_GENERAL DOCUMENTS - C1981017 ‎(218)‎

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

OF'COl0
p DEPARTMENT OF NATURAL RESOURCES
* * David H.Getches,Executive Director
MINED LAND RECLAMATION DIVISION
18,E,
DAVID C.SHELTON, Director
Richard D.Lamm
Governor
DATE: August 10, 1984
TO: Jim Herron
FROM: Roy L. Cox C
RE: Adequacy Review, Sutey Disposal Site,
Coal Basin Mines, File No. C-017-81
The previous adequacy memo for Coal Basin Mine's Sutey Disposal Pile requested
a rewrite of the Probable Hydrologic Consequences of Mining Section of the
Permit and Permit Revision Applications. The Division will have to rewrite
the Probable Hydrological Consequences of Mining and Cumulative Hydrologic
Impacts Sections of the Findings Document for this permit revision. The
company must revise assessments of mining impacts on surface and ground
waters. This reassessment is warranted given the history of problems and
violations the company has received for hydrologic performance standards.
This reassessment is also warranted given the amount of revisions to the
permit and the scattering of information through many documents. Both the
company and the Division must get a better handle on the hydrologic impacts of
the entire mining operation.
The company must identify and determine the magnitude of hydrologic impacts
from each mine, the load-out facilities, coal processing waste piles, mine
development rock piles, tunnel rock pile, coal preparation plant, thickner
ponds, water treatment facilities, and any other facility or structure which
uses, consumes, or is in contact with surface and ground waters. The company
should prepare a water balance analysis for the entire mining operation. The
company should assess each surface and ground water quality impact of the
entire mining operation. The company should describe, in detail , how each
quality and quantity impact is being mitigated to minimize impacts by the best
available practice.
The revised probable hydrologic consequences analysis should be prepared
using: 1 ) the existing probable hydrologic section of the permit document, 2)
projected hydrologic impacts found in revisions to the permit, 3) empiric data
obtained from monitored impacts of mining (e.g. NPDES records and monitoring
data) , 4) baseline data, 5) existing mine plans, 6) existing reclamation
plans, and 7) existing sediment control and diversion plans.
423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel.[phone]