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Table 1 Page 5 of 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 Elevation Elevation Change TPHg Benzene Toluene Ethylbenzene Xylenes MTBE DO Sampled (feet MSL) (feet,TOC) in feet (feet,MSL) (feet) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (mg/1) 06/04/97 1270 -- -- -- -- - - 0 15 ATR 3 08/11/97 NP 1272 3 400 20 <10 160 110 <50 - (cont) 11/17/97 1293 -- -- - - -- -- -- 03/30/98 NP 12 18 - 8400 <2 5 <2 5 100 52 120 08 06/25/98 1241 - — -- -- -- -- - 09/11/98 NP 1284 1,100 61 <05 25 22 41 123 12/15/98 1160 - -- -- - - 21 03/17/99 NP 1241 652 141 <0 5 117 729 164 78 05/14/99 1270 -- -- -- - - 120 09/16/99 NP 1279 2,800 175 <5 0 499 151 523 19 12/22/99 1276 -- -- _ -- - 037 02/29/00 NP 12 10 405 235 <1 00 515 1 18 2 160 36 06/07/00 NP 1281 09/25/00 NP 1301 2,350 <2 50 565 269 640 464 060 12/29/00 11 47 -- -- -- -- -- 42 ATR-4 04!23187 4903 1085 38 18 -- 21,000 3,000 200 <10 950 12/22/87 11 00 3803 015 -- 5,300 310 430 270 03/24/88 1098 3805 002 6,000 5,800 320 930 740 06/23/88 12 11 3692 -1 13 5,200 237 88 2 10 09/29/88 1072 3831 139 1,400 1,430 115 350 130 02/22/89 1091 38 12 -019 22 000 1 300 82 54 170 06/29/89 11 00 3803 -009 1,300 590 38 97 220 09/18/89 11 19 3784 0 19 630 280 13 49 100 12/28/89 11 08 3795 Oil 1,300 500 25 56 160 04/18!90 11 25 3778 -017 440 150 51 35 63 10/16/90 11 38 3765 -013 380 26 41 48 038 01/10/91 11 16 3787 022 330 150 31 30 35 04/10/91 1099 3804 017 500 84 <0 5 <0 5 24 07/10/91 11 32 3771 -033 190 39 <0 5 37 3 09/24/91 11 57 3746 -025 70 22 <05 42 1 5 01/23192 11 16 3787 041 1,200 300 52 49 72 04/20/92 11 12 3791 004 - -- -- -- - 04/21/92 - -- 560 150 <5 36 29 -- 07/08/92 1131 3772 -- 590 150 21 36 39 10/07/92 1145 3758 -014 -- -- -- -- -- 10/08/92 - -- - 1,200 240 48 62 97 -- 01/18/93 1045 3858 01/19/93 - -- - 1,200 240 55 44 90 -- 04/14/93 1087 38 16 -- -- -- -- --