1987-12-01_PERMIT FILE - C1981017 ‎(94)‎

• Permit No: C1981017
• IBM Index Class Name: PERMIT FILE
• Doc Date: 12/1/1987
• Doc Name: Coal Refuse Facility Driainage Control Plan
• Section_Exhibit Name: Chapter II Attachment 5 to Appendix II-B-7 ‎(11-B-App. 7 Att.5)‎
• Media Type: D
• Archive: No

II
lying Mesaverde Formation outcrop north of the area at higher
elevations. The ridges , formed by Mancos Shale , are locally
covered by important accumulations of colluvial soils of un-
known thickness. A large landslide has been identified north-
east of the proposed waste disposal area.
The waste disposal area is bordered on the south side by
alluvial deposits of Coal Creek.
3. 0 GROUND WATER HYDROLOGY
It can be expected that ground water will be encountered
in two formations at or close to the proposed waste disposal
site :
o Ground water in Coal Creek alluvium. It is probable
that continuous ground water exists in the alluvium of Coal
Creek. As the Coal Creek alluvium is outside the area of
interest, no studies have been made on this ground water. Coal
Creek alluvium can be influenced by discharge of ground water
from the outwash sediments. The valley of Coal Creek is lower
than the outwash deposits north of it; the creek has locally
i eroded the outwash deposits so that a discharge from them
into the Coal Creek alluvium cannot be excluded.
o Ground water in outwash deposits. It is reasonable to
expect that ground water can be encountered in the outwash
ideposits in both east and west valleys. Geotechnical mapping
of the area above the east valley indicated the large land-
slide with numerous wet spots and the apparent presence of
ground water. This ground water will be discharged into the
east valley; ground water can be expected to exist there. The
west valley can be recharged by water from several creeks
observed in higher reaches of the valley.
No ground water has been observed in the bedrock forma-
tions. The ridges on both sides of the disposal area are dry,
and no springs have been observed there.
4. 0 GROUND WATER INVESTIGATION
A total of three monitoringwells were installed lled within
the project area to obtain baseline ground water data and to
enable continued monitoring of ground water elevations and
ground water quality.
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