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Table 1 Groundwater Elevation and Analytical Data ARCO Service Station No 2093 3425 Tracy Boulevard Tracy California Well Depth Groundwater Groundwater Product Ethyl- Xylenes Well Date Elevation to Water Elevation Elevation Thickness TPHg Benzene Toluene benzene (total) M1BE DO Number Sam led (ft,MSL) (ft,TOC) (ft MSL) Change(ft) (ft) (p9/L) (99/L) (pg/L) (F91L) (Pg/L) (/rg/L (mg/L ATR-2 423/1987 49 22 11 28 3794 - - <100 <0 6 06 <0 5 <05 - 12/22/1987 It 40 37132 012 <0 5 <0 5 <0 5 <0 5 - 3/24/1988 11 35 3787 0 05 - <05 <0 5 <0 5 <0 5 - - 6/23/1988 11 55 3767 0 20 <0 5 <0 5 <0 5 <0 5 » 929/1988 11 71 3751 0 16 - <0 5 <0 5 <0 5 <0 5 - - 2/22/1989 11 35 3787 036 370 1 8 0 7 06 34 - - 6/21/1989 11 45 3777 010 <50 1 9 <0 3 04 <0 3 9/18/1989 11 65 3757 020 - 9 1 9 O 9 1 1 82 - - 1227/1989 11 50 3772 015 <50 3 5 <0 3 1 1 03 - » 4/18/1990 It 54 3758 0 14 50 2 9 <0 3 <0 3 <0 3 - - 10/16/1990 11 8t 3741 017 <50 <0 5 <0 5 <0 5 <0 5 — 10/19/1990 11 81 3741 000 — — - - — _ 1110/1991 11 58 3764 023 <50 0 8 <0 5 <0 5 <0 5 — » 4/10/1991 11 35 3787 023 <50 <0 5 <0 5 <0 5 <0 5 — — 7/10/1991 11 74 3748 -0 39 <50 <0 5 <0 5 <0 5 <0 5 — — 924/1991 1202 3720 028 <50 <0 5 <0 5 <0 5 <0 5 — — 123/1992 11 60 37 62 042 <50 <05 <0 5 <0 5 <0 5 — 420/1992 11 53 3769 007 — <50 <0 5 <0 5 <0 5 <0 5 » 7/8/1992 11 75 3747 022 <50 2 8 <0 5 <0 5 <0 5 — 10/7/1992 11 83 3739 -008 — 59 5 7 <0 5 <0 5 <0 5 — — 1/18/93 -- — 4/14/1993 11 29 3793 -- — 55 3 8 0 7 08 1 9 — — 8/30/1993 11 96 37 26 -067 — <50 <0 5 <0 5 <0 5 <0 5 — — 10/27/1993 11 95 3727 0 01 <50 <0 5 <0 5 <0 5 <0 5 2/18/1994 11 54 3768 0 41 — <10 0 7 09 <0 3 07 — 620/1994 11 61 3761 0 07 <10 0 9 <0 3 <0 3 <0 5 10/7/1994 11 93 3729 0 32 <50 <0 5 <0 5 <0 5 <0 5 - — 12/16/1994 11 56 3766 037 — <50 <O 5 <0 5 <0 5 <0 5 — » 228/1995 11 60 3762 -0 04 <50 <0 5 <0 5 <0 5 <0 5 — 425/1995 11 95 3727 -035 <50 <0 5 <0 5 <05 <0 5 7/27/1995 1291 36 31 -0 96 <50 <0 5 <0 5 <0 5 <0 5 1026/1995 1226 3696 065 <50 <0 5 <0 5 <0 5 <0 5 — — 2/12/1996 11 40 3782 086 <50 <0 5 <0 5 <0 5 <0 5 4/18/1996 11 90 3732 -050 <250 <2 5 <2 5 <2 5 <2 5 — » 7/18/1996 1210 3712 020 <50 <0 5 <0 5 <0 5 <0 5 500 11/15/1996 1270 3652 060 — <60 <0 5 <0 5 <0 5 <0 5 750 — 3/14/1997 P 1270 3652 000 <50 <0 5 <0 5 <0 5 <0 5 280 008 6/4/1997 NP 1202 3720 068 <50 0 64 <0 5 <0 5 <0 5 480 006 8/11/1997 P 1233 3689 -0 31 <50 <0 5 <0 5 <0 5 <0 5 440 11/17/1997 P 1226 3696 0 07 <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 <O 5 1820" 1 2 625/1998 NP 1205 3717 023 — <50 <0 5 <0 5 <0 5 <0 5 109 1 6 9/11/1998 NP 1212 3710 007 — <50 <0 5 <0 5 <0 5 <0 5 250 1 67 12/15/1998 NP 1201 37 21 O 1 t <50 <0 5 <0 5 <0 5 <O 5 <5 0 1 5 3/17/1999 NP 11 65 3757 036 <50 <0 5 <0 5 <0 5 <0 5 <5 0 23 5/14/1999 NP 1205 3717 -040 — <50 <O 5 <O 5 <O 5 <0 5 <5 0 1 90 9/16/1999 NP 1223 3699 -018 — <50 <0 5 <0 5 <0 5 <0 5 <5 O 37 12/22/1999 NP 1214 3708 009 <50 <O 5 <0 5 <O 5 <0 5 <2 50 743 2292000 NP 11 50 37 72 0 64 <50 <0 5 <0 5 <0 5 <0 5 483 51 6/772000 NP 1211 3711 0 61 — <60 <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 12292000 P 1203 3719 008 <50 0 <0 5 <0 5 <0 5 <0 5 89" 56 3/272001 P 11 92 3730 0 1 1 <50 0 <0 5 <0 5 <0 5 <0 5 37 2' 41 6202001 P 1203 3719 -011 <50 <0 5 <0 5 <0 5 <0 5 96' - 9/122001 P 1218 3704 -015 <500 <5 O <5 0 <50 <50 500 2 9 12/19/2001 P 11 97 3725 0 21 — <500 <5 0 <5 0 <5 0 <50 250' 082 3/142002 P 1200 3722 -003 <500 <5 0 <5 0 <5 0 <50 98' 082 6282002 P 1212 3710 012 170 <0 5 <0 5 <0 5 <0 5 300" 1 5 9/11/2002 P 1210 3712 002 54 <0 5 <0 5 <05 <0 5 110' 1 9 12/17/2002 P 11 44 3778 066 <50 <O 5 <0 5 <05 <0 5 16' 1 4 3/31/2003' P 1220 3702 0 76 <50 <0 5 <0 5 <05 <O 5 50, 1 4 6/9/2003 P 1192 3730 028 <50 <0 5 <0 5 <0 5 <0 5 54' 1 7 9/182003 P 1199 3723 007 <50 <0 5 <0 5 <0 5 <0 5 9 4' 1 9 1212412003 P 11 86 3736 013 — <50 <O 5 <0 5 <D5 <0 5 141 23 i K MfHw SUS BP AR00102093\0 a 1e tyn4 OTA 0312093 OWIuR 4Q03 Page 2 of 14