COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT 
WATER QUALITY CONTROL COMMISSION 
5 CCR 1002-35
REGULATION NO. 35
CLASSIFICATIONS AND NUMERIC STANDARDS
FOR
GUNNISON AND LOWER DOLORES RIVER BASINS
. . . .
35.6 	TABLES
. . . .
(2)	Abbreviations:
. . . .
(d)	Temporary Modification for Water + Fish Chronic Arsenic Standard
(i)	The temporary modification for chronic arsenic standards applied to segments with an arsenic standard of 0.02 mg/l that has been set to protect the Water+Fish qualifier is listed in the temporary modification and qualifiers column as As(ch)=hybrid.
(ii)	For discharges existing on or before 6/1/2013, the temporary modification is:  As(ch)=current condition, expiring on 12/31/2021.
(iii)	For new or increased discharges commencing on or after 6/1/2013, the temporary modification is:  As(ch)=0.02-3.0 mg/l (Trec), expiring on 12/31/2021.
(a)	The first number in the range is the health-based water quality standard previously adopted by the Commission for the segment.
(b)	The second number in the range is a technology based value established by the Commission for the purpose of this temporary modification.
(c)	Control requirements, such as discharge permit effluent limitations, shall be established using the first number in the range as the ambient water quality target, provided that no effluent limitation shall require an “end-of-pipe” discharge level more restrictive than the second number in the range.
(3)	Table Value Standards
. . . .

REGION: 10

BASIN:  Upper Gunnison River Basin	Desig	Classifications	NUMERIC STANDARDS	TEMPORARY
MODIFICATIONS
AND
QUALIFIERS	
			PHYSICAL
and
BIOLOGICAL	INORGANIC
mg/l	METALS
ug/l		
Stream Segment Description							

1.	All tributaries to the Gunnison River, including and wetlands, within the La Garita, Powderhorn, West Elk, Collegiate Peaks, Maroon Bells, Fossil Ridge, or Uncompahgre Wilderness Areas.	
OW	
Aq Life Cold 1
Recreation E
Water Supply
Agriculture	
T=TVS(CS-I) oC
D.O.=6.0 mg/l
D.O.(sp)=7.0 mg/l
pH=6.5-9.0
E.Coli=126/100ml	
NH3(ac/ch)=TVS
Cl2(ac)=0.019
Cl2(ch)=0.011
CN=.005	
S=0.002
B=0.75
NO2=0.02
NO3=10
Cl=250
SO4=WS	
As(ac)=340
As(ch)=0.02(Trec)
Cd(ac)=TVS(tr)
Cd(ch)=TVS
CrIII(ac)=50(Trec)
CrIII(ch)=TVS
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	
Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ac/ch)=TVS
Mn(ch)=WS(dis)
Hg(ch)=0.01(tot)
Mo(ch)=160(Trec)
	
Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac/ch)=TVS	

Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	

2.	All tributaries and wetlands from North Beaver Creek to Meyers Gulch, from the West Elk Wilderness boundary to their confluences with Blue Mesa Reservoir, Morrow Point Reservoir, or the Gunnison River, excluding Steuben Creek, North Willow Creek, and Soap Creek. 	
OW	
Aq Life Cold 1
Recreation E
Water Supply
Agriculture	
T=TVS(CS-I) oC
D.O. = 6.0 mg/l
D.O. (sp)=7.0 mg/l
pH = 6.5-9.0
E.Coli=126/100ml	
NH3(ac/ch)=TVS
Cl2(ac)=0.019
Cl2(ch)=0.011
CN=.005	
S=0.002
B=0.75
NO2=0.02
NO3=10
Cl=250
SO4=WS	
As(ac)=340
As(ch)=0.02(Trec)
Cd(ac)=TVS(tr)
Cd(ch)=TVS
CrIII(ac)=50(Trec)
CrIII(ch)=TVS
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	
Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ac/ch)=TVS
Mn(ch)=WS(dis)
Hg(ch)=0.01(tot)
Mo(ch)=160(Trec)
	
Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac/ch)=TVS

Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	

4.	Mainstem of the Taylor River, including all tributaries and wetlands, from the source to the confluence with the Gunnison River except for those in Segment 1.	
	
