2014-10-15_PERMIT FILE - C1982056A ‎(7)‎

• Permit No: C1982056A
• IBM Index Class Name: Permit File
• Doc Date: 10/15/2014
• Doc Name: Pages 2.05-65 to 2.05-197.3 part 2
• Section_Exhibit Name: 2.05 Operation and Reclamation Plans Part 2
• Media Type: D
• Archive: Yes

S = Sample standard deviation
n = Sample size
• t, = Calculated t value
t, = Table t value
The null hypothesis being tested is that the reclaimed area mean (g) is greater than or equal to 90 percent of the
standard, stated as Ho: g >_ Q. If t, is less than or equal to the one - tailed t table value for alpha error probability of
.10, at (n -1) degrees of freedom (infinite degrees of freedom may be used if n >30), then Ho is not rejected, and
revegetation is deemed successful for the parameter tested.
If sample adequacy for "First Hit' vegetation cover or herbaceous production has not been achieved after a
minimum of 30 samples in the reclaimed area and the means for "First Hit' foliar cover or herbaceous production
exceed 90 percent of the reference area - derived standard, then the hypothesis of reclamation success will be tested
under the conditions of a "reverse null' approach using a parametric test of the "reverse null" hypothesis. This
would be according to the following expression (CDRMS Coal Section, 4.15.11 (2)(c)):
** _ x —Q
bC S_
X
LVATf I
Y = Reclaimed Area Sample Mean
Q = 90 percent of Standard
S_ = Standard error of mean [ s / Fn ]
X
S = Sample standard deviation
• n = Sample size
t, = Calculated t value
t, = Table t value
The null hypothesis being tested is that the reclaimed area mean (g) is less than or equal to 90 percent of the
standard, stated as Ho: g <_ Q. If tc is greater than the one - tailed t table value for alpha error probability of 0.20,
with (n -1) degrees of freedom (infinite degrees of freedom may be used if n >30), then Ho is rejected, and
revegetation is deemed successful.
For the above (one - sample) t -test, it will be necessary to have achieved sample adequacy in the reference area
sampling. If adequacy is not achieved in the reference area, then the more complex calculations associated with a
two - sample t -test would be undertaken.
Reclaimed area cover will be addressed in hypothesis testing as percent absolute first hit vegetation cover as
adjusted for excessive contribution by annual / biennial species (CDRMS 1995, Guidelines Regarding Selected
Coal Mine Bond Release Issues, 1 (IV)A(4)). Cover from reclaimed area samples will be addressed as percent
absolute first hit vegetation cover. Cover from reference area sampling will be first hit vegetation cover.
Hypothesis testing for production will be based on total annual herbaceous production also adjusted for excessive
contribution of annual / biennial species. Vegetation cover or production values used in hypothesis testing will
exclude values for species present on the Routt County Prohibited or Restricted Noxious list or that are listed as
noxious by the State of Colorado (Colorado Department. of Agriculture, Division of Plant Industry, Title 35,
Article 5.5, 101 -119, Lists A and B of Rules as replaced 2003).
Premining land use for areas currently reclaimed did not include industrial or residential use; therefore, the
•requirements of Rule 4.15.10, Previously Mined Land, are not applicable to the permit application using procedures
previously approved by CMLRD and OSM.
RNOS -05 2.05 -117.4 03/12/10