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TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No.12474 3440 East Main Street.Stockton,California ethyl- total Depth to TQC GW Well TPH9 benzene toluene benzene xylenes MTBE RIPE ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date u 1L u 1L u 1L u 1L u 1L u 1L u IL u !L u IL u 1L u 1L u 1L u IL u 1L feet feet msl feet"I Comments VW-2 03/03100 ns ns ns ns ns ns [ns ns ns ns nm ns ns ns nm screened 06!22100 ns ns ns ns ns ns ns ns ns ns nm nm dry ns ns ns nm nm dry Interval 09128100 ns ns ns ns ns ns ns ns ns ns ns ns ns nm 37-47' 12122100 ns ns ns ns ns ns ns ns ns ns nm dry ns ns ns nm nm dry !28!01 ns ns ns ns ns ns ns ns ns ns ns ns ns nm 06127101 ns ns n$ ns ns ns ns ns ns as nm dry 09/06/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 12/04/01 ns ns ns ns ns rtm nm dry ns ns ns ns ns ns ns ns ns ns ns ns nm 03/01102 n$ ns ns ns ns ns ns ns ns ns ns nm dry 05!20102 ns ns ns ns ns ns ns ns ns ns ns n5 ns ns nm nm dry ns ns ns nm nm dry VW-303103!00 ns ns ns ns ns ns ns ns ns ns nm ns ns m ns nnm nm screened 06122100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm dry Interval 09128100 ns n$ ns ns ns ns ns ns ns ns ns nm dry 23-33' 12/22/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nnrnm nm dry 03128!01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 06!27!01 ns ns ns ns ns ns ns ns ns ns ns nm dry 09106101 ns ns ns ns ns ns ns ns nm ns ns ns ns ns ns ns ns ns nm nm dry 12/04/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 03!01102 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 05120/02 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry nm dry VW-4 09/08/98 86000 19000 6900 3100 20000 1.4 <0.50 <0.50 <0.50 <5.0 74.0 <5.0 na na 59.10 nm nm strong odor/no sheen screened 12!30!98 79000 29000 1600 3700 16000 <100 na na na na na na na na 57.28 Interval 03/25/99 89000 14000 2700 3200 13000 <5.0 <5,0 <S.p <5.0 <50 < nm Petrol,odorino sheen 500 <50 na na 55.23 nm no oommenl 50'-65' 06103!99 39000 10000 1600 29DO 11000 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 930 12o 54.44 08130!99 50004 9200 1500 3500 12000 86 <20 <20 < nm no comment 12l10f99 54000 9300 2200 2800 9700 c2D <20 < 0 c20 <200 <2000 <200 850 64 56.53 nm no comment 03/03/00 D ns ns 2 20 <200 <10000 <200 710 42 56.61 nm no comment ns ns ns ns ns ns ns ns ns ns ns nm 06/22/00 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 55000 6400 1600 3200 5400 <200 na na na na na na na na 56.01 nm dry 03!28101 41000 5200 2000 2700 4600 <2D0 na na na na na no na na 55.00 nm odor sheen 06/27101 28000 5000 580 3000 19W <20 <20 <20 <20 < nm odorinp sheen 09106/01 26000 2900 410 2800 840 <100 na na na 200 <2000 <n00 370 <20 56.42 nm odor!no sheen 12/04/01 2200o 2000 550 2400 1200 <100 na na na na na na na na 59.10 nm odor!no sheen 03/01/02 20000 1900 110 25W 1400 <100 na na na na na na na na 57.95 nm odorIno sheen 05/20/02 18000 1300 430 2000 1600 <10 <10 c10 <10 <700 < nm odor!no sheen 08130102 20000 1500 460 2300 1300 c100 na na na na 2300 <100 na 0 1 61.04 58.09 11 27.74 -30,35 no odor 1 no sheen 12!06!02 36006 3600 1000 3000 4300 <20 na na na na na na na na 61.44 -33.30 odor I no sheen -33.70 odor lno sheen I i h I I 474gmt00,t1i vrolea r4o.1474.44 Page 7 of 8 HORIZON JErMRONMBNTAL INC.