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TABLE 2 GROUNDWATER MONITORING DATA Beacon Station No 3641 1210 E Hammer Lane,Stockton,California I Depth to TOC GW Well TPHg benzene toluene ethylbenzene xylenes MTBE DIPS ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date NO) (U011u A u A u A (u11)( u A (ug/1) u A (ug/l u A u A u A u A feet feet msi feet ms! 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 03/01/00 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 09/14/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 1211111 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 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 12/13/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 03128/02 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 VW-3 03/25/99 33000 1600 8100 1800 5400 660 <5 0 <5 0 <5 0 140 <50 <50 na na 4207 nm nm slight odor/n0 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 I n0 sheen interval 08/31/99 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 <50 <5 0 <5 0 100 <500 <50 <5 0 <5 0 4560 nm no comment 03/01/00 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 <2 0 <2 0 4200 nm Gear 09114/00 2600 760 52 85 120 2400 <2 0 <2 0 <2 0 110 <250 <20 <2 0 <2 0 4826 nm Gear 12/12/00 3700 220 180 140 280 5500 na na na na na na na na 4463 nm dear 03/19101 2600 110 72 150 160 2700 na na na na na na na na 4181 nm dear 06/19/01 11000 2900 450 280 860 6700 na na na na na na na na 4450 nm Gear 09127/01 860 78 i0 12 26 1700 na 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 dear 03/28102 2900 91 52 150 170 2200 na na na na na na na na 4363 2006 2357 clear 06119/02 10000 2300 280 350 1100 5400 na na na na na na na na 4546 2540 dear 641gmr01 As Prated 140 1641 15 Page 5 of 7 HORIZON ENVIRONMZNTAL INC