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<br />• <br />• <br />Table 7 Quality of Water Ruuoff adjacent to the Reface file at the West Elk Mine duriug the 1993 <br />Water Year <br /> pH Conductivity TDS= Total Fe' <br />Location Date (units) (µmhos/cm) (mg/L) (mg/L) <br />MB-6 Pond Grab 05/02/93 8.3 l37 978 0.96 <br />MB-6 Pond Grab 06/09/93 7.7' 160' 1050 1.49 <br />MB-6 Pond Grab 09/07/93 7.7' 600' 4l0 121 <br />No[e: <br />' Field measurements <br />' Total Suspended Solids <br />Z Total Dissolved Solids <br />' Fe =Iron <br />The sediment ponds are treated with cationic <br />flocculent when necessary to speed clarifica- <br />tion and settling of suspended solids. The <br />ponds MB-1, MB-2, MB-5, and MB-6 <br />have manually controlled dewatering devic- <br />es. Ponds MB-3 and MB-4 have automatic <br />dewatering capability. Ponds MB-1, MB-2, <br />MB-5 and MB-6 are dewatered intermittent- <br />ly with most discharges coming during early <br />spring runoff. Pond MB-5 is responsive to <br />a high spring groundwater table and some- <br />times has to be dewatered more often. <br />Dewatering procedures take usually less than <br />one day for all ponds except MB-5. <br />Refuse Pile Water Quality <br />Water monitoring adjacent to the Lower <br />Refuse Pile consists of the monitoring of <br />alluvial wells around the refuse pile and <br />periodic sampling of discharges from MB-6 <br />(Table 7). This pond treats surface water <br />runoff from the refuse pile and adjacent <br />disturbed areas and any discharge from the <br />underdrain. <br />Flowmeters are installed on discharge points <br />from sediment ponds which discharge inter- <br />mittently to continuously record flows. <br />Information on flows, sampling points, and <br />quality of water discharged from the mine <br />site sediment ponds during WY 1993 is <br />included in Appendix J. The quality of <br />water discharged was monitored. Quality <br />data is presented in Table 7. <br />10 <br />