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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 DIPE ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date (ugA) (ug11) (ug/1) (ugA) (ugA) (ugll) u911 (ugA) (ugA) (ugA) (u 11) (ug/1) (ug/1) (ug/1) (feet) feet ms]) (feet msl) Comments MW-1 11114196 14000 4400 1200 510 1300 1200 no na no no na no na no 57.02 99.53 42.51 sheen screened 03/18197 1900 220 17 <1.3 13 270 no no no no na no na na 51.25 48.28 none interval 03/31198 370 28 29 5.2 15 95 no no no no na no na no 49.09 50.44 no sheen,no odor 60'-80' 06/10/98 <50 <0.50 <0.50 <0.50 <0.50 29 no no no no na no na na 46.06 53.47 no sheen,no odor 09/08198 040 190 73 <5.0 130 1100 <0.60 <0.50 0.81 20 2200 <5.0 na na 49.55 49.98 no sheen, odor 12/30/98 <50 0.96 <0.50 <0.50 <0.50 65 na no no no no no na na 44.03 55.50 no sheen, odor 03125M 60 <0.50 <0.50 <0.50 <0.50 68 <0.50 <0.50 <0.50 5.6 <50 <5.0 no na 41.41 58.12 odor I no sheen, 06/02199 60 <0.50 <0.50 <0.50 <0,50 45 <1.0 <1.0 N.0 <10 <50 <10 <1.0 <1.0 42.50 57.03 odor 1 no sheen, 08131199 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 12/09199 69 1.2 2.5 <0.50 2.4 640 <0.50 <0.50 <0.50 6.4 <50 <5,0 <0.50 <0.50 44.86 54.67 no comment 03101/00 <200 <2.0 <2.0 <2.0 <2.0 1000 <2.0 <2.0 <2.0 <20 <300 <20 na no 42.45 57.08 no comment 06106100 <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 <1.0 <1.0 59 <1000 <40 <1.0 <1.0 48.15 5138 clear 12/12/00 <50 <0.50 <0.50 <0.50 <0.50 2.0 na no no na na no no no 43.85 55.68 clear 03/19/01 <50 <0.50 <0.50 <0.50 <0.50 3.9 na na na na na no na no 41.41 56.12 clear 06/19101 <50 <0.50 <0.50 <0,50 <0,50 1.6 na no no no no ne na no 45.45 54.08 Gear 09/27/01 <50 <0.50 <0.50 <0.50 0.50 51 na no no no no na no na 50.18 49.35 dear 12/13/01 <50 <0.50 <0.50 <0.50 <0.50 270 no na no na na na na na 46.41 53.12 Gear 03/28102 52 <0.50 <0.50 <0.50 <0.50 360 na no na na na na na na 43.11 19.47 -23.64 Gear 06/19/02 <50 <0.50 <0.50 <0.50 <0.50 410 no no no na na no na na 45.95 -26.48 dear 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 12126/02 <50 <0.50 <0.50 <0.50 <0.50 220 no no no na na na na na 47.36 -27.89 clear 03/26/03 <50 1.8 2.7 <0.50 2.1 280 no no no na na no na no 4510 -25.63 clear 06/27/03 170 34 20 1.8 11 160 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 no 48.10 -28.63 clear 09119/03 <50 1.0 0.91 <0.50 0,68 800 na no na na no na na na 5442 -34.95 clear 12130/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 49.49 -30.02 clear 03126/04 t50 <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 06/17104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 52.15 -32.68 not sampled W tgmr.als Project No.1&11.47 Page 1 of 11 HORIZON ENVIRONMENTAL INC.