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Table X
<br /> Groundwater Monitortng Data
<br /> Beacon Station No 641
<br /> 1210 E Han ner Lane,Stockton,California
<br /> Nell Date TPHg B T E X MTBE DIPE ETBE TAME TBA Meth Eth EDC EDB Depth to TOC GW
<br /> Number u /L u IL u /L u u /L u /L u /L u /L u u /L u /L u j u /L u GW Elevation Elevation Comments
<br /> MW-5 10/02/97 87,000 21,000 10,000 2,000 10,000 3,800 <5 0 <50 <5 0 <500 <50000 <t0000 na na 5733 9958 4225 no sheen,no odor
<br /> screen 03131/98' 10,000 2 100 1,500 270 710 530 na na na na na na na na 4919 5039 no sheen, odor
<br /> interval 06/10/98 3,100 510 470 45 310 180 na na na na na na na na 4622 5336 no sheen, odor
<br /> 50'-75' 09/08198 24,000 6 500 1,000 920 1,400 4,500 <25 <25 34 48 3,600 <25 na na 4955 5003 no sheen, odor
<br /> 12/30/98 340 32 <25 2 9 <2 5 980 na na na na na na na na 4410 5548 no sheen, odor
<br /> 03/25/99 540 100 1 8 12 36 280 <10 <10 <10 <100 <50 <50 na na 4147 58 it odor/no sheen,
<br /> 06/02/99 2700 1200 83 230 120 1200 <050 <0 50 <050 51 <50 <50 <0 50 <0 50 4251 5707 odor 1 no shun,
<br /> SW-1 10/02/97 ns ns as ns ns ns ns ns ns ns ns ns na na 5657 rnn nm ns
<br /> screen 03/31/98 ns ns ns ns ns ns Its ns its ns ns ns na na 5123 nm ns
<br /> Interval 06/10/98 Its ns ns ns Its ns ns ns ns ns ns ns na na 4584 tun as
<br /> 60 65' 09108!98 lis its ns ns ns ns ns ns ns ns ns ns na na 4926 run na
<br /> t2/30/98 ns ns ns ns ns ns ns ns Its ns ns ns na na 4199 nm ns
<br /> 03/25/99 90 <0 50 071 <0 50 053 71 <0 50 <0 50 055 <5 0 <50 <50 na na 4195 nm slight odor I no sheen
<br /> 06/02/99 130 089 <0 50 <0 50 <050 130 <0 50 <0 50 <050 <5 0 <50 <50 <050 <0 50 4224 am shot odor/no sheen
<br /> VW-1 screened 441 to 54'
<br /> 03/25/99 1 20,000 4,000 2,000 900 1,700 3,000 <50 <50 <50 <50 <50 640 na na 4170 nin slight odor/no sheen
<br /> 06/02/99 23,000 5,800 2,300 1,100 1,900 8,300 <50 <50 <50 240 <100 <10 <50 <50 4221 nm slight odor/no sheen
<br /> VW-2 screened 21'to 36'
<br /> 03/25/99 1 ns ns ns ns ns ns ns ns tis as ns ns ns ns dry well dry @ 34 82'
<br /> 06/02/99 ns ns ITS ns ns ns ns ns ns ns ns ns ns ns dry no comment
<br /> VW-3 screened 45'to 55'
<br /> 03125/99 1 33,000 1,600 8,100 1,800 5,400 660 <50 <50 <50 140 <50 <5 0 4207 nm slight odor I no sheen
<br /> 06102/99 13,000 6,000 180 1,400 300 4,000 <0 50 <0 50 26 85 <200 <50 <0 50 <0 50 4245 nni slight odor/no sheen
<br /> VW-4 screened 25'to 40'
<br /> 03/25/99 1 its ns ns ns ns ns ns ns tis ns ns ns ns ns dry well dry @ 39 19'
<br /> 06/02/99 ns ns as ns ns ns ns ns tis ns ns ns ns tis dry no comment
<br /> VE-7 screened 40'to 55'
<br /> 03125199 25,000 5,700 3 300 1,500 1,700 2,000 <5 0 <50 <50 200 <50 <50 na na 4167 nm slight odor 1 no sheen
<br /> 06/02/99 1 11,000 3,300 320 1,100 230 1,700 <5 0 <5 0 <50 92 <100 <5 0 <50 <5 0 41 94 nm slight odor/no sheen
<br /> VE 8 screened 22'to 32'
<br /> 03/25/99 ns ns ns ns ns ns ns ns ns us ns ns ns its
<br /> dry well dry @ 3175'
<br /> 06/02/99 ns ns Its tis its ns ns ns tis as ns ns ns nsdry no comment
<br /> Notes
<br /> TPI Ig=told petroleum In di ocirltons as gisolmc The seven otygcailed fuel additive compounds by_EPA I%Uthod V60B lige = nucrograms per liter=parts per billion(ppb)
<br /> 13=benaene M i l71 =methyl tertiary-but)I ether 1`13 A=leritaiv butyl alcohol GW=Groundwater
<br /> T=toluene DIPE=di-isopropyl enter Meth =methanol TOC=Top Of Casing
<br /> F=elhvlben7ene 1-113E-ethvl Iennry bull l ether I Ili =etlianol na=not analvzed
<br /> t=X}Ienes TAME-ternir)amyl meth}I efher Depths and Elevations recorded in feet
<br /> I
<br /> 99gmtbl 641 Page 2 of 2 HORIZON ENVIRONMENTAL INC
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