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TAS 1 Groundwater Monitoring Data Beacon Station No 3641 1210 E Hammer Lane,Stockton,California Depth to TOC GW Well TPHg benzene toluene ethylbenzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol EDC ED8 GW Elevation Elevation Number Date (ug/1) (,.g11) (Ug") (ugll) (ug") (ugA) (ug11) (ugA) (Ug") (ug11) (ug11) (Ug/1) (ii9 l) NO) (feet) (feet msl) (feet msl) Comments VW-6 03/25199 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm nm screened 06/02/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm interval 08/31/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 4773 nm sheen 22 32 12/09/99 ns ns ns ns ns ns ns its ns ns ns ns ns ns nm nm dry 03/01/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 06/06100 ns ns ns ns ns ns ns its ns ns ns ns ns ns nm nm dry 09/14100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 12112/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 03119/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 06119/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 09/27/01 ns ns ns ns ns ns ns ns rs ns ns ns ns ns dry nm dry 12/13/01 ns ns ns ns ns ns ns ns rs ns ns ns ns ns dry nm dry VW 7 03/25/99 25000 5700 3300 1500 1700 2000 <50 <5 0 <5 0 200 <50 <50 na na 4167 nm nm slight odor 1 no sheen screened 06/02/99 11000 3300 320 1100 230 1700 <50 <5 0 <5 0 92 <100 <50 <5 0 <5 0 41 94 nm slight odor!no sheen lnlerval 08/31/99 ns 1115 ns ns ns ns ns ns Its ns ns ns ns ns 4735 nm 0 21 ft FPtsheen 40-55 12/09/99 87000 2300 1000 1500 5400 6400 <50 <50 <50 <500 <5000 <500 <50 <50 4526 nm no comment 03/01/00 11000 2200 160 640 640 4300 <50 <50 <50 <500 <5000 <500 na na 4247 nm no comment 06106/00 15000 2400 440 620 1100 3000 <50 <50 <5 0 280 <2000 <50 <50 <5 0 41 50 nm Gear 09/14/00 46000 440 560 1600 3000 1000 <5 0 <50 <5 0 76 <600 <50 <50 <5 0 4781 nm Geadsheen 12112/00 17000 940 420 450 1600 5200 na na na na na na na na 4416 nm clear 03/19/01 4100 650 16 180 94 2900 na ria na na na na na na 4138 nm clear 06/19/01 24000 2800 870 770 1800 7300 na na na na na na na na 4386 nm Gear 09/27/01 51000 1400 3900 1800 6800 1400 na na na na na na na na 5001 nm clear 12113/01 4400 270 70 140 240 2000 na na na na na na na na 4657 nm clear VW-8 03!25199 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm nm dry screened 06/02/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry Interval 08/31199 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 22 32 12109/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 03/01/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 06/06/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 09/14/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 12/12/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 03/19/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 06/19/01 ns ns ns ns ns ns ns ns ns ns ns its ns ns dry nm dry 09127/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 12/13/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry Motes TPHg=total petroleum hydrocarbons as gasoline µg11-micrograms per liter(parts per billion or ppb) MTBE-methyl ten butyl ether GW=groundwater DIPE=dusopropyl ether TOC=top ofcasmg ETBE=ethyl ten butyl ether na=nor analyzed TAME=ten amyl methyl ether FP=free product TBA-tert butyl alcohol ns-not sampled 641gmr01 As 164144 Page 6 of 6 HORIZON ENVIRONMENTAL INC