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• i • Table 1 Groundwater Elevation and Analytical Data ARCO Service Station #233 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) (mglL) BHD-1 8/22189 - 1,450 300 890 1,170 (cont) 1214/89 -- -- 1,400 170 1,600 2,800 1/4190 1570 -1512 -- -- -- -- -- 2/1/90 1542 1484 028 2115/90 1539 -1481 003 - -- -- -- 2122190 1622 - -1564 083 -- -- -- -- 318/90 1517 -1459 105 1,250 50 1,870 1,360 4/5/90 1538 -1480 021 -- -- - -- 4/19/90 1558 -1500 020 - - 5/10/90 1592 -1534 034 -- 5/24/90 1589 -1531 003 6/5/90 - -- - 6/18/90 1637 -1579 -- 1180 40 2070 860 7/12/90 1660 -1602 023 -- -- -- 8/16/90 1789 -1731 1 29 9/17/90 1724 -1666 065 - -- - -- -- 9118/90 1724 -1666 000 2,000 110 9 30 650 10/11/90 1731 -1673 007 -- -- - -- - -- 1216190 1724 -1666 007 - -- -- - -- -- -- 2/11/91 1692 -- -1634 032 6,000 890 60 1,000 360 2/25/91 1686 -1628 0 06 - -- - -- -- -- 4123191 1599 - -1541 0 87 3,300 240 48 440 130 7/16/91 1800 -1742 -201 7,000 420 420 400 830 10/8/91 1850 -1792 050 3,000 220 <40 210 15 - 1/22/92 1712 -1654 138 4,600 200 240 <10 260 4/22192 1639 - -1581 073 3,000 130 67 200 120 7/29/92 1793 -1735 154 8,100 260 21 600 510 10/29/92 1835 -1777 -042 1,800 80 <25 110 17 1127/93 1527 -1469 308 6,700 270 19 790 300 4129/93 1336 -1278 191 7,000 340 <20 610 460 8/5/93 1485 -1427 -149 10,000 280 31 930 950 11/10/93 1523 -1466 038 10,000 220 11 570 420 3/21/94 1436 -1378 0 87 8,600 83 14 480 360 6/27/94 1430 -1372 006 9,600 110 32 490 420 Prolects/ARGO/2133/Reports/Tables/gwtables2133 As 29