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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) E 4 3/10/1999 NP 707 -474 222 <50 <0 50 <0 50 <0 50 <0 50 <5 0 3 0 (cant) 6/22/1999 902 -669 -195 -- -- -- - -- 06 9/13/1999 N P 1077 -- -844 -175 107 <0 50 <0 50 0 738 <0 50 853 23 12/15/1999 1065 -832 012 -- -- - 1 1 3/23/2000 NP 597 -- -364 468 <50 <0 50 <050 <0 50 <0 50 <2 50 1 7 6/21/2000 821 -- -588 -224 -- - -- -- 088 9/13/2000 NP 1000 - -767 -179 <50 <0 50 <0 50 <0 50 <0 50 <250 1 50 12!15/2000 948 -715 052 - -- - - 0 71 3/1/2001 P 740 -- -507 208 777 224 <5 00 351 108 603 2 8 5/10/2001 751 -- -518 -011 -- - 2 5 8/20/2001 P 1027 794 276 720 14 36 28 69 39 12/5/2001 941 708 086 -- _ 3/11/2002 P 764 -- -531 1 77 680 97 1 4 23 41 45 1 88 6/6/2002 8 60 -- -627 -096 -- - -- -- - - 0 76 9/24/2002 P 1043 -810 -183 150' 064 1 2 <0 50 077 23 058 12/17/2002 864 -- -631 179 - -- _ 3/18/2003 P 858 — -625 006 <50 <0 50 <050 <0 50 <0 50 <2 5 1 07 E-5 8/26/1988 2 45 -- -- -- - - 2 690 390 270 870 11/28/1988 -- -- - 580 140 110 420 2/27/1989 -- -- -- 1,770 200 200 1,400 5/30/1989 -- - 2,430 36 260 1,670 8/22/1989 -- -- -- - 3,110 130 240 1,720 12/4/1989 -- -- -- - 600 40 120 1,030 1/4/1990 1751 -1506 -- 2/1/1990 1732 -1487 019 _ 2/15/1990 1729 -1484 003 2/22/1990 1907 -- -1662 -178 - 3/8/1990 1703 - -1458 204 272 394 978 532 4/5/1990 1731 1486 -028 __ - 4/19/1990 1726 -1481 005 5/10/1990 17 65 -1520 039 5/24/1990 1761 - -1516 004 6/5/1990 1757 -- -1512 004 Projects/ARCO/2133/ReportslTables/gwtables2133 xis 7