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TABLE l Groundwater Monitoring Data Beacon Station No 641 1210 E Hammer Lane,Stockton,California Depth to TOC GW Well TPHg benzene toluene ethylbenzene xylenes MTBE DIPE ETSE TAME TSA methanol ethanol EDC EDS GW Elevation Elevation Number Date u 11 (ug/1) u t1 u u !l (u9A) (ug/1) (ug/1) (ug/1) (ug/1) (U0111 u H (ugh)( (ug/1) feet feet msl feet msl Comments VW 5 03125/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm nm screened 06!02!99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm interval 08131/99 ns ns ns AS ns ns ns ns ns ns ns ns ns ns 4773 nm 0 05 ft FP/sheen CY 50' 12109M 100000 13000 10000 570 16000 31000 <20 <20 <20 <200 <2000 <200 <20 <20 4570 nm no comment 03101/00 27000 5100 520 1500 770 14000 <50 <50 <50 <500 <5000 <500 na na 4247 nm no comment 06!06100 43000 7700 4600 1300 3700 16000 <10 <10 <10 750 <2500 <100 <10 <10 41 84 nm clear 09/14/00 ns ns its ns ns ns ns ns ns ns ns ns ns ns 4803 nm considered dry VW-6 03125/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm nm screened 06102!99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm Interval 08131/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 4773 nm sheen 22-32 12109!99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 03101100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 06!06100 ns ns ns ns ns ns ns ns ns ns its its ns ns nm nm dry 09114100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry VW 7 03125/99 25000 5700 3300 1500 1700 2000 <5 0 <5 0 <5 0 200 <50 <50 na na 4167 nm nm slight odor 1 no sheen sueened 06102!99 11000 3300 320 1100 230 1700 <5 0 <5 0 <5 0 92 <100 <50 <50 <50 4194 nm slight odor 1 no sheen Interval 08/31/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 4735 nm 0 21 ft FPlshaen 40-55` 12!MM 87000 2300 1000 1500 5400 6400 <50 <50 <50 <500 <5000 <500 <50 <50 4526 nm no comment 03/01/00 11000 2200 160 640 640 4300 <50 <50 <50 <500 <5000 <500 na na 4247 nm no comment 06/06/00 15000 2400 440 620 1100 3000 <5 0 <50 <5 0 280 <2000 <50 <5 0 <50 4150 nm clear 09/14/00 46000 440 560 1600 3000 1000 <5 0 <50 <50 76 <600 <50 <5 0 <5 0 4781 nm clear/sheen VW-8 OMS199 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm nm dry screened 06/02/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry interval 08!31199 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 27 32 12109199 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 03/01100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 06/06/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 09114/00 dry nm dry Notes TPHg=total petroleum hydrocarbons as gasoline 110=micr06rams per bler(pans per billion or ppb) MTBE=methyl ten butyl ether GW=groundwater DIPE=dusopropyt ether TOC=top ofcasm6 ETBE=ethyl ten butyl ether na-not analyzed TAME=ten Amyl methyl ether FP=free product TBA=ten butyl alcohol 641gmr00 As 164143 Page 4 of 4 HORIZON 0MRONMENTAI.INC