Laserfiche WebLink
monitoring report contained in Attachment D — Revegetation Success Supporting <br />Documentation. <br />2012 Species Diversity Success Evaluations <br />Success for Mandatory Test A requires that no single species comprise greater than 60% relative <br />cover in the 2012 reclaimed Phase III bond release area. Table J-1 of the revegetation monitoring <br />report (Attachment D — Revegetation Success Supporting Documentation) shows that the most <br />abundant single species alfalfa (Medicago sativa) was 29.5% relative first -hit cover, well below <br />the 60% threshold of concern. <br />Thus, Mandatory Test A is passed based on assessment of 2012 cover data. <br />With regard to Alternative Test B, Total Species Density Test, the standard is the point at which <br />the central 75 percent of the distribution of overall species density in the Reference Areas begins. <br />Mathematically this would be the Mean Reference Area species density (# of species per 100 sq. <br />m.) — 1.15s where s is the standard deviation. The following is calculated for the 2012 BRB-1 <br />Phase III release area (see Table J-2 in Attachment D): <br />Mean Species density (un -weighted, without noxious species) in the four reference areas <br />= 28.8 species per 100 sq.m. <br />Probability -adjusted density standard: <br />Mean Reference Area Species Density -1.15s = 28.8 —1.15 (6.41) = 21.43 <br />Mean total species density in the 2012 BRB-1 = 26.14 <br />' Since the reclaimed area value (26.14) was gr6ater than the standard (21.43), Alternative Test B ' <br />is passed for 2012 data. <br />Regarding Alternative Test C, this test uses the Motyka similarity index to assess the <br />resemblance of the distribution of species density by life form of the reclamation vegetation <br />compared to that of the Reference Areas. The Motyka index formula used is: <br />2c <br />ism, <br />SL -6 - 25 <br />