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Table 1 <br /> Groundwater Elevation and Analytical Data <br /> ARCO Service Station No 2093 <br /> 3425 Tracy Boulevard Tracy California <br /> Adak <br /> Well Depth Groundwater Groundwater Product Ethyl- Xylenes <br /> Well Date Elevation to Water Elevation Elevation Thickness TPHg Benzene Toluene benzene (total) M1BE DO <br /> Number Sampled ift,MSL) ft,TOC) k MSL) Change(ft (ft) Mwt) (Ag/L) (pg/L) (pg/L) (pglL (NglL) mgR <br /> ATF[3 4/23/1987 4993 11 79 3814 -- 17 000 2 300 180 <5 0 2 300 — <br /> 12I22/1987 1193 3800 -014 — » 5 000 50 530 250 — — <br /> 3/24/1986 1258 37 35 -0 65 — 43 000 8 300 8 700 4 400 7 800 — <br /> 6/23/1988 11 17 3876 1 41 — 70 000 6 160 4 221 1 800 4 750 — <br /> 9/29/1988 1223 3770 1 06 57 400 8 850 17 600 2 190 8 170 <br /> 2/22/1989 It 82 3811 0 41 — 110 000 1 000 2 100 480 2000 » <br /> 6/29/1989 — — — — 4 500 890 520 250 1 100 _ <br /> 9/18/1989 1219 3774 -- — 7 400 1 000 1 300 460 2200 — <br /> 12/28/1989 1201 3792 018 27 000 840 1 400 840 5 600 — — <br /> 4/18/1990 1215 3778 0 14 4 800 1 000 490 340 1 500 <br /> 10/16/1990 1235 3758 -020 14 000 1 900 1 300 780 4 600 <br /> 10/19/1990 1228 3765 007 — - - — -- <br /> 1/10/1991 1201 3792 027 2 600 610 230 160 670 — <br /> 4/10/1991 11 82 3811 019 3 000 910 120 110 190 <br /> 7/10/1991 1223 3770 -0 41 — 19 000 420 300 340 760 — <br /> 9/24/1991 1257 3736 -0 34 2000 280 81 69 130 <br /> 1/2311992 1212 3781 04,5 Sheen — -- — — — — » <br /> 4/20/1992 11 93 3800 019 sheen — <br /> 7/8/1992 1222 3771 -029 sheen — <br /> 10x//1992 1238 3755 -016 sheen — — <br /> 1/18/1993 1122 3871 116 sheen — — — — <br /> 4/14/1993 11 49 38 44 -027 sheen — <br /> 8/30/1993 1243 3750 0 94 sheen — — <br /> 101°27/1993 1239 3754 004 sheen — - - — — — <br /> 2/18/1994 1200 3793 0 39 — 1 900 200 27 120 140 <br /> 5/20/1994 1207 3786 007 sheen — - — — -- — <br /> 10/7/1994 1238 3755 -031 sheen — — — — — <br /> 12/16/1994 1203 3790 0 35 sheen — — <br /> 2/28195^ 1205 3790 0 00 003 <br /> 4/26/1995 1232 3761 029 sheen <br /> 1995 1251 3742 019 - <br /> 10/260/26/1995 (a) 1297 <br /> 2/12/1996 1210 087 1,500 89 <0 5 43 150 <br /> 4/18/1996 1260 _ 050 — - -- - - — — — <br /> 7/18/1996 1260 000 — 1 600 26 62 70 51 1 800 <br /> 11/15/1996 1340 080 — » <br /> 3/14/1997 NP 1334 — 006 1 200 10 <0 5 43 19 620 005 <br /> 6/4/1997 1270 — 064 — - — - — — 015 <br /> 8/11/1997 NP 1272 — 0 02 3 400 20 <10 160 110 <50 <br /> 11/17/1997 1293 0 21 — - _ — <br /> 3l30/1998 NP 1218 — 075 — 8400 <2 5 <2 5 100 52 120 08 <br /> 6/25/1998 1241 — 0 23 — — — — — - <br /> 9/11/1998 NP 1284 — -043 1,100 61 <0 5 25 22 41 123 <br /> 12/15/1998 1160 — 1 24 _ - — — - — - 21 <br /> 3/17/1999 NP 1241 — -081 652 1 41 <0 5 11 7 729 164 78 <br /> 5/14/1999 1270 -0 29 — — - — — 120 <br /> 9/16/1999 NP 1279 — 009 2,800 175 <5 0 499 151 52 3 1 9 <br /> 12/22/1999 1276 003 » — -- — — — - 037 <br /> 2/29/2000 NP 1210 — 066 405 2 35 <1 00 515 1 18 2 160 3 6 <br /> 6///2000 NP 1281 0 71 - — — — - -- <br /> 9/25/2000 NP 1301 — 020 — 2,350 <2 50 565 26 9 840 464 060 <br /> 12/29/2000 11 47 — 1 54 — — - 42 <br /> 3/27/2001 P 1249 — 1 02 <50 0 <0 500 <0 500 <0 500 <0 500 526' 32 <br /> 6/20/2001 1265 016 - - - — - _ <br /> 9/12/2001 P 1271 0 06 _ 54 0 53 1 0 056 25 83 2 5 <br /> 12/19/2001 1256 — G15 — — - - - — - <br /> 3/14/2002 P 1257 0 01 2300 <10 10 <10 <10 <5 0' 1 28 <br /> 6/28/2002 — — — - — - — — — <br /> 9/11/2002 P 12713 - 51 <06 <0 5 <0 5 <0 5 <0 5' 2 9 <br /> 12/17/2002 — — — — _ — .- — <br /> 3/31/200,3 P 1256 — - — 150 <0 5 <06 <0 5 <0 5 52' 2 8 <br /> 6/9/2003 1047 — - Not Sampled <br /> 9/18/2003 P 1279 — 70 <O 5 <O 5 <0 5 <O 5 <0 5' 27 <br /> 12/24/2003 1264 — - — Not Sampled <br /> K Mjmme�WS BP ARC0402093%QuarlWM4 OtR 0342003 UWMR 4Q03 Page 3 of 14 <br />