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tifaunrain Coal Company 2000 Annual Hydrology Report We.a Elk Mine <br />• <br />Table 9 <br />Sedimentation Ponds Numeric Discharge Limits <br /> Sedimentation Ponds <br />Parameter and Time Period Dischar a Limit <br />Total suspended solids (mg/L) <br />• 30-day avera¢e 35 <br />• 7-day average N/A <br />• Maximum 70 <br />Total dissolved solids (mg/L) <br />• 30-day average N/A <br />• 7-day average N/A <br />• Maximum Report <br />Oil and grease <br />• 30-day average No sheen <br />• 7-day average No sheen <br />• Maximum No sheen <br />Total iron (mg/L) <br />• 30-day average 3.5 <br />• 7-day average N/A <br />• Maximum 7.0 <br />pH (standard units) <br />• 30-day average 6.5-9.0 <br />• 7-day average 6.5-9.0 <br />• Maximum 6.5-9.0 <br />• 'No visual sheen should be present. If sheen is present, total concentration <br />cannot exceed 10 mg/L. <br />Mine Water Inflows <br /> <br />While mine inflows continued during WY00, the volume of the inflows was significantly lower <br />and no new large inflows were encountered. Flow continued from the B East Mains (BEM) fault <br />and the 14 Southeast Headgate (14SEHG) fault, although flows from both faults diminished and <br />relocated as mining progressed downdip along the faults. MCC also experienced the usual small <br />inflows, which quickly subsided, as development mining occurred. Total mine inflows were <br />estimated at 100 gpm during WY00. <br />As is typical, MCC encountered small inflows during development mining with continuous <br />miners. Initial inflows ranged from less than 0.05 gpm to I S gpm, and then decreased to drips, <br />or dried entirely. The locations of all inflows are shown on Map 1. <br />NW Panels Sealed Sump <br />During WY00, MCC continued to utilize the NW Panels sealed sump, which is the area that was <br />created by mining the INW through 7NW longwall panels, and shown on Map 1. The use of this <br />sump allowed MCC to become more efficient in handling mine inflows, and to ensure that water <br />is discharged in compliance with MCC's CDPS discharge permit. Until June 2000, MCC routed <br />most of the mine inflow water to the NW Panels sealed sump and discharged via the Lone Pine <br />Pipeline to the North Fork. <br />831-0.31.550 Page 19 Wright WarerEngineers <br />