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Table 1 Groundwater Elevation and Analytical Data ARCO Service Station#2133 2908 Benjamin Holt Drive Stockton, California Well Depth Product Groundwater Groundwater Ethyl- Xylenes Well Date Elevation to Water Thickness Elevation Elevation TPHg Benzene Toluene benzene (total) MtBE DO Number Sampled (ft,MSL (ft,TOC) ((ft) (ft,MSL) Change(ft) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (mg/L) PR-1 9/29/1994 1609 -- -1529 -1 11 <50 <0 5 <0 5 <0 5 <0 5 (cont) 12/8/1994 1566 -- -1486 043 <50 <0 5 <0 5 <0 5 <0 5 3/8/1995 1347 -- -1267 219 <50 <0 5 <0 5 <0 5 <0 5 8/1/1995 1194 -- -11 14 153 <50 <0 5 <0 5 <0 5 <0 5 9/11/1995 1382 - -1302 -188 <50 <0 5 <0 5 <0 5 <0 5 12/5/1995 1422 -- -1342 -040 -- - - _ 3/18/1996 1005 -925 417 <50 <0 5 <0 5 <0 5 <0 5 6/18/1995 1023 - -943 -018 -- - - - _ _ 9/25/1996 1255 -- -1175 -232 <50 <0 5 <0 5 <0 5 <0 5 <5 12/4/1996 1205 -• -1125 050 - - - - 3/19/1997 NP 804 -- -724 401 <50 <0 5 <0 5 <0 5 <0 5 - 03 6/5/1997 NP 9 27 -847 -123 <50 <0 5 <0 5 <0 5 <0 5 <5 0 9 8/19/1997 NP 1076 -996 -149 <50 <0 5 <0 5 <0 5 <0 5 <5 0 3 11/25/1997 NP 1109 -- -1029 -033 <50 <0 5 <0 5 <0 5 <0 5 <5 3/19/1998 P 458 - -378 651 <50 <0 5 <0 5 <0 5 <0 5 <5 21 6124/1998 Well box inaccessible 9/10/1998 NP 848 -768 -- <50 <0 5 <0 5 <0 5 <0 5 <5 - 12/17/1998 NP 847 -- -767 001 <50 <0 5 <0 5 <0 5 <0 5 <5 3/10/1999 P 632 -552 215 <50 <0 5 <0 5 <0 5 <0 5 <5 47 6/22/1999 NP 813 -- -733 -1 81 <50 <0 5 <0 5 <0 5 <0 5 <5 2 9 9/13/1999 NP 984 -- -904 -171 <50 <0 5 <0 5 <05 <0 5 <5 25 12/1611999 NP 973 -893 Oil <50 <0 5 <0 5 <0 5 <0 5 <2 5 47 3/23/2000 P 520 -- -440 453 <50 <0 5 <0 5 <0 5 <0 5 <2 5 26 6/21/2000 P 691 - -611 -1 71 <50 <0 5 <0 5 <0 5 <0 5 <2 5 4 6 9/13/2000 NP 912 -- -832 -221 <50 <0 5 <0 5 <05 <0 5 <2 5 1 32 12/15/2000 P 863 - 783 049 <50 0 <0 500 <0 500 <0 500 <0 500 <2 50 1 06 3/2/2001 P 698 -- -618 165 <50 0 <0 500 <0 500 <0 500 0 502 <2 50 41 5/10/2001 Well inaccessible Projects/ARCO/2133/Reports/Tables/gwtables2133 xis 26