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Page 3 of 17 a 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(it) (ft) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (mg/L) ATR 2 2/12/1996 11 40 37 82 0 86 <50 <0 5 <0 5 <0 5 <0 5 (cant) 4/18/1996 11 90 37 32 0 50 <250 <25 <2 5 <2 5 <25 — 7/18/1996 1210 3712 020 <50 <0 5 <0 5 <0 5 <05 500 11!15/1996 1270 36 52 060 <50 <0 5 <0 5 <0 5 <05 750 3/14/1997 P 1270 36 52 000 <50 <0 5 <0 5 <0 5 <0 5 280 008 6/4/1997 NP 1202 37 20 0 68 <50 064 <0 5 <0 5 <0 5 480 006 8/11/1997 P 1233 36 89 0 31 <50 <05 <0 5 <0 5 <0 5 440 11/1711997 P 1226 3696 007 <50 <0 5 <0 5 <0 5 <0 5 98 3/30/1998 NP 11 82 3740 044 <50 <0 5 <0 5 <0 5 <0 5 18120 1 2 6/25/1998 NP 1205 3717 -023 <50 <0 5 <05 <0 5 <0 5 109 1 6 911111998 NP 1212 3710 -007 — <50 <0 5 <0 5 <0 5 <0 5 250 1 67 12/15/1998 NP 1201 3721 Oil <50 <0 5 <0 5 <0 5 <0 5 <5 0 15 3/17/1999 NP 11 65 3757 0 36 — <50 <0 5 <0 5 <0 5 <0 5 <5 0 2 3 5/14/1999 NP 1205 3717 040 <50 <0 5 <0 5 <0 5 <0 5 <5 0 1 90 9/16/1999 NP 12 23 3699 018 <50 <0 5 <0 5 <0 5 <0 5 <50 3 7 1212211999 NP 1214 3706 009 <50 <0 5 <0 5 <0 5 <0 5 <2 50 743 2/29/2000 NP 1 i 50 3772 0 64 <50 <0 5 <0 5 <0 5 <0 5 4 83 51 617/2000 NP 1211 3711 -061 — <50 <0 5 <0 5 <0 5 <0 5 126 9/25/2000 NP 1211 3711 000 <50 <0 5 <0 5 <0 5 <0 5 141 0 30 12/29/2000 P 1203 3719 008 <50 0 <0 500 <0 500 <0 500 <0 500 89 5 6 3/27/2001 P 11 92 3730 Oil <50 0 <0 500 <0 500 <0 500 <0 500 37 2 41 6/20/2001 P 1203 3719 Oil <50 <0 50 <0 50 <0 50 <0 50 96' 9/12/2001 P 1218 $704 -015 <500 <50 <5 0 <50 <5 0 500 2 9 1 211 91200 1 P it 97 3725 0 21 <500 <50 <5 0 <5 0 <50 250 082 3114!2002 P 1200 3722 003 <500 <50 <5 0 <5 0 <5 0 98' 082 6/28/2002 P 1212 3710 012 — 170 <0 50 <0 50 <0 50 <0 50 300' 15 9/11/2002 P 1210 3712 002 54 <0 50 <0 50 <0 50 <0 50 110' 1 9 12/17/2002 P 11 44 3778 066 <50 <0 50 <0 50 <0 50 <0 50 16' 1 4 3/31/2003 P 1220 3702 076 <50 <0 50 <0 50 <0 50 <0 50 5 0 1 4 619/2003 P 11 92 3730 0 28 — <50 <0 30 <0 50 <0 50 <0 50 5 4 1 7 ATR 3 4/23/1987 49 93 11 79 38 14 — 17 000 2 300 180 <50 2,300 12/22/1987 1193 38 00 014 — — 5,000 50 530 250 3/24/1988 1258 3735 0 65 43,000 8 300 8,700 4 400 7 800 6/23/1988 11 17 3876 1 41 70,000 6 160 4,221 1 800 4 750 — 9/29/1988 1223 3770 106 57 400 8,850 17 600 2 190 8,170 -- — 2/22/1989 1162 3811 0 41 110 000 1 000 2,100 480 2000 -- 6/29/1989 4,500 890 520 250 1100 -- -- 9/18/1989 1219 3774 7 400 1 000 1 300 460 2,200 -- -- 12/28/1989 12 01 3792 018 27,000 840 1,400 840 5,600 — — 4/18/1990 1215 3778 014 4800 1,000 490 340 1,500 — 10/16/1990 1235 37 58 0 20 14 000 1 900 1 300 780 4 600 10/19/1990 1228 37 65 0 07 — - — — 1/10/1991 1201 37 92 027 2 600 610 230 160 670 -- 4/10/1991 1182 3811 019 — 3 000 910 120 110 190 -- 7/10/1991 1223 3770 0 41 — 19 000 420 300 340 760 9/24/1991 12 57 9706 0,34 2,000 260 81 69 130 1/23/1992 1212 3781 045 sheen — — — -- -- 4/20/1992 11 93 3800 019 sheen -- — K kV4,-®U5 SP AA0010209310uerterW QTR 0312003 0"R 2003