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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) (ft,TOC) (ft) (ft,MSL) Change(ft) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (mg/L) E-10 12/15/00 P 825 -699 054 18,200 1,440 824 245 424 10,700 070 (cont) 3/2/01 P 619 sheen -493 206 6,830 1,770 <50 0 131 228 19,600 -- 5/10/01 P 662 -536 043 4,500 879 229 721 354 2,750 8/22101 P 905 779 243 8,800 810 250 360 1,500 13,000 -- 12J5101 P 848 - -722 057 11,000' 2,400 110 580 600 37,000 676 3/12102 P 647 - -521 201 <20,000 610 <200 <200 450 44,000 086 616102 P 7 35 -609 -088 8,400' 200 <50 <50 <50 14,000 022 9/24/02 P 910 -784 175 570" 58 <2 5 <2 5 <2 5 780 Oil 12/17/02 P 797 -- -671 1 13 12,000 620 68 160 <20 8,500 — E-11 8/26/88 342 -- -- - - -- 11/28/88 - -- 440 380 110 460 2127189 400 250 120 820 5/30/89 437 162 97 281 8/22189 - - - 160 36 38 220 - 12/4/89 -- -- 240 26 38 290 1/4/90 1839 -1497 -- - -- -- -- 211/90 -211/90 1819 -1477 020 - - - 2/15190 1816 -1474 003 - - -- 2122/90 1893 -1551 077 - -- - -- -- 3/8/90 17 91 -1449 102 801 31 3 756 242 4/5190 1817 -1475 026 -- -- -- - 4/19/90 1825 -1483 -008 - 5110/90 1855 -1513 030 -- - 5124/90 1850 -1508 005 6/5/90 1847 -1505 003 -- -- -- 6119/90 1920 1578 073 - 135 166 20 111 -- 7/12/90 1930 -1588 -010 - -- - -- 8/16/90 1965 -1623 -035 -- -- 9/17190 1994 -1652 029 -- -- -- -- -- 9/19/90 1994 -1652 000 680 90 82 14 110 10/11/90 2003 -1661 009 -- -- -- -- -- 12/6190 1897 - -1555 1 06 - - -- -- - 2112191 1953 -1611 -056 1,400 120 13 21 300 Projects/ARCO/2133/Reports/Tables/gwtables2133 As 20