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areas of hounds tongue and whitetop. Control areas were sprayed in August and September. A spot <br />• spray gun was used to concentrate control activities on target areas, reducing potential impacts to <br />adjacent desirable vegetation. The herbicide mix, based on recommendations from the Colorado State <br />Extension Service, was mixed and applied by a certified commercial applicator. The weed control <br />areas will continue to be monitored in 2010 for effectiveness and necessary retreatment. See attached <br />2010 Weed Control (daily) Log and the 2010 Weed Spray Location map for a detailed description and <br />location of the 2010 herbicide application. <br />• Grazing <br />Sheep (455 yearling ewes) were moved on to the Yoast Reclaim for 44 days between August 11t and <br />September 141h. This grazing scheme resulted in a total of 136.5 AUMs for 2010. <br />Assumptions: <br />Five (5) sheep = 1.0 AUM <br />One (1) AUM requires 810 lbs. of forage <br />45 days (x) 455/5 animal units = 4095 animal days (/) 30 days = 136.5 animal months (x) 1.0 = <br />136.5 AUMs <br />1,800 lbs/acre (x) 798 acres = 1,436,400 lbs of forage available <br />810 lbs (x) 136.5 AUMs = 110,565 lbs of forage required <br />Therefore; <br />• 110,565(/) 1436,400 (x) 100 = 8.0 % utilization of the entire Yoast Reclaim. <br />SEDIMENTATION POND SURVEYS <br />SCC is required by Permit C-82-057 to monitor sedimentation ponds for sediment storage capacities. <br />In accordance with Rule 4.05.6(11)(c), SCC visually inspects each pond a minimum of quarterly each <br />year. During these inspections, any drastic change in sedimentation storage or sudden increase in a <br />sediment delta at the inlet to the pond could be detected which would require mitigation. <br />Based on the 2010 survey, all sediment ponds have sufficient sediment storage. Additionally, all <br />ponds have been discharging in compliance with the approved NPDES permit effluent limitations. <br />Yearly sediment delivery estimates to the ponds are considerably less than originally calculated, since <br />significant portions of these watersheds have now been revegetated. <br />The results of the annual survey are shown on Table 10.6, Sediment Pond Capacities. <br />STOCK TANKS <br />No stock tanks were constructed in 2010. <br />WILDLIFE MONITORING <br />Seneca Coal Company contracted ICF International (formerly Jones and Stokes) to conduct wildlife <br />monitoring at the Seneca Yoast mine. The work included: <br />• 1. Monitoring known Sharp-tailed and Sage grouse leks and checking for new ones (April 26-28, <br />2010)