PERMFILE119809

• Permit No: C1981022A
• IBM Index Class Name: Permit File
• Doc Date: 3/21/2006
• Doc Name: NPDES Permit ‎(CO-000132)‎
• Section_Exhibit Name: Exhibit 2.03-E4 Part 3c
• Media Type: D
• Archive: Yes

Oxbow Mining WWTF Water Quality Assessment CO-0000132
DELTA
Elk Creek -
Bear Coal USGS
Outfa11001 - 09132500
LLC
State
- County
Lake/Pond/Ocean
- Street
-- Expressway
--Highway
t
LEGEND-
Figure A-i
Study Area
Sanborn Creek
Coal Outfalls
® Stream
Military Area
National Park
Other Park
Q City
--- County
Connec or 0 1 2 3 4 mi
Scale 1:174291 1 gg
~avera2e-true scale depends on monitor ~esolutionkm
Paoaia
of the
Source: US Census
TIGER Mapping Service
Based on WQCD general approaches, there aze no dischazges composed entirely of surface runoff
water evaluated in this assessment. This is because automatic discharges of surface runoffwater will
not occur during periods of critical low flow as surface runoffwater only occurs during precipitation
events, and any manual releases of surface runoff water dischazges from ponds will be required to
meet the assimilative capacities set forth in this WQA.
The ratio of the low flow of Sanborn Creek and Elk Creek to the Oxbow Mining, LLC WWTF
design flow is 0:1. No other facilities dischazge to these receiving waters, thus no other upstream or
downstream facilities had an impact on the assimilative capacities available to the Oxbow Mining,
LLC WWTF. However, due to lack of available dilution, analyses indicate that assimilative
capacities are extremely limited.
According to discussions with a representative from the State of Colorado's Division of Water
Resources, Division IV in Montrose, Sanborn Creek and Elk Creek have a low flow of zero.
Appendix A Page 2 of 10 Drag