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TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No.3641 1210 E.Hammer Lane, Stockton, California ethyl- Depth to TOC GW Well TPHg benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol DCA EDS GW Elevation Elevation(ug/1) (ug/1) u /l (ug/1) (ug/1) (ug/1) (ug/1) u11u /lu /j (ug/1) u 11 u /I feet feet msl feet msl Comments MW-4 10/2/97 35000 9300 600 1100 3600 1800 <5.0 <5.0 <5.0 <500 <50000 <10000 na na 57.45 100.00 42.55 no sheen,no odor screened 3/31198 2000 14 3.9 <0.50 7.5 <50 na na na na na na na na 49.72 50.28 no sheen,slight odor interval 6110198 2400 6 1.2 <0.50 1.1 12 na na na na na na na na 46.63 53.37 no sheen,slight odor 50'-75' 918198 660 2.9 1 4.8 <0.50 120 <0.50 <0.50 <0.50 11 230 <5.0 na na 49.87 50.13 no sheen,no odor 12/30/98 180 <0.50 0.88 <0.50 1.2 28 na na na na na na na na 44.56 55.44 no sheen,no odor 3125/99 80 <0.50 <0.50 <0.50 <0.50 8 <0.50 <0.50 <0.50 5.6 <50 <5.0 na na 41.94 58.06 no sheen,no odor 612199 160 <0.50 <0.50 <0.50 <0.50 41 <0.50 <0.50 <0.50 25 <50 <5.0 <0.50 <0.50 42.90 57.10 no sheen,no odor 8/31/99 460 8.6 <0.50 0.85 <0.50 540 <0.50 <0.50 <0.50 40 <50 <5.0 <0.50 <0.50 48.39 51.61 no comment 1219199 <50 <0.50 <0.50 <0.50 <0.50 440 <0,50 <0.50 <0.50 24 <50 <5.0 <0.50 <0.50 45.46 54.54 no comment 3/1100 100 <0.50 <0.50 <0.50 <0.50 110 <0.50 <0.50 <0.50 13 <500 <5.0 na na 42.98 57.02 no comment 6/6100 200 <0.50 <0.50 <0.50 <0.50 62 <0.50 <0.50 <0.50 33 <200 <5.0 <0.50 <0.50 42.53 57.47 clear 9114100 120 0.73 <0.50 <0.50 <0.50 1100 <0.50 <0.50 2.2 70 <700 <5.0 <0.50 <0.50 48.58 51.42 clear 12/12/00 <50 <0.50 <0.50 50.50 <0.50 420 na na na na na na na na 44.33 55.67 clear 3119101 <50 <0.50 <0.50 <0.50 <0.50 140 na na na na ria na na na 41.85 58.15 clear 6/19101 60 <0.50 <0.50 <0.50 <0.50 220 na na na na na na na na 45.65 54.35 clear 9127101 <100 <1.0 <1.0 <1.0 <1.0 350 na na na na na na na na 50.62 49.38 clear 12/13/01 52 <0.50 <0.50 <0.50 <0.50 320 na na na na na na na na 46.87 53.13 clear 3128/02 <50 <0.50 <0.50 <0.50 <0.50 56 na na na na na na na na 43.55 19.97 -23.58 clear 6119/02 81 <0.50 ' <0.50 <0.50 <0.50 84 na na na na na na na na 46.21 -26.24 clear 9116102 <100 <1.0 <1.0 <1.0 <1.0 260 <1.0 <1.0 <1.0 18 <100 <10 <1.0 <1.0 51.16 -31.19 clear 12/26/02 <50 <0.50 <0.50 <0.50 <0.50 65 na na na na na na na na 47.83 -27.86 clear 3/26/03 <50 <0.50 <0.50 <0.50 <0.50 27 na na na na na na na na 45.58 -25.61 clear 6127/03 <50 <0.50 <0.50 <0.50 <0.50 42 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 na 48.30 -28.33 clear 9119/03 150 3.2 <0.50 9.7 <0.50 390 na na na na na na na na 54.75 -34.78 clear 12/30/03 <50 <0.50 <0.50' <0.50 <0.50 96 na na na na na na na na 50.15 -30.18 clear 3126/04 <50 <0.50 <0.50 <0.50 <0.50 39 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 na 47.88 -27.91 clear 6117104 <50 <0.50 <0.50 <0.50 <0.50 67 <0.50 <0.50 <0,50 is <200 <5.0 <0.50 na 52.11 -32.14 clear 919104 <50 0.84 <0.50 <0.50 <0.50 320 <0.50 <0.50 <0.50 20 <500 <5.0 <0.50 na 57.17 -37.20 clear 12/16/04 <50 <0.50 <0.50 <0.50 <0.50 94 na na na na na na na na 53.54 -33.57 clear 313/05 <50 <0.50 <0.50 <0.50 <0.50 21 <0.50. <0.50 <0.50 <5.0 <50 <5.0 <0.50 na 50.14 -30.17 clear 6116/05 <50 <0.50 <0.50 <0.50 <0.50 17 na na na na na na na na 49.90 -29.93 Gear 641gmr As Project No.1641.46 Page 4 of 13 HORIZON ENVIRONMENTAL INC.