REV12150

• Permit No: C1981041
• IBM Index Class Name: Revision
• Doc Date: 1/26/2001
• Doc Name: STATEMENT OF QUALIFICATIONS
• From: DMG
• To: CELLARDS AND GRIGG
• Type & Sequence: TR33
• Media Type: D
• Archive: No

999
STATE OF COLORADO
DIVISION OF MINERALS AND GEOLOGY
Department of Natural Reinurces
131 }Sherman SL, Room 21 S
Denver, Colorado 80103
Phone. [phone]
FAX. pU3) 83? 8106
January 26, 2001
Cellards and Grigg
Attn: Tom Roberts
390 Union Boulevard, Suite 630
Lakewood, CO 80228
Re: Statement of Qualifications
Dear Mr. Roberts:
DIVISION OF
MINERALS
GEOLOGY
RECLAMATION
MI NING•SAFETY
gJl Owens
Governor
Greg E. Watcher
E+ecmive Director
hvchael8 Long
Dinsion DneUOr
The purpose of this letter, transmitted to you by e-mail and followed by hard copy in the mail, is
to request a Statement of Qualifications from you for development of a concept design of a (new)
drain system, and an analysis of an existing drain system, for mine water discharges from and
underground coal mine. This project was discussed with Byron G. Walker over the telephone.
The design outflow from (and estimated maximum inflow into) the mine is 350 gallons per
minute (gpm). The drain systems would operate unattended.
A plan view of the systems is shown on the Plan View drawing. The proposed system is the
North Decline Dewatering Pipe. The existing system is the Northwest Intake Siphon. A profile is
provided for each system.
The purpose of the proposed system is to keep the surface of the mine water pool below the
elevation of the Northwest Intake Portal floor (elevation 4762). It ccnsists of an angled (40° off
the vertical) pipe drain driven to existing mine workings and arun-out pipe, 200 feet long at
minus 2% grade. The elevation of the invert crest of the proposed system is at a minimum
elevation of 4758 (a limiting factor). The proposed design maximum elevation of the mine water
pool is 4761 (1 foot of freeboazd). Specific products of this analysis are the required (common)
size of pipe and the anticipated maximum elevation of the mine water pool.
The concept of operation for the existing system is to remove any control valves on the siphon
and let the piping system operate as a free flow (uncontrolled, unattended) drain. The purpose of
the analysis of the existing system is to determine the anticipated elevation of the mine water
pool at a discharge of 350 gpm in the event the proposed system is not installed, or where the
proposed system became completely blocked.
The concept designs and analysis need to be in the form of an engineering report, in a suitable
format for presentation as an expert report in litigation. We will require certification of the