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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 Elevatlon to Water Thickness Elevation Elevation TPHg Benzene Toluene benzene (total) fultBE DO Number Sampled (ft,MSL) ft,TOC) (ft) ft,MSL Change(ft) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (mg/L) 1/22/1991 dry -- - E 3 4/22/1992 dry (cont) 7/29/1992 dry 10/29/1992 dry __ .. - -- - -- 1/27/1993 1669 -- -1440 57,000 2,700 180 660 1 900 4/29/1993 1493 -1264 176 32,000 3,400 140 930 2,500 8/5/1993 1670 -- -1441 -177 27,000 1,800 69 670 1,400 11/10/1993 1714 - -1485 044 47,000 1,700 <50 740 2,000 3/21/1994 1660 -- -1431 054 24,000 1,500 86 620 1,500 6/27/1994 1625 -- -1396 035 19,000 1,500 36 670 1,400 9/28/1994 1704 -1476 -079 24,000 1,600 77 630 1,300 12/8/1994 1668 -- -1439 036 21,000 2,700 58 890 1,900 3/8/1995 1420 - -1191 248 94,000 1,600 130 640 2,600 6/1/1995 1268 -1039 152 58,000 1,900 24 590 2,500 9/11/1995 1501 -1272 -233 29,000 1,900 <50 640 1900 12/5/1995 1522 -- -1293 -021 - _- _ 3/18/1996 1040 -811 482 15,000 480 12 390 660 6/18/1996 1105 - -876 -065 - -- 9125/1996 1352 -1123 -247 7,600 160 <5 160 300 <50 12/4/1996 1293 -1064 059 -- - -- 3119/1997 P 837 -- -608 456 4 400 46 6 46 99 0 2 6/5/1997 P 1006 .777 -169 -- -- 0 2 8/19/1997 P 1153 - -924 -147 3,900 50 10 41 28 <50 01 11/25/1997 P 11 70 -941 -017 -- - - 3/20/1998 P 540 -311 630 <50 <0 50 <0 50 <0 50 <0 50 <5 0 2 0 6/24/1998 742 -513 -202 -- - 9/10/1998 P 919 -690 -177 1 440 146 3 91 127 5 31 651 12/17/1998 928 -- -699 -009 - - _ 3/10/1999 P 701 -- -472 227 900 454 1 68 763 245 <50 33 6/22/1999 877 -- -648 -176 - -- -- - 3 6 9/13/1999 P 1078 - -849 -201 481 1 85 <0 50 244 0 635 <5 0 1 8 12/15/1999 10 64 - -835 014 -- - - - - 84 3/23/2000 P 595 -- -366 469 889 609 0 987 5 36 305 <2 50 1 5 6/21/2000 820 -- -591 -225 -- - 03 Prolects/ARCO/2133/Reports/Tables/gwtables2133 As 4