2012-01-13_REVISION - C1994082

• Permit No: C1994082
• IBM Index Class Name: REVISION
• Doc Date: 1/13/2012
• Doc Name: 4th Adequacy Review
• From: Seneca Coal Company
• To: DRMS
• Type & Sequence: SL3
• Email Name: SLB
• Email Name: SB1
• Media Type: D
• Archive: No

Area
Total All
Hit Cover
( %)
Total All Hit
Allowable
Herbaceous
Cover ( %)
Standing
Dead ( %)
Litter
( %)
Rock
( %)
Bare Soil
( %)
Phase II Bond
release Block
58.7
45.35
0.3
29.9
0.7
13.8
Aspen ERA
159.1
87.30
0.4
6.8
0
2.4
Mountain
Brush ERA
117.7
40.55
0.4
12.5
0.1
4.7
Sagebrush
ERA
66.7
35.80
2.5
28.9
0.1
6.4
Steep
Mountain
Brush ERA
43.5
17.30
2.7
20.9
9.5
27.2
Table 1 provides a summary of the cover attributes for the Phase II bond release block and the
four native types in the extended reference area. Table 1 also provides the allowable
herbaceous cover values used in the success evaluations for cover.
The derivation of total allowable herbaceous cover for the reclaimed and reference areas is
included in the vegetation evaluation report for the Phase II bond release block included in
Attachment E.
The approved cover success standard for the Yoast mine is 90 percent of the allowable all hit
herbaceous cover determined from adjusting the total all hit cover, as described above, and
then weight averaging the values (based on relative community composition) for the aspen,
mountain brush, sagebrush and steep mountain brush types in the extended reference area.
The allowable all hit herbaceous cover values for the four native vegetation types in the
extended reference area and the Phase II bond release block are shown in Table 1.
Table 1. Vegetation Cover Sampling Summary, Phase II Bond Release Block and
Extended Reference Area (ERA), Yoast Mine.
The reference area derived allowable all hit herbaceous cover success standard for the
Phase II bond release block is:
0.90 (87.3(.244) + 40.55(.489) + 35.8 (.240) + 17.30 (.027)) = 45.17.
Sample adequacy was met for the bond release blocks and reference area sampling. The
sampling results for total all hit cover and allowable all hit herbaceous cover are summarized
below in Tables 2 and 3.
6 Revised 11 /11