REV97773

• Permit No: C1980003
• IBM Index Class Name: Revision
• Doc Date: 11/15/2005
• Doc Name: Bond Release Application
• From: Hydro-Environmental Solutions Inc
• To: DMG
• Type & Sequence: SL4
• Media Type: D
• Archive: No

November 2005 Hayden Gulch Mine * Final Bond Release Application 1Page 12
reference area, but that the species diversity itt the four parcels was slightly higher
than the reference area. The 2004 data indicated that the pazcel with the highest
species density value (Slump Area - 23 species per 100 sq. m.) was also the pazcel
that fell short of the cover value performance standard. The species diversity data
observed for 2004 and 2005 displayed a similar trend -introduced perennial
grasses were the dominant life form. Bromopsis inermis (smooth broom) typically
was the most common introduced perennial grass species followed by Thinopyrum
intermedium (Intermediate wheatgrass).
This perverseness of perennial grasses is similar as to that observed in the 1996 and
1997 vegetation sampling which was used as the basis for the 1998 Phase IUPhase
III bond release request (TerraMatrix, 1998). Table 5, Comparison of Select
Species Diversity Data, provides a compazison of the 2004/2005 versus 1996/1997
relative percent cover of the dominant grass and forb species.
~~ TABLE 5 ~ - -
COMPARISON OF SELECT SPECIES DIVERSITY DATA
2004 2005 1996 1 997

Species Permit
i Ref
: Permit
~ Ref
: Reclaim
n NO°
contiguous Reclaim
n No°-
contiguous
Area Area Area Area Area a Area ~
(%) (%) (%) (%) (%) s
A (%) A o/as
%
Bromopsis inermis 42.9 49.8 47.1 30.6 27.7 31.0 22.8 27.8
smooth brome
Thinopyrum intermedium 20.1 21.6 21.6 32.4 14.0 2.5 13.3 8.8
intermediate wheat ass
Paycopyrum smithii 5.7 Ll 3.2 0.4 14.0 10.0 13.3 12.8
western wheat ass)
Poa species 2.8 4.9 5.4 7.0 5.4 12.0 2,8 7.8
blue s
Astragalus cicer 4.0 13.5 2.5 19.7 5,2 17.0 4.5 I1.5
cicer milkve[ch
Notes: 1) Permit Area values equal average relative percent cover values for parcels E, HG-8, 003 and Slump Area.
2) Ref Area values equate to the area-weighted percent cover values for the reference area samples.
3) Reclaim area values for 1996 and 1997 are from the reclaimed mined azea samples (TerraMatrix, 1998).
4) Non-contiguous area values for 1996 and 1997 are from the topsoil pile A and B, sanitary land£ll area and
ex losive stora a area sam lin units (TerraMa[rix, 1998).
As shown on Figures 1 and 2, the average woody stem density of the three shrub
augmentation parcels met the performance standazd of 750 stems per acre.
The 2004 and 2005 vegetation data indicates that the revegetation in the four
parcels meets the success criteria for cover, species density and shrub density
parameters. Consequently, the four parcels that make up the Hayden Gulch Mine
meet the vegetation bond release criteria pursuant to Rule 4.15.8.
4. Documentation of Productivity from Reclaimed Alluvial Palley Floors and Cropland.•
• Not applicable -the Hayden Gulch Mine did not disturb any alluvial valley floor or
cropland.
5. Documentation of Topsoil Replacement:
• The 1998 Phase II/Phase III bond release application package included a discussion
of topsoil replacement activities at the Hayden Gulch Mine (TerraMatrix, 1998).
CDMG approved topsoil replacement at the Hayden Gulch Mine in a letter dated