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TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No.12474 3440 East Main Street,Stockton,California I� ethyl- total Depth to TOC GW Well TPHg benzene toluene benzene xylenes MTBE DIPS ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date u IL u !L u IL u IL u IL u IL u 1L u !L u IL u IL u IL u IL u IL u IL feet feet MSI feet msl Comments VW-2 03!03100 ns as as as as as ns as ns ns nm as as as nm screened 06122100 as as ns as ns as as nsns as as ns ns ns nm am nm dry Interval 09!26100 as as ns as as as as as as as as as as as am am dry 37-47' 12!22100 ns as as ns as as as as as as as as as as am am dry 03!28101 as as as as as as as ns as as as as as as am am dry 06!27101 as as as as as as as ns as as ns as as as nm nm dry 09106!01 as ns as as as as as as as as as as as as am nm dry 12104!01 as ns ns as as as as as nsns as as ns ns nm am dry 03701!02 as ns as as as ns ns ns as as as as as as am nm dry 05120102 as as as as as as as as ns ns as as as as nm am dry 03107103 as as as as as ns ns as as as as as as ns nm am dry 06103!03 as as as as as as as as as as as as as as nm am dry am dry VW-3 03103!00 ns as as ns ns as as as as ns nm as asns nm screened 06!22100 as as as as as ns ns ns as as as as as as nm am am dry interval 09128100 as as as as as as as as as as as as ns as nm am dry 23-33' 12/22100 ns as as as as as as as ns ns as as as as am am dry 03128!01 as as as as as as as as as as as as ns as am nm dry 06127101 as as as as ns as as as as as as as as as am nm dry 09!06!01 as as ns ns ns as as as as as ns as as as nm am dry 12104101 as as as as as AS as as as ns as as as as nm am dry 03/01102 ns ns as as ns as ns as as as as as as as am nm dry nm d 05!20102 as as as as as as as as ns as as as ns as nm ry 03107!03 as as as as as as as as as as as as as as nm am dry 06103103 as as as as as as ns ns as as as as as as am nm dry nm dry VW4 09108!98 86000 19000 6900 3100 20000 1.4 <0.50 <0.50 <0.50 <5.0 74.6--<5 0 na na 59.10 screened 12/30/98 79000 29000 1600 3700 16000 <100 na na na na na na na na 57.28 am nm strong odor/no sheen Interval 03/25/99 89000 14000 2700 3200 13000 <5.0 <5.0 <5.0 na na 55 <5.0 <50 <500 <50 am petrol.odorino sheen 50'-65' 06!03199 39000 10000 1600 2900 11000 <0.50 <0,50 <0.50 5 <0.50 <5.0 <50 < .23 am no comment 08/30/99 50000 9200 1500 3500 12000 86 <20 <20 .0 930 m no comment <20 <200 <2000 <200 850 6 644 54.44 n 56.53 nm no comment 12110!99 64000 9300 2200 2800 9700 <20 <20 <20 <20 <200 <10000 <200 710 42 56.61 03103100 as as as as as as as as as as as as as ns _ nm am no comment 06122100 as as ns as ns as as as as as as as as ns` am am dry 09128100 as as ns as ns ns as as as as as as as as nm nm dry 12122!00 55000 6400 1600 3200 5400 <200 na na nana na na na na 56.01 nm dry 03!28!01 41000 5200 2000 2700 4600 <200 na na na na na na na na 55.00 nm odor!no sheen 06/27/01 28000 000 <200 370 5000 580 3000 1900 <20 <20 <20 <20 <200 <2 nm odor!no sheen 58 A5 nm odor!nosheen 09/06/01 26000 2900 410 2600 840 <100 na na na na na na na na a 58.45 12104101 22000 2000 550 2400 1200 <100 na na na na na na na na 59.1D nm odor lno sheen 03101!02 20000 1900 110 2500 1400 <100 na na na na na na na na 59.15 nm odor lno sheen 05120102 18000 1300 430 2000 1600 <10 <10 <40 < nm Odor Ino sheen 08!30!02 20000 10 <100 <1000 <400 130 <10 58.09 27.74 -30.35 no odor/no sheen 1500 460 2300 1300 <100 na na na na na na na na 61.04 12!06!02 36000 3600 1000 3000 4300 <20 na na na na na na na na 61.44 -33.30 odor lno sheen 03!07103 45000 4600 2400 3100 6700 <200 na na na na na na na na 60.37 33,70 odor lno sheen 06/03/03 38000 5300 710 3100 4800 <20 <20 <20 <20 <200 <2000 <200 <20 <20 59.77 -32.63 odor!no sheen -32.03 odor I no sheen 474gmN0.1Js Project No.1474.44 Page 7 of 8 HORIZON ENVTROMME14TAL INC.