PERMFILE105530

• Permit No: C1982056
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: Exhibit 44 NPDES Permit No. CO-0042161
• Media Type: D
• Archive: No

APPENDIX A
WATER QUALITY ASSESSMENT
TWENTYMILE COAL COMPANY
Table A-1
Assessment Summary
Twentymile Coal Company Name of Facility
CO-0042161 CDPS number
Upper Colorado River Basin, Yampa River WBID -Stream Segment
Sub-Basin, Segment 13b
Mainstem of Foidel Creek, including all
tributaries and wetlands. Mainstem Fish
Creek, including all tributaries from County
Road 27 downstream to the confluence with
Trout Creek. Middle Creek and all
tributaries, from County Road 27 downstream
to the confluence with Trout Creek.
COUCYAI3B
Cold Water Aquatic Life Class 1 Classifications
Recreation Class 1
Agriculture
Undesignated Designation
I. Introduction
The water quality assessment (WQA) of Fish Creek neaz the Twentymile Coal Company was
conducted for the Colorado Department of Public Health and Environment (CDPHE), Water Quality
Control Division (WQCD). The WQA was prepazed to facilitate issuance ofthe Colorado Dischazge
Permit System (CDPS) permit for the Twentymile Coal Company, CDPS Permit No. 000042161,
and is intended to determine the assimilative capacities available to the Twentymile Coal Company
for pollutants found to be of concern.
Figure A-1 on the following page contains a map of the study area evaluated as part of this WQA.
Fish Creek flows through a heavily coal-mined region in the mountainous azeas of the State. The
character of the receiving waters is influenced by previously and actively mined azeas surrounding
the site and the arid climate of the region.
This WQA addresses the Twentymile Coal Company combined surface water and mine water
discharges from Outfall 001. Additionally, the contributions by the Seneca Coal Company
(000000221) and Fish Creek Tipple (000036684) to Fish Creek at locations downstream were
evaluated when determining the assimilative capacity available to this facility.
•
Appendix A Page 1 of 12