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TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No.3641 1210 E.Hammer Lane,Stockton,California Depth to TOC GW Well FTPH9 benzene toluene ethylbenzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Date (ug/1) (ugly --LUL/1) (ugll) (uglq (u 11) (ugll) (ug11) (ug/1) (ug/1) (ug/1) (ug/1) u ) (feet) (feet msl) (feet msl) Comments MW-7 12/16/99 <50 -0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 23 <100 <5.0 no no 100.02 screened 06/06/00 <50 <0.50 -40.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 7.9 <50 <5.0 <0.50 <0.50 42.04 57.98 clear interval 09/14/00 <50 <0.50 -40.50 <0.50 <0.50 2,7 <0.50 <0.50 <0.50 6.0 <50 <5.0 <0 50 <0-50 48.27 51.75 clear 35'-55' 12112/00 <50 <0.50 <0.50 <0.50 -40.50 1.9 no no no no no na no na 44.85 55.17 clear 03119/01 <50 <0.50 <0.50 <0.50 <0.50 1.8 no no no no no no no no 42.04 57.98 clear 06/19/01 <50 <0.50 <0.50 40.50 <0.50 1.0 no no no no no no no no 44.26 55 76 clear 09/27101 <50 <0.50 <0.50 <0.50 <0.50 2.0 no no na no no no no no 50.36 49.66 clear 12/13/01 X50 <0.50 <0.50 <0.50 <0.50 0.71 no na no no no no na no 47.21 52.81 clear 03/26102 <50 <0.50 <0.50 <0.50 <0.50 0.76 no no no no no no no no 43.62 19.97 -23.65 clear 06/19102 <50 <0.50 <0.50 <0.50 <0.50 1.1 no no no na no no no no 45.34 -25.37 clear 09!16102 <50 <0.50 <0.50 <0.50 <0.50 1.2 <0.50 <0.50 -40.50 45.0 <50 6.2 40.50 -0.50 50.61 -30.64 cloudy 12/26102 <50 <0.50 <0.50 <0.50 <0.50 0.72 no no no na na na no no 46.09 -28.12 cloudy 03/26103 <50 <0.50 <0.50 <0.50 <0,50 16 no no no no no no no no 45.78 -25.81 clear 06/27/03 <50 -40.50 <0.50 <0.50 <0.50 1.3 <0.50 -40.50 <0.50 45.0 <50 <5.0 -40.50 na 47.40 -27.43 bear 09/19/03 ns ns ns ns ns ns AS ns ns ns ns ns ns ns dry -- dry 12/30103 ns ns ns ns ns ns ns ns ns ns ns ns n$ ns 50.25 -30.28 clear 03/26/04 <50 <0.50 <0.50 <0.50 <0.50 7.6 -40.50 50.50 <0.50 <5.0 450 <5.0 <0 50 na 47.87 -27.90 clear 06/17104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 51.73 -31.76 not sampled MW-8 12116!99 810 6.3 1.2 <0.50 1.2 -CO 50 <0.50 <0.50 -40.50 9.7 <100 66 na no 101.14 screened 06/06100 330 3.1 <0.50 <0.50 0.58 -40.50 <0.50 <0.50 <0.50 7.8 <50 <5.0 <0.50 <0.50 43.42 57.72 clear interval 09/14100 170 4.3 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 11 <50 <5.0 <0.50 <0.50 49.63 51.51 clear 35'-55' 12/12/00 <50 0.56 <0.50 <0.50 <0.50 <0.50 no no no no na no no no 45.56 55.58 clear 03/19101 <50 <0.50 <0.50 <0.50 <0,50 <0.50 no na no no no no na no 43.01 58.13 clear 06/19101 <50 <0.50 <0.50 <0.50 <0.50 <0.50 no no no no no no no no 46.46 54.68 clear 09/27101 <50 <0.50 <0.50 <0.50 <0.50 <0.50 no no no no no no na no 5173 49.41 clear 12/13/01 <50 <0.50 <0.50 <0.50 <0.50 <0.50 no na no no na no no no 47.99 53.15 clear 03/28102 <50 <0.50 <0.50 <0.50 <0.50 <0.50 no no na no no no no no 44.75 21.07 -23.66 clear 06/19102 <50 <0.50 <0.50 <0.50 <0.50 <0.50 no no no na na no na no 47.11 -26.04 clear 09/16102 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 -40.50 <0.50 <5.0 <50 <5.0 <0.50 <0 50 52.00 -30.93 cloudy 12/26/02 <50 <0.50 <0.50 <0.50 <0.50 <0,50 no no no no no no no no 48.91 -27.84 cloudy 03/26103 <50 <0.50 <0.50 <0.50 <0.50 <0.50 no no no no no no no no 46.69 -25.62 clear 04/11103 -- -- -- -- -- -- -- -- -- -- -- -- well destroyed 6vlgmr.vls Pmjad Na.1641 47 page 6 of 11 HORIZON ENVIRONMK1ffAL INC.