2018-09-04_PERMIT FILE - C1981019A

• Permit No: C1981019A
• IBM Index Class Name: Permit File
• Doc Date: 9/4/2018
• Doc Name: Volume 1 Rule 4
• Section_Exhibit Name: 4.01 Throuugh 4.30
• Media Type: D
• Archive: Yes

RULE 4 PERFORMANCE STANDARDS
procedure, DRMS may be contacted to initiate alternate reclamation procedures for the remainder
of Colowyo reclamation.
As of March, 2008, these test plots had not been constructed because of the impending revision to
the reclamation plan. Because of this revision and the reasonable promise of success for the new
proposed procedures, construction of these test plots has been placed "on -hold" until as such time
as they may become necessary.
Aspen and Tall Shrub Establishment Areas
As a result of negotiations with CPW and DRMS, Colowyo has committed to implementing three
field trials. Based upon initial estimates of disturbance to aspen and tall shrub habitats in the South
Taylor area, a determination was made that the establishment of 20 acres of aspen habitat and 20
acres of tall shrub habitat (combination of thin and thick topsoil locations) be established in the
South Taylor reclamation area (mining disturbance area). As a result of subsequent changes to the
mine plan, approximately (7% or 14 acres) of the aspen and (41% or 347 acres) of the tall shrub
habitat previously targeted for disturbance will no longer be affected. A reduced area of (18.5)
acres of aspen and (12.0) acres of tall shrubs will now be pursued at Colowyo. The field trials are
meant to provide information to Colowyo, DRMS and the CDOW about the appropriate
expectations for success/failure of establishing these habitat types at Colowyo in the context of a
ten year bond clock and also to provide some baseline information that can be used to modify
practices and the plant materials used to meet the current expectations (acres of each habitat type
identified above). Another potential use of the information provided by these trials may be to
provide Colowyo with an avenue for relief of the aspen and tall shrub establishment area
expectations for South Taylor should efforts prove to be unsuccessful despite the incorporation of
best management practices.
The standard interim revegetation monitoring techniques and practices (performed by a third party)
applied to the other reclamation areas at Colowyo will be utilized annually to measure progress of
the trials through and beyond 2016, when Colowyo, DRMS and CPW will revisit the expectations
for further larger scale establishment of these habitat types once reclamation activities begin in
earnest in the South Taylor area (currently expected post 2017). All data will be captured, collated
and presented as part of the Annual Reclamation Report provided to DRMS. Alternative methods
for complying with the aspen and tall shrub establishment areas may be negotiated with CPW after
the 2013 growing season should initial 2011 planting and potential subsequent 2012 re-
seeding/replanting efforts prove unsuccessful.
1) Colowyo agrees to establish one small (one acre) aspen establishment area on associated
disturbance in an area where the original lithology has been previously disturbed. The location of
this area will be in the immediate proximity of the South Taylor X coal pod as portrayed below
and on Map 28B. The location for this trial represents elevation and aspect characteristics that are
very similar to the aspen areas disturbed in the South Taylor area. Slope characteristics are more
moderate than the native areas disturbed, but for purposes of implementing and monitoring this
trial it was determined essential that access and stability of the test location be manageable. Actual
results from the trial should yield information that can be used to apply additional stability and/or
sediment control measures on larger areas if this attempt is successful. The specific
implementation plan of the site is as follows:
Rule 4 Performance Standards 4-55 Revision Date: 5/25/18
Revision No.: RN -07