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Reference area as 17 percent of pre-mining vegetation cover. Although quantitative sampling of <br />• reclaimed areas was conducted at Seneca II Mine in 2000 for purposes of monitoring and not for <br />the purpose of bond release, a line that demarcates 90 percent of this standard has been placed <br />on Figure 1 for illustrative purposes. It is presumed that when sampling for bond release does <br />occur and when the parameter mean for a bond release block is at least 90% of the calculated <br />success standard or approved technical standard, then revegetation will be considered <br />successful for that parameter. <br />The calculation of 90 percent of the cover performance standard appropriate for 2000 sampling is <br />demonstrated below. <br />90% of the Cover Standard = 0.90{2[0.83(17.4) + 0.17(29.6)]} = 35.1 percent cover <br />HERBACEOUS PRODUCTION: The performance standard for this parameter is calculated <br />similarly to the cover performance standard, except that the factor of 2 is omitted. Where 341 = <br />oven-dry Ib/ac production in the Seneca II Mountain Brush reference area and 632 =oven-dry <br />Ib/ac production in the Seneca II Sagebrush reference area. <br />90% of the Cover Standard = 0.90{ [0.83(341) + 0.17(632)]} = 351 oven-dry Ib/ac <br />WOODY PLANT DENSITY: For purposes of illustration, woody plant density at the Seneca II <br />Mine is evaluated in this document using a technical standard of 2000 shrubs per acre. In future <br />years, Woody Plant Density sampling will be refined such that special shrub planting units are <br />defined and monitored separately from other areas at the mine. These special shrub planting <br />• units will be evaluated using a technical standard of 2000 stems per acre and all other areas will <br />be evaluated using a lower standard. <br />Climatic Data <br />SCC provided precipitation data from the Seneca II Mine for the period of January 1982 through <br />September 2000. Since the long-term average for the mine exists for only 17 years, the long <br />term average monthly precipitation data from the National Oceanic and Atmospheric <br />Administration (NOAA) for the nearby town of Hayden was used as an appropriate base for <br />comparison. Information of degree-days was also derived from the NOAA records at Hayden. <br />• <br />