Tracy,California Floahng Well Depth product Groundwater Groundwater Total Date Elevation to Water thickness Elevation Elevation Change TPI-Ig Benzene Toluene Ethylbenzene Xylenes MTBE DO Sampled (feet MSL) (feet,TOC) in feet (feet,MSL) ((feet) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (mg/1) 06/04/97 NP 10 26 97 2 7 <0 5 <0 5 <0 5 <2 5 017 ATR 5 08/11/97 NP 1044 220 34 0 6 <0 5 <0 5 6 9 (conk) 11/17/97 NP 10 50 190 2 8 065 <0 5 <0 5 51 - 03/30/98 NP 9 81 88 <0 5 <0 5 <0 5 <0 5 6 2 2 1 06/25/98 NP 10 11 <50 <0 5 <0 5 <0 5 <0 5 9 11 1 5 09/11/98 Welllnaccessable - -- - - -- - -- 12/15/98 NP 1020 134 <0 5 <0 5 <0 5 <0 5 8 98 1 7 03/17/99 NP 981 756 0 586 <0 5 0 876 102 <5 0 7 4 05/14/99 NP 10 34 <50 <0 5 <0 5 <0 5 <0 5 <5 8 5 09/16/99 NP 10 40 <50 <0 5 <0 5 <0 5 <0 5 512 2 2 12/22/99 NP 1030 - <50 <0 5 <0 5 <0 5 <0 5 <2 50 635 02/29/00 NP 970 -- - <50 <0 5 <0 5 <0 5 <0 5 306 2 9 06/07/00 Well Inaccessible — — -- -- -- — -- 09/25/00 NP 1057 38 16 - <50 <0 5 <0 5 <0 5 <0 5 <2 50 040 12/29/00 P 1019 3854 038 136 128 <0 500 <0 500 0 656 <2 00' 51 ATR 6 03/10/89 4935 -- - <200 <0 5 <0 5 <0 5 <0 5 06/21/89 1154 3781 -- <50 <0 3 <0 3 <0 3 0 3 - 09/18/89 11 60 3775 -006 <50 0 5 13 03 3 8 - 12/27/89 11 57 3778 003 <50 <0 3 <0 3 <0 3 0 4 04!18190 11 68 37 67 -0 11 <50 19 24 06 5 10/16/90 -- <50 <0 5 <0 5 <0 5 <0 5 10/19/90 11 80 3755 - -- -- - 01/10/91 11 64 3771 0 16 <50 <0 5 <0 5 <0 5 <0 5 04/10/91 11 52 3783 0 12 <50 <0 5 <0 5 <0 5 <0 5 07/10/91 11 76 3759 024 <50 <0 5 <0 5 <0 5 <0 5 09/24/91 1195 3740 019 <50 <0 5 <0 5 <0 5 <0 5 01/23/92 1166 3769 029 <50 <0 5 <0 5 <0 5 <0 5 - 04/20/92 11 56 3779 010 -- 04121/92 -04121/92 - -- -- <50 <0 5 <0 5 <0 5 <0 5 07/08/92 11 72 3763 <50 <0 5 <0 5 <0 5 <0 5