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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 /> TQC Depth to Water Level Ethyl- Total <br /> Well Date AI Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO <br /> Number Sampled NP (feet msl) (feet bgs) (feet msl) WWI-) (frglL) (pg/L) (pg/L) (pg/L) (pgll-) (aglL) (mg/L) Comments <br /> ATR-8 12/15/1998 NP 4611 886 3725 456 — 102 069 612 809 <5 0 07 <br /> 3/17/1999 NP 4611 855 3756 130 -- 212 0 528 212 271 <5 0 25 <br /> 5/14/1999 NP 4611 881 3730 155 - 179 <0 5 241 2 <50 42 <br /> 9/16/1999 NP 4611 917 3694 747 - 278 142 988 84 <5 0 18 <br /> 12122/1999 NP 4611 799 3812 648 — <0 5 0 586 585 536 <2 50 031 <br /> 2/29/2000 NP 4611 1 818 3793 142 — 16 <0 5 239 136 <2 50 62 <br /> 6/7/2000 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 /> 12129/2000 P 4611 838 3773 2 350 - <5 00 <5 00 191 <5 00 <2 00* 51 <br /> 3/27/2001 P 1 4611 966 3645 <50 0 — <0 500 <0 500 1 <0 500 <0 500 <2 00* 27 <br /> 6/20/2001 P 4611 899 3712 150 -- <1 0 <1 0 1 5 29 <2 0* -- <br /> 9/12/2001 P 4611 911 3700 810 — 1 3 37 44 84 <25 1 7 <br /> 12/19/2001 P 4611 878 3733 380[1] -- 081 <0 50 25 15 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 1 260 -- 079 056 1 27 <0 5 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 — <2 0 <2 0 64 76 17* 14 <br /> 03131/2003 P 4598 875 3723 260 — <0 50 <0 50 056 <0 50 1 1* 080 <br /> 06/09/2003 P 4598 881 3717 220 — <0 50 0 61 J 19 <0 50 <0 50* 43 <br /> 09/18/2003 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 /> ATR-9 10/16/1990 - 4868 -- -- <50 — <0 5 <0 5 <0 5 <05 — — <br /> 10/19/1990 -- 4868 11 11 3757 — — — -- — — -- -- <br /> 1/10/1991 — 4868 1104 37 64 <50 -- <0 5 <0 5 <0 5 <0 5 — — <br /> 4/10/1991 -- 4868 1082 3786 <50 <0 5 <0 5 <0 5 <0 5 — -- <br /> 7/10/1991 - 4868 1106 3762 <50 - <0 5 <0 5 <05 <0 5 -- — <br /> 9/24/1991 -- 4868 1129 3739 <br /> 9/25/1991 — 4868 — — <50 - <0 5 <0 5 <05 <0 5 — — <br /> 1/23/1992 — 4868 1096 3772 <50 — <0 5 <0 5 <0 5 <0 5 — -- <br /> 4/20/1992 -- 4868 1088 3780 — — -- _ _ <br /> 4/21/1992 -- 4868 -- -- <50 — <05 <0 5 <05 <0 5 — -- <br /> 7/8/1992 — 4868 11 06 3762 <50 — <05 <0 5 <0 5 <0 5 — — <br /> Report Date May 6,2004 Page 16 of 25 <br />