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TABLE I GROUNDWATER MONITORING DATA Beacon Station No.3641 1210 E.Hammer Lane,Stockton,California Depth to TOC GW Well TPk9 benzene toluene ethylbenzene xylenes MTBE RIPE ETBE TAME TBA methanot ethanol DCA EDB GW Elevation Elevation Number Date (u (ug#) (u (u II) (ug/l) llug/0 (u /I) (ULA (u /1) (u ) (ug/4 (u (u /I (ug/1) (feet) feet mal (feet mail Comments MW-2 10/02197 83000 16000 16000 2600 12000 940 <10 <10 <10 <1000 <100000 -20000 no no 55.64 98.64 43.20 no sheen,no odor screened 03/31198 1100 68 6 <0.50 9.9 14 no no no na no no na no 48,45 50.39 no sheen,slight odor interval 06/10/98 760 20 1.6 <0.50 1.6 <5 0 no no na no na no no no 45.41 53.43 no sheen,slight odor 50'-75' 09/08/98 2000 350 <5.0 62 13 130 <0.50 <0-50 <0.50 24 250 <5.0 na na 46.72 50.12 no sheen,no odor 12130(98 97 5.4 <0.50 <0.50 <0-50 11 na no no no no na no no 43.31 55.53 no sheen,no odor 03/25/99 74 2 4.50 <0.50 <0 50 11 <0.50 <0.50 <0.50 4.0 <50 <5.0 na no 40.66 58.18 no sheen,no odor o6102/99 1700 5.2 0.8 46 1.1 19 <0.50 <0.50 <0.50 37 <50 <5.0 <0.50 <0-50 41.70 57.14 no sheen,no odor 08/31/99 5600 1100 2.6 400 110 930 Q.0 <2,0 <2.0 100 <200 <20 2.7 <2.0 47.34 51.50 no comment 12/09/99 420 <0.50 <0-50 <0.50 0.50 720 4.50 <0.50 0.51 40 <50 <5.0 0.8 <0.50 44.18 5466 no comment 03/01100 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 06/06/00 1200 0.6 <0.50 <0.50 -0.50 62 <0,50 <0 50 <0.50 55 -200 <5.0 <0.50 4.50 41.37 57.47 clear 09/14/00 3400 800 1.8 92 1.0 1000 <0.50 <0.50 0.71 110 <500 <5.0 1.3 <0.50 47.46 5138 clear 12112/00 56 <0.50 <0.50 <0.50 <0.50 1100 no no no no na no na no 43.16 55.68 dear 03/19/01 <100 <1.0 <1.0 0.0 <1.0 680 no no no na na no na no 40.64 58.20 clear 06/19/01 910 <0.50 <0.50 <0.50 <0.50 140 no no no no na na no no 44.55 54.29 clear 09/27/01 2500 160 0.89 42 2.8 380 no no no na na na na na 49.50 49.34 clear 12/13/01 170 <0.50 <0.50 4.50 <0.50 1400 na no na na na no na no 45.68 53.16 clear 03128/02 <200 <2.0 <2 0 <2.0 Q.0 700 no no na no no na no no 4234 18.75 -23.59 clear 06/19102 540 0.0 <1.0 <1.0 0.0 370 no no no no na na na no 45.10 -26.35 clear 09/16!02 5700 730 140 450 250 1100 <0.50 <0.50 0.61 82 <100 <10 1.1 <0.50 50.14 -31.39 clear 12/26/02 <200 <2.0 -2.0 <2.0 <2.0 1200 na na no no na no na na 46.65 -27.90 clear 03/26/03 <100 0.0 0.0 0.0 <1.0 640 no no na no na no no na 44.38 -25.63 clear 06127/03 190 <0.50 <0.50 3.0 1.4 400 <0.50 <0.50 <0.50 24J -50 <5.0 <0.50 no 47.20 -26.45 clear 09/19!03 6000 530 280 670 470 1000 no no no no na no no no 53.64 -34.89 clear 12130)03 <200 <1.5 <1.5 <1.5 <1.5 580 no na na no no na no no 48.88 -30.13 clear 03/26/04 <100 <1.0 <1.0 <1.0 <1.0 400 <1.0 c1.0 <1.0 <10 <100 <10 <1.0 no 46.64 -27.89 clear 06!17104 2600 140 58 170 250 360 <0.50 <0.50 <0.50 38 <1500 <5.0 <0.50 no 51.14 -32.39 not sampled 09/09/04 2800 240 30 280 69 980 <2.5 <2.5 <2.5 30 J <1800 <20 <2.0 na 56.28 -37,53 clear 12116/04 <50 <0.50 <0.50 -0.50 <0.50 470 no na na na no na no no 52.33 -33.56 clear 6e1gmr R4 �- ProjectNo.Tsai.., Page14i_'>�� HORIZON ENVIRONAdE11- INC.