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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 DIPS ETRE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date (ug1) (ugA) (ugA) (ugA) (ugA) (ugA) (ugA) (ugA) (ugA) (ugA) (ugA) (ugA) (ugA) (ugA) (feet) (feet msl) (feet msl) Comments MW-7 12116/99 <50 <0.50 <0.50 <0.50 40.50 40.50 <0.50 <0.50 40.50 23 <100 .45.0 no na 100.02 screened 06/06100 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 40.50 <0.50 7.9 450 <5.0 <0.50 <0.5 42.04 57.98 clear interval 09114/00 <50 <0.50 <0 50 40.50 <0.50 2.7 <0.50 <0.50 <0.50 6.0 450 <5.0 <0.50 40.50 48.27 51.75 clear 35'-55' 12/12/00 <50 <0.50 <0.50 <0.50 <0.50 1.9 na no no no na no na no 44.65 55.17 clear 03/19/01 .450 <0.50 <0.50 <0.50 <0 50 1.8 no na no no na no na na 42.04 57.98 dear 06/19101 <50 <0.50 <0.50 <0.50 <0.50 1.0 no no no no na no no na 44.26 55.76 clear 09!27101 <50 <0.50 <0.50 40.50 <0.50 2.0 na no no no no no na no 5036 49.66 dear 12113101 <50 40.50 <0.50 <0.50 <0.50 0.71 na na na na no no no na 47.21 52.81 dear 03/28102 <50 <0.50 <0.50 <0.50 <0.50 0.76 no na na no na no no ns 43.62 19.97 -23.85 dear 06/19102 <50 <0.50 <0.50 <0.50 <0.50 1.1 no no no no no no no no 45.34 -25.37 dear 09116102 <50 <0.50 <0.50 <0.50 <0.50 1.2 <0.50 40.50 <0.50 45.0 <50 6.2 <0.50 40.50 50.61 -30.64 cloudy 1226102 <50 <0.50 40.50 <0.50 <0.50 0.72 no no no no no no na no 46.09 -28.12 cloudy 03/26/03 <50 <0.50 <0.50 <0.50 <0.50 1.6 na no no no na no no na 45.78 -25.81 dear 06/27103 <50 <0.50 <0.50 <0.50 <0.50 1.3 <0.50 <0.50 <050 <5.0 <50 <5.0 <0.50 no 47.40 -27.43 dear 09119/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry -- dry 12/30/03 ns ns ns ns ns ns ns ns ns ns ns ns no ns 50.25 -30.28 dear 03/26/04 <50 <0.50 <0.50 <0 50 <0.50 7.6 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 no 47.87 -27,90 dear 06/17/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 51.73 -31.76 not sampled ,. 09/09104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry dry dry MW-8 12/16/99 810 6.3 1.2 <050 1.2 <0.50 40.50 <0.50 <0.50 9.7 <100 66 no no 101.14 screened 06/06/00 330 3.1 <0.50 <0.50 0.58 <0.50 <0.50 40.50 <0.50 7.6 <50 <5.0 <0.50 <050 43.42 57.72 clear interval 09/14/00 170 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 dear 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 Gear 03119!01 <50 <0.50 40.50 <0.50 <0.50 <0.50 no no no no no no na na 43.01 58.13 dear 06/19/01 <50 <0.50 <0.50 <0.50 <0.50 <0.50 no no no no no no no na 46.46 54.68 clear 09/27/01 <50 <0.50 <0.50 <0.50 <0 50 <0.50 na no na na no no no no 51.73 49.41 dear 12/13/01 <50 <0.50 <0.50 <0.50 <0.50 <0.50 na no no no no no no na 47.99 53.15 dear 03128!02 <50 <0.50 40.50 <0.50 40.50 <0.50 no na no no na na no no 44.75 21.07 -23.68 dear 06/19/02 <50 <0.50 <0.50 <0,50 40.50 <0.50 no no na no no no no no 47.11 -26.04 clear 09/16/02 <50 .40.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 45.0 <50 <5.0 <0.50 <0.50 52.00 -30.93 cloudy 1226102 <50 <0.50 <0.50 <0.50 <0.50 <0.50 no no no no na no no no 48.91 •27.84 cloudy 03/26!03 <50 <0.50 <0.50 <0.50 <0.50 <0.50 no na na no na no no no 46.69 -25.62 clear 04/11/03 -- -- -- -- -- well destroyed 541gmr.zls Project No.1641.47 Page 6 of 9 HORIZON ENVIRONMENTAL INC.