GENERAL47002

• Permit No: C1981071
• IBM Index Class Name: General Documents
• Doc Date: 11/17/1983
• Doc Name: AREA 1 SLUMP STABILITY REPORT
• From: YVCC
• To: MLRD
• Permit Index Doc Type: GENERAL CORRESPONDENCE
• Media Type: D
• Archive: No

• • III IIIIIIIIIIIIIIII
YVCC 999
•
Yampa Valley Coal Corporation 129588 Routt County Road #27, Oak Creek, CO 80467 • [phone]
November 14, 1986
Mr. Dan Mathews
Reclamation Specialist
Colorado Mined Land Reclamation Division
423 Centennial Building
1313 Sherman Street
Denver, CO 80203
Dear Mr. Mathews:
RE: Area 1 Slump Stability Report

~~V 1 7 ~Q~ ~
MINED LAND
RECLAMATION DIVISIOf~
CYCC has continued to monitor the three slumps located at the toe of area 1
to determine if they are stabilizing or if alternative stabilization measures
are necessary.
It appears from general
has been little increase in
vegetated and its extent is
during fall observations and
actual slump area. However,
slump area but there was
observations.
measurements taken at slumps B & C that there
the size of these slumps. Slump C is well
not readily discernible. This slump was dry
there is no evidence of perennial water on the
cattails were located off to the sides of the
no flow from these areas during the fall
Slump B is also vegetated and appears to be stabilizing, however, its
face and toe are readily discernible. This slump was dry during fall
observations. As with slump C there were seeps located off the the sides
but not on the slump area. The seeps were not flowing during fall
observations but cattails were present.
Information regarding slump A is less conclusive. This site was
regraded following initial slump measurements. Monument markers were
installed on the site, however, the reoccurrence of the slump was below and
to one side of the markers. As a result, the markers were not useful in
monitoring this slump. Slump A had cattails present on a portion of the
slump area and a very small flow was discernible during fall observations.
In order to obtain better information regarding the stability of these
slumps, a detailed survey of slumps A and B was completed this summer. The
locations of each survey point has been plotted on the enclosed map and
associated figure. The figure shows the survey points which are plotted on
• the map at an expanded scale which can be more readily interpreted. The
enclosed table gives the elevations and mine coordinates for each survey
point. During the survey particular attention was paid to the face and toe
of each slump. In addition, several points were surveyed in the center of