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TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No.3641 1210 E.Hammer Lane,Stockton,California Deprh�a TOC GW Well TPHg benzene toluene ethylbenzene xylenes MTBE DIPS ETRE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date (ugA) (ugA) (ugA) (ugA) (ugA) (ugA) (ugA) (ugA) (ugA) (ugA) (ugA) (ugA) (ugA) (ugA) (feet) (feet msl) (feel msl) Comments MW-5 10102!97 87000 21000 10000 2000 10000 3800 <5.0 <5.0 <5.0 <500 450000 <10000 no no 57.33 99.58 42.25 no sheen,no odor screened 03/31/98 10000 2100 1500 270 710 530 no no no no no na no no 1 49.19 50.39 no sheen, odor interval 06110198 3100 510 470 45 310 180 no na no no no no na no 46.22 53.36 no sheen, odor 50'-75' 09!08!98 24000 6500 1000 920 1400 4500 42.5 <2.5 34 48 3600 <25 no na 49.55 50.03 no sheen, odor 12130M 340 32 <2.5 2,9 <2.5 980 no no na no no no na na 44.10 55.46 no sheen, odor 03125199 540 100 1.8 12 3.6 280 <10 <10 <10 <100 450 <5.0 no no 41.47 58.11 odor)no sheen, 06/02199 2700 1200 83 230 120 1200 40,50 40.50 <0.50 51 <50 <5,0 40.50 <0.50 42.51 57.07 odor I no sheen, Oa/31199 30000 4700 3700 1700 2600 9100 <0.50 0,51 4.1 310 <500 <5.0 <0,50 <0.50 48.10 51.48 no comment 12109/99 3100 32 5.2 40 8.7 6200 <5.0 <5.0 <5 0 85 <500 <50 <5 0 <5.0 44.96 54.62 no comment 03/01/00 <500 21 <5,0 45.0 <5.0 4500 <5.0 <5.0 <5.0 72 4500 <50 na na 42.51 57.07 no comment 06/06/00 3400 800 74 240 120 3900 <5.0 <5.0 <5.0 180 .4500 <50 <5.0 <5.0 42.15 57.43 dear 09/14/00 15000 1300 880 1100 1100 2600 <5.0 <5.0 45.0 180 <700 <50 <5.0 <5.0 48.18 51.40 dear 12/12/00 <500 42 7.9 12 20 3200 na no no no na no no no 43.87 55.71 dear 03/19/01 Q00 a.1 <2.0 <2 0 42.0 1900 no no na no no no no no 41.45 58.13 clear 06/19/01 9300 1700 500 420 690 5600 no no no na no no no no 45.31 54.27 clear 09/27/01 5100 230 170 450 460 1100 no no na no no no na na 50.24 49.34 sheen 12/13701 620 32 5.3 19 23 1900 no no na na no no no no 46.49 53.09 sheen 03/28/02 350 36 <2.5 9.7 24 1600 no no no na no no no no 43.17 19.49 -23.68 no comment 06/19/02 7000 1300 410 360 510 3100 no no no no na no no no 45.85 -26.36 no comment 09116!02 a100 490 170 490 960 1700 <0.50 <0.50 1.6 72 <500 <50 <0.50 <0.50 50.86 -31.37 dear 12/26/02 460 10 4.4 3.9 10 1300 no no na na no no no na 47,46 -27.97 dear 03126!03 370 14 5.0 42.5 11 1400 no no no no no no no no 45.16 -25.67 clear 06127103 10000 1600 460 420 640 6300 <10 <10 <10 <100 <1000 <100 410 no 47.91 -28.42 dear 09/19703 6300 810 59 320 580 4100 no na na na na na na na 54,35 -34.86 dear 12x30103 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 49.66 •30.17 clear 03/26104 <250 .42.5 <2.5 <2.5 <2.5 1700 <2.5 42.5 <2.5 30J <250 <25 <2.5 na 47.45 -27.96 no comment 06117704 ns ns ns ns ns ns na ns ns ns ns ns ns ns 51.88 -32.39 not sampled 09109/04 9000 1500 540 240 640 5100 <10 <10 <10 150 J <1000 <100 <10 no 56.86 •37.37 Gear MW-6 12116199 B90 <0.50 <0,50 2.9 <0.50 560 <0.50 <0.50 <0.50 54 <100 <10 na no 98.20 screened 06106110 220 <0.50 <0.50 <0.50 <0.50 84 <0.50 <0.50 <0.50 48 <50 <5.0 <0.50 <0.50 40.37 57.83 clear interval 09/14100 130 <050 1.5 <0.50 <0.50 63 <0.50 <0.50 <0.50 41 160 <5.0 <0 50 <0 50 46.74 51.46 clear 35'-55' 12)12100 140 <0 50 .40.50 <0.50 <0.50 790 na no no no no na no no 42.93 55.27 clear 03/19101 <200 42.0 <2.0 <2.0 <2.0 1500 no na no na no no no na 40.19 58.01 clear 06)19101 <100 41.0 <1.0 <1.0 <1.0 410 no no no no na no no no 42.89 55.31 clear 09/27111 62 <0.50 40.50 <0'60 .40.50 230 no no no na no no na no 48.87 49.33 dear 12!13/01 4200 <2.0 <2.0 42.0 <2.0 790 no no na no no no no no 45.25 52.95 clear 03/28/02 <200 <2.0 <2.0 <2.0 <2.0 1000 na no no no no na no no 42.01 18.10 -23.91 clear 06/19/02 <200 <2.0 <2,0 <2.0 <2.0 580 no na no no no no no na 43,88 -25.78 dear 09/16702 <100 <1.0 <1.0 <1.0 <1.0 330 41.0 41.0 <1 0 37 <100 <10 <1.0 41.0 49.12 -31.02 cloudy 12/26102 <200 <2.0 <2.0 <2.0 42.0 930 no no na no no no no na 46.22 -28.12 cloudy 03/26103 180 <1.0 <1.0 <1.0 <1.0 660 no no na no no no no no 43.93 -25.83 dear 06/27/03 <200 <1.5 <1.5 <1.5 <1,5 750 H.5 <1.5 <1.5 46 <200 <20 <1.5 no 45.91 •27.81 clear 09/19103 260 16 <1.5 23 41.5 670 no no no no no no no no 52.75 •34.65 clear 12130/73 4100 41.0 41.0 41.0 41.0 430 na no no no no na no no 48.55 -30.45 clear 03/26104 450 <0.50 <0.50 <0.50 <0.50 330 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 no 46.05 -27.95 clear 08117/04 450 <0.50 40.50 <0.50 <0.50 <0,50 <0,50 <0.50 40.50 <5.0 450 <5.0 40.50 no 50.08 -31.98 dear 09/09/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry dry dry 847 gmr.xls Project No,1641.47 Page 5 o(9 HORIZON ENVIRONMENTAL INC.