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I <br /> TAD *of 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 (feet,MSL) (feet) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (mg/1) <br /> ATR-3 12/22/99 1276 — 37 17 003 - -- -- -- -- — 037 <br /> (cont) 02/29/00 NP 1210 — 3783 066 405 235 <1 00 515 1 18 2,160 36 <br /> 06107100 NP 1281 — 3712 -071 -- -- -- -- -- <br /> ATR-4 04/23/87 4903 1085 — 3818 — 21 000 3,000 200 <10 950 -- <br /> 12/22/87 1100 — 3803 -015 -- 5,300 310 430 270 - <br /> 03/24/88 1098 — 3805 002 6,000 5,800 320 930 740 - <br /> 06/23/88 1211 -- 3692 -1 13 5200 237 88 2 10 - <br /> 09/29/88 1072 — 3831 139 1 400 1,430 115 350 130 - <br /> 02/22/89 1091 — 3812 -019 22,000 1 300 82 54 170 -- <br /> 06/29/89 11 00 — 3803 -009 1,300 590 38 97 220 - <br /> 09/18/89 11 19 -- 3784 -019 630 280 13 49 100 - <br /> 12/28189 11 08 — 3795 Oil 1,300 500 25 56 160 — - <br /> 04/18/90 1125 — 3778 -017 440 150 51 35 63 -- <br /> 10/16/90 11 38 — 3765 -013 380 26 41 48 038 — -- <br /> 01/10/91 11 16 — 3787 022 330 150 31 30 35 - -- <br /> 04/10/91 1099 — 3804 017 500 84 <0 5 <0 5 24 - <br /> 07/10/91 11 32 — 3771 -033 190 39 <0 5 37 3 — <br /> 09/24/91 1157' — 3746 -025 70 22 <05 42 1 5 <br /> 01/23/92 11 16 -- 3787 041 1,200 300 52 49 72 - <br /> 04/20/92 1112 — 3791 004 — -- — -- -- <br /> 04121/92 — — — — 560 150 <5 36 29 - <br /> 07/08/92 1131 -- 3772 — 590 150 2 1 36 39 — -- <br /> 10/07/92 1145 — 3758 -014 — -- -- -- -- ' <br /> 10/08/92 — — — — 1,200 240 48 62 97 -- <br /> 01/18/93 1045 -- 3858 -- -- -- -- -- -- <br /> 01/19193 — — — — 1,200 240 55 44 90 -- <br /> 04/14/93 1087 — 3816 - -- -- -- -- — — - <br /> 04/15/93 -- -- — - 810 160 42 47 63 - <br /> 08/31/93 (c) 1098 — - - 100 33 <0 5 6 13 - <br /> 10/27/93 1098 — — - 200 12 12 79 16 -- <br /> 02/18/94 1031 — - - 950 140 5 73 30 <br /> 05/20/94 1071 -- — -- 8,100 590 59 190 220 - <br /> 10/07/94 1100 — — 1 100 30 1 16 73 -- - <br /> 12/16/94 1061 — - -- 1,600 310 23 350 200 -- <br /> 02/28/95 1068 — - - 4,600 180 <5 750 100 - - <br /> 04126/95 1094 — -- -- 1,100 19 <1 110 83 -- <br /> 07/27/95 11 11 — — - 1,700 12 <2 5 170 84 -- - <br />