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r TABLE GROUNDWATER MONITORING DATA Beacon Station No 3641 1210 E Hammer Lane,Stockton,California Depth to TOC GW Well TPHg be 101uerte elhylbenzene xylenes MTBE RIPE ETBE TAME TBA methanol ethanol EDC EDS GW Elevation Elevation Number Date u p u eA (U94, u A u A u A u 11 u A u A u it u ✓I u A (u94) u 8 feet feet msl feet msQ Comments VW 7 03125!99 25000 5700 3300 1500 1700 2000 <5 0 <5 0 <5 0 200 <50 <5 0 no na 41 67 nm nm slight odor 1 no sheen screened 06!02199 11000 3300 320 1100 230 1700 <5 0 <5 0 <50 92 <100 <5 0 <5 0 <50 41 94 nm slight odor 1 no sheen Interval 06!31199 ns as as as ns ns ns ns as ns as ns as ns 4735 nm 0 21 It FPlsheen 411-55 12!09199 87000 2300 1010 1500 5400 6400 <50 <50 <50 <500 <5000 <500 <50 <50 4526 nm no comment 03/01100 11000 2200 160 640 640 4300 <50 <50 <50 <500 <5000 <500 no no 4247 nm no comment 06/06/00 15000 2400 440 620 1100 3000 <50 <50 <5 0 280 <2000 <50 <5 0 <5 0 4150 nm dear 09/14/00 46000 440 560 1600 3000 1000 <5 0 <5 0 <5 0 76 <600 <50 <50 <5 0 4781 nm dear/sheen 12112/00 17000 940 420 450 1600 5200 no no no no na no no no 4416 nm dear 03/19101 4100 650 16 180 94 2900 no na no no no no no no 41 38 nm clear 06119101 24000 2800 870 770 1800 7300 no na na na no no no no 4386 nm clear 09127101 51000 1400 3900 1800 6800 1400 no no no no no na no no 5001 nm dear 12/13/01 4400 270 70 140 240 2000 na na no no no no no no 4657 nm dear 03/28/02 24000 1100 760 850 2100 2500 na no na no no no no no 4314 1929 -2385 dear 06/19/02 36000 2600 2000 1200 4600 5100 no na na na na na na no 4489 2560 dear VW-0 03125/99 ns ns ns ns ns as as ns ns ns as ns as ns dry nm nm dry screened 06/02/99 ns ns ns ns ns ns ns as ns as ns ns as ns dry nm dry Interval 08/31/99 ns ns ns as ns ns ns as ns ns ns ns as ns dry nm dry 22-32 12/09/99 ns ns ns ns ns as ns as ns ns ns ns as ns dry nm dry 03/01/00 ns ns as as ns ns ns as ns ns as ns as ns dry nm dry 06106!00 ns ns as ns ns ns ns as as ns ns ns as ns dry nm dry 09114100 ns ns ns ns ns ns ns as ns ns ns ns as ns dry nm dry 12112/00 as as ns as as ns ns as ns ns as ns as ns dry nm dry 03!19/01 ns as as as as ns ns as as ns ns ns as ns dry nm dry 06119/01ns ns ns as as ns ns as as ns ns as ns ns dry nm dry 09127101 ns as ns as as ns ns ns Its ns as as ns ns dry nm dry 12113101 as ns as ns ns as ns ns ns ns as ns ns ns dry nm dry 03/28102 ns as ns ns ns as ns ns as ns ns ns ns as dry nm dry 06119102 ns as as ns ns as as ns ns as ns as ns as dry nm dry Notes TPHg=total petroleum hydrocarbons as gasoline µg11=micrograms per hler(pans per billion or pph) MTBE=methyl ten-butyl ether GW=gmundwater DIPE-dusapropyl ether TOC=lop ofc mg E ME=ethyl ten butyl ether na=not analyzed TAME=ten amyl methyl ether FP=free product TBA-ten butyl alcohol 641gmr9i As 164122 Page 7 of 7 HORIZON BNVIRONM$ITAL INC