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• i • <br /> z <br /> TABLE 1 <br /> Groundwater Monitoring Data <br /> Former Beacon Station No 12419 <br /> 2350 Waterloo Road,Stockton,California <br /> I <br /> ethyl- Depth to TOC GW <br /> Well TPHg benzen toluene benzen xylenes MTBE D1PE ETBE TAME TBA methano ethanol EDC EDB GW Elevation Elevation <br /> Humber Date (uglL) (uglL) (ug1L) (ug1L) (ug1L) (ug1L) (ug/L) (ug1L) (ug1L) (ug/L) (ug/L) (ug1L) (uglL) (ug1L) (feet) (feet sea level)(feet sea level) Comments <br /> VW-2 03/26/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm nm dry <br /> screened 06/02199 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm slight odor 1 no sheen <br /> Interval 08/31/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry <br /> 15'-25' 12/09/99 ns AS ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry <br /> 02121100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry <br /> 05/18/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry <br /> 09126/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry <br /> 12/21100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry <br /> 03/27/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry <br /> A5-1 02/21100 80000 7600 16000 1600 9100 34 <2 0 <2 0 <2 0 <20 380 12000 180 250 4589 nm nm slight odor/no sheen <br /> screened 05/18/00 23000 2300 4800 480 2900 <10 00 <10 <10 <100 <1000 <100 na na 4109 nm no odor/no sheen <br /> interval 09/26/00 54000 2600 5300 590 3200 <5 0 na na na na na na na na 4913 nm slight odor!no sheen <br /> 84-69' 12/21/00 52000 5000 10000 1200 6000 <500 na na na na na na na na 4779 nm odorlrlo sheen <br /> 03/27/01 140000 16000 34000 3300 18000 <500 na na na na na na na na 4665 nm odor/no sheen <br /> AS-2 10/20/00 29000 140 1600 650 3100 <0 50 <0 50 <0 50 <0 50 <5 0 <50 610 1 1 6 3 41 52 2016 -2076 <br /> screened 12/21100 18000 120 1200 530 2800 <50 na na na na na na na na 4598 -2522 slight odor/no sheen <br /> Interval 03/27101 11000 91 820 230 1800 <20 na na na na na na na na 4651 -2575 slight odor 1 no sheen <br /> 12T 128' <br /> AS-3 10120100 <50 <0 50 <0 50 <0 5o <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 81000 <0 50 <0 50 4607 2060 -2547 <br /> screened 12/21/00 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4805 -2745 no odor I no sheen <br /> interval 03/27/01 <50 23 58 <0 50 <0 50 <5 0 na na na na na na na na 4682 -2622 no odor 1 no sheen <br /> 60-85' <br /> Notes TPHg=total petroleum hydrocarbons as gasoline TBA=tert-butanol GW=groundwater nm=not measured <br /> MTBE=methyl-tert-butyl ether EDC=ethylene dichlonde TOC=top of casing na=not analyzed <br /> DIPE=di sopropyl ether EDB=ethylene drbromide <=less than indicated reporting lima ns=not sampled <br /> ETBE=ethyl-tert-butyl ether pg/L= micrograms per liter=parts per billion(ppb) <br /> TAME=ten-amyl-methyl ether <br /> 419gmr00 xis Page 6 of 6 HORZON ENVIRONMENTAL',INC <br /> 141941 <br />