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TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No.12474 3440 East Main Street,Stockton,California ethyl- �nr��Ass Depth to TOC GW Well TPHg benzene toluene benzene xyDIPE ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date a !L u /L u !L u !L Lug/L) a !L u !L u IL u 1L u 1L u IL u IL feet feet ms!) feet msl Comments VW-2 03103100 ns ns ns ns ns ns ns ns nm n06122!00 ns ns s ns ns nm nm nm dscreened ns ns ns ns ns ns ns ns ns ns ns ns nm ry interval 09128!00 ns ns ns ns ns ns ns ns ns ns nns ns ns nm nm dry 37-47' 12/22/00 ns ns ns ns ns ns ns ns ns ns ns ns ns AS nm nm dry 03!28!01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 06127!01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 09/06/01 ns n$ ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 12104/01 ns ns ns ns. ns ns ns ns ns ns ns ns ns nsnm nm dry ,. 03101102 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 05120102 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry nm dry VW03103100 ns screened 06122IOQ ns ns ns ns ns ns ns ns ns nm ns ns ns nm nm nm dry interval ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm 09/28100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 23-33' 12122!00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 03126/01 ns ns ns ns ns ns ns nsns ns ns ns ns ns nm nm dry 06127101 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 09106101 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 12104101 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 03101!02 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 05120!02 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry nm dry VW4 09!08198 86000 19000 6900 3100 20000 1.4 <0.50 <G,50 <0.50 <5-0 7470-<,5.0 na na F9.1G Screened 12!30!98 79000 290W 1600 3700 16000 <100 nm nm strong odorino sheen na na na na na na na na 57.28 Interval 03125!99 89000 14000 2700 3200 13000 <5.0 <5,0 <5.0 <5.0 <50 <500 <50 na. no 55.23 nm petrol.odorino sheen 50'•65' 06103199 39000 10000 1600 2900 11000 <0.50 <0.50 <0.50 <050 <5.0 <50 < nm no comment 08130!99 50()00 9200 1500 3500 12000 86 5.0 930 120 54-44 nm no comment 20 <20 <20 <200 <2000 e200 850 G4- 56.53 nm no comment 12110!99 64000 9300 2200 2800 9700 <20 <20 <20 <20 <200 <10000 <200 710 42 56.61 03103!00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm no comment 06122/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 09128/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 12!22100 55000 6400 1600 3200 5400 <200 no na na na na no no na 56.01 nm dry nm odor 1 no sheen 03128101 41000 5200 2000 2700 4600 <200 no na no no no no no na 55.00 nm odor lno sheen 06127!01 28000 5000 580 3000 1900 <20 <20 <20 <20 <200 <2000 <200 370 <20 56-42 09!06101 26000 2900 410 2800 840 <100 no no na no na na no no 58.45 nm odor!no sheen 12104101 22000 2000 550 2400 1200 <100 no no no no na na no no 59-10 nm odorino sheen 03/01/02 20000 1900 110 2500 1400 <100 no nano no na na no no 57-95 nm odorino sheen 05!20102 18000 1300 430 2000 1600 <10 <10 <10 <10 <100 < nm odorodorino sheen 1000 <10 130 <o 56.09 27.74 -30.3no odor!no sheen 08!30102 20000 1500 460 2300 1300 <100 no na na na na na na na 61.04 -33.30 odor/no sheen 12!06102 36000 3600 1000 3000 4300 <20 no no na no no no no no 61.44 -33.70 odor!no sheen 474gmr00.x1s Project No.1474.44 Page 7 of 8 HORIZON ENVIRONMENTAL INC.