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• • 0 <br /> Table 1. Summary of Groundwater Monitoring Data: Water Elevations and Analyses <br /> ARCO Facility 2133, Stockton, California <br /> Top-of-casing Depth-to- Product Water-level Change since Concentrations in pg/L mg/L <br /> Well number elevation, feet water, thickness, elevation, last measurement, Total <br /> and date above mean sea level in feet in feet in feet(a) in feet Benzene Toluene Ethylbenzene Xylenes TPH-G MTBE DO <br /> 6119190 1920 -- -1578 -073 135 166 20 -- <br /> 7112/90 1930 -- -1588 -0 10 <br /> 8/16190 1965 -1623 -035 <br /> 9/17/90 1994 -- -1652 -029 <br /> 9/19/90 1994 -- -1652 000 90 82 14 110 680 -- - <br /> - <br /> IO/l 1190 2003 -1661 -009 -- -- -- -- -- __ __ <br /> 12/6/90 1897 -- -1555 106 <br /> 2/12/91 1953 -- -16 11 -056 120 13 21 300 1400 -- -- <br /> 2125/91 1940 -- -1598 013 <br /> 4123/91 1856 -- -15 14 084 22 <0 5 1 7 11 400 -- -- <br /> 7/16/91 22 19 -- -18 77 -3 63 420 35 40 360 4100 -- -- <br /> 10/8/91 2173 -- -18 31 046 410 19 62 380 5700 -- <br /> 1/22/92 2000 -1658 1 73 220 64 <14 120 6200 -- -- <br /> 4/22/92 1908 -- -1566 092 570 57 150 510 14000 -- -- <br /> 7/29192 2064 -- -1722 -156 790 36 280 830 21000 -- <br /> 10/29/92 2100 -- -1758 -036 390 <20 68 150 6600 -- -- <br /> 1/27/93 1768 -- -1426 3 32 830 180 390 950 51000 -- -- <br /> 4/29/93 15 91 -- -1249 1 77 530 <100 156 730 28000 -- -- <br /> 8/5/93 17 53 -- -14 11 -162 540 <130 200 550 54000 -- -- <br /> 11/10/93 1756 -- -1414 -003 290 120 95 280 30000 -- -- <br /> 3121/94 1720 -- -1378 036 220 16 39 170 4900 -- -- <br /> 6/27/94 1704 -- -1362 0 16 210 79 22 120 3400 -- -- <br /> 9/29/94 18 12 -- -1470 -108 180 13 24 65 2200 -- -- <br /> 12/8/94 1773 -1431 039 150 79 25 28 1800 -- -- <br /> 3/8/95 1525 -- -1183 248 85 <17 35 32 8600 -- -- <br /> 6/1/95 13 75 -- -10 33 150 180 <17 50 71 8900 -- -- <br /> 9/11/95 1596 -1254 -221 38 <20 32 49 7500 -- -- <br /> 12/5/95 1634 -- -1292 -038 13 <8 6 5 1100 -- -- <br /> 3/18/96 1100 -- -758 5 34 24 <0 5 43 65 2000 -- -- <br /> 6/18/96 1205 -- -863 -105 11 9 32 32 620 <5 -- <br /> 9/25/96 1445 -- -11 03 -240 4 <0 5 1 5 3 3 400 <5 -- <br /> 12/4/96 1393 -- -1051 052 35 <0 5 14 2 280 <5 -- <br /> 3/19/97 950 -- -608 443 <0 5 <0 5 <0 5 <0 5 <50 -- 105 <br /> I <br /> 47571TABLES12133MAR7 Xl 5 <br />