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Table 1 Groundwater Elevation and Analytical Data ARCO Service Station #2133 2908 Benjamin Halt Drive Stockton, California Well Depth Product Groundwater Groundwater Ethyl- Xylenes Well Date Elevation to Water Thickness Elevatlon Elevation TPHg Benzene Toluene benzene (total) MtBE 00 Number Sampled (ft,MSL) ft,TOC) (ft) (ft,MSL) Change(ft) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (mg/L) E 6 6/18/1996 990 -849 052 -- - . (cont) 9/25/1996 1262 -1121 272 3,700 42 <5 120 99 <50 12/4/1996 1204 -- -1063 058 -- - -- - - 3/19/1997 NP 756 -615 448 <50 <0 5 <0 5 <0 5 <0 5 02 6/5/1997 P 919 -778 -163 -- -- - -- __ _ 0 3 8/19/1997 NP 1057 -- -916 -138 200 24 091 27 26 24 0 3 11/25/1997 P 1083 -- -942 -026 -- -- _ _ _ 3/1911998 NP 537 -- -396 546 <50 <05 <0 5 <0 5 <0 5 13 2 3 6/24/1998 662 -521 -125 - -- _ _ _ 9/10/1998 NP 841 - -700 -179 <50 107 0 742 <05 121 <50 12/17/1998 835 - -694 006 - -- - _ _ 3/10/1999 NP 626 -485 209 <50 <05 <0 5 <0 5 <0 5 <5 0 68 6/22/1999 830 - -689 -204 -- - 2 4 9/13/1999 NP 1001 -- -860 -171 <50 0 837 <0 5 <0 5 0 923 <5 0 1 8 12/15/1999 985 - -844 016 - - - 68 3/23/2000 P 521 - -380 464 107 <0 5 <0 5 <0 5 <0 5 <2 50 55 6/21/2000 763 -612 -232 -- - -- 08 9/13/2000 NP 926 -- -785 -173 <50 <0 5 <05 <0 5 <0 5 <2 50 1 28 12/15/2000 870 -- -729 056 -- -- -- -- -- - 263 3/1/2001 P 679 -- -538 1 91 <50 0 <0 500 <0 500 <0 500 0 600 631 37 5/10/2001 680 - -539 -001 - -- - - - 3 0 8/22/2001 P 952 -811 -272 99 066 0 60 <0 50 <0 50 3 8 - 12/5/2001 855 -714 097 -- - _ - 3/11/2002 P 689 -548 166 <500 <50 <5 0 <5 0 <5 0 270 1 63 6/6/2002 776 -- -635 -087 -- - -- - - 0 64 9/24/2002 P 965 -- -824 -189 <50 <0 50 <0 50 <0 50 <0 50 43 029 12/17/2002 7 83 - -642 182 -- -- -- 3/18/2003 P 786 — -645 -003 <50 <0 50 <0 50 <0 50 <0 50 <2 5 1 08 E-7 8/26/1988 116 -- - -- _ 11/28/1988 _. 2/27/1989 -- -- 368 <0 5 <0 5 0 7 - 5/30/1989 8/22/1989 -- -- 1 5 05 <0 5 <0 5 Projects/ARCO/2133/Reports/Tables/gwtables2133 As 11