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Table 1 Page 6 of 30 Groundwater Elevation and Analytical Data ARCO Service Station 42133 2908 Benjamin Holt Or,Stockton California I Well Depth Product Groundwater Groundwater Total Date Elevation to Water thickness, Elevation Elevation change TPH G Benzene Toluene Ethylbenzene Xylenes MTBE DO Sampled (feet,MSL) (feet,TOC) in feet (feet,MSL) (feet) (ppb) {ppb} (ppb) (ppb) (ppb) (ppb) mgll 6/22/1999 - 902 669 1 95 - 0 6 E 4 9/13/1999 NP 1077 - -844 175 107 <0 50 <0 50 0 738 <0 50 8 53 23 (cont) 12/15/1999 1066 -832 0 12 - 1 1 3/23/2000 NP 5 97 -- -364 4 68 <50 <0 50 <0 50 <0 50 <0 50 <2 50 1 7 6/21/2000 - 821 -588 -224 - 088 9/13/2000 NP 1000 -767 -1 79 <50 <0 50 <0 50 <0 50 <0 50 <2 50 1 50 12/15/2000 948 -- -715 0 52 - 0 71 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 17 51 -- -1506 -- - 2/1/1990 1732 -- -1487 0 19 - 2/15/1990 1729 -1484 003 - 2/22/1990 1907 -1662 -1 78 - 3/8/1990 1703 -1458 204 272 394 97 8 532 4/5/1990 1731 - -1486 -028 4/19/1990 1726 - 14 81 005 - 5/10/1990 1765 -- 1520 -039 5/24/1990 1761 -- -1516 004 - 6/5/1990 1757 -- -1512 0 04 - 6/19/1990 1849 -- -1604 -0 92 2,150 30 200 780 7/12/1990 1837 -- -15 92 0 12 -- - 8/16/1990 1865 1620 -0 28 - 9/17/1990 1901 -- 1656 -036 - - 9/18/1990 1901 - -1656 000 30,000 7,400 210 860 8,300 10/11/1990 1911 - -1666 -010 -- - - 12/6/1990 1895 -1650 016 - - 2/14/1991 1862 -1617 033 18,000 6,300 120 560 4,300 2/25/1991 1859 -1614 0 03 - 4/23/1991 1787 -- -1542 0 72 10,000 8,400 <0 50 270 680 7/15/1991 Dry -- - - - - 10/8/1991 Dry -- - 1/22/1992 1923 -1678 - - - 4/22/1992 1831 -1586 0 92 28,000 4,300 130 560 1 700