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Table 1 Groundwater Monitoring Data Former Beacon Station No 419 2350 Waterloo Road,Stockton,California Well Date TPHg Benzene Toluene E-benzene Xylenes Depth to TOC GW Number u L u u ug& ugfL GW Elevation Elevation Comments MW-6 03/31/98 110 <0 50 <0 50 <0 50 <0 50 4836 2066 -2770 (screened 06/10/98 79 <0 50 <0 50 <0 50 <0 50 4268 -2202 interval= 09/08/98 <50 086 077 <0 50 <0 50 4697 -2631 no odor/no sheen 48'-71 Y:') 12/02/98 20.65 Wellhead Survey Data 12/30/98 53 <0 50 <0 50 <0 50 <0 50 4S 57 -2492 no odor/no sheen 03/26/99 84 <0 50 <0 50 <0 50 <0 50 4125 -2060 no odor/no sheen MW-7 11/12/98 20.55 Wellhead Survey Data (41'-66') 12/30/98 340 48 10 7 4 22 4543 -2488 no odor/no sheen 03/26/99 550 94 <0 50 <0 50 <0 50 4133 -2079 no odor/no sheen MW-8 11/12/98 20.38 Wellhead Survey Data (41'-66') 12/30/98 68 12 076 <0 50 0 81 4536 -2498 no odor/no sheen 03/26/99 58 <0 50 <0 50 <0 50 <0 50 4108 -2070 no odor/no sheen MW-9 11/12/98 2065 Wellhead Survey Data (41'-66') 12/30/98 1,500 73 18 160 64 4559 -2494 slight odor 1 no sheen 03/26/99 1,300 54 5 8 110 15 4139 -2074 no odor 1 no sheen MW-10 1 12/02/98 20.87 Wellhead Survey Data (41'-66') 12/30/98 180 <0 50 <0 50 <0 50 <0 50 4584 -2497 no odor/no sheen 03/26/99 140 064 <0 50 <0 50 072 4165 -2078 no odor/no sheen VW-1 03/26/99 260,000 3,000 1,800 9,100 44,000 4158 nm nm slight odor/no sheen (34'-44) Notes TPHg=total petroleum hydrocarbons as gasoline gg/L= micrograms per liter=parts per billioin(ppb) run=not measured B=benzene E=ethylbenzene GW=Groundwater na=not analyzed T=toluene X=xylenes TOC= fop Of Casing <=less than indicated detu tion lnnit Depths and Elevations rei orded in feet 99QMTable Q1 Page 2 of 2 HORIZON ENVIRONMENTAL INC.