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<br />• <br />• <br />Sedimemetion Pond Surveve <br />SCC ie required by Permit C$0-005 to monitor sedirmntetion ponds for sediment stooge capacities. N TR-15, CDMG approved the <br />following frequeny schedule to conduct sediment mrveys for the ponds et Senate D Mine. <br />Sedimereation Pond Frequency Next Scheduled Survey <br />002 Once Every 5 Years 2001 <br />003 Once 8very 5 Years 2001 <br />004 Once Every 2 Years 2002 <br />008 Once Every 2 Yeere 2002 <br />This schedule provides a sediment yield history end gives advance warning m apereGom per®nrcl when sediment cleertwt woh is <br />inquired. In eccordarce with Rule 4.05.6(1 I)(c), SCC visually irupatn each pond a minimum of quarterly each year. During these <br />ioapectiaau, e>ry drastic change in sedimewtion storage ar euddeo increesa io a sediment delis et the inlet to the pond could tr <br />daected which would require mitigation. No rcdimeN cleurod wort was conducted during 2000 for the sedimenution ponds et <br />Sepsis 0 Mine. Sedimem Ponds 002, 003, 004, and 008 were surveyed N July 1993 for aedimem de[emrination. Ae stated in the <br />pert, ponds containing water ere very difficdt to survey end obteio a high degree of eccurecy. fn 1993, Sercce adopted a rant/ <br />approach to sediment surveys. The[ ie, corcenireling the errvey slide in ao arts where the most sediment deposition is litely to <br />occur. <br />Based on the 1993 survey, sll sedimw ponds hove suf(Icieol sedimem storage. Additionally, ell pmde hove been discharging in <br />cotttplierce with the approved NPDES pertnil et-uent limitations. YmAy sediment delivery estimates to the ponds are comiderebly <br />less then origimlly calculated, especially since the majority of the areas in these wetersheda have mw ban reclaimed end <br />revegelaled. <br />The following date shows the latest calculated enmrel sediment delivery end existing rapacity. <br />Pond <br />002 <br />003 <br />004 <br />1108 <br />Year Surveyed <br />1993 <br />1993 <br />1993 <br />1993 <br />Sedimem Survey Results <br />Capacity (ac-ft) <br />186.26 <br />5.06 <br />8.28 <br />6.99 <br />Ave. Yearly Sedirrcnt (ac-ft <br />0.15 <br />0.007 <br />0.12 <br />0.05 <br />5 <br />