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i TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No. 12474 3440 East Main Street,Stockton,California ethyl- total Depth to TOC GW Well TPHg benzene toluene benzenexylenes MTBE DIPE ETBE TAME TBA methanolethanol EDC EDB GW Elevation Elevation Number Date (ug/L u 1L u& lug/L)( (ug/L u IL) u 1L u IL (u IL ug/L)() ((ug/L} (ug/L u IL (ug/L feet feet msl feet msi Comments VW-3 03103/00 ns ns ns ns ns ns ns ns ns ns nm ns ns ns nm nm nm dry screened 06/22/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry interval 09128100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 23-33' 12/22100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry VW-4 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 odor/no sheen screened 1 12/30198 79,000 29,000 1600 3700 16,000 <100 na na na na na na 57.28 nm petrol,odor/no sheen interval 03125/99 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' 06103/99 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 08130!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 03/03/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 08/22/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 09128100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 12122!00 55.000 6400 1600 3200 5400 <200 na na na na na na na na 56.01 nm odor I no sheen I VW-5 03/03/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm 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 dry 37-47' 12122!00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry VW-6 1 03/03/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm nm dry screened 06/22/00 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 dry 23-33' 12/22/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry VW-7 03103100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm nm dry screened 06/22/00 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 dry 37-47' 12/22100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry i Notes: TPHg=total petroleum hydrocarbons as gasoline EDC=1,2-dichloroethane <=less than indicated reporting limit MTBE=methyl tent-butyl ether EDB=1,2-dibromoethane ns=not sampled DIPE=diisopropyl ether GW=groundwater nm=not measured ETRE=ethyl tert-butyl ether TOC=top of casing TAME=tert-amyl methyl ether msl=mean sea level TBA=tert-butanol I' 474gmrOD.xls 1474.43 Page 5 of 5 HORIZON ENVIRONMENTAL INC.