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• contributed 7.97 percent of the total relative cover on this site. Rubber Rabbitbrush was the <br />most commonly encountered shrub, contributing 6.68 percent of the total relative cover on this <br />reclaimed site. <br />The final revegetation success standazd for plant cover for this site is to be determined based <br />upon a weighted average from the sampling of the two reference areas. However, based upon <br />the historic sampling of the Grassland Reference Area, where sample adequacy was obtained in <br />1987 and 1997 yielded a value of 40.50 percent. Ninety percent of this value would be 36.45 <br />percent. The total cover value obtained from the 2005 reclamation sampling of 30.93 percent is <br />less than the probable revegetation success standard and this is not unexpected as this site was <br />last seeded in October 2004 and thus the sampling results obtained from this site represent only <br />the second yeaz's plant growth. <br />The locations of the 30 production transects are shown on Map 1, Southfield Mine Area - <br />Vegetation Transect Location Map. Copies of the original field data sheets for this area are <br />found in Appendix D -Copies Corley Reclamation -Production -Plant Cover Field Data Sheets. <br />Table 2, Southfield Mine Sample Adequacy Calculations, reveals that the plant cover on this <br />site at the 90 percent confidence interval was determined to equal 5. I transects. <br />Production. The results obtained from the 30 production transects sampled on this site are <br />presented in Table 7, Corley Reclamation -Production. The average total production on this site <br />was determined to equal 19.12 g/1/4mZ or 681.4pounds of air-dry forage per acre. Perennial <br />• grasses contributed an average of 14.79 g!1/4mZ or 77.4 percent of the total forage production. <br />Perennial forbs, contributed an average of 1.99 g/1/4mZ or 10.4 percent of the total production. <br />Annuals contributed a total of 2.34 g/1/4mZ or 12.2 percent of the total production. <br />The final revegetation success standazd for forage production is to be based upon sampling of the <br />two designated reference areas and by using a weighted average of these production values. No <br />reference area sampling was conducted during this interim monitoring and therefore, no absolute <br />revegetation success standazd is available. However, based upon the previous reference azea <br />sampling conducted on the Grassland Reference Area conducted in 1987 wherein it was <br />determined that forage production averaged 74.08 grams / m2 or 660.1 pounds of air dry forage <br />per acre and in August of 1997 wherein production was determined to average 32.55 g/1/4 m2 or <br />1,160 pounds of air dry forage per acre. Using these historic reference area data, the relative <br />revegetation success standazd for forage production would be approximately 25.54 g/1/4 m2 or <br />910 pounds of air dry forage per acre. <br />The 19.12 grams / 1 /4 m2 or 681.4 pounds of air dry forage per acre obtained from the 2006 <br />monitoring is less than the probable revegetation success standard of 22.99 (90% of 25.54) g/1/4 <br />m2 and this is not unexpected since the 2006 sampling represents revegetation that was last <br />seeded only in October 2004 and would be plant growth at only the end of the second yeaz's <br />growing season. However, this value is very encouraging for only two growing seasons. <br />Table 2, Southfield Mine Sample Adequacy Calculations, reveals that the forage production on <br />. this site at the 90 percent confidence interval was determined to equal 23.7 transects. The <br />