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TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No.3641 1210 E.Hammer Lane,Stockton,California Depth to TOC ow Well TPHg benzene toluene elhylbenzene xylenes MTBE RIPE ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Dale (UQ4) (ug") u A M10 (ug/1) (ug/1) (u 11) u A (ug/1) u A (ug") (ug/1 u A u A feet feet msl feet msl comments MW-1 11114/96 14000 4400 1200 510 1300 1200 na no no na no na na na 57.02 99.53 42.51 sheen screened 03!18197 1900 220 17 <1.3 13 270 no na no no no no na no 51.25 48.28 none interval 03!31!98 370 28 29 5.2 15 95 no na no na no na na na 49.09 50.44 no sheen,no odor 60'-80' 06110!98 <50 <0.50 <0 50 <0.50 <0.50 29 na ne no na no na na na 46.06 53.47 no sheen,no odor 09/08198 840 190 73 <5.0 130 1100 <0.50 <0.50 0.81 20 2200 <5.0 na no 49.55 49.98 no sheen, odor 12130M <50 0.96 <0.50 <0.50 <0.50 65 na na na no na na no na 44.03 55.50 no sheen, odor 03!25199 80 <0.50 <0.50 <0.50 <0.50 66 <0.50 <0.50 <0.50 5.6 <50 <5.0 no no 41,41 58.12 odor I no sheen, 06/02/99 60 <0.50 <0,50 <0.50 <0.50 45 <1.0 <1.0 0.0 <10 <50 <10 <1.0 <1.0 42.50 57,03 odor 1 no sheen, 08131/99 1500 82 3.6 54 3 3400 <0.50 <0.50 1.3 140 <500 <5.0 <0.50 <0.50 48.10 51.43 no comment 12109/99 69 1.2 2.5 <0.50 24 640 <0.50 <0.50 <0.50 6.4 <50 <5.0 <0.50 <0.50 44.86 54.67 no comment 03/01/00 <200 <2.0 <2.0 Q_0 <2.0 1000 <2.0 <2.0 <2.0 <20 <300 <20 na na 42.45 5708 no comment 06/06/00 <100 <1.0 <1.0 <1.0 <1.0 490 <1.0 <1.0 <1.0 29 <300 <10 <1.0 <1.0 42.14 57.39 clear 09/14/00 170 14 <1.0 2.1 <1.0 2000 <1.0 <10 <1.0 59 <1000 <10 <1.0 <1.0 48.15 51.38 clear 12/12/00 <50 <0.50 <0.50 <0.50 <0 50 2.0 no na no no na no na na 43.85 55.68 clear 03/19/01 <50 <0.50 <0.50 <0.50 <0.50 3.9 na no na na na no no no 41.41 58.12 clear 06/19/01 <50 <0.50 <0.50 <0.50 <0.50 1.6 no na no na na no no no 45.45 54.08 clear 09/27/01 <50 <0.50 <0.50 <0 50 0.60 51 no na no na na no no na 50.18 49.35 clear 12/13/01 <50 <0.50 <0,50 <0.50 <0.50 270 na na na na na no na na 46,41 53.12 clear 03128/02 52 <0.50 <0.50 <0.50 <0.50 360 no na na no na na no na 43.11 19.47 -23.64 clear 06/19/02 <50 <0.50 <0.50 <0.50 <0.50 410 no na na na no na na na 45.95 -26.48 clear 09/16/02 <200 0.96 <0.50 <0.50 1.1 630 <0.50 <0.50 <0.50 17 <50 <5.0 <0.50 <0,50 51.01 -31.54 clear 12/26/02 <50 <0.50 <0 50 <0.50 <0.50 220 na na no no na no na no 47.36 -27.89 clear 03/26/03 <50 1.8 2.7 <0.50 2.1 280 no na na no na no na no 45.10 -25.63 clear 06/27103 170 34 20 1.8 11 160 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 na 48.10 •28.63 clear 09/19/03 <50 10 0 91 <0.50 0.68 800 no na na na na no na no 54.42 -34.95 clear 12/30/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 49.49 -30.02 clear 03126t04 <50 <0.50 <0.50 <0.50 <0.50 110 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 na 47.41 -27.94 clear 06/17/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 52.15 -32.68 not sampied 09/09/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 57.12 -37.65 not sampled 12/16/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 52.84 -33.37 not sampled 03/03/05 <50 <0.50 <0.50 <0.50 <0.50 96 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 na 49.68 -30.21 clear B41gmr.xls Project No.1641.47 Page 1 of 10 HORIZON ENVIRONMENTAL INC.