GENERAL30149

• Permit No: C1981016
• IBM Index Class Name: General Documents
• Doc Date: 6/19/1989
• Doc Name: WESTERN SLOPE CARBON HAWKS NEST MINE GOB DISPOSAL PIT
• From: MLRD
• To: DELTA COUNTY HEALTH DEPT
• Permit Index Doc Type: RECLAMATION PROJECTS
• Media Type: D
• Archive: No

III IIIIIIIIIIIII III
999
STATE OF COLOI~L)U
Roy Romer, Govei
DEPARTMENT OFNATURAL RESOURCES
MINED LAND RECLAMATION DIVISION
FRED R. BANTA, Dlreetor
June 19, 1989
Mr, Y,enneth IJordstrnm
Director of Environmental health
Delta County Health Department
103 West 11th Street
Delta, Colorado 81416
RE: Western Slope Carbon, HavAc's Nest Mine Gob Disposal Pit
Dear Mr. Nordstrom:
This letter is in response to your May 11, 1989 letter regarding the coal
processing waste disposal area adjacent to the Delta County landfill site.
Rv virtue of the regulations under which our Division operates and the
requirements of the reclamation plan for the Hawk's Nest Mine, a portion of
the existing coal processing waste disposal area will need to be used by the
Division for disposal of coal refuse material and non-salvageable coal
stockpile material remaining at the East and West mine areas. Additionally,
it appears that some disposal of non-salvageable demolished structures and
facilities from the mine at the Delta County Landfill site will be necessary.
Due to the present configuration of the mine site and the approved backfillinq
and grading plan, only minor quantities of coal waste and demolished
structures can be buried on site without adversely affecting slope stability
and the ability of regraded areas to be successfully revegetated. Our present
schedule involves beginning reclamation work at the west mine area during the
latter Dart of July. Reclamation work at the east mine area should begin in
September or October of this year.
In regard to your question as to the flammability of the refuse material at
the disposal area, no specific analyses of the refuse could be located in the
Division's files. However, the Division's experience with coal processing and
development wastes at other mine sites indicates that the material should be
considered flammable and susceptible to spontaneous combustion if not disposed
of properly. Our regulations in general require that this type of material be
placed in horizontal lifts, compacted to within 90% of maximum dry density,
and covered with a minimum of 4 feet of non-toxic, non-combustible material.
The Division will be completing volumetric calculations of the remaining coal
materials at the east and west mine areas in order to determine the quantity
of material to be hauled from the mine to the disposal area. The volume of
demolished structures and facilities to be hauled to the landfill cannot be
accurately determined at the present time due to incomplete data regarding
salvageability/scrap value of steel structures and the extent to which other
types of demolished structures can be disposed of on site by burying or
burning.
215 Centennial Building, 1313 Sherman Street Denver, Colorado 80203-2273 Tel. [phone]