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TABLE 1 j GROUNDWATER MONITORING DATA Beacon Station No.12474 3440 East Main Street,Stockton,California ethyl- total Depth to TOC GW Well TPHg enzonetoluenobanzenoxylenes MTBE DIPE ETBE TAME TBA methanolethanol EDC EDB GW Elevation Elevation Number Date1(ug1L) u1L (ug/L u 1L u !L u IL u IL ug/L)( (ug/L (ug/L (ug/L (ug/L).( u 1L (ua/ feet feet msl feet msl Comments VW-3 03/03/00 ns ns ns ns ns ns ns ns ns ns nm ns ns ns nm nm dry screened 06122/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry interval 09/28/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm 23'-33' VWA 09/08/98 86,000 19,000 6900 3100 20,000 1.4 <0.50 <0.50 <0.50 <5.0 74.0 <5.0 59.10 nm nm strong oder 1 no sheen screened 12/30/98 79,000 29,000 1600 3700 16,000 <100 na na na na na na 57.28 nm Petrol.odor I no sheen interval 03/25/99 89,000 14,000 2700 3200 13,000 <5.0 <5.0 <5.0 <5.0 <50 <500 <50 55.23 nm no comment 50'-65' 06/03/99 39,000 10,000 1600 2900 11,000 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 930 120 54.44 nm no comment 08/30/99 50,000 9200 1500 3500 12,000 86 <20 <20 <20 <200 <2000 <200 850 64 56.53 nm no comment 12/10/99 64,000 9300 2200 2800 9700 <20 <20 <20 <20 <200 <10,000 <200 710 42 56.61 nm no comment 03103/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 06122/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 09/28100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm VW-5 03/03100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry screened 06122/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry interval 09128/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm 37'-47' VW-6 03/03/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry screened 06/22/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nrn dry interval 09/28/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm 23'-33' VW-7 03/03/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry screened 06/22100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry interval 09/28/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm 37'-47- Notes: TPHg=total petroleum hydrocarbons as gasoline EDC=1,2-dichloroethane <=less than indicated reporting limit MTBE=methyl terl-butyl ether EDB=1,2-dibromoethane ns=not sampled DIPE=diisopropyl ether GW=groundwater nm=not measured ETBE=ethyl tent-butyl ether TOC=top of casing TAME=tert-amyl methyl ether msl=mean sea level TBA=lert•butanol 474gmr00,x1s 1474.43 Page 5 of 5 HORIZON ENVIRONMENTAL INC.