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TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No.3641 1210 E.Hammer Lane, Stockton, California ethyl- Depth to TOC GW Welt [T�PHjg [benzene toluene benzene xylenes MTBE RIPE ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation /I (ug/1) (ug/1) (ug/1) (ug/1) (ug/1) (ug/1) (ug/1) u A (ug/1) (ug/1) (ug/1) (ug/1) feet feel msl feet msl Comments MW-7 12/16/99 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 23 <100 <5.0 na na 100.02 screened 616100 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 7.9 <50 <5.0 <0.50 <0.50 42.04 57.98 clear interval 9/14100 <50 <0.50 <0.50 <0.50 <0.50 2.7 <0.50 <0.50 <0.50 6.0 <50 <5.0 <0.50 <0.50 48.27 51.75 clear 35'-55' 12/12/00 <50 <0.50 <0.50 <0.50 <0.50 1.9 na na na na na na na na 44.85 55.17 clear 3119101 <50 <0.50 <0.50 <0.50 <0.50 1.8 na na na na na na na na 42.04 57.98 clear 6/19101 <50 <0.50 <0.50 <0.50 <0.50 1.0 na na na na na na na na 44.26 55.76 clear 9127101 <50 <0.50 <0.50 <0.50 <0.50 2.0 na na na na na na na na 50.36 49.66 clear 12/13/01 <50 <0.50 <0.50 <0.50 <0.50 0.71 na na na na na na na na 47.21 52.81 clear 3128/02 <50 <0.50 <0.50 <0.50 <0.50 0.76 na na na na na na na na 43.82 19.97 -23.85 clear 6119102 <50 <0.50 <0.50 <0.50 <0.50 1.1 na na na na na na na na 45.34 -25.37 clear 9116102 <50 <0.50 <0.50 <0.50 <0.50 1.2 <0.50 <0.50 <0.50 <5.0 <50 6.2 <0.50 <0.50 50.61 -30.64 cloudy 12/26/02 <50 <0.50 <0.50 <0.50 <0.50 0.72 na na na na na na na na 48.09 -28.12 cloudy 3126103 <50 <0.50 <0.50 <0.50 <0.50 1.6 na na na na na na na na 45.78 -25.81 clear 6127/03 <50 <0.50 <0.50 <0.50 <0.50 1.3 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 na 47.40 -27.43 clear 9119/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry -- dry 12/30/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 50.25 -30.28 clear 3126/04 <50 <0.50 <0.50 <0.50 <0.50 7.6 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 na 47.87 -27.90 clear 6117104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 51.73 -31.76 not sampled 919104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry dry dry 12/16104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 53.91 -33.94 not sampled 313105 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 61 <5.0 <0.50 na 50.12 -30.15 clear 6116105 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 49.93 -29.96 not sampled 8129/05 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 54.74 -34.77 not sampled MW-8 12/16/99 810 6.3 1.2 <0.50 1.2 <0.50 <0.50 <0.50 <0.50 9.7 <100 66 na na 109.14 screened 616/00 330 3.1 <0.50 <0.50 0.58 <0.50 <0.50 <0.50 <0.50 7.8 <50 <5.0 <0.50 <0.50 43.42 57.72 clear interval 9114100 170 4.3 <0.50 <0.50 <0.50 <0,50 <0.50 <0.50 <0.50 11 <50 <5.0 <0.50 <0.50 49.63 51.51 clear 35'-55' 12112!00 <50 0.56 <0.50 <0.50 <0.50 <0.50 na na na na na na na na 45.56 55.58 clear 3119/01 <50 <0.50 <0.50 <0.50 <0.50 <0.50 na na na na na na na na 43.01 58.13 clear 6119101 <50 <0.50 <0.50 <0.50 <0.50 <0.50 na na na na na na na na 46.46 54.68 clear 9/27101 <50 <0.50 <0.50 <0.50 <0.50 <0.50 na na na na na na na na 51.73 49.41 clear 12/13/01 <50 <0.50 <0.50 <0.50 <0.50 <0.50 na na na na na na na na 47.99 53.15 clear 3/28102 <50 <0.50 <0.50 <0.50 <0.50 <0.50 na na na na na na na na 44.75 21.07 -23.68 clear 6119102 <50 <0.50 <0.50 <0.50 <0.50 <0.50 na na na na na na na na 47.11 -26.04 clear 9116102 <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 52.00 -30.93 cloudy 12/26/02 <50 <0.50 <0.50 <0.50 <0.50 <0.50 na na na na na na na na 48.91 -27.84 cloudy 3/26103 <50 <0.50 <0.50 <0.50 <0.50 <0.50 na na na na na na na na 46.69 -25.62 clear 4111103 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- well destroyed 641gmr.xf ;f 13 Project No.i641.4B Pag4`, HORIZON ENVIRONMENT INC.