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TABLE I GROUNDWATER MONITORING DATA Beacon Station No 3641 1210 E Ilammer Lane,Stockton,California Depth to TOC GW Well TPHg benzene toluene ethylbenzene xylenes MTBE DIPE ETBE TAME TBA methanol etn.1111-1 EDC EDB GW Elevation Elevation Number F Date (ugh) (ug/1) (ugl1) (ugll) (ug/1) (ug/1) (ug") fugA) (ug/1) (ug1l) (ugll) (ug/1) (ugll) (ug11) (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 12/09/99 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 06/06/00 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 n$ 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 ns ns ns ns ns ns its ns ns ns ns ns dry nm dry 09/27101 ns ns ns ns ns ns ns ns ns ns ns ns ns _-ns dry nm dry 12/13101 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 03128102 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 06/19102 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 12/26/02 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 03/26/03 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 <5 0 na na 4207 nm nm slight odor!no sheen screened 06/02/99 13000 6000 180 1400 300 4000 <0 50 <0 50 26 85 <200 <50 <0 50 <0 50 4245 nm slight odor 1 no sheen Interval 08/31199 11000 860 230 470 140 6900 <10 <10 <10 300 <1500 <100 <10 <10 4766 nm no comment 45 55 12/09/99 11000 1200 550 560 430 6200 <5 0 <5 0 <50 100 <500 <50 <5 0 <50 4560 nm no comment 03101/00 12000 500 440 680 980 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 Z 0 <20 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 12112/00 3700 220 180 140 280 5500 na na na na na na na na 4463 nm clear 03/19/01 2600 110 72 150 160 2700 na na na na na na na na 41 81 nm dear 06119/01 11000 2900 450 280 860 6700 na na na na na na na na 4450 nm dear 09/27/01 860 78 10 12 26 1700 ne na na na na na na na 5045 nm clear 12/13/01 1300 280 21 33 62 2400 na na na na na na na na 4699 nm Gear 03128/02 2900 91 52 150 170 2200 na na na na na na na ria 4363 2006 2357 dear 06/19/02 10000 2300 280 350 1100 5400 na na na na na na na na 4546 2540 clear 09!16102 1400 170 34 52 74 1900 <50 <5 0 <50 62 <500 <50 <50 <50 5066 3060 clear 12/26102 1100 75 16 41 60 1600 na na na na na na na na 4795 2789 dear 03/26103 2100 150 15 64 150 1900 na na na na na na na na 4555 2549 clear I 1 641gmr Kts Protect No 1641 46 Page 6 of 9 HORIZON ENVIRONMENTAL INC