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i • � TABLE I GROUNDWATER MONITORING DATA Beacon Station No 3641 1210 E Hammer Lane,Stockton,California Depth to TOC GW Well TPH9 benzene toluene ethylbenzene xylenes MTBE DIPE ETRE TAME TBA methanol ethanol :iE GW Elevation Elevation Number Date (ug") (ug/1) u A (ug/1) u A u ll (ug/1) (U211) u A u II u !I u 11 feet feet msl feet ms]) 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 08/31199 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 4773 nm sheen 22 32' 12/09199 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 03/01100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 06/06100 ns ns n$ ns ns ns ns ns 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 03/19101 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 06/19101 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 ns ns ns ns ns ns dry nm dry 12113/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 03/28/02 ns ns ns ns ns ns ns ns ns ns ns ns ns _ins dry nm dry 06/19/02 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 09/16/02 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 12/26102 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 3185 nm dry 03/26/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 06/27/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry VW 7 03/25/99 25000 5700 3300 1500 1700 2000 <5 0 <5 0 <50 200 <50 <5 0 na na 4167 nm nm slight odor!no sheen screened 06102/99 11000 3300 320 1100 230 1700 <50 <5 0 <50 92 <100 <50 <5 0 <5 0 41 94 nm slight odor I no sheen interval 08/31/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 4735 nm 0 21 t7 FP/sheen 40'-55 12/09199 87000 2300 1000 1500 5400 6400 <50 <50 <50 <500 <5000 <500 <50 <50 4526 nm no comment 03/01100 11000 2200 160 640 640 4300 <50 <50 <50 <500 <5000 <500 na ria 4247 nm no comment 06/06100 15000 2400 440 620 1100 3000 <5 0 <50 <5 0 280 <2000 <50 <50 <50 41 50 nm clear 09/14100 46000 440 560 1600 3000 1000 <5 0 <50 <50 76 <600 <50 <5 0 <5 0 4781 nm clearisheen 12112/00 17000 940 420 450 1600 5200 na na na na na na na na 4416 nm dear 03/19/01 4100 650 16 180 94 2900 na na na na na na na na 4138 nm clear 06/19101 24000 2800 870 770 1800 7300 na na na na na na na na 4386 nm clear 09/27101 51000 1400 3900 1800 6800 1400 na na na na na na na na 5001 nm clear 12/13101 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 06119102 36000 2600 2000 1200 4600 5100 na na na na na na na na 4489 2560 clear 09/16/02 57000 2400 5000 1600 6300 2800 <10 <10 <10 150 <2500 <100 <10 <10 5020 3091 dear 12/26102 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 06/27/03 30000 1900 1700 1000 4200 4700 <20 <20 <20 <200 <2000 <200 <20 na 4687 -2758 dear f� 64fgmr Project No 1641 46 Page 8 of 9 HORIZON$PVQtONEt<HNTAL AaC