REV92106

• Permit No: C1981021
• IBM Index Class Name: Revision
• Doc Date: 8/4/1987
• Doc Name: ALTERNATIVE SEDIMENT CONTROL PROPOSAL BOURG STRIP MINE FN C-81-021
• From: MLRD
• To: WALDEN COAL CO
• Type & Sequence: PR1
• Media Type: D
• Archive: No

III IIIIIIIIIIIII III
STATE OF COLORADO
Roy Romer, Govei
DEPARTMENT OF NATURAL RESOURCES
MINED LAND RECLAMATION DIVISION
DAVID C. SH ELTON, Director
August 4, 1987
Ms. Kay James
Walden Coal Company
C/0 Flatiron Companies
P: 0: Box 224
Boulder; Colorado 80306
Re: Alternative Sediment Control Proposal, Bourg Strip Mine, File No: C-81-021
Dear Ms. James:
On July 18, 1987, a meeting was held between the Division and Walden Coal
Company to discuss a proposal for revision of the mine plan to provide for
alternative sediment control at the Bourg Strip Mine. This meeting followed
an initial meeting on this subject held June 23, 1987. This letter summarizes
the contents of the discussions to date.
A question arose in the June meeting whether the current regulations would
allow for the use of alternate sediment controls (ASC) at the 9ourg Mine.
Following discussion with the Attorney General's office, the Division has
determined that the definition of "other treatment facilities" contained in
Rule 4.05 concerning protection of the hydrologic balance and performance
standards would allow consideration of treatment facilities other than
sediment ponds for control of suspended solids.
Based on the conclusion that a proposal for ASC could be considered prior to
any rule changes in the area, the discussion at the July meeting progressed to
the technical aspects to be considered in a proposal. John D. Stednick,
consultant for Walden Coal Company, described the elements to be included in
developing an ASC plan for the Bourg Mine. The method would use the Modified
Universal Soil Loss Equation and delivery ratios to estimate soil loss within
the permit area which would be represented as mapping units. Areas at
different stages of reclamation would be evaluated in the baseline data
collected. Soils would be observed to interpret erosion or deposition
status. The results of the baseline survey would be used to develop the plan
for implementing sediment control. Some of the available ASC measures were
described.
During the discussion which followed
need to be addressed in the proposal.
effectiveness of the control measures
a23 Centennial Building, 1313 Sherman Street
the Division identified areas which would
Monitoring and reporting of the
would need to be included in the plan.
Denver, Colorado 80203-2273 Tel. [phone]