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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 11)_( u tl (ug/1) u 11 u 11 u 11 ug/l)( (ug/1) (ug/1) (ug/1) (ug/1) (ug/1) (ug/1) feet feet msl feet msl Comments MW-9 12/10/04 110 <0,50 39 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <D.50 <0.50 52.79 19.00 -33.79 clear screened 313105 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm not sampled interval 6116105 <50 <0.50 <0.50 <0.50 <0.50 <0.50 na na na na na na <0.50 na 49.16 -30.16 Gear 50'-70' MW-10 12/10/04 <50 <0.50 6.6 <0.50 <0.50 98 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 53.93 20.24 -33.69 clear screened 313105 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm not sampled interval 6/16105' <50 <0.50 <0.50 <0.50 <0.50 62 na na na na na na <0.50 na 50.52 -30.28 clear 50'-70' MW-11 12/10/04 670 8.4 200 6.7 37 0.62 <0.50 <0.50 <0.50 <5.0 <50 16 <0.50 <0.50 54.82 19.58 -35.24 clear screened 313105 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm not sampled interval 6116105 <50 <0.50 1.2 <0.50 <0.50 <0.50 na na 'na na na na <0.50 na 43.68 -24.10 clear 130'-135' MW-12 12/10/04 350 3.0 120 <0.50 0.86 16 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 54.62 19.61 -35.01 clear screened 313105 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm not sampled interval 6116105 <50 <0.50 <0.50 <0.50 <0.50 <0.50 na na na na na na <0.50 na 50.12 -30.51 clear 129'-134' MW-13 12/10/04 <50 <0.50 <0.50 <0.50 <0.50 0.71 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 49.09 19.34 -29.75 clear screened 313105 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm not sampled interval 6116!05 <50 <0.50 <0.50 <0.50 <0.50 0.62 na na na na na na <0.50 na 49.85 -30.51 clear 124'-129' 641 gmr.xls Project No.1641.48 Page 8 of 13 HORIZON ENWRONMENTAL INC.