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TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No.3641 1210 E.Hammer Lane,Stockton,California Depth to TOC GW Well TPHg benzene toluene ethylbenzene xylenes MTBE DSPE ETRE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date u A u A u 4 (ug") u A u 11 u A u A u A u A u I u A u A u A feat Teet msl feet msl Comments MW-4 10/02/97 35000 9300 600 1100 3600 1800 <5.0 <5.0 <5.0 <500 <50000 <10000 no no 57.45 100.00 42.55 no sheen,no odor screened 03/31198 2000 14 39 <0.50 7.5 <50 na no na na no no na no 49.72 50.28 no sheen,slight odor interval 06/10/98 2400 6 1.2 <0.50 1.1 12 no no na na no na na no 46.63 53.37 no sheen,slight odor 50'-75' 09/08/98 660 2.9 1 40 <0.50 120 <0 50 <0.50 <0.50 11 230 <5.0 na no 49.87 50.13 no sheen,no odor 12/30/98 180 <0.50 0.88 <0.50 1.2 28 na no no no no no na no 44.56 55.44 no sheen,no odor 03!25!99 80 <0.50 <0.50 <0.50 <0.50 8 <0.50 <0.50 <0.50 5.6 <50 <5.0 no no 41.94 58.06 no sheen,no odor 06102/99 160 <0.50 <0.50 <0.50 <0.50 41 <0.50 <0.50 <0.50 25 <50 <5.0 <0.50 <0.50 42.90 57.10 no sheen,no odor 08!31199 460 6.6 <0.50 0.85 <0.50 540 <0.50 <0.50 <0.50 40 <50 <5.0 <0.50 <0.50 48.39 5161 no comment 12109/99 <50 <0.50 <0.50 <0 50 <0.50 440 <0.50 <0,50 <0.50 24 <50 <5.0 <0.50 <0.50 45.46 5454 no comment 03101100 100 <0.50 <0.50 <0.50 <0.50 110 <0.50 <0,50 <0.50 13 <500 <5.0 no no 42.98 57.02 no comment 06106100 200 <0.50 <0.50 <0.50 <0.50 62 <0.50 <0.50 <0 50 33 <200 <5.0 <0 50 <0.50 42.53 57.47 clear 09114100 120 0.73 <0 50 <0.50 <0.50 1100 <0.50 <0.50 2.2 70 <700 <5.0 <0.50 <0 50 48.58 51 42 clear 12112100 <50 <0.50 <0.50 <050 <0.50 420 no no no no no no no na 44.33 55.67 clear 03/19/01 <50 <0.50 <0.50 <0.50 <0,50 140 na na no no no na no no 41.85 58.15 clear 06119101 69 <0.50 <0.50 <0.50 <0.50 220 no no no no no na na no 45.65 54.35 clear 09127101 <100 <1.0 <1.0 0.0 <1.0 350 no no na na no no na no 50.62 49.38 clear 12/13101 52 <0 50 <0.50 <0.50 <0.50 320 no na no no no no na no 46.87 53.13 clear 03128/02 <50 <0.50 <0.50 <0.50 <0.50 56 no no no no no na no no 43.55 19.97 -23.58 clear 06/19102 81 <050 <0.50 <0,50 <0.50 84 no no na na no no na na 46.21 -26.24 clear 09/16102 <100 <1.0 0.0 <1.0 <1.0 260 <1.0 <10 <1.0 18 <100 <10 <1.0 0.0 5116 -31.19 clear 12/26102 <50 <0.50 <0.50 <050 <0.50 65 na no no no no no no no 47.83 -27.86 ctear 03126103 <50 <0.50 <0.50 <0.50 <0 50 27 no no no no no na no no 45.58 -25.61 clear 06127103 <50 <0.50 <0.50 <0.50 <0.50 42 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0 50 no 48.30 -28.33 clear 09!19103 150 3.2 <0.50 9.7 <0.50 390 no no na na no no no no 54.75 -34.78 clear 12130103 <50 <0.50 <0 50 <0.50 <0.50 96 no na no na no no no na 50.15 -30.18 clear 03126104 <50 <0.50 <0.50 <0.50 <0.50 39 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 no 47.88 -27.91 clear 06/17/04 <50 <0.50 <0.50 <0.50 <0.50 67 <0.50 <0.50 <0.50 18 <200 <5.0 <0.50 na 52.11 -32.14 clear 09!09104 <50 0.84 <0.50 <0.50 <0.50 320 <0.50 <0.50 <0.50 20 <500 <5.0 <0.50 no 57.17 -37.20 clear 12118104 <50 <0.50 <0.50 <0.50 <0.59 94 no no no na no no na no 53.54 -33,57 clear 03103105 <50 <0.5f1 <0.50 <0.50 <0.50 21 <0.50 <0 50 <0.50 <5,0 <50 <5.0 <0.50 no 50.14 -30.17 clear ;'• o Y% 641 gmr.xls Project No.l6 .„�'`•' Pegs';.'.;90 HORIZON ZMR0ljjj '.::.=3r.INC.