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TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No. 12474 3440 East Main Street,Stockton,California ethyl- total De to TOC GW Well TPHg benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date a 1L u 1L u 1L (u 1L a IL u IL (u 1L u IL u 1L u 1L u 1L u 1L u IL u 1L feet feet msl feet msl Comments MW-1 03!31!98 96 10.50 10.50 10.50 10,50 15.0 na na na na na na na. na screened 06/10198 ns ns ns ns ns ns ns ns ns ns ns ns na na 59.59 26.29 -39.98 Interval 09108!98 ns ns ns ns ns ns ns ns ns ns ns ns na na 59.68 -33.30 no Comment -90' 12130!98 ns ns ns ns ns ns ns ns -33.39 no comment 75' 03!25!99 < ns ns ns ns na na 57.70 -31.41 no comment 50 <O.Sp 10.50 40.50 10.50 10.50 10.50 10.50 10.54 15.0 150 <5A na na 55.71 06103/99 <50 10.50 <0.50 1050 10 50 <0.50 10.50 <a,50 <0.50 <5.0 < -29.42 no comment 08130!99 150 10,50 50 15.0 <0.50 10.50 55.13 -28.64 no comment 0.50 10.50 10.50 10,50 10.50 10.54 10.50 15.0 150 15.0 10.50 10,50 57.36 12!10199 150 10.50 10.50 10.50 10.50 10.50 10.50 10.50 10.50 15.0 150 15.0 10.50 10.50 57.78 31.09 no Comment 03!03100 94 10.50 10.50 <0,50 <OM 10.50 10.50 <0.50 10.50 45.0 <50 15.0 <0.50 10.50 56.22 -30.69 no comment 06/26100 130 <0.50 10.50 <0.50 <0.50 10.50 <0.50 10.50 <0.50 <5.0 <50 <5.0 10.50 <0.50 55.12 -29'93 no Odor/no sheen 09128100 240 <0.50 <D.50 10.50 <0.50 <5.0 na na -28.83 no odor/no sheen 12/22100 080 < a na na na na na 57.43 0.50 <0.50 <D.50 <0.50 15.0 na na na na na -31,14 no odor/no sheen 03128!01 180 10.50 1.5 10.50 1.2 <5.0 na na na 55.56 -39.27 no odor/no sheen 06/27/01 350 c na na na na na na na na 55.61 29.32 no odorino sheen 0.50 10.50 10.50 10,50 S0,50 10.50 10.50 10.50 15.0 150 15.0 10,50 10.50 57.43 09106101 520 10.50 0.68 <0.50 1.2 <5,0 na na na na na na na . 59 22 -31.14 no odorino sheen 12103101 500 <0-50 10.50 10.50 10.50 15.0 na na na na na -32.93 no Odor/no sheen 02!28!02 790 10.50 1.8 10.50 <0.50 < na na na 59.91 -33.62 no Odor/no sheen 05120!02 670 <0.50 1.8 < 5.0 na na na na na na na na 58.48 0.50 <0.50 <0,50 <0.50 <0.50 <0.5D <5,0 < -3219 no odor/no sheen 08129!02 530 < 50 15,0 0.55 10.50 58.76 28.28 -33.48 no odor/no sheen 0.50 10.50 10.50 10.50 45.0 na na na na na na na na 61.77 12106102 740 <0.50 <0,50 10.50 <0.50 <0.50 na na na na na na na na 69.16 -33'49 no odor/no sheen -40.88 no odorino sheen ! MW-2 03131198 5000 1100 86 71 270 <25.0 na na na na na na na na 61.45 25.42 36.03 �P screened 06110!98 ns ns ns ns ns ns ns ns ns ns ns ns na na 58.76 !� Interval 09!08198 ns ns ns ns ns ns ns ns ns ns ns ns na na 58.82 33.34 no comm-nt 1 76'-91,5' 12130/98 ns ns ns ns ns ns ns ns 33.40 no comment 03!25199 1600 130 n5 ns ns ns na na 56.63 31.41 no Comment 1.7 1.1 50 0,62 <0.50 10.50 <0.50 6.1 <50 25 na na 54.90 06103/99 14000 8300 730 510 2100 19.50 10.50 <0.50 <0.50 15.0 < -2948 no comment 08!30199 42000 8900 5000 50 <5.0 28 0 0 54.27 -26.85 no comment 1200 5$00 0.62 2.0 10.50 10.50 15.0 450 15.0 45 40 56.48 12/10199 12000 1900 680 330 1200 <5.0 15.0 <5,0 <5.0 150 < -30.06 no comment 03103100 5100 1800 33 160 62 15.0 15 0 50 c100 <5.0 Jr:O 56.33 -30.91 no comment . 15.0 15.0 150 150 150 15.0 15.0 54.91 -29.49 no Odor/no sheen 06/22100 22000 5900 53G 630 1700 8.5 15.0 <5.0 <5.0 150 <500 <200 45.0 15.0 5 09/28/00 16900 4100 800 260 1500 150 na na na na na nna na 5 6.55 -28.72 slight odorino sheen o 5.55 -31.13 slight odorino sheen 12!22100 6100 1200 120 200 330 459 na na na na na na na na 55.73 -30.31 slight odor/no sheen 03128/01 31000 7600 610 1000 3300 1200 rte na na na na na na na 54.69 06127!01 21000 5800 570 640 2100 125 <25 <25 <25 <250 <5000 1900 <25 < -29.27 odorino sheen 09/06101 8900 2000 500 210 840 <100 na na na na na na na a5 58.67 -31'06 odor/no sheen 12104!01 28000 6700 1600 910 4000 <250 na na na na na no na na 58.98 -33.25 odor/no sheen 03!01102 57000 12000 1200 1400 6100 <500 na na na na na na na na 57.62 -32.2odor/no sheen -33.56 odorino sheen 05120/02 53000 11000 1500 1300 6200 150 <50 150 <50 <500 <5000 <500 <50 <50 57.91 27.44 -30,47 no odor/no sheen 08130/02 51000 9900 3209 1300 6100 4500 na na na na na 111 na na na 61 08 -33.51 odor/no sheen 1210fi102 29000 6401) 560 770 3300 125 na na na na na na na na 61,08 -33.64 odorino sheen I 414gmr00.x1s Pmlect No,1d74 44 Page 1 of 8 z HORIZON EIMRONMENTAL INC.