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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 RIPE ETBE TAME TBA methanol ethanol DCA EDS GW Elevation Elevation Number Date NO) u A ell u ll (ug/1) u fl u 11 11 u 11 u 11 u 11 a 4 u 11 (ugm) feet feet msl feet msl Comments VW-2 03/25/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm nm dry screened 06/02/99 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 21-36' 12109/99 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 06106/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 09/14/00 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 03/19/01 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 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 I� 06119/02 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 12126/02 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 03/25103 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 3 03/25/99 33000 1600 8100 1800 5400 660 <5 0 <5 0 <50 140 <50 <50 na na 4207 nm nm slight odor 1 no sheen screened 06/02199 13000 6000 180 1400 300 4000 <0 50 <0 50 26 85 <200 <5 0 <0 50 <0 50 4245 nm slight odor 1 no sheen interval 08/31/99 11000 660 230 470 140 6900 <10 <10 <10 300 <1500 <100 <10 <10 4766 nm no comment 45-55' 12JO9199 11000 1200 550 560 430 6200 <50 <50 <5 0 100 <500 <50 <5 0 <50 4560 nm no comment 03/01/00 12000 500 440 660 960 5000 <20 <20 <20 <200 <2000 <200 na na 4294 nm no comment 06106/00 5900 1400 170 340 260 5600 <2 0 <2 0 39 260 <2000 <20 <2 0 <2 0 4200 nm clear 09/14/00 2600 760 52 85 120 2400 <2 0 <2 0 <2 0 110 <250 <20 <2 0 <2 0 4828 nm clear 12/12100 3700 220 160 140 280 5500 na na na na na na na na 4463 nm clear 03119/01 2600 110 72 150 160 2700 na na na na na na na na 4181 nm Gear 06119/01 11000 2900 450 280 860 6700 na na na na na na na na 4450 nm clear 09/27/01 860 78 10 12 26 1700 na na na na na na na na 5045 nm clear 12/13101 1300 280 21 33 62 2400 na na na na na na na na 4699 nm clear 03/28/02 2900 91 52 150 170 2200 na na na na na na na na 4363 2006 2357 clear 06/19102 10000 2300 280 350 1100 5400 na na na na na na na na 4546 -2540 clear 09/16/02 1400 170 34 52 74 1900 <5 0 <5 0 <50 62 <500 <50 <50 <5 0 5066 -3060 Gear 12/26/02 1100 75 16 41 60 1600 na na na na na na na na 4795 2789 Gear 03/26/03 2100 150 15 64 150 1900 na na na na na na na na 4555 2549 Gear 06/27/03 6200 1600 100 130 390 6500 <10 <10 <10 <100 <1000 <100 <10 na 4741 2735 Gear 641gmr PMect No 1641 46 Page 6 of 9 HORIZON ENVIRONMENTAL INC