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TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No.3641 1210 E.Hammer Lane,Stockton,California Depih to TOC OW WellTPHg benzene toluene ethylbenzene xylenes MTBE DIPE ETRE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date (u /1} (u /1) (Vg/4 (u 11) (u /1) (u I) (u /f) (u /I (ug/1) (u /I} (u I) (u !I} {u /) (ug/1) {feet) (feet msl} (fee(rnsl)T Comments VW-3 03125/99 33000 1600 8100 1800 5400 660 <5.0 <5.0 <5.0 140 <50 <5.0 no no 42.07 nm nm slight odor/no sheen screened 06/02199 13000 6000 180 1400 300 4000 <0.50 <0.50 2.6 65 <200 <5.0 <0.50 <0.50 42.45 nm slight odor I no sheen interval 08/31199 11000 860 230 470 140 6900 <10 <10 <10 300 <1500 <100 <10 <10 47.66 nm no comment 45'-55' 12!09199 11000 1200 550 560 430 6200 <5.0 <5.0 <5.0 100 <500 <50 <5.0 <5.0 45.60 nm no comment 03/01/00 12000 500 440 680 960 5000 <20 <20 <20 <200 <2000 <200 no no 42.94 nm no comment 06/06/00 5900 1400 170 340 260 5600 <2.0 <2.0 3.9 260 <2000 <20 <2.0 <2.0 42.00 nm clear 09/14/00 2600 760 52 65 120 2400 <2.0 <2.0 <2.0 110 <250 <20 <2.0 <2 0 48.28 nm clear 12/12!00 3700 220 180 140 280 5500 no no no no na no no no 44.63 nm clear 03119/01 2600 110 72 150 160 2700 no na na no na no no na 41 81 nm clear 06/19/01 11000 2900 450 280 860 6700 no no no no no no no no 44.50 nm clear 09127/01 860 78 10 12 26 1700 no no no no na no no no 50.45 nm clear 12/13/01 1300 280 21 33 62 2400 no na na no no no no na 46.99 nm dear 03128/02 2900 91 52 150 170 2200 no no no no na no no no 43.63 20.06 -2357 clear 06/19/02 10000 2300 280 350 1100 5400 no no na no no no no na 45.46 -25.40 clear 09/16102 1400 170 34 52 74 1900 <5.0 <5.0 <5.0 62 <500 <50 <5.0 <5.0 50.66 -30.60 clear 12/26/02 1100 75 16 41 60 1600 no no no na no na no no 47.95 -27.69 clear 03126/03 2100 150 15 64 150 1900 no no no no na no no no 45.55 -25.49 clear 06/27103 6200 1600 100 130 390 6500 <10 <10 <10 <100 <1000 <100 <10 na 47,41 -27.35 Clear 09/19/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 12/30/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 50.17 -30.11 clear 03126/04 2200 590 12 32 130 2700 <10 <10 <10 <100 0000 <100 <10 na 47.70 -27.64 clear 06117104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 51 65 -31.59 not sampled 09/09104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry dry dry 12/16/04 ns ns ns ns ns ns ns ns ns ns ns ns AS ns 53.50 -33.44 not sampled VW-5 03/25/99 ns ns AS ns ns ns ns ns ns ns ns ns ns ns nm nm nm screened 06/02/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm interval 06131/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 47.73 nm 0 05 It FP/sheen 40'-50' 12/09/99 100000 13000 10000 570 16000 31000 <20 <20 <20 <200 <2000 <200 <20 <20 45.70 nm no comment 03/01/00 27000 5100 520 1500 770 14000 <50 40 <50 <500 <5000 <500 no na 42.47 nm no comment 06/06/00 43000 7700 4600 1300 3700 16000 <10 <10 <10 750 <2500 <100 <10 <10 41.84 nm clear 09/14100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 48.03 nm considered dry 12/12/00 16000 1000 1100 480 1800 24000 no no no na na no no no 44.01 nm clear 03/19/01 29000 3300 4400 740 3000 20000 no no no no no no na no 41.38 nm clear 06/19/01 120000 16000 13000 2300 11000 41000 no na no no na no no na 44.71 nm clear 09/27/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry dry dry 12/13/01 23000 2000 510 180 790 26000 ns ns ns ns ns ns ns ns 46.51 nm sheen 03128/02 10000 760 sea 89 330 14000 ns ns ns no ns ns ns ns 43.09 19.39 .23.70 no comment 06/19/02 21000 3900 2300 190 750 20000 no no na no no no no no 45.42 -26.03 no comment 09/16102 ns ns ns ns ns ns ns ns ns ns ns no ns ns 48.86 -29.47 no comment 12/26/02 58000 5500 4200 1000 4500 35000 no no no no no no na na 47.41 -28.02 clear 03126/03 68000 7500 8200 1300 6400 34000 na no no no no no no no 45.11 -25.72 clear 06/27/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 47.45 -28.06 considered dry 09/19/03 ns ns ns ns ns ns ns ns ns n$ ns ns ns ns dry dry dry 12/30/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry dry dry 03/26/04 48000 4900 3200 730 4700 25000 <50 <50 <50 10001 <5000 <500 <50 no 47.34 -27.95 odor 06117/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry dry dry 09!04104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry dry dry 12116104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry dry dry Piojact NO.is4i ''4"' Page'c ; HORIZON ENVIRONME INC.