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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 It,MSL Change(ft) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (mglL) E-4 12/6/1990 1882 -- -1649 016 - -- - (cont) 2/12/1991 1848 -1615 034 3,200 750 9 73 270 2/25/1991 1843 -- -1610 005 - -- - 4/23/1991 1762 - -1529 081 -- - 7/16/91 2030 -- -1797 -268 10/8/1991 2090 - -1857 -060 - - 1/22/1992 1901 - -1668 189 8,500 1,100 140 10 220 4/22/1992 1805 -- -1572 096 6,300 730 12 110 200 7/29/1992 1963 -- -1730 158 7,700 1,000 14 130 310 10/29/1992 1999 -- -1766 -036 5,600 1,300 16 130 180 1/27/1993 1672 -1439 327 10,000 470 26 130 270 4/29/1993 1494 -- -1261 178 14,000 1,300 22 280 520 8/5/1993 1663 -- -1430 -169 9,400 900 <20 160 240 11/10/1993 1692 -- -1459 -029 4,400 290 <20 67 130 3/21/1994 1639 -1406 053 5,400 340 24 110 220 6/27/1994 1614 -- -1381 025 7,800 790 11 170 470 9/29/1994 1706 - -1473 -092 1,600 130 <0 5 33 41 12/8/1994 1665 - -1432 041 5,200 940 88 170 380 3/8/1995 1419 -- 11 86 246 7,900 490 56 130 190 6/1/1995 1274 -1041 145 15 000 1,000 10 360 380 9/11/1995 1496 -- -1263 -222 10,000 1,000 <10 350 320 12/5/1995 1523 -- -1290 -027 - - - 3/18/1996 1010 -- -777 513 4,700 530 35 250 350 6/18/1996 1103 - -870 -093 -- - -- 9/25/1996 1347 -- -11 14 -244 7,600 890 <10 380 190 <5 12/4/1996 1294 -- -1061 053 - -- - 3/19/1997 NP 743 -510 551 1,600 120 84 38 <5 02 6/5/1997 1008 - -775 -265 -- - -- - - - 0 1 8/19/1997 NP 11 57 - -924 -149 1,800 83 78 63 76 110 01 11/25/1997 P 1127 -- -894 030 -- -- - 3/19/1998 NP 547 -- -314 580 110 36 <0 50 <0 50 <050 14 36 6/24/1998 753 -- -520 206 - . -- -- 9/10/1998 NP 920 -- -687 -167 972 335 <0 50 <0 50 <0 50 815 12/1711998 929 -- -696 -009 - -- Projects/ARCO/2133/Reports/Tables/gwtables2133 xis 6