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Table 1 Page 10 of 30 Groundwater Elevation and Analytical Data ARCO Service Station#2133 2908 Benjamin Halt Dr,Stockton,California Well Depth Product Groundwater Groundwater Total Date Elevation to Water thickness, Elevation Elevation change TPN G Benzene Toluene Ethylbenzene Xylenes MTBE DO Sampled (feet,MSL) (feet,TOC) in feet (feet,MSL) (feet) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) mg/I 5/10/1990 1630 -- -1514 030 E 7 5/24/1990 1628 - 1512 0 02 (cont} 6/5/1990 -- - -- -- 6/18/1990 Dry - -- 7/12/1990 1703 -1587 -- 8/16/1990 1712 -1596 -009 9/17/1990 1772 -- -1656 -060 - - 9/18/1990 1772 -- -1656 000 1,100 100 12 45 28 10/11/1990 1776 1660 -004 - - - 12/6/1990 - -- -- - - 2/12/1991 1728 1612 - 840 33 8 72 21 2/25/1991 1722 -1606 006 - - 4/23/1991 16 33 -1517 089 7116/91 1865 1749 2 32 - - - - 10/8/1991 1900 1784 0 35 1/22/1992 1775 -1659 125 860 28 1 2 21 23 4/22/1992 1681 - -1565 094 500 <2 1 <3 2 <1 9 <1 9 7/29/1992 1827 -1711 146 - - - - - 10/29/92 .. -. - - - - 1/27/1993 1548 -1432 -- 660 <5 27 1 6 2 9 4/29/1993 1373 - -1257 1 75 450 <3 4 <3 1 <20 <0 9 8/5/1993 15 43 -- -1427 -1 70 360 <5 <3 2 9 0 9 11/10/1993 1567 1451 -024 150 1 6 06 1 4 0 6 3/21/1994 1509 -1393 0 58 68 2 9 1 4 0 8 3 4 6/27/1994 1486 -1370 0 23 180 <0 3 <0 3 3 9 0 8 9/29/1994 16 05 -1489 1 19 <50 <0 5 <0 5 <0 5 <0 5 12/8/1994 1565 -1449 0 40 <50 <0 5 <0 5 <0 5 <0 5 3/8/1995 1301 - 11 85 2 64 <50 <0 5 <0 5 <0 5 <0 5 6/1/1995 11 69 -- 1053 1 32 67 <0 5 <0 5 3 5 12 9/11/1995 1385 - -1269 -216 75 <0 5 <0 5 0 5 <0 5 12/5/1995 1420 -1304 -035 - - - 3/18/1996 918 -802 502 <50 <0 5 <0 5 <0 5 <0 5 6/18/1996 1000 884 -082 - - - 9/25/1996 1247 - -1131 -247 56 <0 5 <0 5 <0 5 <0 5 <5 12/4/1996 11 88 -1072 069 - - 3/19/1997 NP 734 -- 618 454 <50 <0 5 <0 5 <0 5 <0 5 0 2 6/5/1997 P 887 -- -771 153 - - - 0 3 8/19/1997 NP 1042 -926 155 54 <0 5 <0 5 <0 5 <0 5 <5 0 2