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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 ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date (u/L (u/L u !L u /L u IL (u/L (u/L (u/L (ug/L (ug/L (ug/L (ug/L (ug/L (ug/L feet feet msl feet msl Comments MW-5 03/31/98 450 <0.50 40.50 40.50 40.50 <5.0 na na na na na na 61.11 25.11 -36.00 screened 06/10/98 <50 40.50 <0.50 <0.50 <0.50 <5.0 na na na na na na 58.41 -33.30 no odor I no sheen Interval 09/08/98 450 <0.50 <0.50 <0.60 <0.50 40.50 <0.50 <0.50 <0.50 <5.0 <50 45.0 58.41 -33.30 no odor/no sheen 65'-86.5' 12/30/98 450 <0.50 2.5 0.89 5.8 45.0 na na na na na na 56.51 -31.40 no odor/no sheen 03/25/99 450 40.50 <0.50 40.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 450 45.0 54.54 -29.43 no comment 06/03/99 450 <0.50 40.50 <0.50 <0.50 40.50 <0.50 40.50 <0.50 45.0 450 <5.0 <0.50 40.50 53.89 -28.78 no comment 08130/99 95 1.7 7.4 2.1 15 <0.50 <0.50 <0.50 <0.50 45.0 450 <5.0 40.50 <0.50 56.04 -30.93 no comment 12110/99 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 45.0 <50 <5.0 <0.50 <0.50 55.99 -30.88 no comment 03/03/00 450 <0.50 0.51 40.50 0.92 <0.50 <0.50 <0.50 40.50 <5.0 450 6.0 40.50 <0.50 54.53 -29.42 no odor/no sheen / 06/22/00 450 <0.50 <0.50 40.50 40.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 24 <0.50 <0.50 53.75 -28.64 no odor/no sheen a{` 09/28/00 <50 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na na na 56.19 -31.08 no odor/no sheen 12/21/00 <50 40.50 <0.50 <0.50 <0.50 <5.0 na na na na na na na na 55.32 -30.21 no odor/no sheen 03/28/01 78 2.5 14 2.1 11 45.0 na na na na na na na na 54.44 -29.33 no odor/no sheen 06/27/01 <50 <0.50 0.68 <0.50 <0.50 <0.50 40.50 <0.50 40.50 <5.0 <50 <5.0 40.50 <0.50 55.89 -30.78 no odor/no sheen 09/06/01 <50 0.64 1.1 0.70 2.0 <5.0 na na na na na na na na 57.96 -32.85 no odor/no sheen 12/03/01 <50 <0.50 1.1 40.50 40.50 <5.0 na na na na na na na na 58.45 -33.34 no odor/no sheen 02/28/02 450 <0.50 0.55 <0.50 <0.50 <5.0 na na na na na na na na 57.31 -32.20 no odor/no sheen 05/20/02 220 11 14 6.4 31 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 57.53 27.10 -30.43 no odor/no sheen MW-6 03/31/98 78000 23000 8500 1100 6300 <500 na na na na na na 61.43 25.44 -35.99 reported as MW-2A screened 06/10/98 120000 23000 17000 1600 15000 <500 na na na na na na 58.69 -33.25 reported as MW-2A Interval 09/08/98 120000 30000 20000 2300 18000 <0.50 <0.50 <0.50 <0.50 <5.0 <50 45.0 58.77 -33.33 odor/no sheen 56'-76' 12/30/98 71000 20000 6500 1900 11000 <250 na na na na na na 56.85 -31.41 slight odor/no sheen 03/25/99 48000 15000 1800 910 5100 40.50 <0.50 40.50 <0.50 20 <50 56 54.66 -29.42 no comment 06/03/99 33000 9600 2500 1100 5400 <5.0 <5.0 <5.0 45.0 <50 <500 <50 <5.0 10 54.14 -28.70 no comment 08/30/99 51000 7200 5400 2400 11000 42 <20 <20 <20 4200 <2000 4200 32 56 56.32 -30.88 no comment 12/10/99 67000 13000 2400 1800 9500 <20 420 <20 <20 4200 <50 <200 68 46 56.29 -30.85 no comment 03/03/00 28000 6000 280 570 3600 <20 <20 <20 420 4200 450 <200 <20 <20 54.89 -29.45 no odor/no sheen 06/22/00 26000 6500 570 710 2900 410 <10 <10 <10 <100 41000 <100 <10 <10 54.11 -28.67 slight odor/no sheen 09/28/00 30000 920 5300 830 6900 <5.0 na na na nana na na na 56.47 -31.03 slight odor/no sheen 12/22/00 55000 9600 950 1600 8300 <200 na na na na na na na na 55.72 -30.28 odor/no sheen 03/28/01 92000 15000 6600. 