_GENERAL DOCUMENTS - C1981017 ‎(253)‎

• Permit No: C1981017
• IBM Index Class Name: GENERAL DOCUMENTS
• Doc Name: Bid Documents ‎(IMP)‎ 1994 Correspondence
• Permit Index Doc Type: General Correspondence
• Media Type: D
• Archive: No

STATE, OF COLORADO
DIVISION OF MINERALS AND GEOLOGY
Department of Natural Resources plow 'NW
1313 Sherman St., Room 215
Denver,Colorado 80203
Phone [phone]
FAX:[phone]
DEPARTN1ENT OF
NATURAL
July 20 , 1994 RESUORCES
Roy Ramer
Mr. Bernard Freeman G,-�ernor
Office of Surface Mining ia-,e,
505 Marquette Avenue N.W. `-`e`-
Suite 1200 „icn�el s
Dire,_:or
Albuquerque New Mexico
87102
RE: Mid-Continent Resources Coal Basin Mine
Dear Mr. Freeman:
I would like to take this opportunity to update you on recent
developments at the Coal Basin Mine, and to respond to your July
15, 1994 correspondence.
Regarding our June 20 , 1994 site inspection, I would like to add a
few details regarding the discussions which the various State and
Federal agencies had at the mine site. It was agreed by both the
Office of Surface Mining (OSM) and the State that, due to the
dynamics of the stream channel (flow characteristics and channel
materials in the valley) and because of the debris flows which
occur in this area, the new channel would be most environmentally
sound if it mirrored the current channel cross sectional area. It
was further acknowledged and agreed that the reconstructed channel
could experience channel scour until the stream reached an
equilibrium. Robert Jarrett of the United States Geological Survey
noted that due to the volume of materials carried and deposited by
the debris flows, equilibrium was a dynamic process of scour and
deposition. It was acknowledged that due to the dynamic nature of
the stream channel , resultant sedimentation would occur. It was
agreed by all that foundations must be completely removed in order
to prevent the formation of an artificial nick point which would
influence stream direction and gradient.
It was generally acknowledged that the steam should probably be
reconstructed so that it flows through the area where the ambulance
shop is currently located. From that point, the channel would
generally strike toward the current mine entrance gate, where it
would be confluent with Coal Creek. The point of cut out from the
present channel has not been determined, pending analysis of the
aerial photos which depict the Dutch Creek cut bank near the refuse
pile.