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Table 1 Page 4 of 18
<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 TPHg Benzene Toluene Ethylbenzene Xylenes MTBE DO
<br /> Sampled (feet MSL) (feet TOC) in feet (feet MSL) (feet) (ppb) (ppb) (ppb) (ppb) (ppb) �ePb7_ (mgll)
<br /> ATR 3 04/23/87 4993 1179 3814 -- 17,000 2,300 180 <5 0 2,300 --
<br /> 12/22/87 1193 3800 -014 -- 5,000 50 530 250 - --
<br /> 03/24/88 12 58 37 35 -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 11 82 38 11 0 41 110 000 1,000 2,100 480 2,000 -
<br /> 06/29/89 - - 4,500 890 520 250 1,100
<br /> 09/18!89 1219 3774 - 7,400 1,000 1,300 460 2,200
<br /> 12/28/89 1201 37 92 0 18 27,000 840 1,400 840 5,600
<br /> 04/18190 12 15 3778 0 14 4,800 1,000 490 340 1,500 --10/16/90 1235 -- 3758 -020 14,000 1,900 1,300 780 4,600 - -
<br /> 10/19/90 1228 3765 007 -- -- -- -- --
<br /> 01/10/91 1201 3792 027 2,600 610 230 160 670
<br /> 04/10/91 1182 3811 019 3,000 910 120 110 190
<br /> 07/10/91 1223 3770 -0 41 19,000 420 300 340 760
<br /> 09/24/91 12 57 37 36 -034 2,000 280 81 69 130
<br /> 01/23/92 1212 Sheen 3781 045 - -- --
<br /> 04/20/92 11 93 Sheen 3800 0 19 - - - -
<br /> 07/08/92 1222 Sheen 3771 -029 - --
<br /> 10/07/92 1238 Sheen 3755 -0 16
<br /> 01/18/93 11 22 Sheen 3871 1 16 - -- -
<br /> 04/14193 11 49 Sheen 3844 027 -- -- -- --
<br /> 08/30/93 12 43 Sheen 3750 094 -- -- -
<br /> 10/27/93 1239 Sheen 3754 004 -- -- -- --
<br /> 02118194 1200 3793 039 1,900 200 27 120 140 - --
<br /> 05/20/94 1207 Sheen 3786 -007 -- -- -- -- --
<br /> 10/07/94 1238 Sheen 3755 031 -- - --
<br /> 12/16/94 1203 Sheen 3790 035 -- -- - -
<br /> 02/28/95 1205 003 37 90 000 --
<br /> 04/26/95 1232 Sheen 3761 -029 -- - -- - - -
<br /> 07/27/95 1251 37 42 -0 19 -- -- - --
<br /> 10/26/95 (c) 1297 - -- --
<br /> 02/12/96 12 10 1,500 89 <0 5 43 150
<br /> 04/18/96 1260 -- -- -- --
<br /> 07/18/96 1260 1,600 26 52 70 51 1,800 --
<br /> 11/15/96 1340 -- -- -- --
<br /> 03/14197 ISP 1334 - 1,200 10 <0 5 43 19 620 005
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