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Table 1 Groundwater Elevation and Analytical Data ARCO Service Station 92133 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-2 2122190 1630 -- -1565 -081 - - -- -- -- (cont) 318190 1528 -1463 102 <0 5 <0 5 <0 5 <0 5 -- 4/5/90 1542 -1477 014 - -- - -- -- 4/19/90 1650 -1585 108 -- - - 5/10190 1589 -1524 061 - - 5/24/90 1588 -1523 001 615190 -- - -- -- 6/18/90 1642 -- -1577 -- 7/12J90 7/12190 16 63 -1598 021 -- 8/16/90 1732 -1667 -069 - 9/17/90 1765 - 1700 -033 -- -- -- -- - - 9/19/90 1765 -1700 000 <50 <0 5 <05 <0 5 <05 - 10/11/90 1729 -1664 036 -- -- -- -- -- 1216/90 1714 -1649 015 -- -- -- - -- 2/11/91 -2/11/91 1682 -16V 7 0 32 <50 <0 5 <0 5 <0 5 <0 5 - 2/25/91 1678 - -1613 004 -- -- -- -- -- 4123/91 1584 -1519 0 94 -- -- -- -- -- 7/16/91 1822 - -1757 238 <50 <0 5 <0 5 <0 5 <0 5 1018/91 1882 -1817 060 -- -- -- -- - 1/22/92 1717 - -1652 1 65 <50 <0 5 <05 <0 5 <05 - 4/22192 1629 -1564 088 <50 <0 5 <05 <0 5 <0 5 7129192 1789 -1724 160 <50 <0 5 <05 <0 5 <05 10/29/92 1831 - -1766 042 <50 <0 5 <0 5 <0 5 <0 5 -- 1/27/93 1499 -1434 332 <50 <0 5 <0 5 <0 5 <0 5 4/29/93 1319 -1254 1 80 <50 <0 5 <0 5 <0 5 <0 5 8/5/93 1477 -1412 1 58 <50 <0 5 <0 5 <0 5 <0 5 11/10/93 1483 -- -1418 006 <50 <0 5 <0 5 <05 <0 5 3/21/94 1430 - -1365 053 <10 <0 3 <0 3 <0 3 <0 5 6/27/94 1422 -1357 008 <10 <0 3 <03 <0 3 <0 5 9/29/94 1541 - -1476 -1 19 <50 <0 5 <0 5 <0 5 <0 5 12/8/94 1506 -1441 035 <50 <0 5 <0 5 <0 5 <0 5 3/8/95 1255 -11 90 251 <50 <0 5 <0 5 <0 5 <0 5 6/1/95 11 09 - 1044 1 46 <50 <0 5 <0 5 <0 5 <0 5 9/11/95 1326 1261 -217 <50 <0 5 <05 <0 5 <0 5 - Projects/ARCO/2133/Reports/Tables/gwtables2133 As 27