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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,TQC) (ft) ft,MSL) Change(ft) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (mg/L) PR-2 3/23/2000 P 433 -368 469 <50 <0 5 <05 <0 5 <0 5 <25 35 (cont) 6/21/2000 861 -- -796 -428 - -- - -- - 22 9/13/2000 NP 836 -771 025 <50 <05 <0 5 <0 5 <0 5 <2 5 1 29 12/15/2000 785 - -720 051 -- -- - -- -- 1 43 3/212001 P 573 -508 212 <50 0 <0 500 <0 500 <0 500 110 <250 42 5/10/2001 583 -- -518 -010 -- - - -- -- - 21 8/22/2001 P 864 -799 -281 <50 <0 50 <0 50 <0 50 <0 50 <2 5 12/5/2001 771 -706 0 93 - - - __ __ _ 3112/2002 P 612 -- -547 1 59 <50 <050 <0 50 <0 50 <0 50 <2 5 1 75 6/6/2002 694 -- -629 -082 -- - - -- -- - 1 70 9/24/2002 P 880 -- -815 -1 86 72" <0 50 <0 50 064 <0 50 82 1 75 12/17/2002 684 -- -619 1 96 -- -- - -- __ _ _ 3/18/2003 P 686 — -621 -002 <50 <050 <0 50 <050 <0 50 <2 5 1 18 BHD-1 8/26/1988 058 -- - -- -- - 6,050 220 2,000 1,000 - 11/28/1988 - -• 1,870 <100 480 100 2/27/1989 -- - 5/30/1989 -- - -- 2,900 120 870 780 8/22/1989 - -- 1,450 300 890 1170 12/4/1989 -- - -- -- 1,400 170 1,600 2,800 1/4/1990 1570 -- -1512 -- - -- 211/1990 1542 - -1484 028 - 2/15/1990 1539 - -1481 003 - V22/1990 1622 - -1564 -083 - -- _ _ 3/8/1990 1517 -- -1459 1 05 1,250 50 1 870 1 360 4/5/1990 1538 -1480 021 - -- - _ 4/19/1990 1558 -1500 020 5/10/1990 1592 1534 -034 5/24/1990 1589 - -1531 003 - _ 6/5/1990 6/18/1990 1637 - -1579 - 1180 40 2070 860 7/12/1990 1660 -1602 -023 - - _ 8/16/1990 1789 -- -1731 -129 - _ 9/1711990 1724 -1666 065 - - Prolects/ARCO/2133/RepoftfTables/gwtables2133 As 29