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Table 1 Page 3 of 17 <br /> Groundwater Elevation and Analy mat 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 (feet,MSL) (feet) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (mg/1) <br /> ATR-2 08/30/93 1196 — 3726 067 <50 <0 5 <0 5 <0 5 <0 5 - - <br /> (cont) 10/27/93 1195 — 3727 001 <50 <0 5 <0 5 <0 5 <0 5 -- <br /> 02/18/94 1154 — 3768 041 <10 07 09 <0 3 07 -- <br /> 05/20/94 1161 — 3761 -007 <10 09 <0 3 <0 3 <0 5 -- <br /> 10/07/94 1193 — 3729 -032 <50 <0 5 <0 5 <0 5 <0 5 <br /> 12/16/94 1156 — 3766 037 <50 <0 5 <0 5 <0 5 <0 5 — <br /> 02/28/95 1160 -- 3762 -004 <50 <0 5 <0 5 <0 5 <0 5 -- - <br /> 04/25/95 1195 -- 3727 -035 <50 <0 5 <0 5 <0 5 <0 5 <br /> 07/27/95 1291 -- 3631 -096 <50 <0 5 <0 5 <0 5 <0 5 - <br /> 10/26/95 1226 -- 3696 065 <50 <0 5 <0 5 <0 5 <0 5 - -- <br /> 02/12/96 1140 — 3782 086 <50 <0 5 <0 5 <0 5 <0 5 -- <br /> 04/18/96 1190 — 3732 -050 <250 <2 5 <2 5 <2 5 <2 5 <br /> 07/18/96 1210 — 3712 -020 <50 <0 5 <0 5 <0 5 <0 5 500 <br /> 11/15/96 1270 — 3652 -060 <50 <0 5 <0 5 <0 5 <0 5 750 -- <br /> 03/14/97 P 1270 — 3652 000 <50 <0 5 <0 5 <0 5 <0 5 280 008 <br /> 06/04/97 NP 1202 — 3720 068 <50 064 <0 5 <0 5 <0 5 480 006 <br /> 08111/97 P 1233 -- 3689 -031 <50 <0 5 <0 5 <0 5 <0 5 440 <br /> 11/17/97 P 1226 -- 3696 007 <50 <0 5 <0 5 <0 5 <0 5 98 <br /> 03/30198 NP 1182 -- 3740 044 <50 <0 5 <0 5 <0 5 <0 5 18120' 1 2 <br /> 06/25/98 NP 1205 — 3717 -023 <50 <0 5 <0 5 <0 5 <0 5 109 1 6 <br /> 09/11/98 NP 1212 — 3710 -007 <50 <0 5 <0 5 <0 5 <0 5 250 1 67 <br /> 12/15/98 NP 1201 -- 3721 Oil <50 <0 5 <0 5 <0 5 <0 5 <5 0 15 <br /> 03/17/99 NP 1165 — 3757 036 <50 <0 5 <0 5 <0 5 <0 5 <5 0 23 <br /> 05/14/99 NP 12 05 -- 3717 -040 <50 <0 5 <0 5 <0 5 <0 5 <5 0 190 <br /> 09/16/99 NP 1223 -- 3699 -018 <50 <0 5 <0 5 <0 5 <0 5 <5 0 37 <br /> 12/22/99 NP 1214 — 3708 009 <50 <0 5 <0 5 <0 5 <0 5 <2 50 743 <br /> 02129/00 NP 1150 -- 3772 064 <50 <0 5 <0 5 <0 5 <0 5 483 51 <br /> 06107/00 NP 1211 -- 3711 -061 <50 <0 500 <0 500 <0 500 <0 500 126 -- <br /> ATR-3 04/23/87 4993 1179 -- 3814 -- 17 000 2,300 180 <5 0 2,300 -- - <br /> 12/22/87 Ill 93 -- 3800 -014 -- 5,000 50 530 250 -- - <br /> 03/24/88 1258 — 3735 -065 43,000 8,300 8 700 4,400 7 800 - - <br /> 06/23/88 1117 — 3876 141 70,000 6,160 4,221 1,800 4,750 — <br /> 09/29/88 1223 -- 3770 -106 57,400 8 850 17,600 2,190 8 170 -- -- <br /> 02/22/89 1182 -- 3811 041 110,000 1 000 2,100 480 2000 - <br /> 06129189 — -- -- -- 4,500 890 520 250 1100 - <br />