2008-03-12_REPORT - C1980005 - Laserfiche WebLink

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C~ CJ • • Grazing Cattle (405 long yearlings) were moved on to the Seneca II reclaimed area between July 23rd and July 30th. All cattle were moved off the Seneca II Mine area between September 5th and September 12th 2007. See attached 2007 Grazing Plan Map for pasture locations. This grazing scheme resulted in a total of 486 AUM's for 2007. 45 days (x) 405 head = 18,225animal days (/) 30 days = 608 animal months (x) 0.8 AUM/animal = 486 AUM's Total = 486 AUM's Assumptions: 7 longyearling = 0.8 AUM, requiring 648 pounds of forage per month. (One AUM requires 810 pounds of forage). The AUM usage is calculated using the following assumptions: Assumptions: Average production = 2,2191bs./acre Total reclaimed area = 2213 acres One AUM requires 810 lbs. of forage (see 2004 Revegetation Monitoring Keport) 2,219 lbs/acre (x) 2,213 acres = 4,910,647 lbs. of total forage produced 8101bs. of forage (x) 486 AUM's = 393,660 lbs. of forage required; Therefore, 393,660 (/) 4,910,647 (x) 100 = 8.0 % utilization of the total Seneca II reclaimed area CHRONOLOGICAL HISTORY OF REVEGETATION Areas revegetated prior to and in 2007 at the Seneca II Mine are shown on the Seneca II 2007 Annual Reclamation -Seeded map in the exhibits section of this report. SEDIMENTATION POND SURVEYS SCC is required by Permit C-80-005 to monitor sedimentation ponds for sediment storage capacities on varying schedules. Per page 7-333 in the PAP, capacity surveys at Ponds 002 and 003 are required every 5 years and at Ponds 004 and 008 every 2 years. Since all ponds were surveyed in 2006, Ponds 004 and 008 will be again surveyed in 2008, while ponds 002 and 003 will not be resurveyed until 2011. This schedule provides a sediment yield history and gives advance warning to operations personnel when sediment clean-out work is required. In accordance with Rule 4.05.6(11)(c), SCC visually inspects each pond a minimum of quarterly each year. During these inspections, any drastic change in sedimentation storage or sudden increase in a sediment delta at the inlet to the pond would be detected which could require mitigation. Based on the 2006 survey, all sediment ponds have sufficient sediment storage. Additionally, all ponds have been discharging in compliance with the approved NPDES permit effluent limitations. Yearly sediment delivery estimates to the ponds are considerably less than originally calculated, since the areas in these watersheds have now been reclaimed and revegetated.