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• TabI0 Pag16540 Groundwater Elevation and Analytical Data ARCO Service Station#2133 2908 Benjamin Halt Dr,Stockton,California 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) mg/l 6/22/1999 -- 902 -669 -1 95 - - 0 6 E 4 9/13/1999 NP 1077 -- -8 44 -1 75 107 <0 50 <0 50 0 738 <0 50 853 2 3 (cont) 12/15/1999 -- 1065 -632 012 - -- 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 - - - 0 88 9/13/2000 NP 1000 -- 767 -179 <50 <0 50 <0 50 <0 50 <0 50 <2 50 1 50 12/15/2000 948 — -715 052 -- 071 E 5 8/26/1988 245 -- - 2,690 390 270 870 j 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 17 32 -1487 019 - 2/15/1990 1729 - -1484 0 03 - 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 0 04 6/5/1990 17 57 - -1512 0 04 - 6/19/1990 1849 -1604 092 2,150 30 200 780 7/12/1990 1837 - -1592 012 - 8/16/1990 1865 -1620 028 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 003 - - - 4/23/1991 1787 1542 072 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 092 28,000 4,300 130 560 1,700