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Tal Pleof 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 Bevation Elevabon 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 3 04/23/87 4993 1179 -- 3814 -- 17,000 2,300 180 <5 0 2,300 12/22/87 1193 - 3800 014 -- 5,000 50 530 250 03/24/88 1258 -- 3735 065 43,000 8,300 8 700 4,400 7 800 06/23/88 1117 3876 141 70,000 6,160 4,221 1,600 4,750 09/29/88 1223 3770 106 57,400 8,850 17,600 2 190 8 170 -- 02/22/89 1182 3811 041 110,000 1,000 2,100 480 2000 06/29/89 -- -- -- -- 4,500 890 520 250 1,100 -- 09/18/89 1219 3774 -- 7,400 1 000 1 300 460 2200 12/28/89 1201 -- 3792 018 27,000 840 1 400 840 5 600 04/18/90 1215 -- 3778 014 4,800 1,000 490 340 1500 -- 10/16/90 1235 -- 3758 020 14 000 1,900 1,300 760 4,600 -- - 10/19/90 1228 -- 3765 007 -- -- -- -- - -- 01/10/91 1201 -- 3792 027 2,600 610 230 160 670 04/10/91 1182 -- 3811 019 3,000 910 120 110 190 07/10/91 U 23 3770 041 19,000 420 300 340 760 09/24/91 1267 - 3736 034 2,000 280 81 69 130 01/23/92 1212 Sheen 3781 046 -- - -- - -- - 04/20/92 1193 Sheen 3800 019 - -- 07/08/92 1222 Sheen 37 71 029 - 10/07/92 1238 Sheen 3755 016 01/18/93 1122 Sheen 3871 1 16 - 04/14/93 1149 Sheen 3844 027 - - -- 08/30/93 1243 Sheen 3750 094 10/27/93 1239 Sheen 3754 004 -- -- -- - - 02/18/94 1200 - 3793 039 1,900 200 27 120 140 05/20/94 1207 Sheen 3786 007 -- -- -- - - - 10/07/94 1238 Sheen 3755 031 12/16/94 1203 Sheen 3790 035 -- - - 02/28/95 1206 003 3790 000 04/26/95 1232 Sheen 3761 -029 07/27/95 1261 -- 3742 -019 -- - 10/26/95 (o) 1297 -- -- -- -- -- -- _- 02/12/96 1210 - -- - 1,500 89 <0 5 43 150 - 04/18/96 1260 -- -- -- -- -- -- - - 07/18/96 1260 - -- -- 1,600 26 52 70 51 1,800 11/15/96 1340 -- -- -- -- - - - - 03/14/97 NP 1334 -- - 1200 10 <0 6 43 19 620 005