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STas Pao&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 TPH-G Benzene Toluene Ethylbenzene Xylenes MTBE DO <br /> Sampled (feet,MSL) (feet,TOC) in feet Meet,MSL) (feet) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (mgll) <br /> ATR-1 03/14/97 NP 1368 - 36 90 006 <50 <0 5 <0 5 <0 5 <0 5 - 0 30 <br /> (cont) 06/04/97 1304 - 37 54 064 -- -- -- -- - 022 <br /> 08/11/97 NP 1343 - 3715 -039 <50 <0 5 <0 5 <0 5 <0 5 23 -- <br /> 11/17/97 1329 - 3729 014 -- -- -- -- -- -- <br /> 03130/98 NP 1258 - 3800 0 71 <50 <0 5 <05 <0 5 <0 5 <50 200 <br /> 06/25/98 1356 - 3702 -0 98 -- -- -- -- -- -- - <br /> 09/11/98 NP 1320 - 3738 036 <50 <0 5 <05 <0 5 <05 <25 104 <br /> 12!15198 1302 - 3756 018 -- - -- -- -- 1 30 <br /> 03/17/99 NP 1279 - 3779 023 <50 <05 <05 <05 <05 <5 0 51G <br /> 05114!99 1306 - 37 52 -027 -- -- - -- -- -- 220 <br /> 09/16/99 NP 1336 - 37 22 -030 <50 <05 <0 5 <0 5 <0 5 <50 330 <br /> 12!22199 1319 - 3739 0 17 -- -- -- -- - -- 1 77 <br /> 02/29/00 NP 1246 - 38 13 074 <60 <0 5 <0 5 <0 5 <0 5 <2 5 490 <br /> ATR-2 04/23/87 4922 11 28 - 3794 -- <100 <0 5 0 6 <0 5 <0 5 -- -- <br /> 12r22187 1140 - 3782 -012 -- <0 5 <0 5 <05 <0 5 - <br /> 03/24/88 11 35 - 3787 005 - <0 5 <0 5 <05 <0 5 <br /> 06/23/88 11 55 - 3767 -020 - <0 5 <0 5 <05 <0 5 <br /> 09129188 1171 - 3751 -016 -- <0 5 <0 5 <05 <0 5 <br /> 02/22189 11 35 - 3787 036 370 1 8 0 7 06 34 - <br /> 06121/89 1145 - 3777 -010 <50 1 9 <0 3 0 4 <0 3 <br /> 09/18/89 1165 - 37 57 -020 9 1 9 0 9 1 1 8 2 <br /> 12/27/89 1150 - 3772 015 <50 3 5 <0 3 1 1 0 3 <br /> 04/18/90 1164 - 3758 -014 50 2 9 <0 3 <0 3 <0 3 -- - <br /> 10/16/90 1181 -- 3741 -017 <50 <0 5 <0 5 <0 5 <0 5 - <br /> 10/19/90 1181 - 37 41 000 -- -- -- -- -- <br /> 01110/91 1158 - 3764 023 <50 0 8 <0 5 <05 <0 5 <br /> 04110/91 1135 - 3787 023 <50 <05 <0 5 <05 -05 <br /> 07/10/91 1174 - 3748 -039 <50 <05 <05 <05 <0 5 <br /> 09/24/91 1202 - 3720 -028 <50 <0 5 <05 <05 <0 5 - <br /> 01l23192 1160 - 3762 042 <50 <05 <05 <0 5 <0 5 - <br /> 04!20192 1153 - 3769 007 <50 <05 <05 <0 5 <0 5 - <br /> 07/08192 1175 — 37 47 -022 <50 2 8 <0 5 <0 5 <05 - <br /> 10/07/92 1183 -- 3739 -008 59 5 7 <05 <05 <05 - <br /> 1118193 -- — — -- -- -- -- -- -- — — <br /> 04114/93 1129 — 3793 -- 55 3 8 0 7 08 1 9 <br /> 08/30193 1196 — 3726 -067 <50 <0 5 <0 5 <0 5 <0 5 — <br />