PERMFILE114435

• Permit No: C1981013
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: EXHIBIT 30 SANTISTEVAN AVF STUDY
• Media Type: D
• Archive: No

INTRODUCTION
Wyoming Fuel Company (WFC) is planning
to conduct secondary or retreat mining at [he
Golden Fagle Mine (Permit C-81-013). A portion
of the mine plan area which is to be mined by
this method lies under Santistevan Canyon which
is in the northwest corner of the permit area. As
stipulated in the permit, Alluvial Valley Floor
(AVF) studies must be conduMed to assess this
potential resource and determine the extent o[
any potential impacts associated with the
proposed mining activity.
This report presents the results of the AVF
investigations conducted in Santistevan Canyon
and respond directly to stipulations placed on the
permit which include:
Stipulation No. 8
Prior to secondary or retreat mining at the
Golden Fagle Mine, the permittee shall
provide a hydrologic survey identifying all
alluvial aquifers in, or adjacent to the permit
area (except for the Purgatoire River alluvial
• aquifer which has already been identified).
This survey shall contain information
concerning depth below the surface,
horizontal extent, water use, and quantity and
quality of ground water as required under
rule 2.04.7(1). The permittee shall also
provide a discussion of the probable
hydrologic consequences of mining upon
those alluvial aquifers identified.
~'V~ Stinulation No. 12
Prior to secondary or retreat mining under
Santistevan Canyon Drainage, the permittee
must collect data on the quantity of water
flowing in this drainage. Monitoring must be
sufficient to differentiate seasonal flow
variations.
The permittee must provide an amendment of
the probable hydrologic consequences of
secondary or retreat mining on the quantity
and quality of surface water in Santistevan
Canyon.
Stipulation No. 14
Prior to secondary or retreat mining under
Santistevan Canyon, the petmittee must
submit to the Division sufficient evidence for
the Division to make findings that secondary
or retreat mining under this Canyon will:
1. Not interrupt, discontinue, or preclude
farming on the alluvial valley floor;
2. Not cause material damage to the quantity
of groundwater that supplied the alluvial
valley [loor; and
3. Preserve the essential hydrology functions
of the alluvial -alley floor.
On April 12, 1989, WFC submitted a request
for Technical Revision to the Golden Fagle
Permit which outlined the scope of activities for
the Santistevan Canyon studies. This Technical
Revision waz approved by the Division on April
20, 1989. Studies to be conducted for this
technical revision included the necessary data
collection to respond to the above stipulations.
Information collection included subsurface
stratigraphy, surface water, groundwater, soils,
vegetation, and land Cue data. Assessment of this
data will provide the necessary information for
the Division to make their findings for the
approval or denial of the proposed longwall
mining method under this area.
The following sections of this report
summarize the materials and methods utilized in
the study, data collected, and the wnclusions
obtained from the analyses.