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TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No.12474 3440 East Main Street,Stockton,California ethyl- total Depth to TOC GW Well TPI-Ig benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol EIEC EDB GW Elevation Elevation Number Date {u !L► (u ) (ug/L) (u2 ) (ug/L) (ug/L) (ug/L) (uglL) (ug/L) (u L) (u !L) (u !L) (uglL)(u L (feet) (feet mall (feet msl) Comments MW-1 03/31/98 96 <0.50 4050 <O50 <0,50 <5.D na no no no no no no na 62.27 26.29 -39.96 screened 06/10/98 ns ns ns ns ns ns ns ns ns ns ns ns no no 59.59 -33.30 no comment Interval D9108M ns ns ns ns ns no ns ns ns ns ns ns no no 59.68 -33.39 no comment 75'-90' 12!30198 ns ns ns ns ns ns ns ns ns ns ns ns no no 57.70 -31,41 no comment 03125199 <50 <030 <0.50 <0.50 <0.50 40,50 <0.50 <0.50 40.50 45.0 <50 <5.0 no no 55.71 -29.42 no comment 06103/99 <50 <0.50 <0.50 40.50 <0-50 4050 <0.50 <0.50 <D.50 <5.0 <50 45.0 <30 40.50 55.13 -28.84 no comment 08/40199 <50 40.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0,50 57.38 31.09 no comment 12/10/99 450 <0.50 <0.50 <0.50 40.50 40.50 40.50 40.50 40.50 <5.0 <50 45.0 <0.50 <0.50 57.18 30.89 no comment 03/03)00 94 40.50 40.50 40.50 40.50 <0.50 40.50 40.50 40.50 45.0 460 45.0 40.50 40,50 56.22 -29.93 no odorino sheen 0626)00 130 <0.50 <0-50 40.50 <0.50 40.50 40.50 40.50 <0.50 <5.0 450 45.0 40.50 40.50 55.12 -28,83 no odorlm sheen 0928100 240 <0.50 40.50 40.50 40.50 <5.0 no no no no no no no no 57.43 -31.14 no odor/no sheen 12/22100 180 40.50 40.50 40.50 40.50 45,0 no no no no no no no no 56.56 30.27 no odormo sheen 0328101 180 <0.50 1.5 <0.50 1.2 <5.0 no na na na na no na na 55.61 -29.32 no odorino sheen 06/27/01 350 40.50 40.50 40.50 40.50 <0-50 <0.50 40.50 40.50 45.0 450 45.0 40.50 40.50 57.43 -31,14 no odor/no sheen 09106101 520 <0.50 0.68 <0.50 1.2 <5.0 no no na na no no na no 5922 -32,93 no odorino sheen 12103)01 500 <030 <0.50 40.50 40.50 45,0 no no no me no no no no 59.91 -33.62 no odorino sheen 0288102 790 40.50 1.8 40.50 <0.50 <5,0 no no no no no no no no 56.48 -32.19 no odor/no sheen 0520102 670 <0.50 0.64 <0.50 40,50 <0,50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 0.55 <0,50 58.76 28.28 .30.48 no ododno sheen 08/29102 530 <D,5D <0.50 40.50 <0.50 <5,0 no no no no no no no no 61.77 -33.49 no odor/no sheen 12106)02 740 <0.50 40.50 40.50 <0.50 <0.50 no no no no no no no no 69.16 -40.116 no odortno sheen 03107103 910 <0.50 <0.50 <0.50 <0.50 <5.0 no no no no no no no no 61.42 33.14 no odarino sheen 06!13!03 1800 40.50 <0.50 <0.50 40.50 <50 <0.50 <0.50 40.50 <5.0 <50 <5.0 4.9 40.50 60.14 -31.86 no odor/no sheen 0628103 ns ns ns ns ns no ns ns ns ns ns no ns ns nm nm not sampled 11/25M no ns no ns ns no ns ITS ns ns ns ns ns ns 63.02 -34.74 not sampled 03101)04 770 40.50 40.50 <0.50 <0.50 <0,50 <0.50 <0.50 <0.50 45.0 450 <5.0 40.50 <0,50 61.62 -33.34 no odor/no sheen MW-2 03141/98 5000 1100 86 71 270 <25.D no no no no na no no no 61.45 2542 36.03 screened 06110198 ns ns ns ns no ns ns ns ns ns ns ns no no 58.76 -33.34 no comment Interval 09108196 ns he ns ns ns ns ns ns ns ns ns ns no no 58.82 -33.40 no comment 76'•91,5' 12/30198 ns ns ns ns no ns ns ns ns ns ns ns no no 56,83 -31,41 n0 comment 0325199 1600 130 1.7 1.1 50 0.62 <0.50 40.50 40.50 6.1 <50 25 no no 54,90 .29.48 no comment 06)03199 14000 8300 730 510 2100 <0.50 <0.50 <0.50 <0.50 <5.0 450 <5.0 28 0,72 54.27 -26.85 no comment 08 WI% 42000 8900 5000 1200 5800 0.62 2.0 40.50 <0.50 <5.0 450 45.0 45 40 56,48 -31.06 no comment 12/10199 12000 1900 680 330 1200 .50 45.0 45.0 <5.0 <50 <5D <100 <5,0 <5.0 56.33 -30.91 no comment 03/03MO 5100 1800 33 160 62 <5.0 <5.0 <5.0 45.0 <50 450 <50 <5,0 450 54,91 -29,49 no ododno sheen 06/22100 22000 5900 530 630 1700 8.5 <5.0 <5.0 <5.0 <50 4500 <2DD <5,0 <5.0 54,14 -28.72 slight odorino sheen 09/28/00 16000 4100 am 260 1500 <50 no no no no no no no no 56.55 -31.13 slight odorino sheen 1222100 6100 1200 120 200 330 <50 no no no no no no no no 55,73 -30.31 slight odorino sheen 0328101 31000 7600 610 1000 3300 <200 no no no no no no no no 54.69 -29.27 odor/no sheen 0627101 21000 Sam 570 640 2100 <25 <25 <25 <25 <250 <5000 19W <25 <25 56.48 -31.D6 odorhw sheen 09876/01 9900 2000 500 210 840 4100 no no no no no no no no 58,67 33.25 otlorfno sheen 12104101 28000 6700 1600 910 4000 <250 no no no no no no no no 58,% 33.56 odor/no sheen 03/01/02 57Dm 12000 1200 1400 6100 4500 no no no no no no no no 57,62 -32,20 odor/no sheen 0520102 53000 11000 1500 13W 6200 4+50 450 450 <50 4500 45000 <500 <50 <50 57.91 27.44 -30.47 no odor/no sheen 08/30/02 51000 9900 3200 1300 6100 <500 no no no no no no no no W95 -33.51 ododno sheen 12106/02 29000 6400 580 770 3300 <25 no no no no no no no no 61.08 -33.64 odorino sheen 03107103 43000 1D000 770 1300 4400 <500 no no no no no no no no 60,28 -32.64 odor/no sheen DBM3103 11000 2200 290 310 960 <10 410 <1D 410 <100 <1000 <100 21 410 59.09 -31.65 odorhwsheen 0828103 ns ns ns no ns ns ns ns ns ns ns ns ns ns nm nm not sampled 11125103 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 6228 -34.84 not sampled 03171/04 20000 6100 94 710 1200 <20 <20 <20 420 <200 <20130 <2D0 420 420 60.94 -33.50 odor/no sheen 474gmdO 14i+ Page 1 of 9 HORIZON ENVIR014MENTAL INC. arwrn ria-a+ u