Aq Life Cold 1
Recreation E
Water Supply
Agriculture	
T=TVS(CS-I) oC
D.O.=6.0 mg/l
D.O.(sp)=7.0 mg/l
pH=6.5-9.0
E.Coli=126/100ml	
NH3(ac/ch)=TVS
Cl2(ac)=0.019
Cl2(ch)=0.011
CN=.005	
S=0.002
B=0.75
NO2=0.05
NO3=10
Cl=250
SO4=WS	
As(ac)=340
As(ch)=0.02(Trec)
Cd(ac)=TVS(tr)
Cd(ch)=TVS
CrIII(ac)=50(Trec)
CrIII(ch)=TVS
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	
Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ac/ch)=TVS
Mn(ch)=WS(dis)
Hg(ch)=0.01(tot)
Mo(ch)=160(Trec)
	
Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac/ch)=TVS

Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	

5a.	Mainstem of the East River, including all tributaries and wetlands, from its sources to a point immediately above the confluence with the Slate River, except for Segment 1.	
	
Aq Life Cold 1
Recreation E
Water Supply
Agriculture	
T=TVS(CS-I) oC
D.O.=6.0 mg/l
D.O.(sp)=7.0 mg/l
pH=6.5-9.0
E.Coli=126/100ml	
NH3(ac/ch)=TVS
Cl2(ac)=0.019
Cl2(ch)=0.011
CN=.005	
S=0.002
B=0.75
NO2=0.05
NO3=10
Cl=250
SO4=WS	
As(ac)=340
As(ch)=0.02(Trec)
Cd(ac)=TVS(tr)
Cd(ch)=TVS
CrIII(ac)=50(Trec)
CrIII(ch)=TVS
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	
Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ac/ch)=TVS
Mn(ch)=WS(dis)
Hg(ch)=0.01(tot)
Mo(ch)=160(Trec)
	
Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac/ch)=TVS	

Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	

5b.	Mainstem of the East River from a point immediately above the Slate River to the confluence with the Gunnison River.	
	
Aq Life Cold 1
Recreation E
Water Supply
Agriculture	
T=TVS(CS-II) oC
D.O.=6.0 mg/l
D.O.(sp)=7.0 mg/l
pH=6.5-9.0
E.Coli=126/100ml	
NH3(ac/ch)=TVS
Cl2(ac)=0.019
Cl2(ch)=0.011
CN=0.005	
S=0.002
B=0.75
NO2=0.05
NO3=10
Cl=250
SO4=WS	
As(ac)=340
As(ch)=0.02(Trec)
Cd(ac)=TVS(tr)
Cd(ch)=TVS
CrIII(ac)=50(Trec)
CrIII(ch)=TVS
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	
Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ac/ch)=TVS
Mn(ch)=WS(dis)
Hg(ch)=0.01(tot)
Mo(ch)=160(Trec)
	
Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac/ch)=TVS	

Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	

 6b.	Cement Creek and all its tributaries and wetlands from the source to a point immediately above the confluence with Horse Basin Creek.	
	
Aq Life Cold 1
Recreation E
Water Supply
Agriculture	
T=TVS(CS-I) oC
D.O.=6.0 mg/l
D.O.(sp)=7.0 mg/l
pH=6.5-9.0
E.Coli=126/100ml	
NH3(ac/ch)=TVS
Cl2(ac)=0.019
Cl2(ch)=0.011
CN=.005	
S=0.002
B=0.75
NO2=0.05
NO3=10
Cl=250
SO4=WS	
As(ac)=340
As(ch)=0.02(Trec)
Cd(ac)=TVS(tr)
Cd(ch)=TVS
CrIII(ac)=50(Trec)
CrIII(ch)=TVS
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	
Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ac/ch)=TVS
Mn(ch)=WS(dis)
Hg(ch)=0.01(tot)
Mo(ch)=160(Trec)
	
Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac/ch)=TVS	

Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	

8.	Mainstem of the Slate River from a point immediately above the confluence with Coal Creek to the confluence with the East River.	
	
