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• r. r 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 DIPS ETRE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date (ug1L) (ug/L) (ug/L) (ug/L) (ug/L) I(ug/L)l(ug/L) (uglL) (ug/L) (ug1L) (uglL) (uglL) (uglL) uglL (feet) (feet msl) (feet mail) Comments MW-4 03/31/98 ns ns ns ns ns ns ns ns ns ns ns ns nm 25.15 nm not located screened 06/10/98 ns• ns ns ns ns ns ns ns ns ns ns ns nm nm not located Interval 09108/98 ns ns ns ns ns ns ns ns ns ns ns ns nm nm not located 65'-86' 121$0198 ns ns ns ns ns ns ns ns ns ns ns ns nm nm paved over 03/25/99 ns ns ns nsns ns ns ns ns ns ns ns ns ns nm nm paved over 08/30/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm paved over 12/10/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm paved over 03/03/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm paved over 06122/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm paved over 09/28/00 <50 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na na na 56.16 -31.01 no ododno sheen 12121100 <50 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na na na 55.28 -30.13 no odor/no sheen 03/28/01 <50 1.1 5.8 0.93 4.5 <5.0 na na na na na na na na 54.41 -29.28 no odortno sheen 06/27/01 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 55.90 -30.75 no odor/no sheen MW-5 03!31198 <50 <0.50 <0.50 <0.50 <0.50 <5.0 1 na na na na na na 61.11 25.11 -36.00 screened 06/10/98 <50 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na 58.41 .33.30 no odor 1 no sheen Interval 09/08/98 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 58.41 -33.30 no odor 1 no sheen 65'-86.5' 12/30/98 <50 <0.50 2.5 0.89 5.8 <5.0 na na na na na na 56.51 -31.40 no odor lno sheen 03!25199 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 54.54 -29.43 no comment 06/03/99 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 53.89 -28.78 no comment 08!30199 95 1.7 7.4 2.1 15 <DM <0.50 <0.50 <0.50 <5.0 <50 <5.0 10.50 <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 <5.0 <50 <5.0 <0.50 <0.50 55.99 .30.88 no comment 03/03/00 <50 10.50 0.51 <0.50 0.92 10.50 <0.50 <0.50 <0.50 <5.0 <50 6.0 <0.50 <0.50 54.53 -29.42 no ododno sheen 06122/00 <50 10.50 <0.50 <0.50 <0.50 10.50 <0.50 <0.50 <0.50 <5.0 <50 24 <0.50 10.50 53.75 -28.64 no odortno sheen 09/26/00 <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 <0.50 <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 <5.0 na na na na na na na na 54.44 -29.33 no odortno sheen 06/27/01 <50 <0.50 0.68 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 55.89 -30.78 no odorino sheen MW-6 03/31/98 78,000 23,000 8500 1100 6300 <500 na na na na na na 61.43 25.44 -35.99 reported as MW-2A screened 06110/98 120,000 23;000 17,000 1600 15,000 <500 na na na na na na 58.69 -33.25 reported as MW-2A Interval 09108/98 120,000 30,000 20,000 2300 18,000 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 58.77 -33.33 odor I no sheen 56'-76' 12/30198 71,000 20,000 6500 1900 11,000 <250 na na na na na na 56.85 -31.41 slight odor 1 no sheen 03/25/99 48,000 15,000 1800 910 5100 <0.50 <0.50 <0.50 <0.50 20 <50 56 54.86 -29.42 no comment 06/03/99 33,000 9600 2500 1100 5400 15,0 <5.0 <5.0 <5.0 <50 <500 <50 <5.0 10 54.14 -28.70 no comment 08/30/99 51,000 7200 5400 2400 11,000 42 <20 <20 <20 <200 <2000 <200 32 56 56.32 -30.86 no comment 12/10/99 67,000 13,000 2400 1800 9500 <20 <20 <20 <20 <200 <50 <200 68 46 56.29 -30.85 no comment 03/03100 28,000 6000 260 570 3600 <20 120 <20 <20 1200 150 <200 <20 <20 54.69 -29.46 no ododno sheen 06122/00 26,000 6500 570 710 2900 <10 <10 <10 <10 <100 <1000 <100 <10 <10 54.11 -28.67 slight odor/no sheen 09MI00 30,000 920 5300 830 6900 <5.0 na na na na na na na na 56.47 -31.03 slight ododno sheen 12/22/00 55,000 9600 950 1600 8300 <200 na na na na na na na na 55.72 -30.28 odor I no sheen 03/28/01 92,000 15000 6600 2800 13000 <50 na na na na na na na na 54.68 -29.24 odor I no sheen 4 06127101 86,000 15000 8900 2600 12000 <50 <50 <50 <50 <500 <5000 <1000 94 130 56.17 -30.73 odor 1 no sheen r 474gmr00,xfs Proied No.1474.44 Page 2 of 6 HORIZON ENVIRONMENTAL INC.