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• • <br /> Table la <br /> Groundwater Momtoring Data <br /> Beacon Station No.419 <br /> Stockton,Callforaia <br /> Well Date MTBE DIPE ETBE TAME TBA Medmal Ethanol EDC EDB comments <br /> Nurnher ugtL UWL ug[L UgL u <br /> MW-9 12/30198 <25 0 na na na na na na na na W419 odor l iw sheen <br /> (scam d 03/26!99 <0 50 <0 50 <0 50 <0 50 11 <50 <50 na na no odor I no sheen <br /> utter ml. 06!01199 <0 50 <0 50 <0 50 <0 50 13 <50 <50 16 <0 50 no odor I no slum <br /> 41'-66) 08/31199 055 <0 50 <0 50 <0 50 93 <50 e5 0 42 <0 50 no comment <br /> 11109/99 079 <0 50 <0 50 <0 50 10 <50 <50 13 <0 50 no cornowd <br /> 07/21/00 055 <0 50 <0 50 <0 50 10 <50 88 95 <0 50 dight odor I no sheen <br /> MW-10 12130!98 <5 0 na na na na na na na na no odor 1 no green <br /> (9mvened 03/26+99 <0 50 <0 50 <0 50 <0 50 92 <50 <5 0 na na no odor I no sheen <br /> interval- 0640]199 <0 50 <0 50 <0 50 <0 50 12 <50 <50 94 <0 50 no odor I no down <br /> 41'.66) 08131/99 <0 50 <0 50 <0 50 <0 50 93 <50 <5 0 65 <0 50 no conmreat <br /> 12109/99 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 26 <0 50 no comment <br /> 02/21/00 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 33 <0 50 rw odor/u0 w uu <br /> VW-1 03/26199 4 <10 <10 <10 250 1,700 220,000 na na no odor/no sheen <br /> (@named MOM 55 <10 <10 <10 240 4,400 99,000 35 790 111*9 ododno sheen <br /> uacival. 08/31/99 ns ns m ns ns ns ns ns Well dry u 43 9 fear <br /> 34'-44) 12109/99 rn ns ns ns ns ns ns ns its Well Dry <br /> 02/21/00 m w w w m ns ns ns m nrn <br /> VW-2 03/26/99 m ns m ns ns in ns ns ns Well dry at 24 0 foot <br /> (Kremed 06/01199 m ns m m w ns ns m w slightodor 1w sheen <br /> Interval- 08131/99 ns its ns rn Its ns ns ns ns Well Dry <br /> IS'-25) 12/09/99 na ns nn m w w w ns ns Well Dry <br /> 07/21/00 N 1115 m m in m ns ns ns Well Dry <br /> AS-1 02/21/00 34 <2 0 <20 <20 <20 380 12,000 180 250 shghr ododno sheen <br /> (-remed <br /> VA2W- <br /> 64'-69) <br /> Notes <br /> MTBE=methyl terhaty bury]ether TBA=Teri Butanol ug/L=micrograms per Litre or parts par billion(ppb) <br /> DIPS-dr taoprMl On EDC=ethylene dichlonde na=not analyzed <br /> ETBE-etbyl tertiary butyl ether EDB=ethylene dibronude ns=not sampled <br /> TAME=tertiary amyl methyl ether <br /> ODQA ud*Q1 Page 3 of 3 HORIZON ENVIRONMENTAL INC <br />