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TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No. 3641 1210 E. Hammer Lane, Stockton, California ethyl- Depth to TOC GW Well TPHg benzene toluene benzene xylenes MTBE DIPE ETBE TAME: TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date (ug/1) u /I (u 11 u ll (u 11 (ug/1) u 11 (ug/1) (ug/1) (ug/1) u 1I) (ug/1) u li u /1 u !I feet feet msl feet ms]) Comments MW-5 1012197 87000 21000 10000 2000 10000 3800 <5.0 <5.0 <5.0 <500 <50000 <10000 na na 57.33 99.58 42.25 no sheen, no odor screened 3139198 10000 2100 1500 270 710 530 na na na na na na na na 49.19 50.39 no sheen, odor interval 6110198 3100 510 470 45 310 180 na na na na na na na na 46.22 53.36 no sheen, odor 50'-75' 918198 24000 6500 1000 920 1400 4500 <2.5 <2.5 3.4 48 3600 <25 na na 49.55 50.03 no sheen, odor 12/30/98 340 32 <2.5 2.9 <2.5 980 na na na na na na na na 44.10 55.48 no sheen, odor 3125199 540 100 1.8 12 3.6 280 <10 <10 <10 <100 <50 <5.0 na na 41.47 58.11 odor!no sheen, 612199 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!no sheen, 8131199 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 1219199 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 311100 <500 21 <5.0 <5.0 <5.0 4500 <5.0 <5,0 <5.0 72 <500 <50 na na 42.51 57.07 no comment 6/6/00 3400 800 74 240 120 3900 <5.0 <5.0 <5.0 180 <500 <50 <5.0 <5.0 42.15 57.43 clear 9114100 15000 1300 880 1100 1100 2600 <5.0 <5.0 <5.0 180 <700 <50 <5.0 <5.0 48.18 51.40 clear 12/12100 <500 42 7.9 12 20 3200 na na na na na na na na 43.87 55.71 clear 3119101 <200 8.1 <2.0 <2.0 <2.0 1900 na na na na na na na na 41.45 58.13 clear 6119101 9300 1700 500 420 690 5600 na na na na na na na na 45.31 54.27 clear 9127101 5100 230 170 450 460 1100 na na na na na na na na 50.24 49.34 sheen 12/13/01 620 32 5.3 19 23 1900 na na na na na na na na 46.49 53.09 sheen 3128102 350 36 <2.5 9.7 24 1600 na na na na na na na na 43.17 19.49 -23.68 no comment 6119102 7000 1300 410 360 510 3100 na na na na na na na na 45.85 -26.36 no comment 9116102 8`100 490 170 490 960 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 na na na na na na na na 47.46 -27.97 clear 3126103 370 14 5.0 <2.5 11 1400 na na na na na na na na 45.16 -25.67 clear 6127103 10000 1600 480 420 640 6300 <10 <10 <10 <100 <1000 <100 <10 na 47.91 -28.42 clear 9/19103 6300 810 59 320 580 4100 na na na na na na na na 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 3126104 <250 <2.5 <2.5 <2.5 <2.5 1700 <2.5 <2.5 <2.5 30J <250 <25 <2.5 na 47.45 -27.96 no comment 6117104 ns ns ns ns ns ns ns ns ns ns. ns ns ns ns 51.88 -32.39 not sampled 919104 9000 1500 540 240 640 5100 <10 <10 <10 150 J. <1000 <100 <10 na 56.86 -37.37 clear 12/16/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 53.06 -33.57 not sampled 313105 <200 14 <1.5 1.6 13 2000 <1.5 <1.5 1.5 25J <800 <20 <1.5 na 49.72 -30.23 clear 6116105 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 49.43 -29.94 not sampled 641gmr xls r - ..,• F••, Project No.4 ' 8 Pageds 13 HORIZON ENVIRONMENZ, ZINC.