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TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No.12474 3440 East Main Street,Stockton,California ethyl- total Depth to TOC GW Well TPH9 benzene toluene benzene xylenes MTBE DIPE ETRE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date (uglL) (uglL) (ug1L) (ug/L) (ug1L) (uglL) (uglL) (ug1L) (uglL) (uglL) (ug1L) (uglL) (uglL) ug1L (feet) (feet msi) (feet msl) Comments MW-11 10!26199 1600 3.6 0.93 23 1.7 3.1 10.50 10.50 10,50 15.0 150 15.0 24 10,50 57.72 25.14 31.58 no ododno sheen screened 03!03100 300 0.8 10.50 10.50 10.50 1.9 <0,50 10.50 10.50 150 10.50 15.0 4.9 10.50 55.64 -29.50 no odor/no sheen interval 0622100 ns ns ns ns ns ns ns ns ns AS ns ns ns ns nm nm obstruction at 44' 50'•70- 09!28!00 2000 3.8 0.50 29 0.78 15.0 no no no no na no no no 57.21 -31.07 no odorino sheen 12/22/00 1100 2.2 <0-50 2.2 0,65 15.0 na na na na na na no na 56,41 -30,27 no ododno sheen 03128MI 1200 0.98 <0.50 86 0.62 15.0 na no no no no na na no 55.66 24.52 sfighl odod no sheen 06/27/01 1500 1.3 10,50 12 <0.50 <0,50 10.50 <0.50 <0.50 15.0 150 <5 0 67 10,50 56.92 30.78 slight odor!no sheen 09/06101 950 2.6 1,8 8.7 3.9 15.0 na na na na na na na na 58.98 .32.84 no ododno sheen 12/04101 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry dry dry 03101102 770 1A 1.4 0.55 2.3 15.0 no no no no no na no na 5829 -32.15 no odor/no sheen MW-12 10126/99 81000 3200 17000 3100 17000 12.0 12.0 12.0 <2.0 120 150 46000 <50 66 53.51 25.79 •27.72 -n0-.d---1n.-.h--n7 screened 03!03100 70000 2800 13000 2000 11000 59 <50 <50 150 1500 10.50 36000 1200 150 55.63 -29.84 no odor/lo sheen interval 06122/00 87000 2600 14000 2400 13000 120 120 <20 <2U <200 <20W 39000 30 <20 54.64 -26.85 no odor/no sheen "4'-891 09128= 68" 7500 33W 2200 7700 1200 no no no no no na no no 56,49 -30.70 slight odorhld sheen 12122100 27000 750 4700 190 5500 <200 na na no na no na no no 56,32 -30,53 odor Ino sheen 03J2W1 67000 2400 11000 2100 12000 1200 no no na na na na na na 55.20 -2941 odor Inosheen 06/27101 93000 58W 15000 2900 16000 <50 150 150 <50 1500 15000 60000 240 <50 56.45 -30.66 odor Inosheen 09106!01 80000 7100 9500 2400 13000 1250 no no no no no na no no 58.30 -32.51 odor I no sheen 12/04/01 81000 6000 6200 2500 11000 1100 no no na na na na na no 59.16 •33-37 odor/no sheen 03101102 69000 5900 5500 2000 9500 <250 na no na no no no na na 58,03 -3224 odor l no sheen AS-11 10!26199 1700 100 7.7 26 27 5.0 <0,50 10,50 <0.50 <5.0 150 200000 5.6 <0,50 60.94 nm nm no odorino sheen screened 03103/00 <200 8.0 <2.0 3.2 12.0 11 12,0 12.0 12.0 120 10.50 69000 12.0 <2.0 55.51 nm no odor/no sheen interval 06f22100 <200 8.3 2.8 3.2 4.2 10 <2.0 <2.0 <2-0 <20 <200 55000 <2.0 Q.0 54.84 nm no odorino sheen 70.5-75.5' 09/28100 200 5.3 1.2 1.9 2.1 10 no no no na no no no -;1a 56,63 nm no odorino sheen 12!22100 96 2.0 1.1 10.50 0.62 32 na na no na no na na no 56.51 nm no odortno sheen 03/28101 1200 70 220 28 120 <10 no no no no no no no no 56.02 nm na odorino sheen 06127!01 600 21 43 3,4 3.9 7,7 10.50 10.50 10.50 7.6 150 13000 1.4 10.50 56.80 nm no odorino f19f06t01 610 19 35 14 32 6.8 no no na na no no no no 58.81 nm no odofhso sheen 12104101 4900 540 350 170 880 <25 ne na na na na na na na 59.27 nm no odortno sheen 03161102 690 55 33 14 77 5.1 na na no no no na na no 58.55 nm no odorino sheen 4744-00..!. PM).0 Nc.1474.44 Page 5 of 7 HORIZON SNVIROIO[EIf7'AL INC.