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Table 1. Summary of Groundwater Monitoring Data: Water Elevations and Analyses ARCO Facility 2133, Stockton, California Top-of-casing Depth-to- Product Water-level Change since Concentrations in t L Well number elevation, feet water, thickness, elevation, last measurement, Total and date above mean sea level ui feet in feet in feet(a) in feet Benzene Toluene Btli (benzene Xylenes I PI I-G M1 BE 6119190 1920 -- -1578 -073 135 166 20 ! I I 7112/90 1930 -15 88 -0 to -- 8116/90 1965 -- -1623 -035 -- -- _ -- --9/17/90 1994 -- -1652 -0299/19/90 1994 -1652 0 00 90 82 14 110 680 -_ 10/11/90 20 03 -- -1661 -009 12/6/90 1897 -- -1555 106 2112/91 1953 -- -16 It -056 120 13 21 300 1400 2125/91 1940 -- -1598 0 13 4123/91 1856 -15 14 084 22 <0 5 1 7 11 400 7/16/91 22 19 -1877 -363 420 35 40 360 4100 10/8191 2l 73 -- -18 31 046 410 19 62 380 5700 -_ 1122192 20 00 -- -16 58 1 73 220 64 <14 120 6200 -- 4122/92 1908 -- -1566 092 570 57 150 510 14000 " 7129192 20 64 -- -1722 -1 56 790 36 280 830 21000 _. 10/29/92 21 00 -1758 -036 390 <20 68 150 6600 -- 1/27/93 1768 -- -1426 3 32 830 180 390 950 51000 -- 4/29/93 1591 -- -1249 1 77 530 <100 156 730 28000 -- 815/93 17 53 -- -14 11 -162 540 <130 200 550 54000 11/10/93 17 56 -- -14 14 -003 290 120 95 280 30000 3121/94 1720 -- -13 78 036 220 16 39 170 4900 6127194 1704 -- -13 62 0 16 210 79 22 120 3400 -- 9/29/94 18 12 -- -1470 -l 08 180 13 24 65 2200 1218194 1773 -- -1431 039 150 79 25 28 1800 3/8195 15 25 -- -11 83 248 85 <17 35 32 8600 6/l/95 13 75 -- -1033 1 50 180 <17 50 71 8900 9/11/95 1596 -12 54 -221 38 <20 32 49 7500 -- 12/5/95 1634 -- -1292 -038 13 <8 6 5 1 100 -_ 3/18196 11 00 -- -758 5 34 24 <0 5 43 65 2000 6118196 1205 -- -863 -1 05 11 9 32 32 620 <5 9/25/96 1445 -- -11 03 -240 4 <0 5 1 5 33 400 <5 331MIA1111 1 51213311.116 XL%