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TABLE l 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 EDB GW Elevation Elevation Number Date (ugll) (ugn) (ugn) (ug/1) (uglq (ug/1) (ug/1) (ug/1) (ugn) (ug/1) (ug") (uglt) (ug") (ugn) (feet) (feet msl) (feet msl) Comments VW-6 03/25/99 ns ns as ns ns ns ns ns ns ns ns ns ns ns nm nm nm screened 06102199 ns ns as ns ns ns ns ns as as ns ns ns ns nm nm interval 08/31/99 ns ns as ns as ns as ns ns ns ns ns ns ns 4773 nm sheen 22 32 12/09/99 ns ns ns ns as ns ns ns as as ns ns ns ns am am dry 03/01/00 ns ns as ns ns ns ns ns ns ns ns ns ns ns nm nm dry 06106100 ns ns as ns as ns as ns ns ns as ns ns as nm nm dry 09/14/00 ns ns ns as as ns as ns ns as ns ns ns AS nm nm dry 12/12/00 ns ns as ns ns ns as ns ns ns as as as as dry nm dry 03/19101 as as ns as ns ns as as 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 as ns ns ns ns ns ns ns "ns dry nm dry 12/13/01 ns ns ns as ns as as ns ns ns ns ns ns ns dry nm dry 03/28/02 ns as ns as as as as ns ns as ns ns ns ns dry nm dry 06/19102 ns ns ns as ns ns ns as ns ns ns ns ns ns dry nm dry 09/16/02 ns ns ns as ns as ns as as ns ns as ns ns dry nm dry 12!26102 ns as as ns ns ns ns ns ns as ns ns ns ns 3185 nm dry 03MI03 ns as ns ns ns ns ns ns as ns as ns ns ns dry nm dry VW 7 03/25/99 25000 5700 3300 1500 1700 2000 <5 0 <5 0 <5 0 200 <50 <50 na na 4167 nm nm slight odor 1 no sheen screened 06/02/99 11000 3300 3200 1100 230 1700 <5 0 <5 0 <50 92 <100 <5 0 <5 0 <50 41 94 nm slight odor 1 no sheen interval 08/31/99 ns ns ns ns ns ns ns ns ns as ns ns ns ns 4735 nm 0 21 ft FP/sheen 40'55' 12/09/99 87000 2300 1000 1500 5400 6400 <50 <50 <50 <500 <5000 <500 <50 <50 4526 nm no comment 03101!00 11000 2200 160 640 640 4300 <50 <50 <50 <500 <5000 <500 na na 4247 nm no comment 06/06/00 15000 2400 440 620 1100 3000 <5 0 <50 <5 0 280 <2000 <50 ;,0 <5 0 41 50 nm clear 09114!00 46000 440 560 1600 3000 1000 <5 0 <50 <50 76 <600 <50 <5 0 <5 0 4781 nm clearlsheen 12112100 17000 940 420 450 1600 5200 na na na na na na na na 4416 nm clear 03119101 4100 650 16 180 94 2900 na na na na na na na na 4138 nm clear 06/19/01 24000 2800 670 770 1800 7300 na na na na na na na na 4386 nm clear 09127101 51000 1400 3900 1800 6800 1400 na na na na na na na na 5001 nm Gear 12/13/01 4400 270 70 140 240 2000 na na na na na na na na 4657 nm clear 03/28/02 24000 1100 760 850 2100 2500 na na na na na na na na 4314 1929 2385 clear 06/19/02 36000 2600 2000 1200 4600 5100 na na na na na na na na 4489 2560 clear 09116/02 57000 2400 5000 1600 6300 2800 <10 <10 <10 150 <2500 <100 <10 <10 5020 3091 clear 12126/02 3100 200 30 110 78 2000 na na na na na na na na 4745 2816 clear 03/26/03 3500 170 20 280 83 2600 na na na na na na na na 4514 2585 clear 641gmr xis Project No 1641 46 Page 8 of 9 HORIZON ENVIRONN(ENTAL INC