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TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No 3641 1210 E Hammer Lane,Stockton,California Depth to TOC GW Well TPHg benzene toluene ethyfbenzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol EDC ED8 GW Elevation Elevation Number Date (".III u n NO) (ug/1) u n u n u A u8.__ u (ug/1) u n (ug") NO) NO) feet feet msl —feet—MS-11—ag—MS-11 Comments VW 2 03/25/99 ns AS ns ns as ns ns ns ns ns ns ns ns ns nm nm nm dry screened 06102/99 AS ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry interval 08/31/99 as ns ns ns ns ns ns ns ns ns ns Its 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 03101/00 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 its 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 12112100 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 not nm dry 06119101 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 09127!01 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 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 Its dry nm dry 09/16/02 ns ns ns ns Its ns ns ns ns ns ns ns ns as dry nm dry VW 3 03/25/99 33000 1600 8100 1800 5400 660 -50 <5 0 <5 0 140 <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 <5 0 <0 50 <0 50 4245 nm slight odor 1 no 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 <5 0 <5 0 <5 0 100 <500 <50 <5 0 <5 0 4560 nm no comment 03/01100 12000 500 440 680 980 5000 <20 <20 <20 <200 <2000 <200 na na 4294 nm no comment 06/06/00 5900 1400 170 340 260 5600 <2 0 <2 0 39 260 <2000 <20 <20 <2 0 4200 rum Gear 09/14100 2600 760 52 85 120 2400 <2 0 <2 0 <20 110 <250 <20 <2 0 <2 0 4828 nm dear 12/12/00 3700 220 180 140 280 5500 na na na na na na na na 4463 nm dear 03/119/01 2600 110 72 150 160 2700 na na na na na na na na 4181 nm clear 06119/01 11000 2900 450 280 860 6700 na na na na na na na na 4450 nm dear og127101 860 78 10 12 26 1700 na na na na na na na na 5045 nm dear 12113/01 1300 280 21 33 62 2400 na na na na na na na na 4699 nm clear 03/28102 2900 91 52 150 170 2200 na na na na na na na na 4363 2006 2357 dear 06/19/02 10000 2300 280 350 1100 5400 na na na na na na na na 4546 2540 dear 09116/02 1400 170 34 52 74 1900 <5 0 <5 0 -50 62 <500 <50 <5 0 <50 5066 3060 dear I 641gmr01 AS 1641 22 Page 5 of 7 HORIZON ENVIRONMENTAL INC