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0 01 <br /> TABLE l <br /> Groundwater Monitoring Data <br /> Beacon Station No 3641 <br /> 1210 E Hammer Lane,Stockton,California <br /> Depth to TOC GW <br /> Well TPHg benzene toluene ethylbenzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation <br /> Number pate u It u A u u /I u !I u 11 u n u 1k u A u u !i (ug/1) (ug/1) u A feet feel msl feet msl Comments <br /> VW 5 03125199 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm nm <br /> screened 06/02/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm <br /> interval 08!31!99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 4773 nm 005 ft FP/sheen <br /> 40'50' 12/09199 100000 13000 10000 570 16000 31000 <20 <20 <20 <200 <2000 <200 <20 <20 4570 nm no comment <br /> 03!01100 27OW 5100 520 1500 770 14000 <50 <50 <50 <500 <5000 <500 na na 4247 nm no comment <br /> 06106!00 43OW 7700 4600 1300 3700 16000 <10 <10 <10 750 <2500 <100 <10 <10 4184 nm dear <br /> 09!14100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 4803 nm considered dry <br /> 12!12100 16000 1000 1100 480 1800 24000 na na na na na na na na 44 01 nm dear <br /> VW-6 03125199 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm nm <br /> screened 06!02199 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm <br /> interval 06/31199 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 4773 nm sheen <br /> 22-32 12109199 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry <br /> 03/01/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry <br /> 06106100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry <br /> 09114100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry <br /> 12/12/00 ns ns ns ns ns ns ns ns ns ns ns ns AS AS dry nm dry <br /> VW-7 03125199 25000 5700 3300 1500 1700 2000 -50 <50 <50 200 <50 <5 0 na na 41 67 nm nm slight odor!no sheen <br /> screened 06/02199 11000 3300 320 1100 230 1700 <5 0 <5 0 <5 0 92 <100 <5 0 <5 0 <5 0 41 94 nm slight odor!no sheen <br /> Interval 08/31/99 ns ns ns ns ns ns ns ns ns ns ns ns AS ns 4735 nm 0 21 it FP/sheen <br /> 40'55 12/09/99 87000 2300 1000 1500 5400 6400 <50 <50 <50 <500 <5000 <500 <50 <50 4526 nm no comment <br /> 03/01/00 11000 2200 160 640 640 4300 <50 <50 <50 <500 <5000 <500 na na 4247 nm no comment <br /> 06/06100 15000 2400 449 620 1100 3000 <5 0 <50 <50 260 <2000 <50 <50 <5 0 41 50 nm clear <br /> 09/14/00 46000 440 560 1600 3000 1000 <5 0 <5 0 <50 76 <600 <50 <50 <5 0 4701 nm clearisheen <br /> 12112100 17000 940 420 450 1600 5200 na na na na na na na na 4416 nm clear <br /> VW-8 03/25199 ns ns ns ns ns ns ns ns ns ns ns AS 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 dry <br /> Interval 08/31199 ns ns ns ns AS ns ns ns ns ns ns ns its ns dry nm dry <br /> 22'-32' 12109199 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry <br /> 03101!00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry <br /> 06!06!00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry <br /> 09!14!00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry <br /> 12112!00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry <br /> Notes TPHg=total petroleum hydrocarbons as gasoline µy71=micrograms per liter(pans per billion or pph) <br /> MTBE=methyl tert butyl ether GW=groundwater <br /> DIPE=dosopropyl ether TOC=top of casmg <br /> ETRE=ethyl tart butyl ether na=not analyzed <br /> TAME=len amyl methyl ether FP=free product <br /> TBA=tat butyl alcohol <br /> I <br /> 641gmrOOxis <br /> 164143 Page 4 of 4 HORIZON ENVIRONMENTAL INC <br />