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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 ETRE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Humber Date (ug/1) (ug/11 (ug/1 (ug/1) (ug/1) u tl (ug/1) (ug/1) (ug/1) (u 11)( u n (ug/1) u II u /! feet feet msl Feet msl Comments MW-3 1012/97 1700 90 8.7 0.67 2.6 7.7 <0.50 <0.50 <0.50 <50 <5000 <1000 na na 57.62 99.68 42.06 no sheen,no odor screened 3131198 170 0.67 <0.50 <0.50 <0.50 <5.0 na na na na na na na na 49.14 50.54 no sheen,no odor interval 6110/98 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na na 46.10 53.58 no sheen,no odor 50'-75' 9/8198 <50 4.5 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 12 <50 <5.0 na na 49.74 49.94 no sheen,no odor 12/30/98 <50 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na na na 44.17 55.51 no sheen,no odor 3125/99 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 na na 41.57 58.11 no sheen, no odor 612199 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 5.4 <50 <5.0 <0.50 <0.50 42.67 57.01 no sheen,no odor 8131199 <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 48.17 51.51 no comment 12/9199 <50 <0.50 <0.50 <0.50 <0.50 3.1 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 44.96 54.72 no comment 311100 <50 <0.50 <0.50 <0.50 <0.50 0.91 <0.50 <0.50 <0.50 <5.0 <50 <5.0 na na 42.62 57.06 no comment 616/00 <50 <0.50 <0.50 <0.50 <0.50 0.58 <0.50 <0.50 <0,50 <5.0 <50 <5.0 <0.50 <0.50 42.31 57.37 clear 9/14100 <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 48.15 51.53 clear 12/12/00 <50 <0.50 <0.50 <0.50 <0.50 3.2 na na na na na na na na 43.91 55.77 clear 3/19101 <50 <0.50 <0.50 <0.50 <0.50 1.4 na na na na na na na na 41.59 58.09 clear 6119101 <50 <0.50 <0.50 <0.50 <0.50 <0.50 na na na na na na na na 45,62 54.06 clear 9127101 <50 <0.50 <1.0 <0.50 <0.50 <0.50 na na na na na na na na 50.21 49.47 clear 12/13/01 <50 <0.50 <0.50 <0.50 <0.50 8.3 na na na na na na na na 46.54 53.14 clear 3128102 <50 <0.50 <0.50 <0.50 <0.50 5.0 na na na na na na na na 43.31 19.15 -24.16 clear 6/19/02 <50 <0.50 <0.50 <0.50 <0.50 10 na na na na na na na na 46.20 -27.05 clear 9/16/02 <50 <0.50 <0.50 <0.50 <0.50 18 <0.50 <0.50 <0.50 <5.0 <150 8.9 <0.50 <0.50 51.22 -32.07 clear 12/26/02 <50 <0.50 <0.50 <0.50 <0.50 6.7 na na na na na na na na 47.56 -28.41 cloudy 3126103 <50 <0.50 <0.50 <0.50 <0.50 5.4 na na na na na na na na 45.30 -26.15 clear 6/27/03 <50 <0.50 <0.50 <0.50 <0.50 11 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 na 48.30 -29.15 clear 9119103 <50 <0.50 <0.50 <0.50 <0.50 14 na na na na na na na na 54.51 -35.36 clear 12/30103 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 49.61 -30.46 clear 3126/04 <50 <0.50 <0.50 <0.50 <0.50 2.8 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 na 47.60 -28.45 clear 6117104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 52.41 -33.26 not sampled 919/04 <50 <0.50 <0.50 <0.50 <0.50 9.6 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 na 57.21 -38.06 clear 12/16/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 52.92 -33.77 not sampled 313105 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 na 49.95 -30.80 clear 6116/05 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 49.82 -30.67 not sampled 8/29105 <50 <0.50 <0.50 <0.50 <0.50 0.54 na na na na na na na na 54.25 -35.10 clear 12/29/05 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 48.50 -29.35 not sampled 641gmr Project No>z ai.48 Page t 13 HORIZON ENVIRONMEN,,.r INC.