2800 13000 <50 na na na na na na na na 54.68 -29.24 odor/no sheen 06/27/01 86000 15000 8900 2600 12000 450 <50 <50 <50 <500 <5000 <1000 94 130 56.17 -30.73 odor no sheen 09/06/01 95000 17000 11000 2600 12000 <500 na na na na na na na na 58.20 -32.76 odor/no sheen 12/04/01 74000 14000 4600 2300 10000 <500 na na na na na na na na 58.81 -33.37 odor/no sheen 03/01/02 90000 13000 8300 2700 12000 <500 na na na na na na na na 57.61 -32.17 odor/no sheen 05/20/02 81000 14000 6200 2100 10000 4100 <100 4100 <100 <1000 <10000 <1000 <100 4100 57.85 27.39 -30.46 odor no sheen MW-7 03/31/98 <50 40.50 <0.50 <0.50 <0.50 45.0 na na na na na na 61.75 25.66 -36.09 screened 06/10/98 <50 40.50 40.50 40.50 <0.50 <5.0 na na na na na na 59.04 -33.38 no odorno sheen Interval 09/08198 450 40.50 <0.50 <0.50 <0.50 40.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 59.19 -33.53 no odor/no sheen 56'-76' 12/30/98 450 <0.50 <0.50 <0.50 <0.50 45.0 na na na na na na 57.18 -31.52 no odor/no sheen 03/25/99 <50 <0.50 40.50 <0.50 <0.50 <0,50 40.50 <0.50 <0.50 <5.0 <50 <5.0 55.07 -29.41 no comment 06/03/99 450 40.50 <0.50 40.50 <0.50 40.50 40.50 <0.50 40.50 <5.0 <50 <5.0 5.6 40.50 54.61 -28.95 no comment 08/30/99 450 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 40.50 <0.50 <5.0 <50 45.0 2.1 <0.50 56.85 -31.19 no comment 12/10/99 450 <0.50 <0.50 <0.50 <0.50 0.50 40.50 40.50 40.50 <5.0 450 <5.0 4.7 <0.50 56.68 -31.02 no comment 03/03/00 <50 <0.50 <0.50 <0.50 <0.50 0.62 <0.50 <0.50 <0.50 <5.0 <50 <5.0 5.0 <0.50 55.61 -29.95 no odor/no sheen 06126/00 <50 <0.50 <0.50 <0.50 40.50 <0.50 <0.50 40.50 40.50 <5.0 <50 9.4 4.0 <0.50 54.62 -28.96 no odor/no sheen 09/28/00 <50 40.50 <0.50 <0.50 40.50 <5.0 na na na na na na na na 56.93 -31.27 no odor/no sheen 10/20/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm 24.73 nm wellhead re-surveyed 12/22/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm no odor/no sheen 03/28/01 73 6.2 17 1.5 7.5 45.0 ns ns ns ns ns ns ns ns 54.73 -30.00 no odor/no sheen 06127/01 <50 40.50 1.0 <0.50 40.50 0.87 <0.50 <0.50 <0.50 <5.0 450 45.0 6.0 <0.50 55.99 -31.26 no odor/no sheen 09/06/01 <50 40.50 40.50 40.50 <0.50 45.0 na na na na na na na na 58.03 -33.30 no odor/no sheen 12/03/01 <50 <0.50 40.50 <0.50 40.50 <5.0 na na na na na na na na 58.41 -33.68 no odor/no sheen 02/28/02 450 <0.50 <0.50 40.50 <0.50 <5.0 na na na na na na na na 57.13 -32.40 no odor/no sheen 05/20/02 51 <0.50 1.9 40.50 <0.50 0.92 <0.50 <0.50 <0.50 <5.0 <50 <5.0 15 <0.50 57.55 26.94 -30.61 no odor/no sheen 474q-00.is Proled No 1474 44 Page 3 of 7 HORIZON ENVIRONMENTAL INC.