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• Based on the 1993 survey, all sediment ponds have sufficient sediment storage. <br />Additionally, all ponds have been discharging in compliance with the approved NPDES permit <br />effluent limitations. Yearly sediment delivery estimates to the ponds is considerably less <br />than originally calculated. <br />The following data shows the latest calculated annual sediment delivery and existing <br />capacity. <br />Sediment Survey Res ul [s <br /> Pond 'fear Surveyed Capacity fac-ft) Avq. Yearly Sediment fac-ft) <br /> 002 1993 186.26 0.15 <br /> 003 1993 5.06 0.003 <br /> 004 1993 8.28 0.12 <br /> 008 1993 6.98 0.05 <br /> From the past history o f sediment delivery to all of these ponds there should still be more <br /> than adequate sediment storage available. SCC did survey ponds 004 and OOB in 1997, buc <br />• was unable to locale th e previous survey information. Based on the information provided <br /> above, SCC recommends the next sediment surveys be conducted in 1998 for all four <br /> sedimentation ponds and a complete evaluation can then be conducted. <br />SCC is required by Permit C-RO-005, Volume 12, Tab 13, Appendix 13-9 (from TR-21) Co <br />provide as-built drawings for all tempo racy stock tanks [ha[ were constructed in the <br />previous year. Two new and several other stock tanks at Seneca II were reconstructed <br />during 1997. The as-built certifications are being prepared at the present time and will <br />be submitted separately Co the Division by May 1. SCC has also initiated an in-house <br />program [o detecmine which ponds are functioning as designed, or functioning as <br />anticipated. Review of the data collected by the SCC hydrologist and field inspections <br />will help determine which ISf any) stock tanks should be eliminated from the system. Ponds <br />which are completed in 1998 will be cet[ifi etl and the as-bunts will be submitted to the <br />Division. <br />wildlife Monitoring <br />During April 1995, a Columbian Sharp-tailed Grouse lek was discovered on the reclaimed land <br />at Seneca II Mine. Powder River Eagle Studies, a wildlife consulting group, studied the <br />lek for nine days. Between R and 12 males regularly attended and displayed at the site. <br />6 <br />