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Tab* Pagof 30 Groundwater Elevation and Analytical Data ARCO Service Station#2133 2908 Benjamin Holt Or,Stockton,California Well Depth Product Groundwater Groundwater Total Date Elevation to Water thickness, Elevation Elevation change TPH-G Benzene Toluene Ethy€benzene Xylenes MTBE DO Sampled (feet,MSL) (feet,TOC) In feet (feet,MSL) (feet) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) mg/l 6/18/1995 945 -- 880 -100 - 9/25/1996 1183 -- -11 18 -238 <50 <0 5 <0 5 <0 5 <0 5 <5 PR 2 12/4/1996 1129 -- 1064 054 - - (cont) 3/19/1997 P 683 -- -618 446 <50 <0 5 <0 5 <0 5 <0 5 2 3 6/5/1997 8 53 -7 88 -1 70 - 0 8 8/19/1997 NP 9 97 -932 -144 <50 <0 5 <0 5 <0 5 <0 5 <5 0 9 11/25/1997 P 1012 -947 -015 - - 3/19/1998 P 3 92 - -327 6 20 <50 <0 5 <0 5 <0 5 <0 5 <5 6 7 6/24/1998 5 91 -526 1 99 - - - 9/10/1998 P 757 -- -692 -1 66 <50 <0 5 <0 5 <0 5 <0 5 <5 12/17/1998 7 69 - -704 -012 - L 3/10/1999 P 5 63 -498 206 <50 <0 5 <0 5 <0 5 <0 5 <5 2 9 6/22/1999 738 -- -673 -1 75 - 3 9 9/13/1999 NP 912 -- -847 -1 74 <50 <0 5 <0 5 <0 5 <0 5 <5 3 3 12/15/1999 - 902 -- -837 0 10 - - 3 3 3/23/2000 P 4 33 368 4 69 <50 <0 5 <0 5 <0 5 <0 5 <2 5 35 6/21/2000 - 8 61 -7 96 -428 - 2 2 9/13/2000 NP 836 - -771 025 <50 <0 5 <0 5 <0 5 <0 5 <2 5 1 29 12115/2000 NP 786 — -720 051 - 1 43 BHD 1 8/26/1988 058 - -- - -- 6,050 220 2,000 1,000 11/28/1988 1,670 <100 480 100 2/27/1989 - -- - - 5/30/1989 -- - -- 2,900 120 870 780 8/22/1989 - - 1 450 300 890 1,170 12/4/1989 - -- 1400 170 1,600 2,800 1/4/1990 1570 -1512 - 2/1/1990 1542 - -1484 0 28 - 2/15/1990 1539 - -1481 0 03 2/22/1990 1622 -15 64 -0 83 - 3/8/1990 1517 - -1459 1 05 1 250 50 1 870 1 360 4/5/1990 1538 - 1480 -021 4/19/1990 1558 1500 -020 5/10/1990 1592 - -15 34 , -0 34 5/24/1990 1589 - -1531 003 - - 6/5/1990 -- -- -- - 6/18/1990 1637 - -1579 1180 40 2070 860