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TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No.3641 1210 E.Hammer Lane,Stockton,California Depth to TOC GW Well ETPHg benzene toluene ethylbenzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Date ugll) (ugn) (uglq (ugl1) (ugll) NO) (ug/1) (uglq (Ug/1) (ug/1) (ug/1) (ug/1) (ug/1) (feet) (feet msl) (feet msl) Comments VW-2 03125/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm nm dry screened 06102/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry interval 08131/99 ns ns ns ns ns ns ns ns ns ns ns ns ns no nm nm dry 21'-36' 12109/99 ns ns ns ns ns ns ns ns no ns ns ns ns ns nm nm dry 03101!00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 06106100 ns ns ns ns ns ns ns ns no ns ns ns ns ns nm nm dry 09114/00 ns ns ns ns ns ns ns ns ns ns ns no ns ns nm nm dry 12112/00 ns ns ns ns ns ns ns ns ns ns ns no ns ns nm nm dry 03119/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 06119/01 ns ns ns ns ns ns ns ns ns ns ns no ns ns nm nm dry 09127101 ns ns ns ns ns ns ns ns ns ns ns no ns ns nm nm dry 12113101 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 03!28102 no ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 06119102 ns ns ns no ns ns ns ns ns ns AS ns ns ns nm nm dry 09116102 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 12126/02 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 03126103 ns ns ns ns ns ns ns ns ns ns ns no ns ns nm nm dry 06127103 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 09!19103 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 12/30/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 03/26104 no ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 06117!04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry VW-3 03!25199 33000 1600 8100 1800 5400 660 <5.o <5.0 <5.0 140 <50 <5,0 no na 42.07 nm nm slight odor!no sheen screened 06!02199 13000 6000 160 1400 300 4000 <0.50 <0.50 2.6 as <200 <5.0 <0 50 <0.50 42.45 nm slight odor 1 no sheen interval 08/31/99 11000 860 230 470 140 6900 <10 <10 <10 300 <1500 <100 <10 <10 47.66 nm no comment 45'-55' 12109/99 11000 1200 550 560 430 6200 <5.0 <5.0 <5.0 100 <500 <50 <5.0 <5.0 45.60 nm no comment 03101100 12000 500 440 680 980 5000 <20 <20 <20 <200 <2000 <200 no no 42.94 nm no comment 06106/00 5900 1400 170 340 260 5600 <2.0 <2A 3.9 260 <2000 <20 <2.0 <2.0 42.00 nm clear 09114/00 2600 760 52 65 120 2400 <2.0 <2.0 <2.0 110 <250 <20 <2.0 <2.0 48.28 nm clear 12112100 3700 220 180 140 280 5500 no na na na na no no no 44.63 nm clear 03119101 2600 110 72 150 160 2700 no na na na na no na na 41.81 nm clear 06119/01 11000 2900 450 280 860 6700 no no no no no no no no 44.50 nm clear 09127/01 860 78 10 12 26 1700 na ne na na na na na no 50.45 nm clear 12113!01 1300 280 21 33 62 2400 no no no no no no na na 46.99 nm Gear 03128!02 2900 91 52 150 170 2200 no na no na no no no no 43.63 20.06 -23.57 clear 06119/02 10000 2300 2a0 350 1100 5400 no no no no na no no na 45.46 -25.40 clear 09116/02 1400 170 34 52 74 1900 <5.0 <5.0 <5.0 62 <500 <50 <5.0 <5.0 50.66 clear 12126102 1100 75 16 41 60 1600 na na na na ne no no no 47.95 -27.ag Gear 03126103 2100 150 15 64 150 1900 na no no no no no na na 45.55 -25.49 clear 06127/03 6200 1600 100 130 390 6500 <10 <10 <10 <100 <1000 <100 <10 na 47.41 -27.35 clear 09119/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 12130/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 50.17 -30,11 clear 03!26104 2200 590 12 32 130 2700 <10 <10 <10 <100 <1000 <100 <10 na 47.70 -27.64 Gear 06117104 no ns ns ns ns ns ns ns ns ns ns ns ns ns 51.65 -31.59 FICA sampled 641gmr.ds Proles No.1641.47 Page 8 of 11 HORIZON ENVIRONMENTAL INC.