Aq Life Cold 1
Recreation E
Water Supply
Agriculture	
T=TVS(CS-I) oC
D.O.=6.0 mg/l
D.O.(sp)=7.0 mg/l
pH=6.5-9.0
E.Coli=126/100ml	
NH3(ac/ch)=TVS
Cl2(ac)=0.019
Cl2(ch)=0.011
CN=.005	
S=0.002
B=0.75
NO2=0.05
NO3=10 Cl=250
SO4=WS	
As(ac)=340
As(ch)=0.02(Trec)
Cd(ac)=TVS(tr)
Cd(ch)=TVS
CrIII(ac)=50(Trec)
CrIII(ch)=TVS
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	
Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ac/ch)=TVS
Mn(ch)=WS(dis)
Hg(ch)=0.01(tot)
Mo(ch)=160(Trec)
	
Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac/ch)=TVS	
Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	

9.	All tributaries and wetlands to the Slate River except for specific listings in Segments 1, 10a, 10b, 11, 12 and 13.	
	
Aq Life Cold 1
Recreation E
Water Supply
Agriculture	
T=TVS(CS-I) oC
D.O.=6.0 mg/l
D.O.(sp)=7.0 mg/l
pH=6.5-9.0
E.Coli=126/100ml	
NH3(ac/ch)=TVS
Cl2(ac)=0.019
Cl2(ch)=0.011
CN=.005	
S=0.002
B=0.75
NO2=0.05
NO3=10
Cl=250
SO4=WS	
As(ac)=340
As(ch)=0.02(Trec)
Cd(ac)=TVS(tr)
Cd(ch)=TVS
CrIII(ac)=50(Trec)
CrIII(ch)=TVS
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	
Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ac/ch)=TVS
Mn(ch)=WS(dis)
Hg(ch)=0.01(tot)
Mo(ch)=210(Trec)
	
Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac/ch)=TVS

Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	

12.	Mainstem of Coal Creek, including all tributaries and wetlands from a point immediately below the Crested Butte Water Supply intake which is above the confluence with the Mount Emmons/Red Lady Basin drainage to the confluence with the Slate River, with the exception of Wildcat Creek.	
	
Aq Life Cold 1
Recreation E
Water Supply
Agriculture	
T=TVS(CS-I) oC
D.O.=6.0 mg/l
D.O.(sp)=7.0 mg/l
pH=6.5-9.0
E.Coli=126/100ml	
NH3(ac/ch)=TVS
Cl2(ac)=0.019
Cl2(ch)=0.011
CN=.005	
S=0.002
B=0.75
NO2=0.05
NO3=10
Cl=250
SO4=WS	
As(ac)=340
As(ch)= 0.02(Trec)
Cd(ac)=TVS(tr)
Cd(ch)=TVS
CrIII(ac)=50(Trec)
CrIII(ch)=TVS
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	
Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ac/ch)=TVS
Mn(ch)=191(dis)
Hg(ch)=0.01(tot)
Mo(ch)=160(Trec)
Ni(ac/ch)=TVS
Se(ac/ch)=TVS	
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac/ch)=TVS	
Temporary Modifications:

Type B
Cd(ch)= 2.1                      Cu(ch)=current conditions
Zn(ch)= 440
Expiration date June 30, 2016

As(ch)=hybrid
Expiration date of 12/31/21.

14.	Mainstem of the Gunnison River from its inception at the confluence of the East and Taylor rivers to the inlet of Blue Mesa Reservoir.	
	
