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TABLE I GROUNDWATER MONITORING DATA Beacon Station No.12474 3440 East Main Street,Stockton,California ethyl- total Depth to TOG GW Well TPNg benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date (uglL) (uglL) (ug1L) (ug1L) (ug1L) (ug1L) (uglL) (uglL) (ug1L) (uglL) (ug1L) (uglL) (uglL)(ug1L (feet) (feet msl) (feet msl) Comments MW-4 03131198 96 1050 10.50 10,50 10.50 .5,0 na na na na na na na na 62.27 26.29 -39.98 screened D6110198 ns ns ns ns ns ns ns ns ns ns ns ns na na 59.59 -33.30 nom n' interval 09/08!98 ns ns ns ns ns ns ns ns ns ns ns ns na na 59,68 -33.39 no comment 76'-90' 12730!98 ns ns ns ns ns ns ns ns ns ns ns ns no na 57.70 -3141 no comment - 03125M 150 10.50 10.50 '0.50 10.50 10,50 10.50 10.50 10.50 15.0 150 <5.0 no na 55.71 -29.42 nocomment 06!03/99 '50 50.50 10.50 10.50 10,50 10.50 -D.50 <0.50 <0.50 15.0 150 15.0 <0.50 <0.50 55.13 -28.64 no comment 08!30199 150 10.50 10.50 10.50 <0.50 10.50 <0.50 10.50 10,50 15.0 <50 <5.0 <0.50 <0.50 57.38 -31.09 no comment 12!10799 150 10.50 <0,50 10,50 .O.50 <0.50 10.50 10.50 1050 15,0 <50 <5.0 <0.50 <0,50 57.18 -30.89 no comment 03103/00 94 10.50 <O 50 10,50 10.50 10,50 .0.50 10.50 10.50 15,0 150 15.0 10,50 <0.50 56.22 -29,93 no ododno sheen 0626108 130 10.50 10.50 <O.Sp 10.50 10.50 10.50 10.50 10.50 <50 <50 <5.0 <050 10.50 55.12 -28.83 no Ddrino sheen 0928100 240 <0,50 10.50 10,50 <0.50 <5.0 na na no na na na na na 57.43 -31.14 noodoorinosheen 1222100 180 10.50 10.50 10.50 10.50 15.0 na na na na no na na no 56,56 -30.27 no odorino sheen 03128!01 180 10.50 1.5 10.50 1.2 15.0 na na na na na no na no 55.61 -29.32 no odorino sheen 9627101 350 <am 1D.50 10.50 <050 - <0.50 <050 10.50 10.50 -5D 150 <5.0 <0.50 10.50 57.43 -3114 no ododna sheen 09/06/01 520 10.50 0.66 '0.50 1.2 15.0 na no na na no na na na 59.22 -32,93 no odor/no sheen 121D3101 500 10.50 <050 10.50 <0.50 <5,0 na no na no na no na na 59.91 -33.62 no odorino sheen 0228102 790 <0.5p 1.8 10.50 <0.50 15.0 na na na na na na na na 58,48 -32.19 no odorino sheen 0520102 670 <0,50 0.64 <050 <0.50 10.50 10.50 <0.50 <0.50 <5.0 <50 15.0 0.55 10.50 58.76 28.28 -30.48 no ododno sheen 17829/72 530 10.50 .0.50 10.50 10.50 15.0 na na na na na na no na 61.77 -33.49 no odorino sheen 12106102 740 <0.50 <0.50 <0.50 <0,50 <0,50 na na na na na na no na 69.16 -40,88 noodorinosheen 03/07103 910 <0.50 <0.50 10.50 10.50 15,17 no na na na na na na na 61.42 -33.14 noodorinosheen C6103103 1800 <0.50 10.50 10.50 <0.50 <5,0 10.50 .6.50 <0.50 <5,0 150 '5.0 4.9 10.50 60.14 -31.86 noodorinosheen 0828103 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm not sampled MW-2 03131!98 5000 1100 86 71 270 125.0 na na na na na na na na 61.45 25.42 -36,03 screened 0611D198 ns ns ns ns ns ns ns ns ns ns ns ns na na 58.76 -33.34 no comment Interval 09/00198 ns ns ns ns ns ns ns ns ns ns ns ns na na 58.62 -33.40 no comment 76'-91,5' 12/30198 ns ns ns ns ns ns ns ns ns ns ns ns na na 56,83 -31.41 no comment 0325199 1600 130 1.7 1.1 5o 0.62 <0.50 14.50 10.50 6.1 150 25 na na:_ . 54,90 --29.48 - no comment ' 06/03199 `.14000' 8900' 730 510 2100 10.50 10.50 <0.50 <0.50 .5,0 150 4.D 28 0.72 54.27 -28.85 no comment 08130/99 42000 8900 5000 1200 5800 0.62 2.0 10.50 <0.50 15,0 150 <5.0 45 40 56.48 -31.06 - no comment 12/10199 120DO 1900 680 330 1200 15.0 15.0 15.0 <5.0 150 150 <1D6 15.0 15.0 56.33 -30.91 no comment 03103100 5100 18GO 33 160 62 15.0 15.0 15.0 -5.0 150 <50 <50 15.0 -5.D 54.91 -29.49 no odor/no sheen 0622100 220W 5900 530 630 1700 8.5 15.0 <5,0 <5.0 150 <500 1200 <5.0 15,0 54,14 -28,72 skght odor/no sheen 09178100 16000 4100 8DO 260 1500 .50 no na na na na na no no 5655 -31.13 slight odorino sheen 1222100 6100 1200 120 200 330 <50 na na na na na na na na 5573 -30.31 slight odor/no sheen 03118/01 31000 7600 610 1000 3300 1200 na na na na na na na na 54.69 -29.27 ododna sheen 0627101 21000 5800 570 640 2100 25 <25 <25 125 <250 -5000 1900 125 125 56.48 -31.06 odor/no sheen 09106!01 8900 2000 506 210 840 <100 no na na no na no na na 58.67 -33.25 odorino sheen 12104/01 28D00 6700 1600 910 4000 1250 na na no na na no na na 58.98 -33.56 odorino sheen 03101102 57000 12000 1200 1400 6100 1500 na na na na na na na na 57,62 -32,20 odor/no sheen 0520!02 53000 11000 1500 13DD 6200 150 150 150 150 1500 15000 1500 150 150 57.91 2744 -3047 no ododna sheen 08!30102 51000 9900 3200 1300 6100 <50D na no na na na na na no 60.95 -33.51 odorino sheen 12106102 29WO 6400 580 770 3300 125 nano na na na na no na 61.08 -33.64 odor/no sheen 03107103 43OW 10000 770 1300 4400 1500 na no na na na na no na 60.28 -32.84 odorino sheen 067D3/03 11000 2200 290 310 960 '10 <10 <10 110 <100 -1000 1100 21 110 59.09 -31.65 odorino sheen 0628103 ns ns ns ns ns ns - ns ns ns ns ns ns ns ns nm nm not sampled 474gm,00.xis Pf%ta No 1474 44 Page 1 of 8 HORIZON EMVIRONMENTAL INC.