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aJ I I� TABLE 1 ' GROUNDWATER MONITORING DATA Former Beacon Station No 12419 2350 Waterloo Road, Stockton, California J I ethyl- II II Depth to TOC GW WellTPH9 benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol OCA EDB GW Elevation Elevation Number Pate (uglL) u R) (uglL} (u !L) (uglL) (u IL) (.g Q (i 1L (u91L) (ug1L) (ug/L) u 1L) (ug1L ug/L) (feet) (feet sea level) (feet sea level) Comments MW-4 03/31/98 75 <0 50 <0 50 <0 50 <0 50 <50 na na na na na na na na 4792 2000 2792 screened 06110!98 58 <0 50 <0 50 <0 50 <0 50 <50 na nal na na na na na na 4221 2221 interval 09108/98 50 13 14 <0 50 24 <0$0 <0 50 <0 50 <0 50 <5 0 <50 <50 na na 46 64 2664 no odor I no sheen l48 -70 11112/98 as ns as ns as ns�' ns ns' as ns as ns ns as 2000 wellhead survey 12130198 68 14 087 <0 50 1 1 <5 0 na na na na na na na na 4500 2500 no odor I no sheen 01 74 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 1050 <50 <50 <20 na na 4075 2075 no odor I no sheen 06!02199 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 32 <0 50 4019 20 19 no odor I no sheen 08131199 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0$0 <50 <50 <5 0 43 <0 50 4509 2509 no comment 12!09199 <50 <0 50 <0 50 <0 50 '050 <0 50 <0 50 <0 50 1050 69 <50 <5 0 49 <0 50 46513 2056 02!21100 68 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 30 <0 50 4494 2494 no odor I no sheen 05118100 62 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 na na 3923 1923 no odor I no sheen ' 09126!00 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na nab na na na na na na 4855 2855 no odor I no sheen a 12120100 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4698 2698 no odor!no sheen 03/27101 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na� na na na na na na 4571 1 -2571 no odor-/no sheen 06!26101 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <050 <050 <050 <5 0 <50 <5 0 <0 50 <0 50 4840 2840 no odor 1 no sheen 09/05101 c50 <0 50 <0 50 <0 50 <0 50 <5 0 na nal na na na na na na 5355 3355 no odor I no sheen 11/30101 <50 <0 50 <0 50 <0 50 <0 50 <50 na nal na na na na na na 5339 -3339 no odor!no sheen I 02127102 <50 <0 50 <0 50 <0 50 <0 50 <5 0 ns i na na na na na na na 5009 -3009 no odor I no sheen 05116102 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 43 <0 50 5027 2156 2871 no odor!no sheen 09!72102 <50 <0 50 <9 50 <0 50 <0 50 <56 na nal na na na na ria na 5846 3690 no odor 1 no sheen 12104102 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na nal na na na na na na 5660 3504 no odor Ino sheen 1 02/17103 110 <0 50 <0 50 <0 50 <0 50 <0 50 na nal na na na na na na 5344 3188 no odor I no sheen 0611 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 74 <0 50 5294 31 28 no odor!no sheen 09118103 ns ns ns as ns as I� ns ns l ns ns ns ns ns ns nm nm not sampled 11124103 <50 <0 50 <0 50 <0 50 <0 50 <0 50 na na na na na na na no 5791 3635 no odor I no sheen I 02123104 60 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 59 <0 50 5436 3280 no odor I no sheen ' 06!07104 ns as as as as ns, asf nsl ns ns ns ns ns ns 5463 3307 not sampled 09107104 as ns as ns ns ns" as nsl ns ns ns ns ns ns 61 39 -3983 not sampled 12/10/04 ns ns ns ns as ns nsl nsl as ns ns ns ns ns 5884 -3728 not sampled 03/08105 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 5�0 <0 I50 <0 50 <50 <50 <50 37 <0 50 5525 3369 no odor I no sheen i I a I � I r , I I 4199-05 al Pnecl rlo t Pa3 1101MON BNVIROIL INC I