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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) (ug/1) (U911) (ug/1) (ug/1) (ug/1) (ug/1) (ug/1) (ug/1) (ug/1) (ug/1) (ug/l (ug/1) (u11)( feet (feet msl)(feet msl) Comments MW-1 11/14/96 14000 4400 1200 510 1300 1200 na na na na na na na na 57.02 99.53 42.51 sheen screened 3/18197 1900 220 17 <1.3 13 270 na na na na na na na na 51.25 48.28 none interval 3/31196 370 28 29 5.2 15 95 na na na na na na na na 49.09 50.44 no sheen, no odor 60'-80' 6110198 <50 <0.50 <0.50 <0.50 <0.50 29 na na na na na na na na 46.06 53.47 no sheen, no odor 916198 840 190 73 <5.0 130 1100 <0.50 <0.50 0.81 20 2200 <5.0 na na 49.55 49.98 no sheen, odor 12/30/98 <50 0.96 <0.50 <0.50 <0.50 65 na na na na na na na na 44.03 55.50 no sheen, odor 3125199 80 <0.50 <0.50 <0.50 <0.50 68 <0.50 <0.50 <0.50 5.6 <50 <5.0 na na 41.41 58.12 odor/no sheen, 612199 60 <0.50 <0.50 <0.50 <0.50 45 <1.0 <1.0 <1.0 <10 <50 <10 <1.0 <1.0 42.50 57.03 odor l no sheen, 8131199 1500 82 3.6 54 3 3400 <0.50 <0.50 1.3 140 <500 <5.0 <0.50 <0.50 48.10 51.43 no comment 12/9199 69 1.2 2.5 <0.50 2.4 640 <0.50 <0.50 <0.50 6.4 <50 <5.0 <0.50 <0.50 44.86 54.67 no comment 311100 <200 <2.0 <2.0 <2.0 <2.0 1000 <2.0 <2.0 <2.0 <20 <300 <20 na na 42.45 57.08 no comment 616100 <100 <1.0 <1.0 0.0 <1.0 490 <1.0 <1.0 <1.0 29 <300 <10 <1.0 <1.0 42.14 57.39 clear 9114100 170 14 <1.0 2.1 <1.0 2000 <1.0 <1.0 <1.0 59 <1000 <10 <1.0 <1.0 48.15 51.36 clear 12112100 <50 <0.50 <0.50 <0.50 <0.50 2.0 na na na na na na na na 43.85 55.68 clear 3119101 <50 <0.50 <0.50 <0.50 <0.50 3.9 na na na na na na na na 41.41 58.12 clear 6119101 <50 <0.50 <0.50 <0.50 <0.50 1.6 na na na na na na na na 45.45 54.08 clear 9127101 <50 <0.50 <0.50 <0.50 0.60 51 na na na na na na na na 50.18 49.35 clear 12/13/01 <50 <0.50 <0.50 <0.50 <0.50 270 na na na na na na na na 46.41 53.12 clear 3128102 52 <0.50 <0.50 <0.50 <0.50 360 na na na na na na na na 43.11 19.47 -23.64 clear 6119/02 <50 <0.50 <0.50 <0.50 <0.50 410 na na na na na na na na 45.95 -26.48 clear 9116102 <200 0.96 <0.50 <0.50 1.1 630 <0.50 <0.50 <0.50 17 <50 <5.0 <0.50 <0.50 51.01 -31.54 clear 12/26/02 <50 <0.50 <0.50 <0.50 <0.50 220 na na na na na na na na 47.36 -27.89 clear 3126103 <50 1.8 2.7 <0.50 2.1 280 na na na na na na na na 45.10 -25.63 clear 6127/03 170 34 20 1.8 11 160 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 na 48.10 -28.63 clear 9119103 <50 1.0 0.91 <0.50 0.68 800 na na na na na na na na 54.42 -34.95 clear 12/30/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 49.49 -30.02 clear 3126104 <50 <0.50 <0.50 <0.50 <0.50 110 <0.50 <0,50 <0.50 <5.0 <50 <5.0 <0.50 na 47.41 -27.94 clear 6117/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 52.15 -32.68 not sampled 919104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 57.12 -37.65 not sampled 12/16/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 52.64 -33.37 not sampled 313105 <50 <0.50 <0.50 <0.50 <0.50 96 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 na 49.68 -30.21 clear 6/16105 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 49.60 -30.13 not sampled 641 gmr.xi Project Nd 48 Page;4 J 13 HORIZON ENVIRONMmk: rNc.