2012-04-02_REPORT - C1980005 ‎(6)‎

• Permit No: C1980005
• IBM Index Class Name: REPORT
• Doc Date: 4/2/2012
• Doc Name: 2011 Revegetation Monitoring Report
• From: Seneca Coal Company
• To: DRMS
• Permit Index Doc Type: Reveg Monitoring Report
• Email Name: JDM
• Email Name: DIH
• Media Type: D
• Archive: No

Calculation of 90 percent of the cover performance standard appropriate for 2011 sampling using the
highest possible value for the Mountain Brush Reference Area component is demonstrated below.
Mountain Brush Reference Area Allowable First -Hit Herbaceous Cover *(24.4 %) X 2 = 48.4%
Sagebrush Reference Area Allowable First -Hit Herbaceous Cover *(44.4 %) X 2 = 88.8%
90 percent of the Cover Standard = 0.90 [0.83(48.4 %) + 0.17(88.8 %)] = 49.7%
* Herbaceous cover adjusted by subtracting noxious weeds and annual/biennial plant cover in excess of 10% of the remainder.
The mean allowable first -hit herbaceous vegetation cover sampled in 2011 BRB -5 was 59.7 percent,
exceeding 49.7 percent, which is 90 percent of the upwardly adjusted cover performance standard (see
also Figure C -1, Table C -1). Thus for 2011, successful revegetation with respect to allowable first -hit
herbaceous cover is indicated.
HERBACEOUS PRODUCTION
Calculation of 90 percent of the cover performance standard appropriate for 2011 sampling is
demonstrated below.
Mountain Brush Reference Area Allowable herbaceous production* = 835.1 Ibs /acre
Sagebrush Reference Area Allowable herbaceous production * = 1286.5 Ibs /acre
90 percent of the Production Standard = 0.90 [0.83(835.1) + 0.17(1286.5)] = 820.7 Ibs /acre
* Herbaceous cover adjusted by subtracting noxious weeds and annual/biennial plant cover in excess of 10% of the remainder.
As can be seen in Figure 2, the 2011 BRB -5 mean allowable herbaceous production of 2193.0 pounds
per acre far exceeded 90 percent of the production performance standard. The average annual and
biennial sampled 2011 BRB -5 production was not greater than 10 percent of total herbaceous production
and therefore no "excess" annual /biennial production deduction was used in 2011. Noxious weed
production was not collected.
Since the 2011 BRB -5 allowable herbaceous production exceeds 90 percent of the production
performance standard (Figure C -2, Table C -1), and sample adequacy has not been demonstrated in
either the reclaimed or the reference areas (minimum of 30 samples) (Tables C -4), reclamation success
for Phase III is demonstrated by passing a Two - sample t -test of Reverse Null Hypothesis with
Satterthwaite's Adjustment (CDMG 2010 proposed rules revisions 4.15.1 (2)(c)).
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