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TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No.3641 1210 E.Hammer Lane,Stockton,California Depth In TQC GW Well TPH9 benzene toluene ethylbenzene xylenes MTBE RIPE ETRE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date jug/1) (u /1) (u /1) (u (ug/1) (u /1) (u /I u ) (u /1) (ug/4 (u ) (u /I) W11) (u /4 (feet) feet msi) (lea[msl) Comments VW-7 03/25/99 25000 5700 3300 1500 1700 2000 <5.0 <5.0 <5.0 200 <50 <5.0 na na 41.67 nm nm slight odor/no sheen screened 06/02/99 11000 3300 320 1100 230 1700 <5.0 -5.0 <5.0 92 <100 <5.0 <5.0 <5.0 41.94 nm slight odor/no sheen interval 08/31/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 47.35 nm 0.21 ft FP/Sheen 40'-55' 12/09/99 67000 2300 1000 1500 5400 6400 <50 <50 <50 <500 <5000 <500 <50 <50 45.26 nm no comment 03/01/00 11000 2200 160 640 640 4300 <50 -50 <50 <500 <5000 <500 na na 42.47 nm no comment 06/06/00 15000 2400 440 620 1100 3000 <5.0 <5.0 <5.0 280 <2000 <50 <5.0 <5.0 41.50 nm .clear 09/14/00 46000 440 560 1600 3000 1000 <5.0 <5.0 <5.0 76 <600 <50 <5.0 <5.0 47.81 nm ciearlsheen 12/12/00 17000 940 420 450 1600 5200 na na na na na na na na 44.16 nm clear 03/19/01 4100 650 16 180 94 2900 na na ne na na na na na 41.38 nm clear 06/19/01 24000 2800 870 770 1800 7300 na na na na na na na na 43.86 nm clear 09/27/01 $1000 1400 3900 1800 6800 1400 na na na na na na na na 50.01 nm clear 12/13/01 4400 270 70 140 240 2000 na na na na na na na na 46.57 nm clear 03/28/02 24000 1100 760 850 2100 2500 na na na na na na na na 43.14 19.29 -23.85 clear 06/19/02 36000 2600 2000 1200 4600 5100 na na na na na na na na 44.89 -25.60 clear 09/16/02 57000 2400 5000 1600 6300 2800 <10 <10 <10 150 <2500 <100 <10 <10 50.20 -30.91 clear 12!26102 3100 200 30 110 78 2000 na na na na na na na na 47.45 -28.16 clear 03/26/03 3500 170 20 280 83 2600 na na na na na na na na 45.14 -25.85 clear 06/27/03 30000 1900 1700 1000 4200 4700 <20 -20 <20 <200 <2000 <200 <20 na 46.87 -27.58 clear 09/19/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry dry dry 12/30/03 140000 7600 13000 3900 21000 5300 na na na na na na na na 49.77 -30.48 clear 03!26104 87000 730 1800 2600 12000 2500 <25 <25 <25 <150 <2500 <250 <25 na 47.21 -27.92 sheen 06117/04 120000 6800 7100 3000 15000 11000 <50 <50 <50 520 J <40000 <500 <50 na 51.25 -31.96 clear 09/09/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry dry dry 12/16/04 100000 2700 3700 3000 15000 4900 na na na na na na na na 53.32 -34,03 clear Nines: TPI Ig=anal petroleum bydromrbens as gasoline µE11=micrograms per liter(part%per billion or ppb) M'11iE=methyl-t-butyl erher GW=grouedmarer DIP]-=diisoprepyl ether TUC=lop of casing IFFBE=dhyl-t-butyl ether na=net analyzed TAME=%err-betanin nm=not measured TBA=len-butyl alwhol FP=free product DCA=1,2'dichluruelhane 7=biased slightly high;.we analytical report EDS=1,24hromoethane 641gmr.Rls Project No.1641.47 Page 9 of 9 HORIZON ENVIRONMENTAL.INC.