PERMFILE124948

• Permit No: C1992080A
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: Section 2.05 Operation and Reclamation Plan
• Media Type: D
• Archive: Yes

• be established will ultimately provide greater cover and erosion control than the native
pre-mine vegetation.
The Carbon Junction Mine will minimally impact both the quality and quantity of
ground and surface waters. A discussion of the probable hydrologic consequences of
mining is set forth below as well as in the CDMG findings document for the initial
approval of permit C-92-080. The CDMG discussion of probable hydrologic
consequences is incorporated by reference into this document. This discussion includes
a quantitative analysis of the impacts of the proposed operation on the existing ground
and surface water resources, both quantity and qua]ity impacts.
There are no regional aquifers that will be interrupted or impacted by the proposed
mining activity. Ground water in the area is found in discontinous lenses within
lenticular sandstones, fractures and in coal seams. Ground water analysis indicates that
the water found in the coal seams is of good quality and has no acid or toxic materials
in the analysis.
According to test data, little to no water will filtrate to the Pictured Cliff Sandstones,
and otherwise, the coals seams and perched water are expected to discharge to the
reclaimed pit. Overburden and refuse analysis indicate no acid or toxic materials aze
found in the materials. Sulfur materials in the refuse will be placed no less than 20 feet
• above the pit water level in reclamation although there is no available information
indicating the two to three percent (2 to 3%) sulfur in the reject is acid forming.
Regarding the concern for the lower Fruitland Formation and the Pictured Cliffs
Sandstone being a regional aquifer, the Division is referred to: Availabilityand
Chemical Characteristics of Groundwater in Central La Plata County. Colorado by
Robert E. Brogden and T.F. Giles, U. S. Geological Survey Water Resources
Investigations 76-69, prepared in cooperation with the Colorado Department of Natural
Resources, Division of Water Resources, Open File Report; Lakewood, Colorado;
May, 1976. This report maps the locations and summarizes water quality for 38 wells
in the Durango area. None of the wells investigated were completed in the referenced
formations. Additionally the formations are mentioned as potential aquifers, because
no wells completed in either formation could be ]orated by the authors. Mr. Carl
Hutchinson with the U.S.G.S. stated that the purpose of this open file report was to
supply the State Engineer with data on the various formations acting as aquifers
(personal communication February 6, 1983). The results of this report tend to confirm
the assertion that the Fruitland Formation and the Pictured Cliffs Sandstone are not
being utilized as aquifers in the Durango area (certainly not within 2 miles of the mine
site as State Engineer's well records indicate). Indeed, the basic premise that the
formations are aquifers in the Durango azea becomes suspect.

Technical Revision 08 (v 1.4) 5-33 Revised 9/1997