PERMFILE137697

• Permit No: C1980007A
• IBM Index Class Name: Permit File
• Doc Date: 4/8/2005
• Doc Name: pages 2.05-157 to 2.05-267
• Section_Exhibit Name: 2.05 Operation and Reclamation Part 3
• Media Type: D
• Archive: Yes

West E!k Mrne
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Table 60 Wastewater Discharge Impacts on North Fork Gunnison River During
Low Flow Conditions
7-Day,10-Y r.
Low Flow 1-Day,10-Yr.
Low Flow
Stream flow (CFS) 32.5 25
Dilution Ratios
(Eflluen[Discharge10,000
gpd)
2100
1620
Water Quality Parameter
BOD Effluent' 30 30
(rnB~-) Incremental Change 0.014 0.018
TSS Effluent' 30 30
(tnP~L) Incremental Change 0.014 0.018
Background 137 137
NHS N Effluent I 1
(mg/L) Incremental Change .0001 .0001
Background 45 .45
StandardZ 0.905 0.905
NO, N Effluent 29 29
(mg/L) Incremental Change 0.014 0.018
Background 0.20 0.20
Standard 10.0 10.0
C I, Effluent' 0.5 0.5
(mg/L) Incremental Change .0002 .0003
Standard .003 .003
Fecal Coliform Effluent' 6000 6000
Colonies/ I OOmI Incremental Change 3 4
Background 18.8 18.8
Standard 2000 2000
t rvruta rertnu umn
2 Srarrdard Pot foul ammonia, derived from the mean annual pH value (7.8) and the maximum reported temperaurre value (66°F or 19°C) value
which results in an insveam unionized ammonia concentration of0.02 mg/L as N.
Table 61 contains projections of wastewater treatment plant discharges. These projections are
consistent with previously submitted projections with the exception of build-up schedules. The
build-up schedules are estimates which are dependent on coal sales and market conditions and
may change accordingly.
Planning and expansion of the treatment plant will occur according to state (Colorado
Department of Public Health and Environment [CDPHE]) regulations. The level of projected
future maximum discharge (0.04 mgd) is still small compared to the low flows in the North
Fork, and so should not significantly affect water quality of the river. In addition, effluent
2.05-208 RevrsedJun. 1995 PR06. Revised Nov. 1998 TR80: Revised Jan. l998 PR08