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TABLE I GROUNDWATER MONITORING DATA Beacon Station No.3641 1210 E.Hammer Lane,Stockton,California Depth to TOC GW Well TPI-Ig benzene toluene ethylbenzene xylenes MTBE D1PE ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date (ug1l) (ug!!) (ug/1) (U911) (ug/1) (ug/1) (ug!{) (ugtI) u 1l) I (ug/1) (ug/1) (feet) (feet msl) feet msl) Comments VW-4 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 no ns ns ns ns ns ns ns nm nm dry Interval 08131M ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 25'-40' 12109/99 ns ns ns ns ns ns ns AS ns ns ns ns ns ns nm nm dry 03101100 ns ns ns ns ns ns ns ns ns ns ns ns AS ns nm nm dry 06106/00 ns ns ns ns ns no ns ns ns ns ns ns ns ns nm nm dry 09114/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 12112/00 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 no no its ns ns ns ns ns ns nm nm dry 06119101 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 09127/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 12113/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 03128/02 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 06/19/02 ns ns ns ns ns ns ns ns ns ns ns ns ns. n5 nm nm dry 09116/02 ns ns ns ns ns ns ns ns no ns ns ns ns ns nm nm dry 12126/02 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 03126/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 06/27/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 09/19/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 12130103 ns ns ns ns ns ns ns ns ns ns ns ns ns no nm nm dry 03!26104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 06117/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm 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 06102/99 ns ns ns ns ns ns n$ ns _ ns ns ns ns ns ns nm nm interval 08/31/99 ns ns ns ns no ns ns ns ns ns ns ns ns ns 47.73 nm 0.05 ft FP/sheen 40'-50' 12109!99 100000 13000 10000 570 16000 31000 <20 <20 <20 <200 <2000 <200 <20 <20 45.70 nm no Comment 03101100 27000 5100 520 1500 770 14000 <50 <50 <50 <500 <5000 <500 no no 42.47 nm no comment 06106/00 43000 7700 4600 1300 3700 16000 <10 <10 <10 750 <2500 <100 <10 <10 41.84 nm clear 09114/00 ns no ns no ns ns ns n$ ns ns ns ns ns ns 48.03 nm considered dry 12112100 16000 1000 1100 480 1800 24000 no na na na na no no na 44.01 nm clear 03119/01 29000 3300 4400 740 3000 20000 no no na no no na na na 41.38 nm clear 06119101 120000 16000 13000 2300 11000 41000 no no na na na na no no 44.71 nm clear 09127/01 ns ns ns ns no no ns ns ns ns ns ns ns ns nm nm dry 12113/01 23000 2000 510 180 790 26000 ns ns ns ns ns ns ns ns 46.51 nm sheen 03128/02 10000 760 580 89 330 14000 ns ns ns ns ns ns ns ns 43.09 19.39 -23.70 no comment 06119/02 21000 3900 2300 190 750 20000 no no no no no no no no 45.42 -26.03 no comment 09/16/02 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 48.86 -29.47 no comment 12/26/02 58000 5500 4200 1000 4500 35000 no na no no no no no na 47.41 -28.02 dear 03/26/03 68000 7500 8200 1300 8400 34000 na na no no no no no no 45.11 -25.72 Gear 06!27103 no ns ns ns ns ns ns ns ns ns ns ns ns ns 47.45 -28.06 considered dry 09/19103 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 12/30103 ns ns ns ns ns ns ns as ns ns ns ns ns ns nm nm dry 03!26104 48000 4900 3200 730 4700 25000 <50 <50 <50 1000J <5000 <500 <50 na47.34 -27.95 odor 06/17104 no ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 641 gmrbe Project Na.1641.47 Page 9 of 1 i HORIZON ENVIRONMENTAL afC.