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i+ TAJO GROUNDWATER MONITORING DATA !' Beacon Station No.12474 i' 3440 East Main Street,Stockton,California I , ethyl- total Depth to TQC GW Well TPHg benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date u 2 (ug/L u !L (ug/L (ug/L (ug/L (ug/L (ug/L (ug/L (ug/L u !L u IL (ug/L (ug/L feet feet msl feet msl Comments MW-12 10/26/99 81000 3200 17000 3100 17000 <2.0 <2.0 <2.0 <2.0 <20 <50 46000 <50 66 53.51 25.79 -27.72 no odor 1 no sheen screened 03103/00 70000 2800 13000 2000 11000 59 <50 <50 <50 <500 <0.50 36000 <200 <50 55.63 -29.84 no odor 1 no sheen Interval 06/22/00 87000 2600 14000 2400 13000 <20 <20 <20 <20 <200 <2000 39000 30 <20 54.64 -28.85 no odor/no sheen 84'-89' 09/28/00 68000 7500 3300 2200 7700 <200 na na na na na na na na 56.49 -30.70 slight odorino sheen 12/22/00 27000 756 4700 190 5500 <200 na na na na na na na na 56.32 -30.53 odor lno sheen 03128/01 57000 2460 11000 2100 12000 <200 na na na na na na na na 55.20 -29.41 odor!no sheen 06/27101 93000 5800 15000 2900 16000 <50 <50 <50 <50 <500 <5000 60000 240 <50 56.45 -30.66 odor 1 no sheen 0910"1 80000 7100 9500 2400 13000 <250 na na na na na na na na 58.30 -32.51 odor!no sheen 12104/01 81000 6000 6200 2500 11000 <100 na na na na na na na na 59.16 -33.37 odor 1 no sheen 03101102 69000 5960 5500 2000 9500 <250 na na na na na na na na 58.03 -32.24 odor/no sheen 05/20/02 43000 4700 3700 830 5700 <25 <25 <25 <25 <250 <2500 41000 440 <25 58.29 27.75 -30.54 ' odor l no sheen 08/30/02 38000 4700 3300 860 4500 <200 na na na na na na na na 61.03 -33.28 odor!no sheen 12106/02 27000 3400 2600 220 4300 <20 na na na na na na na na 61.51 -33.76 odor f no sheen 03107/03 54000 6200 4800 940 8400 <250 na na na na na na na na 60.93 -33.18 odor 1 no sheen 06/03/03 28000 2800 2200 57 4400 <10 <10 <10 <10 <100 <1000 <600 <10 <10 59.99 -32.24 odor 1 no sheen 08!29103 76000 4306 3600 2000 10000 <100 na na na na na na na na 61.42 -33.67 no odor/no sheen 11/25/03 ns ns' ns ns ns ns ns ns ns ns ns ns ns ns 62.48 -34.73 not sampled 03101/04 78000 6160 5200 2700 12000 <10 <10 <10 <10 <100 <1000 <200 140 <10 81.23 25.68 -35.55 odor I no sheen 06/08104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 61.56 -35.88 not sampled 09109/04 ns ns, ns ns ns ns ns ns ns ns ns ns ns ns 63.32 -37.64 odor I no sheen 12108/04 ns ns' ns ns ns ns ns ns ns ns ns ns ns ns 63.38 -37.70 not sampled 03111/05 52000 4200 2500 1400 6200 <10 <10 <10 <10 <100 <1000 <400 130 <10 62.25 -36.57 odorlsheen 05/25/05 ns ns' ns ns ns ns ns ns ns ns ns ns ns ns 61.01 35.33 not sampled 09/02/05 47000 2500 1500 1400 5800 <7.0 na na na na na na na na 73.48 -47.80 no odor I no sheen 12/14/05 ns ns L ns ns ns ns ns ns ns ns ns ns ns ns 69.68 -44.00 not sampled I' `r I r i �E i 14 I� I� i Is ! I� 474gmrD5.x1s "act No.1474.46 Page 12 of 18 HORIZON ENVIRONMENTAL Inc.