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• Papof 33 Table 1 Groundwater Elevation and Analytical Data ARCO Service Station#2133 2908 Benjamin Holt Dr,Stockton,CA Well Depth Product Groundwater Groundwater Xylenes Well Date Elevation to Water Thickness Elevation Elevation TPHg Benzene Toluene Ethylbenzene (total) MtBE DO Number Sampled (ft,MSL) (ft,TOC) (ft) (ft,MSL) Change(ft) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (mg/L) BHD-1 6124198 P 592 -- -534 -147 5,500 37 <10 170 46 580 30 (cont) 9110/98 NP 812 -754 -220 349 319 <0 500 0 542 <0 500 567 - 12/17/98 P 770 -- -712 042 1,000 252 <1 0 109 368 627 - 3/10/99 P 655 -- -597 1 15 432 102 <0 500 1 59 173 263 23 6122/99 NP 813 -- -755 -158 162 <0 5 <0 5 <0 5 <0 5 728 08 9/13199 NP 928 -- -870 -1 15 420 <0 5 <0 5 0 956 <0 5 1,410 12 12/16/99 Well box inaccessible 3123100 P 465 -- -407 -- 559 <0 5 <0 5 137 0 627 <2 5 09 6/21/00 P 642 -- -584 -177 895 133 <0 5 <05 <05 175 01 9/13/00 NP 837 -- -779 -195 176 498 0 806 1 10 1 17 1,010 20 12/15/00 P 793 - -735 044 <50 0 <0 500 <0 500 <0 500 <0 500 505 073 3/2101 Well inaccessible 5110/01 P 583 -- -525 - 101 0 788 <0 500 1 33 125 639 14 81=1 P 863 -- -805 -280 <500 <5 0 <5 0 <5 0 <5 0 850 — BHD-2 8126188 073 -- -- — -- - - - -- 11/28188 -- -- -- - - - -- - 2/27/89 -- -- - -- - 5130/89 .. .. -- -- -- -- 8122/89 -- - <0 5 <0 5 <0 5 <0 5 - 1214/89 -- -- - -- -- 1/4/90 -1/4/90 1622 -- -1549 2/1190 -- 2/15/90 2/15/90 -- -- -- - - 2/22/90 -- -- -- - - -- 3/8/90 1578 1505 - <0 5 <0 5 <0 5 <0 5 4/5/90 1585 -- -1512 007 - -- 4/19/90 1592 -- -1519 -007 - 5/10/90 1657 - -1584 -065 5/24/90 1654 -- -1581 003 - -" I 6/5/90 -- -- - - 6/18/90 1663 -- -1690 - -- - - - 7/12190 1703 -- -1630 -040 - 8/16190 1721 -- -1648 -018 - -- -- -- '" 9/17190 1770 - -1697 -049 - <0 5 <0 5 <0 5 <05 -- 10/11/90 1778 -- -1705 -008 -- -- -- Prolects/ARCO/2133/Reports/Tables/gwtables2133 As