REV11548

• Permit No: C1981044
• IBM Index Class Name: Revision
• Doc Date: 4/14/1994
• Doc Name: REQUEST FOR MR 94-31 CLARIFICATION OF PERMIT PAGE
• From: CYPRUS EMPIRE CORP
• To: DMG
• Type & Sequence: MR32
• Media Type: D
• Archive: No

_ .~_
c~~us
"~ Bmpire Corporation
April 11, 1994
P.O. Box 68
Craig, Colorado 81626
303-824-8246
RECEIVED
APR 141994
Janet H. Binns
Environmental Protection Specialist
Division of Minerals and Geology
1313 Sherman Street, Room 215
Denver, CO 80203
Di:~icion of Minere1S ~ Geolo9Y
~~ I I I~ I I~ I I~ II~~ II~
Re: Request for Minor Revision 94-31. Clarification of Permit Page: Permit C-81-044,
Cyprus Emoire Corporation
Dear Ms. Binns;
Per our previous telephone conversation, CEC is submitting the enclosed MR request to
modify the language pertaining to the current in-place culvert size for culvert #38, and to
confirm the details concerning the replacement of this same culvert behind the coal-
stockpile. As previously noted, the existing culvert was damaged by coal handling
activities, thus requiring that a replacement culvert be installed. CEC plans to install an
18" diameter smoothe steel pipe with heavier walls than available with cmp for the
replacement, as this will aid in maintenance of the culvert and will not be as easily
damaged by equipment during coal handling activities. As discussed, CEC wishes to
place the replacement culvert inlet approximately 30 - 40 feet further to the south, which
will inturn allow us to slightly increase the grade on the culvert to aid in maintenance. In
addition, CEC plans to fill the segment of ditch below this point with clean fill to allow
better access to the south-west corner of the stockpile to aid in coal handling activities.
Per our discussion, we do not believe that this will affect the drainage control for this
area, as the short segment of ditch in question is well within the remaining sediment
control. As such, any drainage from this small area will find its way into the existing
sediment control system.
The slight increase in the gradient of the culvert will not result in a significant change in
exit velocities, and as such there should be no concerns over lower channel erosion
below the culvert. The use of the smoothe steel rather than cmp, in conjunction with the
slight increase in the culvert gradient, provides for an even greater degree of over-sizing
on this culvert and should aid in the maintenance of same.
Revised page Ex.18-267 is enclosed, along with a minor revision request form.