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TABLE I 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 GWElevation Elevation Numberil Date (ug1l)_ ug/1) (ug1l) (ug/1) (ug'L (ug1l) (U911) (ug/1) (U911) (ug,l) (u fl) (ugli) (ug1l) (ug1l) (feet) (feet ms Comments MW-s 10102197 87000 21000 10000 2000 10000 3800 <5 a <50 <5.0 4500 <50000 <10000 no no 57.33 99.58 42.25 no sheen,no odor screened 03131198 10" 2100 1500 270 710 530 no no no no no no no no 49.19 50.39 no sheen, odor interval 06110/98 3100 510 470 45 310 lea no no no no no no no no 46.22 53.36 no sheen, odor 50'-75' 09108/98 24000 6500 1000 920 1400 4500 <2.5 <2.6 3.4 48 3600 <25 no no 49.55 50.03 no sheen, odor 12130/98 340 32 <2.5 2.9 <2.5 980 no no no no no no no no 44.10 55.48 no sheen, odor 03/25/99 540 100 1 8 12 3.6 280 <10 <10 <10 <100 450 <5.0 no no 41.47 58.11 odor I no sheen, 06102/99 2700 1200 83 230 120 1200 <0.50 <0.50 <0.50 51 <50 <5.0 <0.50 <0.50 42.51 57.07 odor I no sheen, 08131/99 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 <50o 21 <5.0 45.0 <5.0 4500 <5'0 <5.0 <50 72 <500 <50 no no 42.51 57.07 no comment 06106100 3400 800 74 240 120 3900 <5.0 <5.0 <5.0 180 <500 <50 <5.0 45.0 42.15 57.43 clear 09t14100 15000 1300 080 1100 1100 2600 <5.0 <5.0 <5.0 lea <700 <50 <5.0 <5.0 48.10 51.40 clear 12t12/00 <500 42 7.9 12 20 3200 no na no no no no no no 43.87 55.71 clear 03/19/01 <200 8.1 <2.0 <2.0 <2.0 1900 no no no no no no no no 41.45 58.13 clear 06/19/01 9300 1700 500 420 690 5600 na na no no no no no no 45.31 54.27 dear 09/27/01 5100 230 170 450 460 1100 no no no na no no na no 50.24 49.34 sheen 12/13/01 620 32 5.3 19 23 1900 no no no Re no no no no 46.49 53.09 sheen 03/28102 350 36 <2.5 9,7 24 1600 no no no no no no no no 43.17 19.49 -23.68 no comment 06/19102 7000 1300 410 360 510 3100 no no no no no no no no 45.85 -26.36 no comment 09116102 8100 490 170 490 960 1700 <0.50 <0.50 1.8 72 <00 <50 <0.50 <0.50 50.86 -31-37 clear 12126102 460 10 4.4 3.9 10 130D no na na no no no no no 47.46 -27.97 clear 03/26/03 370 14 5.0 42.5 11 1400 no no no no no no no na 45.16 -25.67 clear 06/27103 10000 1600 480 420 640 6300 <10 <10 <10 -e100 <1000 <100 <10 no 47.91 -28.42 clear 09119103 6300 SIO 59 320 580 4100 na no no no no no no no 54.35 -34.86 clear 12/30103 as ns ns ns ns ns as ns ns ns ns ns ns ns 49.66 -3017 dear 03/26104 450 <2.5 4.5 <2.5 <2.5 1700 42.5 <2.5 <2.5 301 450 <25 <2.5 no 47.45 -27.96 no comment 06/17104 as as ns; as ns ns as ns ns ns ns ng ns ns 51.88 -32.39 not sampled MW-6 12/16M 890 <0.50 <0.50 2.9 <0.50 560 <0.50 <0.50 <0.50 54 <100 <10 no no 98.20 screened 06/06100 220 <050 <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 <0.50 1.5 <0.50 <0.50 63 <0.50 40.50 <0.50 41 160 -5.0 <0.50 <0.50 46.74 61.46 clear 35'-55' 12112100 140 <0.50 <0.50 40.50 <0.50 790 no no no no no no no no 42.93 55.27 clear 03119101 <200 <2.0 <2.0 <2.0 <2.0 1500 no no no no no no no no 40.19 58.01 clear 06119/01 <100 <1.0 41.0 41.0 <11.0 410 no na no no no na no no 42.89 55.31 clear 09/27101 82 <0.50 <0.50 40.50 <0.50 230 no no no no no no no no 4887 49.33 clear 12/13101 <200 <2.0 <2.0 42.0 <2.0 790 no no no no no no no no 45.25 52-95 clear 03/28102 <200 <2.0 <2.0 <2.0 <2.0 1000 no na na no no no no no 42.01 18.10 -23.91 clear 06/19102 400 <2.0 <2.0 <2.0 <2.0 580 no no no no no no no no 43.88 -25.78 clear 09116102 <100 <1.0 <1.0 <1.0 <1.0 330 0.0 <1.0 <11.0 37 <100 <10 41.0 <1.0 49.12 -31.02 cloudy 12126/02 <2150 <2.0 <2.0 <2.0 <2.0 930 no no no no na na no no 46.22 -28.12 cloudy 03126103 180 41.0 <1.0 <1.0 <11.0 660 no no no no no no no no 43.93 -25.83 clear 06/27103 <200 <1.5 <1.5 <1.5 <11.5 750 <15 <1.5 <1.5 46 <200 <20 <1.5 no 45.91 -27.81 clear 09119103 260 is <1.5 23 <11.5 670 no no no no no no no no 52.75 -34.65 clear 12r30J03 <100 41.0 <1.0 <1.0 <11.0 430 na na no na no na no na 40.55 -30.45 clear 03/26104 <50 <0.50 40.50 <0.50 <0.50 330 <0.50 <0.60 <0,50 <5.0 <50 <5.0 <0.50 no 46.05 -27.95 clear 06117104 <50 <0.50 <0.50 -40.50 <0.50 <0.50 <0.50 <0.60 <0.50 45.0 <50 <5.0 <0.50 na 50.00 -31.98 clear 641qmr.Js P-ject No.1641.47 Page 5 of 11 HORIZON EffWRONMENTAL INC.