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Table 1 <br /> Groundwater Elevation and Analytical Data <br /> ARCO Service Station No 2093 <br /> 3425 Tracy Blvd, Tracy, CA <br /> TOC Depth to Water Level Ethyl- Total <br /> Well Date PI Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO <br /> Number Sampled NP (feet msl) (feet bgs) (feet msl) (pg/L) (pg1L) (nIL) (pg/L) (,ug1L) (pg1L) (pg1L) (mg/L) Comments <br /> ATR-8 11/15/1996 - 4598 940 3658 52,000 — 110 130 240 1,300 <200 — <br /> 3/14/1997 4598 924 3674 350 -- 42 <05 1 6 26 <2 5 01 <br /> 6/4/1997 NP 4598 869 3729 1,200 — 42 52 82 150 <2 5 003 <br /> 8/11/1997 NP 4598 910 3688 7,800 — 280 75 140 710 <25 -- <br /> 11l17/1997 NP 4598 — -- 4200 — 57 <05 <0 5 250 <25 — <br /> 3/30/1998 NP 4598 802 3796 320 — 17 <05 <0 5 24 <5 0/<2 0* 08 <br /> 6/25/1998 NP 4598 969 3629 876 -- 30 19 871 176 1 <50 14 <br /> 9/11/1998 -- 4598 — — — — — — -- — -- — Well paved over <br /> 12/15/1998 NP 4611 8 86 3725 456 -- 102 069 612 809 <50 07 <br /> 3/17/1999 NP 46 11 855 3756 130 -- 212 0 528 212 271 <50 25 <br /> 5/14/1999 NP 46 11 881 3730 155 — 179 <0 5 20 2 <5 0 42 <br /> 9/16/1999 NP 4611 917 36 94 747 -- 278 142 988 84 <50 1 8 <br /> 12/22/1999 NP 4611 799 3812 648 -- <05 0 586 585 536 <2 50 031 <br /> 2/29/2000 NP 4611 818 3793 142 — 16 <0 5 239 136 <2 50 6 2 <br /> 617/2000 NP 4611 902 3709 576 -- 482 <0 500 843 <2 50 <12 5 -- <br /> 9/25/2000 NP 4611 987 3624 2,720 — 563 114 331 473 <50 0 — <br /> 12/29/2000 P 4611 838 3773 2,350 -- <5 00 <5 00 191 <5 00 <2 00* 51 <br /> 3/27/2001 P 4611 966 3645 <50 0 -- <0 500 <0 500 <0 500 <0 500 <2 00* 27 <br /> 6/20/2001 P 4611 899 3712 150 — <10 <1 0 15 29 <2 0* — <br /> 9/12/2001 P 4611 911 3700 810 -- 13 37 44 84 <2 5 17 <br /> 12119/2001 P 46 11 878 3733 380[1] — 0 81 <0 50 25 1 5 21* 048 <br /> 3/14/2002 P 4611 880 3731 170 — <0 50 <0 50 071 <0 50 <0 50* 072 <br /> 6/28/2002 P 4611 910 3701 260 — 079 056 27 <G5 0 82* 1 <br /> 9/11/2002 P 4611 914 3697 150 — 3 07 42 14 0 73* 23 <br /> 12/17/2002 P 4611 833 3778 420 -- <20 <2 0 64 76 17* 14 <br /> 03/31/2003 P 4598 875 3723 260 — <0 50 <0 50 056 <0 50 1 l* 080 <br /> 06/09/2003 P 4598 881 3717 220 -- <0 50 061 J 19 <0 50 <0 50* 43 <br /> 09118/2003 P 4598 892 3706 230 -- 058 <0 50 050 <0 50 2 3* 16 <br /> 12/24/2003 P 4598 878 3720 140 — <0 50 <0 50 <0 50 <0 50 3 0* 19 <br /> 03/12/2004 P 1804 879 925 240 -- <0 50 <0 50 <0 50 070 <0 50* 18 <br /> 06/0112004 P 1804 8 92 912 1 260 L — <0 50 1 <0 50 1 <0 50 1 <0 50 1 <0 50* 16 <br /> ATR-9 110/16/199011 4868 -- -- <50 1 -- 1 <05 1 <0 5 1 <0 5 1 <0 5 1 -- -- <br /> 10/19/199011 4868 11 11 3757 — - -- — - - -- - <br /> Report Date July 15,2004 Page 16 of 26 <br />