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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) PR-1 8/22/1989 - -- -- <0 5 <0 5 <0 5 <0 5 (cant) 12/4/1989 -- __ - <03 <0 3 <0 3 0 4 1/4/1990 1641 -- -1561 - -- __ _ 2/1/1990 1614 -- -1534 027 2/15/1990 1612 -1532 002 2/22/1990 1694 - -1614 -082 -- 3/8/1990 1590 -1510 1 04 <05 <0 5 <0 5 <0 5 4/5/1990 1606 -1526 -016 - 4/19/1990 1612 -- -1532 -006 5/10/1990 1659 -- -1679 -047 5/24/1990 1657 -1577 002 6/5/1990 -- -- -- 6/18/1990 1695 - -1615 -- <0 5 <0 5 <0 5 <0 5 7/12/1990 1736 -- -1656 -041 -- 8/16/1990 1762 -- -1682 -026 -- -- 9/17/1990 1793 — -1713 -031 <50 <0 5 <0 5 <0 5 <0 5 9/19/1990 1793 -- -1713 000 <50 <05 <0 5 <0 5 <0 5 10/11/1990 1798 -- -1718 -005 - -- -- _ 12/6/1990 1783 -- -1703 015 - -- -- - 2/11/1991 1753 -- -1673 030 <50 <05 <0 5 <0 5 <0 5 2/25/1991 1747 -- -1667 006 -- - - 4/23/1991 1653 -- -1573 094 <50 <0 5 <0 5 <0 5 <0 5 7/16191 1818 -- -1738 -165 <50 <0 5 <0 5 <0 5 <0 5 10/8/1991 1863 -1783 -045 <50 <0 5 <0 5 <0 5 <0 5 1/22/1992 1749 -- -1669 1 14 <50 <0 5 <0 5 <0 5 <0 5 4/22/1992 1690 -- -1610 059 <50 <0 5 <0 5 <0 5 <0 5 7/29/1992 1840 -- -1760 -1 50 <50 <0 5 <0 5 <0 5 <0 5 10/29/1992 1884 -1804 -044 <50 <0 5 <0 5 <0 5 <0 5 1/27/1993 1616 -1536 268 <50 <05 <0 5 <0 5 <0 5 4/29/1993 1412 -- -1332 204 <50 <0 5 <0 5 <0 5 <0 5 8/5/1993 1548 -- -1468 -136 <50 <0 5 <0 5 <0 5 <0 5 11/10/1993 1594 -- -1514 -046 <50 <0 5 <0 5 <0 5 <0 5 3/21/1994 1462 -1382 1 32 <10 <0 3 <0 3 <0 3 <0 5 6/27/1994 1498 -- -1418 -036 <10 <0 3 <0 3 <0 3 <0 5 Projects/ARCO/2133/Reports/Tables/gwtables2133 xis 25