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t'',X. 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 TDA methanol ethanol DCA EDS GW Elevation Elevation Number -Pate (ug/1) (uV) (ua&� u p) (UgA) (u 11) (Ug1l) (u1) (ul/1) (U1u ) (u I) (u 11 (ug/1) (feet► (teetmsl) (feetmsl)l Comments MW-5 110102J97 87000 21000 10000 2000 10000 3800 <5.0 <5.0 <5,0 <500 <50000 d0000 no no 57,33 99.58 42.25 no sheen,no odor screened 03/31/98 10000 2100 1500 270 710 530 na no no no no na no na 49.19 50.39 no sheen odor interval 06110/98 3100 510 470 45 310 100 no no na na 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 <215 no no 49,55 50.03 no sheen, do' 12130/98 340 32 <2.5 2.9 <2.5 980 na na no no no na na no 44.10 55.49 no sheen, odor 03/25/99 540 100 1.8 12 3.6 280 <10 <10 <10 <100 <50 <5.0 no no 41.47 58.11 odor I nosheen 06J02/99 2700 1200 83 230 120 1200 <0.50 <0,50 <0.50 51 <50 <5.0 <0.50 <0.50 42,51 5707 odor Ino sheen, 30000 4700 3700 1700 2600 9100 -0.50 0.51 4.1 310 <500 <5.0 e0.5G <0.50 46.10 51.48 no comment 12/09/99 3100 32 5.2 40 8.7 6200 <5.0 45.0 <5.0 B5 .4500 <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 09/14/00 15000 1300 Boo 1100 1100 2600 .45.0 <5.0 <5.0 180 4700 <50 <5.0 <5.0 4618 51.40 clear 12112100 <500 42 7.9 12 20 3200 no na no na no no no no 43 137 55.71 clear 03119/01 <200 8.1 <2.0 <2.0 <2.0 1900 no no no no no no no no 41.45 513.13 clear 06119101 9300 1700 500 420 690 5600 no no no no no no no no 4631 54.27 cleat 09/27Y01 5100 230 170 450 460 11100 no no no no no na no no 5024 49.34 sheen 12/13101 620 32 5.3 19 23 1900 no no no no no na no no 46.49 53.09 sheen 03/26102 350 36 <2.5 9.7 24 1600 na na "a no no no no no 43.17 19.49 -23.68 no Comment 06/19/02 7000 1300 410 360 510 3100 na no no no no no no no 45.85 -26.36 no comment 09/16/02 8100 490 170 490 960 1700 4.50 <0.50 1.13 72 .4500 <50 <0,50 .40.50 50.86 -31.37 clear 12/26102 460 10 4.4 3.9 10 1300 no no na no no no no no 47.46 -27.97 dear 03/26103 370 14 5.0 <25 11 1400 na na no no no no "a na 45.16 -25.67 clear 06/27103 10000 1600 480 420 640 6300 <10 <10 <10 <100 <1000 <100 <10 no 47.91 -2842 clear 09/19103 6300 810 59 320 Sao 4100 no no no no no no na no 54,35 -34.86 clear 12/30103 ns ns ns ns ns ns na ns ns ns ns ns ns ns 49.66 -30.17 clear 03/26/04 <250 <2.5 e2.5 <2.5 <2.5 1700 c2.5 <2.5 <2.5 30J <250 <25 <2.5 no 47.45 -27.96 no comment 06/17104 no ns ns ns ns; ns ns ns ns ns ns ns ns ns 51.88 -3239 not sampled 09109104 9000 1500 540 240 640 Sloo <10 410 <10 150 j .1000 <100 <10 no 56.86 -37.37 clear 12(16104 ns ns ns ns Ile ns ns ns ns ns ns no ns ns 53.06 -3357 not sampled MW-6 12J16199 090 .0.50 <0.50 2.9 eo.50 560 <0.50 <0.50 <0.50 54 <100 <10 As no 98.20 screened 06/06100 220 <0.50 <0.50 <0.50 <0.50 84 <0.50 40.50 <0,50 48 <50 45.0 <0.50 <0.50 40.37 57.83 clear interval 09/14100 130 <0.50 1.5 4.50 <0.50 63 <0.50 <0.50 <0.50 41 160 <5.0 <0.50 <0.50 46.74 51.46 clear 35'-55' 12112/00 140 4.50 <0.50 <0.50 <0.50 790 no na no no no no na no 42,93 55.27 clear 03/19/01 <200 <2.0 <2.0 <2.0 <2.0 1500 no no no no no no no no 40.19 5801 clear 06/19/01 <100 <1.0 <11.0 <1,0 <1.0 410 no no no no no no 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 413,87 49.33 clear 12113/01 <200 <2.0 42.0 <2.0 <2.0 790 no no na no no no no no 45.25 52.95 clear 03/28/02 <200 <2.0 <2.0 <2.0 <2.0 1000 no no na no no no no na 4201 18.10 -23.91 clear 06/19/02 <200 <2,0 <2.0 <2.0 <2.0 580 no no no no no na no no 43.88 -25.78 clear 09/16/02 <100 <1.0 <1.0 0.0 <1.0 330 <1.0 <1.0 41.0 37 <100 <10 <1.0 <1.0 49.12 31.02 cloudy 12J26/02 <200 <2.0 <2.0 <2.0 <2,0 930 no no no no no me no no 46.22 -28.12 cloudy 03126/03 180 <1.0 <1.0 <11.0 <1.0 660 no no no na no no no no 43.93 -25,83 clear 06/27/03 <200 <1.5 <1.5 0.5 <1,5 750 <1.5 <11.5 <1.5 46 <200 <20 <1,5 no 45.91 -27.81 clear 09/19/03 260 16 41.5 23 e1.5 670 no no no no no no no no 52.75 34.65 clear 12/30/03 <100 <1.0 <1.0 411.0 41.0 430 no no no no no no no na 48.55 -30.45 clear 03126104 <50 <0.50 <0.50 <0.50 <0.50 330 .40.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 no 46.05 -27.95 clear 7!04 <50 <0.50 <0.50 4.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 na 50.08 -31.90 clear 09/09/04 no ns ns ns ns ns AS ns ns ns ns ns ns ns; dry dry dry 12116/04 <50 <0.50 <0.50 <0.50 <0.50 500 na no na na no no na na 52.15 34.05 clear Pmjact N.,I SA11.47 Page 5 of 9 HORIZON ENVIRONMENTAL INC.