REV106936

• Permit No: C1982057
• IBM Index Class Name: Revision
• Doc Date: 5/31/2000
• Doc Name: Review Memo
• From: DMG
• To: SANDY BROWN
• Type & Sequence: TR36
• Media Type: D
• Archive: No

STATE iii iiiiiiiiiiiii iii
999
OF COLORADO
DIVISION OF MINERALS AND GEOLOGY
Department o(Natural Resources
1313 Sherman St., Room ? 15
Denver, Colorado 80203 D I v 15 1 0 N O F
Phone: [phone] MINERAL S
FAx: [phone] &
GEOLOGY

Interoffice MEMORANDUM RECLAMATION
MINING•SAFETY

to: Sandy Brown Bill Owens
Governor
from: Byron G. Walker~~""`-' Greg E. Watcher

subject: TR-37 Review C-82-057, Seneca II-W EaecNrve Duraor

date: May 31, 2000 Michael B. Long
Dwision Director
references: Your a-mail of May 31, 2000, Seneca II-W, As-bui lt for Haul Road H
The scope of this review, in response to your a-mail of May 31, 2000, is a comparison of the
information in the as-built report and approved design requirements and Drawing 13-20. I A (As-
Built) and Drawing 13-20.1 (Design).
The report is complete and well prepared. The report demonstrates that the road was (to the
extent possible) constructed incompliance with the approved design. The maximum grade
allowed in the design was 10%. The maximum grade of the as-built was 9.99%. Grades differ
slightly at compazable locations. Such slight vaziations could be expected in the field. The
overall alignment and length of the road as constructed (48+00) is that (close) of the design
(48+80.87), and the road was built at the location of the approved design.
With regard to the As-Built (Drawing 13-20.1 A itself, 1 suggest the following comments to the
applicant.
1) Please dimension the cut and fill slopes otcrnss-section B-B'.
2) Please increase the range of channel slope (%) in the Roadside Ditch Schedule to read 1
-10% in lieu of 1- 8 (9.99% reported in the vicinity of 15+00 to 16+00), and check that
gravel is sufTicient at 9.99% to resist erosion at a flow of 2.9 cfs.
I suggest the As-built be added to the Permit Application Package, and not "replace" the design,
as stated on page 2 of the report. Such demonstrates that the road was built as approved.
Please call me if you have any questions.
Cc: Dan Hernandez
File: Support, C-82-057, TR-36
C:\ W PDOCS\Support\TR36rvwmemo.057.doc