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Table 1 Groundwater Elevation and Analytical Data ARCO Service Slahon No 2093 3425 Tracy Boulevard Tracy,Caldornia Well Depth Groundwater Groundwater Product Ethyl- Xylenes Well Date Elevation to Water Elevation Elevation Thickness TPlig Benzene Toluene benzene (total) MIRE DO Mumber Sampled (tt,MSL) (ft,TOC) (ft,MSL) change(ft) (ft) (f,g/L) (1r91L) (819/L) (NglL) (pg/L) W/L) (mg'L) 6/26/2002 P IZ48 3717 0 06 <50 <05 <05 <05 <0 5 0 97' 36 ATA 7 9/11/2002 P 1244 3-721 004 <50 <05 <05 <05 <05 1 1' 29 (cord) 12/17/2002 P 11 96 3769 048 <50 <05 <0 5 <05 <05 <0 5' 39 3!31/2003" P 1237 3728 041 <50 <05 <0 5 <0 5 <05 <0 5` 28 6/9/2003 P 12.34 3731 003 <50 <05 <0 5 <0 5 <05 <0 5' 30 9/1812003 P 1252 3713 -018 <50 405 <OS K05 405 <05• 3.8 ATR 8 8/251991 4598 2,700 110 <O5 130 98 9/25.1991 885 3713 1 400 95 <0 5 51 97 1/23/1992 829 3769 056 <50 25 <0 5 <05 <05 4/20/1992 8 11 3787 018 _ 4121/1892 - 140 14 09 14 93 7/8/1992 6 48 3750 87 40 <05 92 08 106x7/1992 6 69 3729 021 10/8/1992 140 78 32 11 88 1118/1993 7 09 3889 1/19/1993 - 980 140 17 11 34 4/14/1993 780 38 18 4/15/1993 110 42 <05 46 49 8/31/1993 931 3517 700 150 15 41 71 10/27/1993 sea 3730 113 - 52,000 620 2,100 2,800 8,700 2/17/981 825 3764 054 014 - _ 5/20194A 855 3754 030 014 107/94A 870 3739 015 014 _ 12/16/1994 821 37 77 038 sheen _ 2126/95^ 845 3755 022 002 4/26/95" 851 3786 031 050 7/27/85^ gas 3822 163 012 10/26/95^ 928 3672 050 003 2/12/96A 787 3813 140 002 4118/96^ 845 3755 058 002 7/18/1998 895 W 03 052 88 000 72 220 620 2,500 <500 11/151996 940 36 56 045 52,000 110 130 240 1 300 4200 .- 3/14/1997 924 4574 010 350 42 <05 16 26 <25 01 6/4/1997 NP 869 37 29 055 - 1,200 42 52 82 150 <25 003 811111997 NP 910 36 BS 041 7 800 280 75 140 710 <25 11/17/1997 NP 4,200 57 <0 5 <0 5 250 <25 3/30/1998 NP 802 3796 320 17 <0 5 <0 5 24 <S.0/<20' 08 6/25/1998 NP 969 3629 167 876 300 190 871 176 <50 14 9/11/1998 Well paved over 12/1511998 NP 4611 886 3725 - 456 102 0 690 612 809 <5 0 07 3/17/1999 NP 855 3756 031 130 212 052a 212 271 <50 25 511411999 NP 881 37 30 026 155 179 <0 5 241 2.00 <5 0 42 9/16/1999 NP 917 3694 036 747 Z78 142 988 840 <5 0 18 12/2211999 NP 799 3812 -118 648 <05 0 586 5 85 536 <250 031 2129/2000 IVP 818 3793 -019 142 160 <05 239 138 <250 02 6/7/2000 NP 902 3709 0 84 576 482 <0 500 843 <250 <125 9/252000 NP 987 3624 085 2 720 563 114 331 473 <50 0 - 12129/2000 P 838 3773 149 2,350 <5 00 <5 00 191 <5 00 <200• 51 3/27/2001 P 966 3645 128 <50 0 <0 500 <0 500 <0 500 <0 500 <200' 27 6/2012001 P 899 3712 067 150 <1 0 <1 0 15 29 QO' - 9/12/2001 P 911 37 00 -012 810 13 37 44 84 <25 17 121191"1 P 878 3733 033 %0' 081 <0 50 25 is 21' 048 3/14/2002 P 880 3731 002 170 <0 50 <0 50 071 <0 50 <0 50' 072 6/26/2002 P 910 3701 -030 260 079 056 27 <05 082, 10 9/11/2002 P 914 3697 004 — 150 30 07 42 14 0 73' 23 12117/2002 P 833 3778 081 420 <20 <20 64 76 17, 14 313112003' P 875 37 35 042 260 <0 50 <0 5 056 <0 50 1 1' 08 6/9/2009 P 881 3730 006 220 <0 50 0 61 1 19 <0 50 <0 50' 43 8/1812003 P 8.92 $719 -011 230 058 <0.5 05 405 13. 115 ATR 9 10/16/1990 4863 <50 <0 5 <05 <0 5 <05 10/19/1990 11 11 37 57 1/10/1991 1104 3764 007 <50 <0 5 <0 5 <05 <05 4/10/1991 1082 3786 022 <50 <05 <0 5 <05 <05 7/10/1991 11 06 3762 024 - <50 <05 <05 <05 <0 5 9/24/1991 1129 37 39 023 _ 91251991 - <50 <05 <05 <05 <0 5 . 1/23/1992 1096 3772 — <50 <0 5 <05 <0 5 <05 - - 4/20/1992 1088 3780 008 412111992 <50 <05 <0 5 <05 <05 7/10992 11 06 37 62 <50 <05 <0 5 <05 <05 10/711992 it 16 3752 010 <50 <05 <05 <05 <0 5 XIWPMo—U5 UP ARCa0209MO" W QTR 0'2003 cwm 3003 Page 7 of I I