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14 <br />Well 003-77-58 <br />Constituent Year <br />1993 (mean) Year <br />1979 (mean) Year <br />1993 (mean) <br />Water elevation (M.S.L.) 671 ~ 671 ~ 6707 <br />Calcium (mg/I) 98 56 118 <br />Sodium (mg/l) 1» 189 170 <br />PH 7.75 7.3 7.5 <br />Potassium (mg/1) NA 5 N/A <br />Sulfate (mg/l) 530 439 550 <br />Bicazbonate (mg/I) 483 22~ 520 <br />Total Dissolved Solids (mg/I) 1029 913 1190 <br />Baseline water can be characterized as sodium bicarbonate. Coal mining commonly changes the <br />water quality to acalcium-magnesium-sulfate. Review of the data indicates that down gradient <br />water quality has been slightly impacted by mining, likely a result of the migration down <br />gradient of water now resident in the reclaimed pit. This resident water, or spoil water, <br />accumulates in the reclaimed pit area much like water in a bathtub. It subsequently migrates <br />downdip, through the undisturbed rock layers. Spoil water quality at Energy Mine No. 3 is <br />represented by wells 008-SP-4B and 008-SP-SA, denoted in the following table. <br />Colorado Yampa Coal Company: Mine No. 3. SL02 Findings 6/99 a:\COSi06?\SLO?Ind.doc <br />