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TABLE 1 Groundwater Monitoring Data Former Beacon Station No 12419 2350 Waterloo Road,Stockton,California ethyl Depth to TOC GW Well TPHg benzen toluene benzen xylenes MTBE DIPE ETBE TAME TBA methano ethanol EDC EDB GW Elevabon Elevabon Number Date (ug/L) (ug/L) (ug/L) (ugA-) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (feet) (feet sea level) (feet sea level) Comments VW 2 0326199 ns as ns as ns as ns ns ns ns as ns ns as dry am am dry screened 06102199 ns as ns as ns as ns ns as ns ns as as ns dry rail slighlodor/no sheen interval 06/31199 ns as ns as ns as ns ns as ns as ns as ns dry rim dry 15 25 12/09199 ns ns ns as ns as ns ns ns ns as ns as ns dry am dry 02211W ns as ns as ns as ns as ns ns ns ns ns ns dry runt dry 05/18/00 ns as ns as ns as ns ns as as as as ns as dry nm dry 09126w ns ns ns ns ns as ns as ns ns as ns ns ns dry nm dry 1221100 ns as ns as ns as ns as ns ns as ns ns ns dry am dry 03/27/01 ns as ns as ns as ns ns ns ns as as ns ns dry nm dry 062Gl01 ns as ns ns ns ns ns ns as ns ns ns as as dry nm dry AS 1 0221/00 00000 7600 16000 1600 9100 34 <20 <2 0 <2 0 <20 380 12000 180 250 4589 nm nm slight odorhw sheen screened 05/1aW 23000 2300 48W 480 29W <10 410 <10 00 <100 0ow <100 na na 4109 am noododnosheen interval 0926100 54000 2600 5300 590 3200 -50 na na na na na na na na 4913 nm slight odor no sheen 64 69 1221A0 52000 5000 10000 1200 6000 <5W na na na na na na na na 4779 am odorhw sheen 03/27!01 140000 16000 34000 3300 IN= <5W na na na na na na na na 4665 nm odorinosheen 0626101 140000 14000 34000 3700 18000 410 <1 0 <1 0 <10 <10 <100 <100 83 140 4979 nm odor/no sheen AS-2 1020/00 29000 140 1600 650 3100 -050 <0 5D <0 50 <D 50 <5 0 <50 610 1 1 63 4152 2076 2076 screened 1281100 18000 120 1200 530 2800 <50 na na ns na na na na na 4598 2522 slight odor Ino sheen interval 0387101 11000 91 820 230 1800 <20 na na na na na na na na 4651 2575 slight odor I no sheen 123 128' 0686101 12000 60 68 220 2000 <2 5 <2 5 <2 5 <25 <25 <250 <50 <2 5 50 4925 2849 slight odor I no sheen AS-3 1020100 <50 <0 50 <0 50 -050 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 81000 <0 50 <0 50 4607 20 60 2547 screened 122190 <50 <0 50 <0 50 <0 50 <0 50 <50 na na na na na na na na 4805 2745 no odor I no sheen interval 03/27101 <50 23 58 <0 50 <0 50 <60 na na na na na na na na 46 82 2622 no odor/no sheen W45 06QWI <50 <0 50 062 <0 50 <0 50 <D 50 <0 50 <0 50 <0 50 12 <50 690 89 <0 50 4696 2836 no odor I no sheen Notes TPHg-total petroleum hydrocarbons as gasoline TBA-ten butanol GW=groundwater nm-not measured MTBE-methyl tcrt butyl ether EDC-ethylene dichloride TOC=top of casing na=not analyzed DIPE dusopropyl ether EDB=ethylene dibromrdc <=less than indicated reporting lima ns-not sampled ETBE=ethyl tent butyl ether pg/L- micrograms M liter-parts per billion(ppb) TAME=ten amyl methyl ether 41 OgW01 As 141944 Page 6 of 6 HORM.ON 6AVIIWNMENTAL INC