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Seneca 11 Mine <br />SL -6 Phase 111 Bond Release Request <br />abr — 0.97"f tcatc = <br />Sbr + (0.9 • Sref )_ <br />�Ibr 72 ref <br />_ 976.1— (0.9 * 456.8) _ <br />t`a�` 8.926 <br />808740.49 (0.81 * 39960.01) <br />35 + 31 <br />d — SE G: <br />SEbr + (0.9 SEr, f) 1 <br />tZref - 1 J <br />Sbr (0.9 - Sref� <br />inhere: SE,., _ + <br />YIbr nre f <br />_ r 808740.49 (0.81 * 39960.01)4 — <br />dfsa: — 35 31 _ 29.08 or 30 <br />�161.524 + (0.9 * 35.90)4 <br />35 -1 31 -1 <br />June 2014 <br />Since critical tc = 0.854 (one - tailed, alpha = 0.2, 30 dfs.) and tc .1c (8.926) is greater than this critical <br />value, the hypothesis of less than or equal to 90% of the standard is rejected. Consequently <br />revegetation success for Phase III in BRB -5 relative to the Sagebrush Reference Area is <br />demonstrated. <br />Since the herbaceous production of BRB -5 has been shown to exceed both reference areas via <br />the above hypothesis tests, revegetation success is indicated for herbaceous production in 2012. <br />Woody Plant Density. The criterion for determining success of woody plant density at the Seneca II <br />mine site is as follows: Background average woody density >_ 100 stems per acre with at least 5% of the <br />BRB bond release block possessing >_ 1000 stems per acre of concentrated woody density. Success is <br />evaluated using 90% of the standard values or 90 stems per acre and 900 stems per acre, respectively. <br />The locations of high density woody plant "Concentration Areas" in BRB -5 Phase III bond <br />release area were documented using aerial photography (Routt County DOQQ 2009) verified by <br />15 <br />