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<br /> Table 1
<br /> Groundwater Monitoring Data
<br /> Beacon Station No 641
<br /> 1210 E-Hammer Lane,Stockton,California
<br /> Wen Date TPHg B T E X MTBE DIPE ETBE TAME TBA Meth. Eth. EDC EDB Depth to TOC GW
<br /> Number n UgIL n u ugj u u u ug/j, ug/1, u ugfL ug/f, ugtL GW Elevation Elevation Comments
<br /> 5W-1 10/02/97 ns ns ns ns ns ns ns ns ns ns m ns na na 5657 tun rim ns
<br /> screen 03131/98 ns ns ns ns ns ns ns as ns ns ns ns na na 5123 tun ns
<br /> interval 06/10/98 ns ns ns ns ns ns ns ns ns its ns ns na na 4584 nm ns
<br /> 60'-65' 09/08/98 ns ns ns ns ns ns ns ns ns ns ns ns na na 4926 tun ns
<br /> 12/30/98 ns ns ns ns ns ns ns ns ns ns ns ns na na 4399 tun ru
<br /> 03/25/99 90 <0 50 071 <0 50 053 71 <0 50 <0 50 055 <5 0 <50 <5 0 na na 4195 nm slight odor/no sheen
<br /> 06/02/99 130 089 <0 50 <0 50 <0 50 130 <0 50 <0 50 <0 50 <5 0 <50 <5 0 <0 50 <0 50 4224 run slight odor/no sheen
<br /> 08/31/99 1,000 150 53 45 31 1,400 <0 50 <0 50 065 54 <100 <5 0 <0 50 <0 50 4781 nm no comment
<br /> VW-1 screened 44'to 54'
<br /> 03/25/99 20,000 4,000 2,000 900 1,700 3,000 <5 0 <5 0 <5 0 <5 0 <50 640 na na 4170 tun nm slight odor 1 no sheen
<br /> 06/02/99 23,000 5,800 2,300 1,100 1,900 8,300 <50 <5 0 <5 0 240 <100 <10 <5 0 <5 0 4221 run sbght odor/no sheen
<br /> 08!31/99 50,000 14,000 11,000 2,300 6,200 20,000 <5 0 <5 0 72 770 <2500 <50 <5 0 <5 0 4731 nm no comment
<br /> V W-2 screened 21'to 36'
<br /> 03/25/99 ns ns ma ns ns ns ns ns ns ns ns ns ns ns dry nin well dry®34 82'
<br /> 06/02/99 ns ns ns ns ns tis ns ns ns ns ns ns ns ns dry no comment
<br /> 08/31/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry no comment
<br /> VW-3 screened 45'to 55'
<br /> 03/25/99 33,000 1,600 8,100 1,800 5,400 660 <5 0 <5 0 <50 140 <50 <50 na na 4207 nm nm slot odor 1 no sheen
<br /> 06/02/99 13,000 6,000 1.80 1,400 300 4,000 <0 50 <0 50 26 85 <200 <5 0 <0 50 <0 50 4245 nm shot odor 1 no sheen
<br /> 08/31/99 11,000 860 230 470 140 6,900 <10 <10 <10 300 <1500 <100 <10 <10 4766 tun no comment
<br /> VW-4 screened 15'to 401
<br /> 03/25/99 ns ns ns ns ns ns ns ns ITS ns ns m ns ns dry tun web dry @ 3918'
<br /> 06102/99 ns ns ns ns ns ns ns Its ns ns ns ns ns ns dry no comment
<br /> 08131/99 ns ns its ns ns ns ns ns ns m ns ns ns ns dry no comment
<br /> vW-5 08!31/99 ns ns ns ns ns ns ns ns ns ns m ns ns ns 4773 rim nm sheen
<br /> VW-6 08/31/99 ns ns ns ns ns ns ns ns ns ns m ns ns ns dry tun rim no comment
<br /> VW-7 screened 40'to 55'
<br /> 03/25/99 25,000 5,700 3,300 1,500 1,700 2,000 <5 0 <5 0 <5 0 200 <50 <5 0 na na 4167 run nor sbght odor 1 no sheen
<br /> 06/02/99 11,000 3,300 320 1,100 230 1,700 <5 0 <5 0 <5 0 92 <100 <5 0 <5 0 <5 0 4194 nnr sbght odor 1 no sheen
<br /> 08/31/99 ns ns ns ns its ns ns ns ns ns ns ns ns ns 4735 nm sheen
<br /> VW-8 screened 22'to 32'
<br /> 03/25/99 ns ns ns ns nsFns ns ns ns ns ns ns ns ns dry nm wcg dry @ 3175'
<br /> 06/02/99 ns ns ns ns nsns Its tis ns ns ns ns ns dry no corrtmcnl
<br /> 08/31/99 nsnsns nstis tis uS ns ns m ns ns tis dry no comment
<br /> Notes
<br /> TPHg=total pefioleum hydrocarbons as gasoline The seven owacnatcd fuel addmve compounds by EPA Method 92608 µg11 = nucrograms per bier=parts per bilbon(ppb)
<br /> B=benzene 1vffBE=meth)]tertiary butyl ether IBA=teruary butyl ah,uhul GW-Groundwater
<br /> T=toluene DB°E=(h-isopropyl ether Meth =methanol 1 OC= fop Of Casing
<br /> E=ethylbm=c ETRE=ethyl temuy butyl ether Eth =ethanol na=nut anal)Led
<br /> X=xylenes TAME=tertiary amyl methyl ether Depths and hlevalrons iecprded to feet
<br /> 99gmtbl 641 Page 2 of 2 HORIZON ENVIRONMENTAL.INC
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