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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 P/ Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO <br /> Number Sampled NP (feet msl) (feet bgs) (feet msl) (Erg1L) (pg/L) WIL) (pg/L) (1rg1L) (pgll-) (rg1L) (mg/L) Comments <br /> ATR-8 2/29/2000 NP 4611 818 3793 142 — 16 <05 239 136 <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 /> 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 — <1 0 <1 0 15 29 <2 0* — <br /> 9/12/2001 P 4611 911 3700 810 — 13 37 44 84 <2 5 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 260 -- 079 056 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 1 7* 14 <br /> 03/31/2003 P 4598 875 3723 260 -- <0 50 <0 50 056 <0 50 1 1* 08 <br /> 06/09/20031 P 4598 881 3717 220 — <0 50 061 J 1 9 <0 50 <0 50* 43 <br /> 09/1812003 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 /> 0 3/1 212 004 P 1804 879 925 240 — <0 50 <0 50 <0 50 070 <0 50* 1 8 <br /> 06/01/2004 P 1804 892 912 260 — <0 50 <0 50 <0 50 <0 50 <0 50* 1 6 <br /> 09/20/2004 P 1 1804 1 910 894 <50 -- <0 50 <0 50 <0 50 <0 50 19* 12 <br /> 92/13/2004 P 1 1804 896 908 93 - <0 50 <0 50 <0 50 <0 50 1 3* 10 <br /> 03102!2005 P 18 04 847 957 92 -- <0 50 <0 50 1 <0 50 <0 50 <0 50* 47 <br /> ATR-9 10/16/1990 4868 -- -- <50 _ <05 <05 <0 5 <0 5 — — <br /> 10/19/1990 4868 11 11 3757 -- -- — _ .. _ <br /> 1/10/1991 -- 4868 1104 3764 <50 -- <05 <05 <0 5 <0 5 -- -- <br /> 4/10/1991 4868 1082 3786 <50 — <0 5 <0 5 <0 5 <0 5 -- <br /> 7/10/1991 — 48 68 1106 3762 <50 -- <0 5 1 <0 5 <0 5 <0 5 — -- <br /> 9/24/1991 4868 11 29 3739 — -- -- — .- — <br /> 9/25/1991 - 4868 — — <50 .- <0 5 <0 5 <0 5 <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 -- <0 5 <0 5 <0 5 <0 5 — -- <br /> 7/8/1992 — 4868 1106 3762 <50 -- <0 5 <0 5 <0 5 <0 5 — - <br /> 10/7/1992 -- 4868 i 11 16 37 52 <50 — <05 <0 5 <05 <0 5 — - <br /> Report Date March 21,2005 Page 17 of 27 <br />