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} TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No. 12474 ,r 3444 East Main Street,Stockton,California ethyl- total �� Depth to TOC GW Well TPI4g benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date (ug/L (ug/L u It Lug/Ll u !L (ug/L (ug/L u IL u IL u !L u 1L u 1L u 1L u 1� feet feet msl feet msl Comments ! MW-1 03/31198 96 <0.50 <0.50 <0.50 X0.50 <5.0 no na no no no no no no 62.27 26.29 -39.98 screened 06110/98 ns ns ns ns ns ns ns ns ns ns ns ns no na 59.59 -33.30 no comment interval 09/08/98 ns ns Ins ns ns ns ns ns ns ns ns ns no no 59.68 -33.39 no comment 75'-90' 12130/98 ns_ ns ins ns ns ns ns ns ns ns ns ns no no 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 na no 55.71 -29.42 no comment 06/03/99 <50 <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� 55.13 -28.84 no comment 08/30/99 <50 <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 57.38 -31.09 no comment 12/10/99 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.56. 57.18 -30.89 no comment 03103/00 94 <0.50 <b.50 <0.50 <0.50 <o.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.56 56.22 -29.93 no odor/no sheen 06!26100 130 <0.50 <b.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.5U 55.12 -28.83 no odor Ino sheen 09/28/00 240 <0.50 <0.50 <0.50 <0.50 <5.0 no no na na na na na na 57.43 -31.14 no odor 1 no sheen 12122100 180 <0.50 <b.50 <0.50 <0.50 <5.0 no no na na na no no no 56.56 -30.27 no odor I no sheen 03/28/01 180 <0.50 1.5 <0.50 1.2 <5.0 no na na no no no no nab 55.61 -29.32 no odor 1 no sheen 06/27101 350 <0.50 450 <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 1 no sheen 09/06/01 520 <0.50 0.68 <0.50 1.2 <5.0 no no na no na na no no 59.22 -32.93 no odor/no sheen 12/03/01 500 <0.50 <0.50 <0.50 <0.50 <5.0 na no no na na no no no 59.91 -33.62 no odor I no sheen 02/28102 790 <0.50 1.8 <0.50 <0.50 <5.0 na na no no no no no no 58.48 32.19 no odor I no sheen 05120/02 670 <0.50 0.64 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 0.55 <0.50 58.76 28.28 -30.48 no odor/no sheen 08/29102 530 a <0.50 <0.50 <0.50 <0.50 <5.0 na no no no no no na na 61.77 -33.49 no odor 1 no sheen 12/06/02 740 <0.50 450 <0.50 <0.50 <0.50 no no no na no no no na 69.16 40.88 no odor I no sheen 03/07/03 910 <0.50 450 <0.50 <0.50 <5.0 no na no na na no no no 61.42 -33.14 no odor 1 no sheen 06/03103 1800 <0.50 450 <0.50 <0.50 <5.0 <0.50 <0.50 <0.50 <5.0 <50 <5.0 4.9 <0.50 60.14 -31.66 no odor I no sheen 08/28/03 ns ns lns ns ns ns ns ns ns ns ns ns ns ns nm nm not sampled 11!25103 ns ns ;ns ns ns ns ns ns ns ns ns ns ns ns�� 63.02 34.74 not sampled 03/01/04 770 <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 61.62 26.24 35.38 no odor 1 no sheen 06108/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 62.25 -36.01 not sampled 09/08/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 63.88 37.64 not sampled 12/08104 ns 4, ns ns ns ns ns AS ns ns ns ns ns ns ns 63.94 37.70 not sampled 03!10105 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm not sampled 05/25105 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 61.58 -35.34 not sampled 09/01/05 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 62.42 -36.18 not sampled 12114/05 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 62.58 36.34 not sampled i I I I. i { 474gmr0q Papt 18 HORIZON ENVIROAAL INC. Project No.1474.48