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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 TPHg benzene toluene benzene xylenes MTBE DIPE ETRE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date (ug/L (ug/L (ug/L (ug/L (ug/L (ug/L (ug/L (ug/L u 1L (ug/L (ug/L (ug/L).( (ug/L u 1L feet feet msl feet msl Comments MW-12 10126199 81000 3200 17000 3100 17000 <2.0 <2.0 <2.0 <2,0 -20 '50 46000 <50 66 53.51 25.79 -27.72 no cdorino sheen screened 03103100 70000 2800 13000 2000 11000 59 <50 -50 <50 <500 -0.50 36000 <200 <50 55.63 -2984 no odorino sheen Interval 05!22100 87000 2600 14000 2400 13000 <20 <20 -20 <20 <200 <2000 39000 30 <20 54.64 -28.85 no odor/no sheen 84'-89' 09!28100 68000 7500 3300 2200 7700 -200 na na na na na na na na 56.49 -30.70 slight odorino sheen 12122!00 27000 750 4700 190 5500 <200 na na na na na na na na 56.32 -30.53 odor!no sheen 03/26/01 67000 2400 11000 2100 12000 400 na na na na na na na na 55.20 -29.41 odor I no sheen 06/27101 93000 5800 15000 2900 16000 <50 <50 <50 <50 <500 <5000 60000 240 <50 56.45 -30.66 odor lno sheen 09106/01 80000 7100 9500 2400 13000 <250 na na na na na na na na 58.30 -32.51 odor lno sheen 12/04101 81000 6000 6200 2500 11000 -300 na na na na na na na na 59.16 -33.37 odor!no sheen 03101102 69000 5900 5500 20DO 9500 -250 na na na na na na na na 58.03 -32.24 odor lno sheen 05120102 43000 4700 3700 830 5700 <25 <25 <25 -25 <250 4500 41,000 440 <25 58.29 27.75 -30.54 odor l no sheen 08/30102 38000 4700 3300 860 4500 <200 na na na na na na na na 61.03 -33.28 odor lno sheen 12106102 27000 3400 2600 220 4300 <20 na na na na na na na na 61.51 -33.76 odor lno sheen A8-1 10!26199 1700 100 7,7 26 27 5.0 10.50 -0.50 <0.50 <5,0 '50 200000 5,6 <0.50 60.94 nm nm no odor/no sheen screened 03/03/00 <200 8.0 <2.0 3.2 <2.0 11 <2.0 <2.0 4.0 <20 -0.50 69000 <2.0 <2.0 55.51 nm no odor/no sheen interval 06122!00 400 8.3 2.8 3.2 4.2 10 <2.0 <2.0 -2.0 <20 400 55000 <2.0 <2.0 54.84 nm no odor/no sheen 70.5-75.5' 09/28/00 200 5.3 1.2 1.9 2.1 10 na na na na na na na na 56.63 nm no odor/no sheen 12122!00 96 2.0 1.1 <0.50 0.62 32 na na na na na na na na 56.51 nm no odor/no sheen 03/28/01 1200 70 220 28 120 <10 na na na na na na na na 56,02 nm no odor/no sheen 06127!01 600 21 43 3.4 3.9 7.7 <0.50 <0,50 <0,50 7.6 '50 13000 1.4 <0.50 56.80 nm no odorino sheen 09106/01 610 19 35 14 32 6.8 na na na na na na na na 58.81 nm no odor/no sheen 12104/01 4900 540 350 170 880 <25 na na na na na na na na 59.27 nm no odor/no sheen 03101102 690 55 33 14 77 5.1 na na na na na na ria na 58.55 nm no odor/no sheen 05120!02 2000 140 150 43 170 5.0 <0.50 -0.50 -0.50 <5,0 <2500 12,000 1.3 <0.50 58.39 27.93 -30.46 no odor/na sheen 08!30102 550 21 16 6.5 19 8.0 na na na na na na na na 61.45 -33.52 no odor/no sheen 12!06102 9800 2000 1300 290 1700 <10 na na na na na na na na 61.35 -33.42 odorino sheen VW-1 09/08198 170000 36000 47000 3300 24000 0.70 <0.50 <0.50 <0.50 <5.0 61 6.8 na na 58,88 nm nm strong odor/no sheen screened 12/30198 190000 34000 49000 3300 24000 <1000 na na na rna na na na na 57.10 nm odor lno sheen Interval 03125199 260000 37000 55000 4800 32000 <5.0 <5,0 <5.0 <5.0 <50 <500 <50 na na 55.05 nm no comment 50'-65' 06/03/99 120000 20000 26000 3500 23000 <5.0 -5.0 <5.0 <5.0 <50 '500 <50 140 520 54.19 nm no comment 08130199 130000 25000 46000 3900 25000 <50 <50 <50 <50 <600 -5000 <500 160 620 56.28 nm no comment 12110!99 200000 22000 35000 3300 23000 -100 <100 <100 <100 -1000 <10,000 -2000 160 590 56.42 nm no comment 03/03/00 180000 23000 36000 2500 18000 <100 -100 -100 <100 '1000 <20,000 -1000 1500 5800 55.63 nm no odor/no sheen 06!22100 1900DO 23000 39000 3200 22000 <100 <100 -100 <100 <1000 <10,000 <1000 130 540 54.16 nm no odorino sheen 09128100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm 12122100 190000 29000 42000 2900 20000 <2000 na na na na na na na na 55.82 nm odor lno sheen 03128!01 160000 36000 40000 4900 20000 <500 na na na na na na na na 54.93 nm odor lno sheen 06127101 190000 28000 40000 3900 24000 -200 <200 -200 <200 4000 40000 14000 290 730 56.43 nm odor l no sheen 09/06101 230000 36000 43000 3300 20000 <2000 na na na na na na na na 58.60 nm odor 1 no sheen 12/04101 200000 32000 41000 3500 23000 <t000 na na na na na na na na 58.91 nm no odorino sheen 03/01/02 230000 29000 37000 3700 24000 <2000 na na na na na na na na 57.74 nm slight odor! sheen 05120/02 220000 32000 41000 3600 23000 <200 400 400 <200 <2000 <20000 <2000 <200 <200 57.86 27.51 -30.35 no odor/no sheen 08130/02 200000 31000 31000 2600 17000 <1000 na na na na na na na na 60.90 -33.39 odor/slight sheen 12106/02 170000 31000 33000 2800 18000 <25 na na na na na na na na 61.23 -33.72 odor lno sheen 474gmr0a x1s Project No.1474.44 Page 6 of 8 HORIZON ENVIRONMENTAL INC.