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• 0 TABLE i GROUNDWATER MONITORING DATA Beacon Station No.12474 3440 East Main Street,Stockton,Califorrlia ethyl- total Depth to TOC GW Well TPHg benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date (uglL) (uglL) (ug1L) (uglL) (uglL) (uglL) (uglL) (ug1L) (ug1L) (ug1L) jug/L) (ug/[-) (ug/L) ug1L (feet) {feet msl) Meet msl) Comments MW-1 03/31/98 96 <0150 <0.50 <0.50 <0.50 <5.0 na na na na na na 6227 26.29 -39.96 screened 06110/98 ns ns ns ns ns ns ns ns ns ns ns ns 59.59 -3330 no comment interval 0910x/98 ns ns ns ns ns ns ns ns ns ns ns ns 5958 -33.39 no comment 75'•90' 12130M ns ns ns ns ns ns ns ns ns ns ns ns 57.70 •31.41 no comment 03/25/99 <50 <0.50 <0.50 <0,50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 55.71 -29.42 no comment 06103199 <50 <0.50 <0.50 <0.50 <0,50 <0.50 <0.50 <O50 <0.50 <5.0 <50 <5.0 <0.50 <0,50 55.13 -28.64 no comment 08130!99 <50 <0.50 <0.50 <0,50 <0.50 <050 <0.50 <0,50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 57,38 -31.09 no comment 12!10199 <50 <0.50 <0,50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5-0 .50 4.0 <0.50 <0.50 57.18 -30-89 no comment 03/03/00 94 <0,50 <0.50 <0.50 <0.50 <0.50 <0.50 <0,50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 56.22 -29.93 no ododno sheen 06126!00 130 <0,50 <0.50 <0.50 <0.50 <0,50 <0.50 <0.50 <0.5o <5.0 <50 <5,0 <0.50 <0.50 5512 -28.83 no odor/no sheen 09/28100 240 <0.50 <0.50 <0.50 <0,50 <5.0 na na na na na na na na 57A3 -31.14 no odorino sheen 12/22/00 180 <0.50 50.50 <0.50 <0.50 <5.0 na na na na na na na na 56.56 -30.27 no odortno sheen 03/28101 180 <0,50 1.5 <0.50 1.2 <5.0 na na na na na na na na 55.61 -2932 no odor/no sheen 06/27101 350 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0,50 <0.50 <5.0 <50 <5,0 <0.50 <0.50 57.43 -31.14 no odor/no sheen 09106/01 520 <0.50 0.68 <0.50 1.2 <5.0 na na na na na na na na 59.22 -32.93 no odortno sheen 12/03/01 500 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na na na 59.91 -33.62 no odor/no sheen 02!28102 790 <0.50 1.8 <0.50 <0.50 <5.0 ne na na na na na na na 58.48 32.19 no ododno sheen MW-2 03/31/98 5000 1100 86 71 270 <25.0 na na na na na na 61,45 25.42 -36,03 screened 06110!98 ns ns ns ns ns ns ns ns ns ns ns ns 56.76 33.34 no comment interval 09/08/98 ns ns ns ns ns ns ns ns ns ns ns ns 58.82 -33.40 no comment 76'-91.5' 12!30!98 ns ns ns ns ns ns ns ns ns ns ns ns 56,83 -31.41 nocommenl 03/15/99 1600 130 17 1.1 50 0,62 <0.50 <0.50 <0.50 6,1 <60 25 54,90 -29,46 no comment 06/03/99 14000 8300 730 510 2100 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 28 0.72 54,27 -28.85 no comment 08/30/99 42000 8900 5000 1200 5800 0,62 2.0 <0.50 <0.50 <5.0 <50 <5.0 45 40 56.48 -3106 nocommenl 12110!99 12000 1900 680 330 1200 <5.0 <50 <5.0 <5.a <50 <50 <100 <5.0 <5.0 56,33 •30,91 no comment 03/03/00 5100 1800 33 160 62 <5.0 <5.0 <5.0 <5.0 .50 .50 <50 6.0 <5,0 54,91 -29.49 no odortno sheen 06/22/00 22000 5900 530 630 1700 8.5 <5,0 <5.0 <5,0 <50 <500 <200 <5.0 <5,0 54.14 -28,72 slight ododno sheen 09/28100 16000 4100 aoo 260 1500 <50 na no na na na na na na 56.55 -31.13 slight odortno sheen 12/22/00 6100 1200 120 200 330 <50 na na na na na na na na 55.73 -30.31 slight odor/no sheen 03128101 31000 7600 610 1000 3300 <200 na na na na na na na na 5469 -2927 odor/no sheen 06/27/01 21000 5800 570 640 2100 <25 <25 <25 <25 <250 <5000 1900 <25 <25 56.48 -31.06 odor/no sheen 09/06/01 8900 2000 500 210 840 <100 na na na na na na na na 58.67 -33.25 cdorhw sheen 12/04101 28000 6700 1600 910 4000 <250 na na na na na na na na 58.98 -33.56 adodnosheen 03101102 57000 12000 1200 1400 6100 <500 na no na na na na na na 57.62 32.20 odortno sheen 474amoo.a Page 1 of 7 HORIZON BPVIRONKBNTAL IPC. Project No.1474.44