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i i • Page 1 of 17 Table 1 Groundwater Elevation and Analytical Data ARCO Service Station#2093 3425 Tracy Boulevard,Tracy,CA Well Depth Groundwater Groundwater Product Ethyl Xylenes Well Date Elevation to Water Elevation Elevation Thickness TPHg Benzene Toluene benzene (total) MtBE DO Number Sampled (ft MSL) (ft TOC) (ft,MSL) Change(ft) (H) (ug/L) (ug/L) 140 (vg/L) (ug/L) (u /L) (mg/L} ATR-1 4/23/1987 5058 1249 3809 — <100 <0 5 <0 5 <0 5 23 12/22/1987 1263 3795 -014 — — 5 9 <0 5 0 9 <0 5 — 3/24/1988 1254 3804 009 — <0 5 <0 5 <0 5 <0 5 — — W23/1988 1283 3775 -029 <0 5 1 3 4 3 22 — — 9/29/1988 13 01 37 57 -018 — — <0 5 <0 5 <0 5 <0 5 — 2/22/1989 1246 3812 0 55 -- <100 1 4 <0 5 <0 5 1 8 — 6/21/1989 1237 38 21 009 -- 520 360 0 B 21 36 — 9/18/1989 1288 3770 0 51 -- 27 000 250 1,200 570 7,100 12/27/1989 1268 3790 020 <50 3 4 <0 3 1 3 1 4 — 4/18/1990 1284 37 74 016 13 21 1 5 16 16 10/16/1990 — <50 1 0 <0 5 2 0 2 0 t0/19/1990 1310 3748 — -- - — - _ 1/10/1991 1278 3780 0 32 — <50 2 4 <0 5 5 7 23 4/10/1991 1252 3606 026 — 73 1 3 <0 5 4 8 <0 5 7/10/1991 1295 3763 043 -- 90 2 <05 4 7 1 7 9/24/1991 13 30 3728 -0 35 — <50 <0 5 <0 5 <0 5 <05 1/23/1992 12 77 3781 053 <50 <0 5 <0 5 <05 <0 5 4120/1992 1258 380 019 <50 <0 5 <05 <0 5 <0 5 7/8/1992 1290 5768 0 32 — <50 <0 5 <05 0 6 <0 5 10/7/1992 1309 3749 019 <50 <0 5 <0 5 <0 5 <0 5 — 1/18/93 4/14/1993 1231 3827 — <50 <0 5 <0 5 15 <0 5 8/30/1993 1318 3740 087 <50 <05 <0 5 <0 5 <0 5 10/27/1993 13 13 3745 005 <50 <0 5 <0 5 <0 5 <0 5 2/18/1994 1265 3793 048 — 17 0 6 1 0 1 0 0 8 5/20/1994 12 7t 3787 006 27 0 6 0 3 1 4 <0 5 10/7/1994 13 14 9744 -0 43 — <50 <0 5 <0 5 <0 5 <0 5 12/16/1994 1274 37 84 040 <50 <0 5 <0 5 <0 5 <05 2/28/1995 1265 3793 009 — <50 <0 5 <0 5 1 0 <0 5 4/26/1995 1290 3768 025 <50 <0 5 <0 5 <0 5 <0 5 7/27/1995 1322 37 36 032 -- - 10/26/1995 13 40 3718 018 10/27/1995 — -- <50 <0 5 <0 5 <05 <05 2/12/1996 1230 3828 120 <0 5 <0 5 22 <0 5 -- 4/18/1996 1290 3768 0 60 _ — 7/18/1996 1328 3730 038 <50 <0 5 <0 5 <05 <0 5 <50 11/15/1996 13 74 36 84 046 -- — 3/14/1997 NP 1368 3690 006 -- <50 <0 5 <0 5 <0 5 <05 — 030 6/4/1997 13 04 3754 0 64 — 022 8/11/1997 NP 1343 37 15 0 39 — <50 <0 5 <0 5 <05 <05 23 11/17/1997 1329 3729 014 — — — _ - 3/30/1998 NP 1258 3600 0 71 <50 <0 5 <0 5 <05 <0 5 <5 0 2 00 6/25/1998 1356 3702 0 98 — — — 9/11/1998 NP 1320 3738 036 <50 <0 5 <0 5 <05 <05 <2 5 104 12/15/1998 1302 3756 018 — -- — 130 3/17/1999 NP 1279 3779 0 23 <50 <0 5 <0 5 <0 5 <05 <5 0 510 5/14/1999 1306 3752 -027 — -- 220 911611999 NP 1336 37 22 -030 <50 <0 5 <0 5 <0 5 <0 5 <5 0 330 9 Mproaee W BP ARGD4GM%Qu tm142 QTR DAM3 Q MR 2QO3