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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 Humber Sampled (ft,MSL) (ft,TOC) (ft) (ft,MSL) Change(ft) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (mg(L) E-9 3112102 P 702 - -546 181 230 48 <0 50 85 22 41 157 (cont) 6/6102 P 789 -633 -087 <50 <0 50 <0 50 <0 50 <0 50 <2 5 106 9124102 P 976 -820 -187 <50 <0 50 <0 50 <0 50 <0 50 <2 5 073 12/17/02 P 815 -- -659 161 76 <0 50 <0 50 19 23 25 - E-10 8126188 126 -- -- -- -- -- - - - -- 11/28/88 2,780 5,240 690 3,570 - - 2/27/89 2,970 3,020 750 5,030 5/30/89 5,520 5,760 1,060 6,900 8/22/89 2 590 3 220 570 5,200 12/4/89 -- -- - 1,300 1,200 400 3,200 1/4/90 1637 -1511 -- - - - -- 2/1/90 -211/90 1614 -1488 023 2/15/90 1612 -1486 002 -- 2122/90 1690 -1564 078 -- -- -- -- 3/8/90 1590 -- -1464 1 00 339 606 268 1,480 - 4/5/90 1606 - -1480 016 -- -- -- -- 4/19/90 1620 -1494 014 -- -- -- 5/10/90 - -- -- 5/24190 1642 -1516 - 6/5/90 1640 1514 002 -- - -- -- 6/19/90 1714 -1588 -074 3,510 3,180 790 6,490 7/12/90 1721 -1595 -007 -- -- - 8/16/90 1757 -1631 036 -- - -- - - - -- 9/17/90 1782 - -1656 025 -- -- -- -- -- - -- 9A 9/90 1782 -1656 000 20,000 36 39 <50 7,700 10/11/90 1794 -1668 012 -- -- -- -- -- 12/6/90 1778 -1652 016 -- -- - -- -- 2/12191 1747 1621 031 7,800 1,100 730 320 3,600 - - 2/25191 1741 -1615 006 -- -- -- -- - 4/23191 1656 -1530 085 8,200 670 180 200 750 - 7/16191 1911 -1785 -255 9,400 850 230 210 1,100 10/8191 1960 -1834 -049 8,700 860 150 260 820 - 1122/92 1824 - -1698 1 36 32,000 3,200 800 3,600 3,600 Projects/ARCO/2133/Reportsfrables/gwtables2133 AS 18