2011-02-28_REVISION - C1994082 ‎(6)‎

• Permit No: C1994082
• IBM Index Class Name: REVISION
• Doc Date: 2/28/2011
• Doc Name: Phase II Bond Release Application
• From: Seneca Coal Company
• To: DRMS
• Type & Sequence: SL3
• Email Name: SLB
• Email Name: SB1
• Media Type: D
• Archive: No

Yoast Mine SL-3 February 2011
Phase 11 Bond Release Request
• block and extended reference areas and random sample point locations are shown on Maps 1
and 2 of the 2010 vegetation monitoring report.
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 is 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.
0
Total All Total All Hit
Area Hit Cover Allowable Standing Litter Rock Bare Soil
(%) Herbaceous Dead
Cover (%)
Phase II Bond

release Block 57.7 42.97 0.3 30.1 0.9 13.0
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
66.7 35.80 2
5 28
9 0
1 6
4
ERA . . . .
Steep
Mountain 43.5 17.30 2.7 20.9 9.5 27.2
Brush ERA
The reference area derived allowable all hit herbaceous cover success standard is: 0.90
(87.3(.244) + 40.55(.489) + 35.8 (.240) + 17.30 (.027)) = 45.17. The Phase II bond release
block allowable all hit herbaceous cover value for demonstrating success is 42.97.
• 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.
5