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-l. . 34 TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No.3641 1210 E.Hammer Lane,Stockton,California Depth to TOC GW Welt TPHg benzene toluene ethylbenzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date u /1 (yall) u 11 u A u !I u n u A u 11 u A u u 4 u l (ugh) u 11 feet feet msl feet msl Comments MW-5 10102197 87000 21000 10000 2000 10000 3800 <5.0 <5.0 <5.0 <500 <50000 <10000 no no 57.33 99.58 42.25 nosheen,no odor screened 03/31/98 10000 2100 1500 270 710 530 no no no na no no no no 49,19 50.39 no sheen, odor interval 06/10/98 3100 510 470 45 310 180 no no no no no no no no 46.22 53.36 no sheen, odor 50'-75' 09/08/98 24000 6500 1000 920 1400 4500 <2 5 <2.5 3.4 48 3600 <25 no no 49.55 50.03 no sheen, odor 12/30198 340 32 <2.5 2.9 <2.5 980 no na no no no no no no 44.10 55.48 no sheen, odor 03125!99 540 100 1.8 12 36 280 <10 <10 <10 <100 <50 <5.0 no na 41,47 58.11 odor!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 1 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 12/09/99 3100 32 5.2 40 87 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 <5.0 <5.0 4500 <5.0 <5.0 <5.0 72 <500 <50 no no 42.51 57.07 no comment 06106/00 3400 800 74 240 120 3900 <5.0 <5,0 <5.0 180 <500 <50 <5.0 <5.0 42.15 57.43 clear 09114100 15000 1300 880 1100 1100 2600 <5.0 <5.0 <5.0 180 <700 <50 <5.0 <5.0 4818 51.40 clear 12112/00 <500 42 79 12 20 3200 no no no no no no no no 43.87 55.71 clear 03119/01 <200 8.1 <2.0 <2.0 <2.0 1900 no no na no no no na no 41.45 58.13 clear 06119/01 9300 1700 500 420 690 5600 no no no na no no no no 4531 54.27 clear 09127101 5100 230 170 450 460 1100 no no no no na no no no 50.24 49.34 sheen 12!13101 620 32 53 19 23 1900 no na no no no no na na 46.49 53.09 sheen 03128102 350 36 <2.5 9.7 24 1600 no no no no no no no no 43.17 1949 -23.66 no comment 06)19102 7000 1300 410 360 5t0 3100 no na no no no no na no 45.85 -26.36 no comment 09/16102 8100 490 170 490 960 1700 <0.50 <0.50 1.8 72 <500 <50 <0.50 <0.50 50.86 -31.37 clear 12/26/02 460 10 4.4 3.9 10 1300 no no no no na no no no 47.46 -27.97 clear 03!26103 370. 14 5.0 <2.5 11 1400 no no no no no no no no 45.16 -25.67 clear 06!27103 10000 1600 480 420 640 6300 <10 <10 <10 <100 <1000 <100 <10 no 47.91 -28.42 clear 09/19/03 6300 810 59 320 580 4100 no no no no no na no no 54.35 .34.86 clear 12/30/03 , ns ns ns ns ns ns ns ns ns ns ns ns ns ns 49.66 -30.17 clear 03/26/04 <250 <2.5 <2.5 <2.5 <2.5 1700 <2.5 <2.5 <2.5 30J <250 <25 <2.5 no 47.45 -27.96 no commenl 06/17/04 ns ns ns ns ns ns ns 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 clear 12116/04 ns ns ns ns ns ns ns ns ns ns no ns ns ns 53.06 -33.57 not sampled 03103/05 <200 14 <1.5 1.6 13 2000 <1.5 <1,5 1.5, 25J <800 <20 <1.5 no 49.72 -30.23 clear MW-6 12/16/99 890 <0.50 <0.50 2.9 <0.50 560 <0.50 <0.50 <0.50 54 <100 00 no no 98.20 screened 06/06/00 220 <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 09/14/00 130 <0.50 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' 12/12/00 140 <0.50 <0.50 <0.50 <0 50 790 no no no net no no no no 42.93 55.27 clear 03!19101 <200 <2.0 <2.0 <2.0 <2.0 1500 no no no no na no no no 4019 58.01 clear 06!19101 <100 <1.0 <1.0 <1.0 0.0 410 no na no no no no no no 42.89 55.31 clear 09127101 82 <0.50 <0.50 <0.50 <0.50 230 no no na no no no no na 4887 49.33 clear 12!13101 <200 <2.0 <2.0 <2.0 <2,0 790 no no no no no no no no 45.25 52.95 clear 03/28/02 <200 <2.0 <2.O <20 <2.0 1000 no no no no no no no no 4201 18.10 -23.91 clear 06/19/02 <200 <2.0 <2.0 <2 0 <2.0 580 no no no no no no no na 43.88 -25.76 clear 09/16/02 <100 <1.0 <1.0 <1.0 <1.0 330 <1.0 <1.0 0.0 37 <100 <40 <1.0 <1.0 49.12 -31.02 cloudy 12126/02 <200 <2A <2.0 <2.0 <2.0 930 no no no no no no no na 46.22 -26.12 cloudy 03!26103 180 <1.0 <1.0 <1.0 <1.0 660 no no no na no no no na 43.93 -25.83 clear 06127!03 <200 0.5 <1.5 <1.5 <1.5 750 <1.5 <1.5 <1.5 46 <200 <20 <1.5 no 4591 -27.81 clear 09119!03 260 16 <1.5 23 <1.5 670 no no no no na na no no 52.75 -34.65 clear 12130!03 <100 <1.0 <1.0 <1.0 <1.0 430 no no no na no no no na 48.55 -30.45 clear 03126104 <50 <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 06117104 <50 <0.50 <0.50 <0.50 <0.50 <6.50 <0,50 <0.50 <0.50 <5.0 <50 <5.0 <0 50 no 50.08 -31.98 clear 09109104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry dry dry 12116104 <50 <0.50 <0.50 <0.60 <0,50 580 no no no no no na no no 52.15 -34.05 clear 03103105 <50 <0.50 <0.50 <0.50 <0.50 470 <0.50 <0.50 0.68 <5.0 <200 <5.0 <0.50 no 46.40 -30.30 clear 641gmr.xis Project No.1641.47 Page 5 of 10 HORIZON ENVIRONMENTAL INC.