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TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No. 3641 1210 E.Hammer Lane, Stockton, California ethyl- Depth to TOC GW Well �(ug/') (ug/l) nzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date (U21) (U211) (ug/1) u A (ug/l u it (ug/1) (ug/1) (ug/1) (ug/1) (ug/1) (ug/1) (feet) feet msl (feet msl) Comments VW-7 3125199 25000 5700 3300 1500 1700 2000 <5.0 <5.0 <5.0 200 <50 <5.0 na na 41.67 nm nm slight odor 1 no sheen screened 612199 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 1 no sheen interval 6131199 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 47.35 nm 0.21 ft FP/sheen 40'-55' 1219199 87000 2300 1000 1500 5400 6400 <50 <50 <50 <500 <5000 <500 <50 <50 45.26 nm no comment 311100 11000 2200 160 640 640 4300 <50 <50 <50 <500 <5000 <500 na na 42.47 nm no comment 616100 15000 2400 440 620 1100 3000 <5.0 <5.0 <5.0 260 <2000 <50 <5.0 <5.0 41.50 nm clear 9114100 46000 440 560 1600 3000 1000 <5.0 <5.0 <5.0 76 <600 <50 <5.0 <5.0 47.81 nm clear/sheen 12/12/00 17000 940 420 450 1600 5200 na na na na na na na na 44.16 nm clear 3119101 4100 650 16 180 94 2904 na na na na na na na na 41.38 nm clear 6119101 24000 2600 870 770 1800 7300 na na na na na na na na 43.86 nm clear 9127101 51000 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 3128102 24000 1100 760 850 2100 2500 na na na na na na na na 43.14 19.29 -23.85 clear 6119102 36000 2600 2000 1200 4600 5100 na na na na na na na na 44.89 -25.60 clear 9116102 57000 2400 5000 1600 6300 2800 <10 <10 <10 150 <2500 <100 <10 <10 50.20 -30.91 clear 12/26/02 3100 200 30 110 78 2000 na na na na na. na na na 47.45 -28.16 clear 3126103 3500 170 20 280 83 2600 na na na na na na na na 45.14 -25.85 clear 6127103 30000 1900 1700 1000 4200 4700 <20 <20 <20 <200 <2000 <200 <20 na 46.87 -27.58 clear 9119103 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 3126104 87000 730 1800 2600 12000 2500 <25 <25 <25 <150 <2500 <250 <25 na 47.21 -27.92 sheen 6117104 120000 6800 7100 3000 15000 11000 <50 <50 <50 520 J <40000 <500 <50 na 51.25 -31.96 clear 919104 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 313105 12000 79 210 160 1100 910 <1.5 <1.5 <1.5 2400 <150 <15 <1.5 na 49.22 -29.93 clear 6116105 14000 590 8.7 740 230 2200 na na na na na na na na 48.58 -29.29 slight sheen Notes: TPHg=total petroleum hydrocarbons as gasoline µg/1=micrograms per liter(parts per billion or ppb) MTBE=methyl-t-butyl ether GW=groundwater DFPE=diisopropyl ether TOC=top of casing ETBE=ethyl-t-butyl ether na=not analyzed TAME=tert-butanol run=not measured TBA=tert-butyl alcohol FP=free product DCA= 1,2-dichloroethane J=biased slightly high;see analytical report EDB=1,2-dibromoethane - 641gmr.x1 ' Project W ":.48 Paget++,;if 13 HORIZON ENVIRONME'_�:INC.