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Table 3. quality of Coal and Overburden lJaters <br />Sample pH Cond. C1 HCO SO NO Ca Mg Na K CO TDS <br /> No. mmhos/cm 3 4 3 3 mg/1 <br /> @ 25°C /1 <br /> e q <br />DH 61 9.3 1.80 6.3 3.0 15.8 0.26 3.8 2.3 17.8 0.28 0.2 1530 <br />DH 96 7.5 2.00 1.1 5.2 15.3 0.02. 5.4 4.3 10.3 0.10 0 1700* <br />DH 97 7.5 1.40 1.3 4.6 9.2 0.02 4.8 3.6 7.0 0.13 0 1200* <br />DH 117 6.6 7.95 13.R 15.4 73.5 0.02 Z0.0 10.3 66.1 0.36 0 .7030 <br />DH 122 7.5 1.80 1.0 5.8 12.1 0.04 6.3 3.9 9.2 0.10 0 1500* <br />DH 137 8.4 4.82 12.8 3.2 44.6 0.03. 6.8 2.9 40.3. 0.41 0 3910. <br />DH 172 6.6 7.55 5.0 19.4 75.8 0.03 19.6 16.8 60.4 0.74 0 7020 <br />Sample Fe Cu Zn Pb 111 Cd Cr B <br />No. /1 <br /> q <br />DH 61 12 7 <5 <50 <10 <5 <5 180 <br />DH 96 47 <5 39 <50 :<5 <5 9 <br />DIi 97 83 <5 62 <50 <5 <5 <5 <br />DH 117 2,210 21 142 <50 28 <5 17 297 <br />DH 122 290 <5 12 <50 c5 <5 <5 <br />Dli 137 65 11 138 <50 <10 <5 1 126 <br />DII 172 351 27 660 70 44 <5 28 1 ,010 <br />*Estimated from measured EC. <br />• <br />,.,~ t <br />. I 1.{ • I .. I • - <br />W <br />N <br />