Aq Life Cold 1
Recreation E
Water Supply
Agriculture	
T=TVS(CS-II) oC
D.O.=6.0 mg/l
D.O.(sp)=7.0 mg/l
pH=6.5-9.0
E.Coli=126/100ml	
NH3(ac/ch)=TVS
Cl2(ac)=0.019
Cl2(ch)=0.011
CN=.005	
S=0.002
B=0.75
NO2=0.05
NO3=10
Cl=250
SO4=WS	
As(ac)=340
As(ch)=0.02(Trec)
Cd(ac)=TVS(tr)
Cd(ch)=TVS
CrIII(ac)=50(Trec)
CrIII(ch)=TVS
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	
Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ac/ch)=TVS
Mn(ch)=WS(dis)
Hg(ch)=0.01(tot)
Mo(ch)=160(Trec)
Ni(ac/ch)=TVS	
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac/ch)=TVS	

Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	

18a.	Mainstem of Tomichi Creek  and its wetlands from the source to the confluence with Porphyry Creek.	
	
Aq Life Cold 1
Recreation U
Water Supply
Agriculture	
T=TVS(CS-I) oC
D.O.=6.0 mg/l
D.O.(sp)=7.0 mg/l
pH=6.5-9.0
E.Coli=126/100ml	
NH3(ac/ch)=TVS
Cl2(ac)=0.019
Cl2(ch)=0.011
CN=.005	
S=0.002
B=0.75
NO2=0.05
NO3=10
Cl=250
SO4=WS	
As(ac)=340
As(ch)=0.02(Trec)
Cd(ac)=TVS(tr)
Cd(ch)=TVS
CrIII(ac)=50(Trec)
CrIII(ch)=TVS
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	
Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ac/ch)=TVS
Mn(ch)=WS(dis) 

Hg(ch)=0.01(tot)
Mo(ch)=160(Trec)
Ni(ac/ch)=TVS
Se (ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac/ch)=TVS	

Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	

18b.	 Mainstem of Tomichi Creek  and its wetlands from the confluence with Porphyry Creek to the confluence with the Gunnison River.	
	
Aq Life Cold 1
Recreation U
Water Supply
Agriculture	
T=TVS(CS-II) oC
D.O.=6.0 mg/l
D.O.(sp)=7.0 mg/l
pH=6.5-9.0
E.Coli=126/100ml	
NH3(ac/ch)=TVS
Cl2(ac)=0.019
Cl2(ch)=0.011
CN=0.005	
S=0.002
B=0.75
NO2=0.05
NO3=10
Cl=250
SO4=WS	
As(ac)=340
As(ch)=0.02(Trec)
Cd(ac)=TVS(tr)
Cd(ch)=TVS
CrIII(ac)=50(Trec)
CrIII(ch)=TVS
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	
Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ac/ch)=TVS
Mn(ch)=WS(dis) 
Hg(ch)=0.01(tot)
Mo(ch)=160(Trec)

Ni(ac/ch)=TVS
Se (ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac/ch)=TVS	

Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	

19.	All tributaries to Tomichi Creek, including wetlands, which are within the boundaries of the Gunnison National Forest, except for specific listings in Segments 20 through 24.  Mainstems of Barret, Hot Springs, Razor and Quartz Creeks from their sources to their confluences with Tomichi Creek.	
	
Aq Life Cold 1
Recreation U
Water Supply
Agriculture	
T=TVS(CS-I) oC
D.O.=6.0 mg/l
D.O.(sp)=7.0 mg/l
pH=6.5-9.0
E.Coli=126/100ml	
NH3(ac/ch)=TVS
Cl2(ac)=0.019
Cl2(ch)=0.011
CN=.005	
S=0.002
B=0.75
NO2=0.05
NO3=10
Cl=250
SO4=WS	
As(ac)=340
As(ch)=0.02(Trec)
Cd(ac)=TVS(tr)
Cd(ch)=TVS
CrIII(ac)=50(Trec)
CrIII(ch)=TVS
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	
Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ac/ch)=TVS
Mn(ch)=WS(dis) 
Hg(ch)=0.01(tot)
Mo(ch)=160(Trec)
	
Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac/ch)=TVS

Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	

21.	Mainstem of Marshall Creek, including all tributaries and wetlands, from the source to the confluence with Tomichi Creek, except for specific listings in Segment 20.	
	
