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TABLE I 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 DCA EDB GW Elevation Elevation Number Date (ug/1) u A u 11 u A (ug/1) u A (ug/1) (u 11)( (u 11)( (ugh) u A (ug/1) (u 11)( (ug/1) feet feet msl feet msl Comments VW4 03/25/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm nm dry screened 06/02199 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry interval 08/31/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 25-40 12!09199 ns ns ns ns ns ns ns ns 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 06/06/00 ns ns ns 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 12/12/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 03/19101 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 06/19/01 ns ns ITS ns ns ns ns ns ns its 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 12/13/01 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 ns 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 n$ ns dry nm dry 12126102 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 03/26103 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 5 03/25/99 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 08131/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 4773 nm 0 05 ft FP!sheen 40'-50' 12/09/99 100000 13000 10000 570 16000 31000 <20 <20 <20 <200 <2000 <200 <20 <20 4570 nm no comment 03/01/00 27000 5100 520 1500 770 14000 <50 <50 <50 <500 <5000 <500 na na 4247 nm no comment 06/06/00 43000 7700 4600 1300 3700 16000 <10 <10 <10 750 <2500 <100 <10 <10 41 84 nm Gear 09/14100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 4803 nm considered dry 12/12100 16000 1000 1100 480 1800 24000 na na na na na na na na 4401 nm clear 03/19101 29000 3300 4400 740 3000 20000 na na na na na na na na 4138 nm clear 06/19101 120000 16000 13000 2300 11000 41000 na na na na na na na na 4471 nm clear 09/27/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 12113101 23000 2000 510 180 790 26000 ns ns ns ns ns ns ns ns 4651 nm sheen 03/28/02 10000 760 580 89 330 14000 ns ns ns ns ns ns ns ns 4309 1939 -2370 no comment 06/19/02 21000 3900 2300 190 750 20000 na na na na na na na na 4542 -2603 no comment 09116/02 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 4886 -2947 no comment 12126/02 58000 5500 4200 1000 4500 35000 na na na na na na na na 4741 -28 02 clear 03/26/03 68000 7500 8200 1300 6400 34000 na na na na na na na na 4511 -2572 clear 06!27103 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 4745 2806 considered dry 641gmr Project Na 1641 46 Page 7 of 9 HORIZON ENVIRONNOMAL INC