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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 TPHg benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation u NW u /L u /L u /L u /L (unit u IL u /L u /L u IL u IL u /L u /L feet feet msl feet msl Comments MW-11 10/26/99 1600 3.6 0.93 23 1.7 3.1 -0.50 -0.50 -0.50 <5.0 <50 <5.0 24 -0.50 57.72 26.14 -31.58 no odor/no sheen screened 03/03/00 300 0.8 -0.50 <0.50 <0.50 .1.9 <0.50 <0.50 <0.50 <5.0 <0.50 <5.0 4.9 -0.50 55.64 -29.50 no odor/no sheen Interval 06/22/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm obstruction at 44' 50'-70' 09/28/00 2000 3.8 0.50 29 0.78 <5.0 na na na na na na na na 57.21 -31.07 no odor/no sheen 12/22/00 1100 2.2 -0.50 2.2 0.65 <5.0 na na na na na na na na 56.41 -30.27 no odor/no sheen 03/28/01 1200 0.98 <O.50 8.6 0.62 <5.0 na na na na na na na na 55.66 -29.52 slight odor/no sheen 0627/01 1500 13 <0.50 12 -0.50 <O.50 -0.50 <0.50 <0.50 <5.0 c50 <5.0 67 <0.50 56.92 -30.78 slight odor/no sheen 09/06/01 950 2.6 1.8 8.7 3.9 <5.0 na na na na na na na na 58.98 -32.84 no odor/no sheen 12/04/01 ns. ns ns ns ns ns ns ns ns ns ns ns ns ns dry dry dry 03/01/02 770 1.1 1.4 0.55 2.3 <5.0 na he na na na na na na 58.29 -32.15 no odor/no sheen .1( 05/20/02 1400 -0.50 <O.SO 1.5 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 59 -0.50 58.57 28.10 -30.47 no odor/no sheen MW-12 1026/99 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 odor/no sheen screened 03103/00 70000 2800 13000 2000 11000 59 <50 <50 <50 <500 <0.50 36000 <200 <50 55.63 -29.84 no odor/no sheen Interval 06/22/00 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 na56.49 -30.70 slight odor/no sheen 12/22/00 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 <200 na na na na na na na na 55.20 49.41 odor/no sheen 06/27/01 93000 5800 15000 2900 16000 <50 <50 <50 <50 -500 <5000 60000 240 <50 56.45 -30.66 odor/no sheen 09/06/01 80000 7100 9500 2400 13000 <250 na na na na na na na na 58.30 -32.51 odor/no sheen 12/04/01 81000 6000 6200 2500 11000 <100 na na na na na na na na 59.16 -33.37 odor/no sheen 03/01/02 69000 5900 5500 2000 9500 <250 na na na na na na na na 58.03 -32.24 odor/no sheen 0520/02 43000 4700 3700 830 5700 <25 <25 <25 <25 <250 <2500 41,000 440 <25 58.29 27.75 -30.54 odor/no sheen AS-1 10/26/99 1700 100 7.7 26 27 5.0 <0.50 -0.50 -0.50- <5.0 <50 200000 5.6 -0.50 60.94 nm nm no ododno sheen screened 03/03/00 <200 8.0 <2.0 3.2 <2,0 11 <2.0 <2.0 <2.0 . <20 <0.50 69000 <2R <2.0 55.51 nm no odor/no sheen Interval 06/22/00 <200 8.3 2.8 3.2 4.2 10 <2.0 <2.0 <2.0 <20 <200 55000 <2.0 ,<2.0 54.64 rim 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 12/22/00 96 2.0 1.1 <0.50 0.62 32 na na na na na na na na %51 nm no odor/no sheen 0328/01 1200 70 220 28 120 <10 na na na na na na na na 56.02 nm no ododno sheen 06/27/01 600 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 odor/no sheen 09/06/01 610 19 - 35 14 32 6.8 na na na na na na na na 58.81 nm no odor/no sheen 12/04/01 4900 540- 350 170 880 <25 na na na na na na na na 59.27 nm no odor/no sheen 03/01/02' 690 55 33 14 77 5.1 na na na na na na na na 58.55 nm no odor/no sheen 0520/02 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/no sheen 474gmre0.xls Project No.1474.44 Page 5 of 7 HORIZON ENVIRONMENTAL.INC.