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TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No.3641 1210 E.Hammer Lane,Stockton,California Depth Ic TOC Gw Well TPHg nenzene toluene ethylbenzene xylenes MTBE DIPS ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number I Date (U011) (ug/1) NO) u R u A u l u A u 11 u 11 u R MOO Wall)- NO) (u 11)( feet feet msf feet msl Comments VW-7 03125/99 25000 5700 3300 1500 1700 2000 <5.0 <5.0 <5.0 200 <50 <5.0 no no 41.67 nm nm slight odor 1 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 08131!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 87000 2300 1000 1500 5400 6400 <60 <50 <50 <500 <5000 <500 e50 <50 45-26 nm no comment 03101/00 11000 2200 160 640 640 4300 <50 <50 <50 <500 <5000 <500 na no 4247 nm no comment 06106!00 15000 2400 440 620 1100 3000 <5.0 <5.0 <5.0 280 <2000 <50 <5.0 <5.0 41.50 nm clear 09/14100 46000 440 560 1600 3000 1000 <5.0 <5.0 <5.0 76 <600 <50 <5.0 -5.0 47.81 nm clearlsheen 12112100 17000 940 420 450 1600 5200 no no na no no no na no 44.16 nm clear 03/19101 4100 650 16 180 94 2900 no na no no no no no no 41.38 nm clear 06119101 24000 2800 870 770 1800 7300 no na na na no no no na 43.86 nm clear 09/27101 51000 1400 3900 9800 6800 1400 no no no no no no na no 50.01 nm clear 12113101 4400 270 70 140 240 2000 no na no no no na no na 46.57 nm clear 03/28/02 24000 1100 760 850 2100 2500 no no no no no no no ria 43.14 19.29 -2385 clear 06/19102 36000 2600 2000 1200 4600 5100 no na no na no na net 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 12J26102 3100 200 30 110 78 2000 no no no no no no no no 47.45 -28.16 clear 03/26103 3500 170 20 280 83 2600 no no na no no no na no 45.14 -25.85 clear 06/27/03 30000 1900 1700 1000 4200 4700 <20 <20 <20 <200 <2000 <200 <20 no 4687 -27.58 clear 09/19103 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry dry dry 12/30103 140000 7600 13000 3900 21000 5300 no no no no no no no no 49.77 -30.48 clear 03/26/04 87000 730 1800 2600 12000 2500 <25 <25 <25 <150 <2500 <250 <25 no 47.21 -27.92 sheen 06/17104 120000 6800 7100 3000 15000 11000 <50 <50 <50 520 J x40000 <500 <50 no 51.25 -31.96 clear 09/09104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry dry dry 12116104 100000 2700 3700 3000 15000 4900 no na no no no no no no 53.32 -34.03 clear 03103105 12000 79 210 160 1100 910 0.5 <1.5 <1.5 2400 <150 <15 <1.5 no 49.22 -29.93 clear Notes: TPHg=total petroleum hydrocarbons as gasoline µg11=micrograms per liter(parts per bill Von or pph 1 MTBE=memyl-t-butyl ether GW=groundwater OJPE=diisepropyl ether TOC=top of casing ETRE-edtyl-i-butyl ether na=not analyzed TAME=len-butanol nm=not measured TBA-tent-butyl alcohol FP-free product DCA=1,2-dichloroethane J=biased slightly high;see analytical report EDB=1,2-dibromoethane 6419mr-is Project No.l6+y.: Pa y-" I 9E:::�::i 1Q HORIZON ENVIRONl1h: _:?sSAL INC. ,