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Seneca Coal Company <br />Phase 11 Bond Release Request <br />To satisfy Alternative Test C for BRB-4, the similarity index for BRB-4 compared to the <br />mountain brush reference area is: <br /> Species Density/100m2 <br />Life Form BRB-4 MB Ave <br />Annual/Biennial Forbs 9.2 4.0 <br />Annual Grasses 1.1 0.2 <br />Perennial Forbs 8.8 15.9 <br />Perennial Cool Season Grasses 9.3 6.6 <br />ISmoMB=((4.0+0.2+8.8+6.6)2)/(9.2+4.0+1.1 +0.2+8.8-t-15.9+9.3+6.6)= <br />71.1% <br />To satisfy Alternative Test C for BRB-4, the similarity index for BRB-4 compared to the <br />sagebrush reference area is: <br /> Species Density/.LOOm2 <br />Life Form BRB-4 SB Ave <br />Annual/Biennial Forbs 9.2 3.1 <br />Annual Grasses 1.1 OA <br />Perennial Forbs 8.8 14.7 <br />Perennial Cool Season Grasses 9.3 8.3 <br />ISmoMB=((3.1+0.0+8.8+8.3)2)/(9.2+3.1+1.1+0.0+8.8+14.7+9.3+8.3)= <br />74.1 <br />The weighted average similarity for the reference areas to BRB-4 is: <br />74.1% X 0.17+71.1% X 0.83=71.6% <br />This value is greater than the 90 percent of the approved standard (0.9 X 70% = 63%), thus <br />BRB-4 passes the Alternative Test C. <br />May2008 <br />13 <br />