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. 0 • Table 1. Summary of Groundwater Monitoring Data: Water Elevations and Analyses ARCO Faculty 2133, Stockton, California Top-of-casing Depth-to- Product Water-level Change since Concentrations in L Well number elevation, feet water, thickness, elevation, last measurement, Total and date above mean sea level in feet in feet in feet(a) in feet Benzene Toluene Eth (benzene Xylenes. TPH-G MTBE 6/18/90 1747 -- -1591 -077 -- -- -- -- -- 7/12/90 1753 -- -1597 -006 8116190 17 82 -1626 -029 9/17/90 18 15 -- -1659 -033 9/19/90 18 15 -- -1659 000 130 140 80 6000 24000 -- 10/1 1/90 1824 -1668 -009 12/6/90 18 11 -- -1655 0 13 2/12/91 1780 -- -1624 0 3 l 2600 130 610 4700 18000 -- 2/25/91 1876 -1720 -096 -- -- -- -- __ 4/23191 1689 -- -15 33 1 87 7115/91 Dry -- -- -- -- -- -- -- -- 10/8/91 Dry 1/22/92 1824 -- -1668 -1 35 -- -- -- __ 4122/92 1745 -- -1589 079 170 98 50 120 3600 -- 7/29/92 Dry 10/29/92 17 19 -1563 026 480 32 440 1100 8900 -- 1/27/93 16 10 -- -1454 109 390 25 310 730 12000 -- 4/29/93 14 19 -1263 191 270 <98 150 380 12000 -- 8/5193 15 83 -- -1427 -164 370 22 220 460 16000 -- 1 1/10193 16 18 -- -1462 -035 210 21 200 390 12000 -- 3/21/94 1551 -- -1395 067 170 24 200 320 6300 -- 6/27/94 1534 -- -1378 0 17 780 18 660 980 10000 -- 9129/94 1636 -14 80 -1 02 430 14 470 630 8800 -- 1218/94 1597 -- -1441 039 450 20 610 810 7800 -- 3/8/95 13 54 -- -1 1 98 243 100 <20 230 260 8600 -- 6/1/95 1202 -- -1046 1 52 550 38 870 2000 24000 -- 9/1 1195 1422 -- -1266 -220 1700 7600 3000 14000 150000 -- 12/5/95 1458 -- -13 02 -036 960 1500 1000 3200 45000 -- 3/18/96 962 -- -806 496 290 130 240 490 8800 -- 6/18/96 1035 -- -879 -073 110 32 69 91 1600 110 9/25/96 1282 -- -11 26 -247 130 <5 180 46 2800 83 12/4/96 1220 -1064 062 290 32 250 80 2800 560 3316\1 ABLESU 133DEC6 XLS