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7 Table 1 Groundwater Elevation and Analytical Data ARCO Service Station No 2093 3425 Tray Boulevard Tracy Caldomia Well Depth Groundwater Groundwater Product Ethyl- Xylenes Well Date Elevation to Water Elevation Elevation Thickness TPHg Benzene Toluene benzene (total) M16E DO Number Sampled ft,MSL) (ft,TOC)_ ft,MSL Change(fl) (ft) (1119/L) (Ug/L) WWI-) (frg/L) (Mg/L) C-g/L) OWL ATR-4 4/23/1987 4903 1085 3818 -- - 21 000 3 000 200 <10 950 - - 12/22/1987 11 00 3803 015 - 5 300 310 430 270 3/24/1988 1098 3805 002 6 000 5 800 320 930 740 - 6/23/1988 1211 3692 1 13 - 5200 237 8 8 2 0 10 - - 9/29/1988 1072 3831 1 39 - 1,400 1 430 115 350 130 -- -- 2/22/1989 1091 3812 -019 22 000 1 300 82 54 170 - 6/29/1989 11 00 3803 -0 09 - 1 300 590 38 97 220 - - 9/18/1989 11 19 3784 019 630 280 13 49 100 - 12/28/1989 11 08 3795 Oil 1 300 500 25 56 160 -4/18/1990 11 25 3778 017 - 440 150 51 35 63 10/16/1990 11 38 3765 013 - 38D 26 41 48 0 38 - 1/10/1991 11 16 3787 022 - 330 150 31 30 35 4A 0/1991 1099 3804 017 500 8 4 <0 5 <0 5 24 7/10/1991 11 32 3771 -033 190 39 <0 5 37 3 9/24/1991 11 57 3746 -025 70 22 <05 42 1 5 1/23/1992 11 16 3787 0 41 1 200 300 52 49 72 - 4/20/l 992 11 12 3791 004 - - - - 4/21/1992 - - - 560 150 <50 36 29 - - 7/8/1992 11 31 3772 - 590 150 21 36 39 - - 10/7/1992 11 45 3758 -014 - - - - - - _ 10/8/1992 - - 1 200 240 48 62 97 1/1811993 1045 3858 - - - - - - _ 1119/1993 - - 1 200 240 55 44 90 4/14/1993 1087 3816 - -- - - - _ 4/15/1993 - -- 810 160 42 47 63 8/31/1993 (a] 1098 - - 100 33 <0 5 6 0 13 - -- 10/27/1993 1098 - 000 200 12 1 2 7 9 16 - 2/18/1994 1031 - 067 - 950 140 5 0 73 30 - - 5/20/i 994 1071 - 040 - 8 100 590 59 190 220 - - 10(711994 1100 - 029 j 1 100 30 1 O 16 73 - _ 12 /16/1994 1061 039 1 600 310 2 3 350 200 2/28/1995 1068 007 4 600 180 <5 O 750 100 - 4/26/1995 1094 - 026 1 100 19 <1 0 110 8 3 - - 7/27/1995 11 11 017 1 700 12 <2 5 170 8 4 - 10/26/1995 11 18 007 - - - - - 10/27/1995 - -- - 600 7 0 <1 0 30 2 0 - 2/12/1996 1043 - 6 300 <0 5 <0 5 340 150 4/18/1996 1077 034 770 <1 0 <1 0 41 1 9 - - 7/18/1996 1052 - 025 - 2 600 12 <5 52 <5 560 11/15/1996 11 51 - 0 99 440 <0 5 <0 5 08 22 140 - 3/14/1997 11 57 - 006 150 1 5 <0 5 <0 5 <0 5 670 007 6/4/1997 NP 1093 _ 064 - 420 8 7 1 4 1 2 1 3 54 008 8/11/1997 NP 1055 038 - 320 2 4 1 1 <0 5 57 6 3 - 11/17/1997 NP 11 20 -065 - 420 33 1 4 <0 5 076 48 - 3/30l1998 NP 1038 082 <50 <0 5 <0 5 <0 5 <0 5 <50 1 1 6/25/1998 NP 1040 -002 - 658 <0 5 <0 5 <0 5 <0 5 <50 1 9/11/1998 NP 11 06 066 <50 <0 5 <0 5 <0 5 <0 5 <2 5 084 12/15/1998 NP 1075 - 031 <50 <0 5 <0 5 <0 5 <0 5 <50 1 1 3/17/1999 NP 1053 022 <50 <0 5 <0 5 <0 5 <0 5 <50 67 5/1 411 99 9 NP 1097 -044 <50 0 591 <0 5 <0 5 <05 8 720 2 O 9/16/1999 NP 1093 - 004 <50 <0 5 <0 5 <0 5 <O 5 <50 68 12/22/1999 NP 1089 004 <50 <0 5 <0 5 <0 5 <0 5 857 1 58 2/29/2000 NP 1026 063 - <50 <0 5 <0 5 <0 5 <0 5 <25 31 6/7/2000 NP 11 06 - -080 <50 <0 5 <0 5 <0 5 <0 5 8 42 - 9/25/2000 NP 11 24 -018 - <50 <05 <O 5 <0 5 <0 5 280 070 12/29/2000 P 1081 043 - <50 <0 5 <0 5 <0 5 <0 5 636' 45 3/27/2001 P 1064 017 - <50 <0 5 <0 5 <0 5 <0 5 <2 00' 31 6/20/2001 P 1084 - 020 <50 <0 5 <0 5 <0 5 <0 5 <2 0' - 9/12/2001 P 1094 010 <50 <0 5 <0 5 <0 5 <0 5 <25 24 12/19/2001 P 1078 - 016 <50 <0 5 <0 5 <O 5 <05 <2 0' 1 59 3/14/2002 P 1078 - 000 <50 <0 5 <0 5 <0 5 <O S 710' 1 29 6/28/2002 P 1078 000 <50 <0 5 <0 5 <0 5 <0 5 <0 5' 35 9/11/2002 P 1092 014 <50 <0 5 <0 5 <0 5 <0 5 <0 5 33 12/17/2002Well inaccessible 3/3V2003* P 1072 - - <50 <0 5 <0 5 <0 5 <0 5 <0 5' 39 6/9/2003 P 1077 - - - <50 <0 5 <0 5 <0 5 066 <0 5' 52 9/18!2003 P 1097 - -- <50 <0 5 <0 5 <0 5 <0 5 <0 5' 38 1 212 4/2 003 P 1074 - - <50 <0 5 <0 5 <0 5 <0 5 <O 5• 25 K MvwO W5 BP RRC0102QW%Ck a.IV4 OTA 0312093 QWMR 4003 Page 4 of 14