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' s+ TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No.3641 1210 E.Hammer Lane,Stockton,California Depth to TOC GW WellTPHg benzene toluene ethylbenzene xylenes MTBE DIPE E7BE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation t�tumber Date u H u A (up/l (ug/1) u A (ug/1) u 11 u A (ug/1) u A u tl (ug/1) (ugh) u 11 feel feet msl feet msl Comments MW-3 10102/97 1700 90 8.7 0.67 2.6 7,7 <0.50 <0.50 <0.50 <50 <6000 <1000 no no 57.62 99.68 42.06 no sheen,no odor screened 03/31/98 170 0.67 <0,50 <0.50 <0.50 <5.0 no na no no no na no na 49.14 50.54 no sheen,no odor intervat 06110198 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 no na no no na no no na 46.10 53.58 no sheen,no odor 50'-75' 09108198 <50 4.5 <0.50 <0.50 <0 50 <0.50 <0.50 <0.50 <0.50 12 <50 <5.0 no na 49.74 49.94 no sheen,no odor 12!30198 <50 <0.50 <0.50 <0.50 <0 50 <5 0 no no na no no no no ne 44.17 55.51 no sheen,no odor 03!25199 <50 <0 50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 no na 41 57 58.11 no sheen,no odor 06/02M <50 <0.50 <0.50 <0.50 <0.50 <0 56 <0.50 <0,50 <0.50 5.4 <50 <5 0 <0.50 <0.50 4267 57,01 no sheen,no odor 08/31199 <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 12109199 <50 <0.50 <0.50 <0.50 <D.50 3.1 <0.50 <0.50 <0 50 <5.0 <50 <5.0 <0.50 <0.50 44,96 54.72 no comment 03101100 <50 <0.50 <0.50 <0.50 <0.50 0.91 <0.50 <0 50 <0.50 <5.0 <50 <6,0 no no 42.62 57.06 no comment 06106100 <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 09114100 <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 12112100 <50 <0.50 <0.50 <0.50 <0.50 3.2 no no no no no na no no 43.91 55.77 clear 03/19101 <50 <0.50 <0.50 <0.50 <0.50 1.4 na na no na no no no no 41.59 58.09 clear 06119/01 <50 <0.50 <0.50 <0.50 <0.50 <0 50 no no no no no no na na 4662 54.06 clear 09127/01 <50 <0.50 <1 0 <0.50 <0.50 <0.50 na no no no no na no no 50.21 49.47 clear 12!13101 <50 <0.50 <0.50 <0.50 <0.50 8.3 no na na no no na na no 46.54 53.14 clear 03128102 <50 <0.50 <0.50 <0.50 <0.50 5.0 na no na na na no na no 4331 19.15 -24.16 clear 06119t02 <50 <0.50 <0.50 <0.50 <0.50 10 na no no no na no no na 46.20 -27.05 clear 09116/02 <50 <0.50 <0.50 <0.50 <0.50 1B <0.50 <0.50 <0.50 <5.0 <150 8.9 <0.50 <0.50 51.22 -32.07 clear 12126102 <50 <0.50 <0.50 <0.50 <0.50 6.7 no na na no no no no no 4756 -28.41 cloudy 03!26!03 <50 <0.50 <0,50 <0.50 <0.50 5A na no na na na no na no 4530 -26.15 clear 06127103 <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 09119103 <50 <0.50 <0.50 <0.50 <0.50 14 no no na na no na na na 54.51 -35.36 clear 12130103 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 49.61 -30.46 clear 03126104 <50 <0.5o <0.50 <0.50 <0.50 2.8 <0.50 <0.50 <0 50 <5.0 <50 <5.0 <0.50 no 47.60 -28.45 clear 06117104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 52.41 -33.26 notsampled 09109!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 no 57.21 -3806 clear 12116104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 52.92 -33.77 not sampled 03/03105 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 no 49.95 -30.80 clear 04lgmcRls N.1-M. Page 3 of 10 HORIZON ENVIRONMENTAL INC.