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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-12 3/8/1990 1647 -1451 109 917 164 3 145 (cont) 415!1990 1664 -1468 -017 - -- _ -- 4/19/1990 1666 -- -1470 -002 5/10/1990 -- — -- -- 5/24/1990 1705 -- -1509 6/5/1990 1703 — -1507 002 - - -- __ 6/19/1990 1780 -- -1584 -077 151 47 29 76 7/12/1990 1787 — -1591 -007 - - _ 8/16/1990 -- -- -- 9/17/1990 1848 -- -1652 - - - _ 9/19/1990 1848 -1652 000 1,100 180 29 98 32 10111/1990 1857 -- -1661 -009 -- -- - -- 12/6/1990 1843 -- -1647 014 - -- - _ 2/12/1991 1810 -1614 033 500 21 58 12 20 2/25/1991 1808 -1612 002 - -- - -- - 4/23/1991 1710 -- -1514 098 <50 69 <0 5 <0 5 <0 5 7/16191 1974 -- -1778 -264 320 11 <0 5 <0 5 0 9 10/8/1991 2029 -- -1833 -055 210 45 <0 5 <0 5 <1 0 1/22/1992 1856 -- -1660 173 630 29 1 3 <2 5 08 4/22/1992 1769 -- -1573 087 660 43 <32 09 21 7/29/1992 1918 - -1722 -149 830 18 29 27 54 10/29/1992 1955 -- -1759 -037 400 67 <0 5 13 27 1/27/1993 1626 -- -1430 329 380 1 5 25 1 2 <1 4/29/1993 1443 -1247 183 520 27 <2 <1 <2 8/5/1993 1608 1412 -165 830 06 <05 1 6 22 11/10/1993 1622 -- -1426 014 280 <0 7 27 <2 4 1 7 3/21/1994 15 77 -1381 045 200 20 1 2 1 8 61 6/27/1994 1560 -- -1364 017 220 08 <0 3 03 <0 5 9/29/1994 1668 -1472 -108 330 <0 5 <0 5 <0 5 0 8 12/8/1994 1626 -- -1430 042 150 <0 5 1 0 1 0 21 3/8/1995 1380 -- -1184 246 200 <0 5 <1 <0 5 1 8 6/1/1995 1232 — -1036 148 <50 <0 5 <0 5 <0 5 <0 5 9/11/1995 1370 — -1174 -138 <50 <0 5 <0 5 <0 5 <0 5 12/5/1995 1488 -1292 -1 18 <50 <0 5 <0 5 <0 5 <0 5 Projects/ARCO/2133/Reports/rables/gwtables2133 x1s 23