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f • i 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) it,TOC) (ft) ft,MSL) Change(ft) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (mg/L) BHS-1 9/10/1998 NP 812 -- -754 -220 349 319 <0 500 0 542 <0 500 567 (cont) 12/17/1998 P 770 - -712 042 1,000 252 <1 0 109 368 627 3/10/1999 P 655 -- -597 1 15 432 102 <0 500 159 173 263 23 6/22/1999 NP 813 -755 -158 162 <0 5 <0 5 <0 5 <0 5 728 0 8 9/1311999 NP 928 -870 -115 420 <G5 <0 5 0 956 <0 5 1410 1 2 12/16/1999 Well box inaccessible 3/23/2000 P 465 -407 - 559 <0 5 <0 5 1 37 0 627 <2 5 0 9 6/21/2000 P 642 - -584 -177 895 1 33 <05 <0 5 <0 5 175 01 9/13/2000 NP 837 -- -779 -195 176 498 0 806 1 10 117 1,010 20 12/15/2000 P 793 -- .735 044 <50 0 <0 500 <0 500 <0 500 <0 500 505 073 3/2/2001 Well inaccessible 5/10/2001 P 583 -525 -- 101 0 788 <0 500 1 33 1 25 639 1 4 8/22/2001 P 863 -- 805 -280 <500 <5 0 <50 <5 0 <5 0 850 12/5/2001 P 808 -- -750 055 <500 <50 <50 <5 0 <5 0 470 1 84 3/12/2002 P 605 -- -547 203 <500 <50 <5 0 <5 0 <5 0 430 093 6/6/2002 P 703 -645 -098 95' <050 <0 50 <0 50 <0 50 170 022 9/24/2002 P 892 -834 -189 500" 37 089 6 4 090 290 029 12/17/2002 P 786 -- -728 106 72 <0 50 <0 50 <0 50 <0 50 78 3/18/2003 P 708 — -650 0 76 69 <050 <0 50 <0 50 <0 50 97 102 BHD-2 8/26/1988 0 73 -- -- -- 11/28/1988 .11/28/1988 _ 2/27/1989 _ 5/30/1989 8/22/1989 -- <0 5 <0 5 <0 5 <0 5 12/4/1989 _ 1/4/1990 1622 -- -1549 _ 2/1/1990 -- - -- - 2/15/1990 2/22/1990 -- 3/8/1990 1578 -1505 -- <0 5 <0 5 <0 5 <0 5 4/5/1990 1585 - -1512 -007 __ -- 4/19/1990 1592 - -1519 -007 5/10/1990 1657 -1584 -065 Projects/ARCO/2133/Reports/7ables/gwtabies2l33 As 31