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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 (ug/1) u 11) (ugA) ug11) (ug11) (ug11) (ugA) (uglq (uglq (uglt) ug11 J (ug11) (uglq [uglq (feet) (feet msl) (feet msq Comments MW-2 10/02197 83000 16000 18000 2600 12000 940 <f0 <10 <10 <1000 <100000 <20ow na na 55.64 98.84 43.20 no sheen,no odor screened 03!31198 1100 68 6 <0.50 9.9 14 na na na na ne na na na 48.45 50.39 no sheen,slight odor interval 06/10198 760 20 1.6 <0.50 1.6 <5.0 na na na na na na na na 45.41 53.43 no sheen,slight odor 50'-75' 09/08198 2000 350 <5.0 62 13 130 <0.50 <0.50 <0 50 24 250 <5.0 na na 48.72 50.12 no sheen,no odor 12130!98 97 5.4 <0.50 <0.50 <0.50 11 na na na na na na na na 43.31 55.53 no sheen,no odor 03/25199 74 2 <0.50 <0 50 <0.50 11 <0,50 <0.50 <0.50 <5.0 <50 <5.0 na na 40.66 58.18 no sheen,no odor 06/02199 1700 5.2 0.8 46 1.1 19 <0.50 <050 <0.50 37 <50 <5.0 <0.50 <0.50 41.70 57.14 no sheen,no odor 08131199 5600 1100 2.6 400 110 930 <2.0 4.0 <2 0 100 <200 <20 2.7 <2.0 47,34 51.50 no comment 12109!99 420 <0.50 <0.50 <0.50 <0.50 720 <0.50 <0.50 0.51 40 <50 <5.0 0.8 <0.50 44.18 54.66 no comment 03101!00 150 <0.50 <0.50 <0.50 <0.50 310 <0.50 <0 50 <0.50 18 <500 <5.0 na na 41.69 57.15 no comment 06106/00 1200 0.6 <0.50 <0.50 <0.50 62 <0.50 <0 50 <0.50 55 <200 <5.0 <0.50 <050 41.37 57.47 clear 09114/00 3400 600 1.8 92 1.0 1000 <0.50 <0.50 0,71 110 <500 <5.0 1.3 <0.50 47,46 51.38 clear 12112100 56 <0.50 <0.50 <0.50 <0.50 1100 na na na na na na na na 43.16 55.68 clear 03119101 <100 <1.0 <1.0 0.0 <1.0 680 na ne he na na na na na 40.64 58.20 clear 06119101 910 <0.50 <0.50 <0.50 <0.50 140 na ne na na na na na na 44.55 54.29 clear 09/27/01 2500 160 0.89 42 2.8 380 na na na na na na na na 4950 49.34 clear 12113!01 170 <0.50 <0.50 <0.50 <0.50 1400 na na na na na na na na 45.68 53.16 clear 03/28/02 <200 <2.0 <2,0 <2.0 <2,0 700 na na na na na na ne na 42.34 18.75 -23.59 clear 06/19102 540 <1.0 <1.0 41.0 <1,0 370 ne na na na 1141 na na na 45.10 -26.35 clear 0911 W02 5700 730 140 450 250 1100 <0.50 <0.50 0.61 82 <100 <10 1.1 <0.50 50.14 -31.39 clear 12!26102 <200 <2.0 <2.0 <2.0 <2.0 1200 na na ne na na na na na 46.65 -27.90 clear 03!26103 <100 <1.0 <1.0 <1.0 <1.0 640 na na na na na na na na 44.38 -2563 clear 05!27103 190 <0.50 <0.50 3.0 1.4 400 <0.50 <O.50 <0.50 24J <50 <5.0 <0,50 na 47.20 -28.45 clear 09119103 6000 530 280 670 470 1000 na na na na ne na na na 53.64 -34.89 clear 12/30/03 400 <1.5 <1.5 <1.5 <1.5 580 na na na na na na na na 48.88 -30.13 Gear 03126104 <100 <1.0 <1 0 <1.0 <1.0 400 <1.0 <1.0 <1.0 <10 <100 <10 <1.0 na 46.64 -27.89 clear 06/17/04 2600 140 5B 170 250 360 <0.50 <0.50 <0.50 38 <1500 <5.0 <0.50 na 51.14 -3239 not sampled 641grrr.xla Project No.1641.47 Page 2 of 11 HORIZON ENVIRONMENTAL INC.