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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 EDB GW Elevation Elevation Number Date (ug/1) (u A (ug/1) (ug/1) (ug") (ug/1) (ugh) (ug/1) u /l ug/1) (u 11) ((ug/1) WWI) WWI) feet feet msl feet msl Comments VW-3 3125199 33000 1600 8100 1800 5400 660 <5.0 <5.0 <5.0 140 <50 <5.0 na na 42.07 nm nm slight odor 1 no sheen screened 612199 13000 6000 180 1400 300 4000 <0.50 <0.50 2.6 85 <200 <5.D <0.50 <0.50 42.45 nm slight odor lno sheen interval 8131199 11000 860 230 470 140 6900 <10 <10 <10 300 <1500 <100 <10 <10 47.66 nm no comment 45'-55' 1219199 11000 1200 550 560 430 6200 <5.0 <5.0 <5.0 100 <500 <50 <5.0 <5.0 45.60 nm no comment 311100 12000 500 440 680 980 5000 <20 <20 <20 <200 <2000 <200 na na 42.94 nm no comment 616100 5900 1400 170 340 260 5600 <2.0 <2.0 3.9 260 <2000 <20 <2.0 <2.0 42.00 nm clear 9114/00 2600 760 52 85 120 2400 <2.0 <2.0 <2.0 110 <250 <20 <2.0 <2.0 48.28 nm clear 12/12/00 3700 220 180 140 280 5500 na na na na na na na na 44.63 nm clear 3119101 2600 110 72 150 160 2700 na na na na na na na na 41.81 nm clear 6119101 11000 2900 450 280 860 6700 na na na na na na na na 44.50 nm clear 9127101 860 78 10 12 26 1700 na na na na ne na na na 50.45 nm clear 12/13/01 1300 280 21 33 62 2400 na na na na na na na na 46.99 nm clear 3128102 2900 91 52 150 170 2200 na na na na na na na na 43.63 20.06 -23.57 clear 6119102 10000 2300 280 350 1100 5400 na na na na na na na na 45.46 -25.40 clear 9116102 1400 170 34 52 74 1900 <5.0 <5.0 <5.0 62 <500 <50 <5.0 <5.0 50.66 -30.60 clear 12/26/02 1100 75 16 41 60 1600 na na na na na na na na 47.95 -27.89 clear 3126103 2100 150 15 64 150 1900 na na na na na na na na 45.55 -25.49 clear 6127103 6200 1600 .100 130 390 6500 <10 <10 <10 <100 <1000 <100 <10 na 47.41 -27.35 clear 9119103 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 12/30103 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 50.17 -30.11 clear 3126104 2200 590 12 32 130 2700 <10 <10 <10 <100 <1000 <100 <10 na 47.70 -27.64 clear 6117104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 51.65 -31.59 not sampled 919104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry dry dry 12/16/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 53.50 -33.44 not sampled 313105 1100 48 48 38 85 620 <1,5 <1.5 <1.5 3700 <150 <15 <1.5 na 49.65 -29.59 clear 6116105 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 49.08 -29.02 not sampled I Project Na`: :::i48 Page,,,: a'13 HORIZON ENVIRONMEill� INC.