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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) (uq/1) u A u 11 u 11 (ug/1) (ug/1) (ug/1) (ug/1) u 11 u 11 a 11 u 11 u 11 feet feet msl feet msl Comments VW-5 3125199 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm nm screened 612199 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm interval 8131/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 47.73 nm 0.05 ft FPI sheen 40'-50' 1219199 100000 13000 10000 570 16000 31000 <20 <20 <20 <200 <2000 <200 <20 <20 45,70 nm no comment 311100 27000 5100 520 1500 770 14000 <50 <50 <50 <500 <5000 <600 na na 42.47 nm no comment 616100 43000 7700 4600 1300 3700 16000 <10 <10 <10 750 <2500 <100 <10 <10 41.84 nm clear 9114100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 48.03 nm considered dry 12/12/00 16000 1000 1100 480 1800 24000 na na na na na na na na 44.01 nm clear 3119101 29000 3300 4400 740 3000 20000 na na na na na na na na 41.36 nm clear 6119101 120000 16000 13000 2300 11000 41000 na na na na na na na na 44.71 nm clear 9127101 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry dry dry 12/13/01 23000 2000 510 180 790 26000 ns ns ns ns ns ns ns ns 46.51 nm sheen 3128102 10000 760 580 89 330 14000 ns ns ns ns ns ns ns ns 43.09 19.39 -23.70 no comment 6119102 21000 3900 2300 190 750 20000 na na na na na na na na 45.42 -26.03 no comment 9116102 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 48.86 -29.47 no comment 12/26/02 58000 5500 4200 1000 4500 35000 na na na na na na na na 47.41 -28.02 clear 3126103 68000 7500 8200 1300 6400 34000 na na na na na na na na 45.11 -25.72 clear 6127103 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 47.45 -28.06 considered dry 9119103 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry dry dry 12/30/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry dry dry 3126104 48000 4900 3200 730 4700 25000 <50 <50 <50 1000J <5000 <500 <50 na 47.34 -27.95 odor 6117104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry dry dry 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 dry dry dry 313105 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 48.06 -28.67 considered dry 6116105 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry dry not sampled 541 gmr,xls Project No_1641 48 Page 12 of 13 HORIZON ENVIRONMENTAL INC.