2008-08-11_PERMIT FILE - C1992080 ‎(3)‎

• Permit No: C1992080
• IBM Index Class Name: Permit File
• Doc Date: 8/11/2008
• Section_Exhibit Name: APPENDIX 5-2 SEDIMENT POND CONTROL DESIGN
• Media Type: D
• Archive: No

3.2 COMPARISON OF RECLAIMED AREA AND SUCCESS CRITERION
The collection of statistically adequate data for the parameter of total vegetation cover
allows for the statistical evaluation of compliance with the revegetation success criterion
of the mining and reclamation permit.
3.2.1 Total Vegetation Cover
Total vegetation cover of the reclaimed areas was measured at 63.60 percent. Since the
total vegetation cover of the reclaimed area is greater than the revegetation cover success
standard of 40 percent, no statistical evaluation was required.
3.2.2 Species Composition
While the Carbon Junction Mine does not have a species composition requirement, the
statute requires that a diverse assemblage of vegetation be established on the reclaimed
area. Evaluation of species composition is based on quantitative relative cover data.
Reclaimed area sampling this year identified seven species which each accounted for
greater than three percent relative cover. These species were Agropyron intermedium
(30.63%), Bromus marginatus (15.40%), Agropyron smithii (13.87%), Onobrychis
viciaefolia (12.69%), Melilotus officinalis (8.12%), Agropyron dasystachyum (7.11%),
and Agropyron cristatum (6.77%). A lifeform analysis of the above species reveals five
cool season perennial grasses, one cool season perennial forb, and one biennial forb.
3.2.3 Ground Cover
Sedimentology demonstrations required for evaluation of levels of erosion from
reclaimed areas utilize factors that rely on the estimation of ground cover, defined as live
vegetation cover and litter that intercepts falling precipitation and reduces potential
erosive forces from the precipitation. In Technical Revision 15, the ground cover of the
reclaimed areas at the Carbon Junction Mine was estimated at 90 percent. Total live
vegetation cover from the 2008 sampling revealed 63.60 percent mean live vegetation
cover and 29.20 percent litter cover, for a total ground cover of 92.80 percent. The 2008
vegetation sampling data exceeded the estimated ground cover from Technical Revision
15.
4.0 DISCUSSION
The reclaimed areas at the Carbon Junction Mine was quantitatively sampled in the third
growing season for vegetation cover and species composition to evaluate revegetation
success and verify selected sedimentology values.
Oakridge Energy Carbon Junction Mine Page 6
2008 Vegetation Sampling Report