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Table 1 <br /> Groundwater Elevation and Analytical Data <br /> ARCO Service Station No 2093 <br /> AOL 3425 Tracy Boulevard Tracy California <br /> Well Depth Groundwater Groundwater Product Ethyl- Xylenes <br /> Well Date Elevation to Water Elevation Elevation Thickness TPHg Benzene Toluene benzene (totan MtBE DO <br /> Number Sampled (ft,MSL) ft,TOC) (ft,MSL) Change(ft) (ft) ("WL) WgAL) (p9LL) iyg/L) O g/L) (mg/L) <br /> ATR 10 10/16/1990 4807 - <50 <0 5 <0 5 <0 5 <0 5 - <br /> 10/19/1990 1020 3787 - - - - - - <br /> 1/10/1991 1007 38 00 0`13 <50 <0 5 <0 5 <0 5 <0 5 - <br /> 4/10/1991 1000 3807 007 - <50 <0 5 <0 5 <0 5 <0 5 - - <br /> 7/12/1991 1021 3786 -021 - <50 <0 5 <0 5 <0 5 <0 5 - <br /> 9/24/1991 1032 3775 -011 - - - - -- - <br /> 9/25/1991 - -- - <50 <0 5 <0 5 <0 5 <0 5 <br /> 1/23/1992 1000 38 07 -- - <50 <0 5 <0 5 <0 5 <0 5 <br /> 4/20/1992 1001 3806 0 01 - - - - -- <br /> 4/21/1992 <br /> -4/21/1992 - - - - <50 <O 5 <0 5 <0 5 <0 5 - <br /> 7/8/1992 1017 3790 - - <50 <0 5 <0 5 <0 5 <O 5 <br /> 10/7/1992 1023 3784 -0 06 - <50 <0 5 <O 5 <O 5 <0 5 -- - <br /> 1/18/1993 961 3846 062 - <50 <0 5 <0 5 <0 5 <05 - - <br /> 4/14/1993 994 3813 -033 - <50 <0 5 <0 5 <0 5 <0 5 - <br /> 8/30/1993 1023 37134 -029 - <50 <0 5 <0 5 <0 5 <0 5 <br /> 10/27/1993 1024 3783 -001 <50 <0 5 <0 5 <0 5 <0 5 <br /> 2/18/1994 1002 38 05 022 - <10 <0 3 04 <0 3 <0 5 - - <br /> 5/20/1994 1009 37 98 -0 07 <10 <0 3 <0 3 <0 3 <0 5 - <br /> 10l7/1994 1024 3783 -015 <50 <0 5 <0 5 <D5 <0 5 <br /> 12/16/1994 997 3810 027 - <50 <0 5 <0 5 <0 5 <0 5 - - <br /> 2/28/1995 1015 3792 -018 <50 <0 5 <0 5 <0 5 <0 5 - <br /> 425/1995 1027 37 80 012 <50 <0 5 <0 5 <0 5 <0 5 <br /> 727/1995 1038 3769 -011 - - - <br /> 10/26/1995 1041 3766 -003 - - - - <br /> 2/12/1996 1001 3806 040 <50 <0 5 <0 5 <0 5 <05 <br /> 4/18/1996 1023 3784 -022 - - - - - -- <br /> 7/18/1996 1040 3767 -017 - <50 <0 5 <0 5 <0 5 <0 5 <5 0 <br /> 11/15/1996 1093 3714 053 - - - - - <br /> 3/14/1997 - -- - - - <br /> . 111/1 97 - - » » - - - <br /> 8l11l1997 NP 1056 37 51 <50 c0 5 c0 5 <0 5 <0 5 <2 5 <br /> 11/17/1997 1047 3760 009 <br /> 3/30/1998 NP 1005 3802 042 <50 c0 5 <0 5 <0 5 <05 <5 0 2 3 <br /> 625/1998 1025 3782 -020 - - - - -- - - <br /> 9/11/1998 NP 1035 3772 -010 - <50 <0 5 <0 5 <O 5 <0 5 <2 5 1 43 <br /> 12/15/1998 1021 3786 014 - - - - - - 06 <br /> 3/17/1999 NP 1011 3796 010 - <50 <0 5 <0 5 <0 5 <0 5 <5 0 1 3 <br /> 5/14/1999 10 31 3776 -020 - - - - - - 1 7 <br /> 9/16/1999 NP 1044 3763 -0113 <50 <0 5 <0 5 <0 5 <0 5 <5 0 39 <br /> 1222/1999 1035 3772 009 - - -- -- - - 1 54 <br /> 2/29/2000 NP 1003 3804 0 32 <50 <0 5 <0 5 <0 5 <0 5 <2 5 51 <br /> 6/72000 NP 1035 3772 O 32 - - - - -- -- -- <br /> 925/2000 NP 1045 3762 010 - <50 <0 5 <0 5 <0 5 <0 5 <2 5 0 6 <br /> 12212000 1030 3777 015 -- - - -- - - 71 <br /> 3272001 P 1022 3785 008 <50 0 <0 5 <0 5 <0 5 <0 5 <2 00` 2 3 <br /> 620/2001 1081 3726 -0 59 - - -- - - - - - <br /> 9/122001 Well inaccessible <br /> 12/192001 Well inaccessible <br /> 3/142002 Well inaccessible <br /> 6282002 - - - - - <br /> 9/112002 Well inaccessible <br /> 12/172002 - - - - - - - - - <br /> 3/312003' P 1012 3795 -- - <50 <0 5 <0 5 <0 5 <05 <0 5 1 5 <br /> 6/9/2003 1015 3792 0 03 - Not Sampled <br /> 9/182003 P 1060 3747 -045 <50 <0 5 <0 5 <0 5 <0 5 <0 5' 2 3 <br /> 12/24/2003 1044 3763 -019 -- Not Sampled <br /> K Mpme8gU5 BP ARCOW20931QimAwhA4 OTR 0312093 OWMFA 4003 Page 10 of 14 <br />