2010-04-05_REPORT - C1994082

• Permit No: C1994082
• IBM Index Class Name: REPORT
• Doc Date: 4/5/2010
• Doc Name: 2009 Annual Revegetation Monitoring Report
• From: Seneca Coal Company
• To: DRMS
• Permit Index Doc Type: Reveg Monitoring Report
• Email Name: DTM
• Email Name: SB1
• Media Type: D
• Archive: No

•
Table 21. Sample Adequacy - Yoast Mine, SCC, Routt Co., CO - 2009
---ALLOWABLE ALL HIT---
"
---HERBACEOU
S PRODUCTION---
----WO
ODY PLANT
DENSITYS
------- --------C OVERS-------- ------ --H ERBACE OUS COVER

Foliar

N-min

Foliar

Std.
N-min
m/0.5
9
Std.

'
N-min
#/100
Std. N-min
Cover Std. N' t z Cover (%) Dev. N' t (n-1), z sq.m. Dev. N t (n-1 ), sq.
0
383
1
502
AREA (%) Dev. 9 2
58 14.0 10 1.383 12 124.7 58.5 10 1.383 43.0 2.1 3.4 1 .
2002 Reclaimed Area 55.6 12.0 10 1.383 . g 119
9 54
8 10 1.383 40.0 31.6 22.7 10 1.383 99
2005 Reclaimed Area 59.2 11.5 10 1.383 8 58.1 11.8 10 1.383
216 ,
5
119 .
61
9
14
1.345
49.0
35.1
38.8
14
1.345
222
2007 Reclaimed Area 50.1 16.3 14 1.345 20 17.7 19.3 14 1.345 8 .
1
72 .
5
27 10 1.383 28.0 NC NC NC NC NC
Aspen Ex. Ref.Area' 86.9 5.1 15 1.345 1 76.5 16.1 15 1.345 10 .
34
8 .
0
14 10 1.383 31.0 NC NC NC NC NC
Mountain Brush Ext. Ref. Area' 71.2 8.6 17 1.337 3 35.9 8.4 17 1.337 9 .
4
35 .
6
21 10 1.383 71.0 NC NC NC NC NC
Sagebrush Ext. Ref. Area' 57.5 9 15 1.345 5 29.2 6.4 15 1.345 8 .
11 39
9 .
2
13 11 1.372 21.0 NC NC NC NC NC
Stp. Mtn. Brush Ext. Ref. Area'
32.1
4.6
15
1.345
4
16.4
3.3
15
1.345
.
.
*All extended reference area data was collected at Seneca IIW mine
'N = Sample Size
2N-min = Minimum sample size necessary to detect a 10% reduction in the mean (15% reduction for Woody Plant Density) with 90% confidence using n-1 degrees of freedom
3First hit data
a Sample adequacy (N-min) calculated usinq individual samples and all-hit herbaceous cover corrected for "excess" annual cover and noxious weeds.
5A square root transformation was performed prior to calculations for Woody Plant Density
NC = Not Collected