Aq Life Cold 1
Recreation U
Water Supply
Agriculture	
T=TVS(CS-I) oC
D.O.=6.0 mg/l
D.O.(sp)=7.0 mg/l
pH=6.5-9.0
E.Coli=126/100ml	
NH3(ac/ch)=TVS
Cl2(ac)=0.019
Cl2(ch)=0.011
CN=.005	
S=0.002
B=0.75
NO2=0.05
NO3=10
Cl=250
SO4=WS	
As(ac)=340
As(ch)=0.02(Trec)
Cd(ac)=TVS(tr)
Cd(ch)=TVS
CrIII(ac)=50(Trec)
CrIII(ch)=TVS
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	
Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ac/ch)=TVS
Mn(ch)=WS(dis) 
Hg(ch)=0.01(tot)
Mo(ch)=160(Trec)
	
Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac/ch)=TVS	

Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	

22.	Mainstem of Gold Creek from Browns Gulch to the confluence with Quartz Creek.	
	
Aq Life Cold 1
Recreation E
Water Supply
Agriculture	
T=TVS(CS-I) oC
D.O.=6.0 mg/l
D.O.(sp)=7.0 mg/l
pH=6.5-9.0
E.Coli=126/100ml	
NH3(ac/ch)=TVS
Cl2(ac)=0.019
Cl2(ch)=0.011
CN=.005	
S=0.002
B=0.75
NO2=0.05
NO3=10
Cl=250
SO4=WS	
As(ac)=340
As(ch)=0.02(Trec)
Cd(ac)=TVS(tr)
Cd(ch)=TVS
CrIII(ac)=50(Trec)
CrIII(ch)=TVS
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	
Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ac/ch)=TVS
Mn(ch)=WS(dis) 
Hg(ch)=0.01(tot)
Mo(ch)=160(Trec)
	
Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac/ch)=TVS

Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	

26.	  All tributaries, including wetlands, which are tributary to the Gunnison River from County Road 32 to the inlet of Blue Mesa Reservoir, Blue Mesa Reservoir, Morrow Point Reservoir, Crystal Reservoir or the segments of the Gunnison River that interconnect those reservoirs, with the exception of Segments 1,2, 29a, 29b, and 30 through 32.	
	
Aq Life Cold 1
Recreation U
Water Supply
Agriculture	
T=TVS(CS-I) oC
D.O.=6.0 mg/l
D.O.(sp)=7.0 mg/l
pH=6.5-9.0
E.Coli=126/100ml	
NH3(ac/ch)=TVS
Cl2(ac)=0.019
Cl2(ch)=0.011
CN=.005	
S=0.002
B=0.75
NO2=0.05
NO3=10
Cl=250
SO4=WS	
As(ac)=340
As(ch)=0.02(Trec)
Cd(ac)=TVS(tr)
Cd(ch)=TVS
CrIII(ac)=50(Trec)
CrIII(ch)=TVS
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	
Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ac/ch)=TVS
Mn(ch)=WS(dis) 
Hg(ch)=0.01(tot)
Mo(ch)=160(Trec)
	
Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac/ch)=TVS	

Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	

29a.	  Mainstem of the Lake Fork of the Gunnison including all tributaries and wetlands, from the source to a point immediately above the confluence with Eaton Creek, except for the specific listing in Segments 1, 9b, 29b, 30, 31 and 32.  Cebolla Creek, including all tributaries and wetlands, from the source to the Hinsdale/Gunnison County line.  Powderhorn Creek, including all tributaries and wetlands, from the source to the confluence with Cebolla Creek.  	
	
Aq Life Cold 1
Recreation E
Water Supply
Agriculture	
T=TVS(CS-I) oC
D.O.=6.0 mg/l
D.O.(sp)=7.0 mg/l
pH=6.5-9.0
E.Coli=126/100ml	
NH3(ac/ch)=TVS
Cl2(ac)=0.019
Cl2(ch)=0.011
CN=.005	
S=0.002
B=0.75
NO2=0.05
NO3=10
Cl=250
SO4=WS	
As(ac)=340
As(ch)=0.02(Trec)
Cd(ac)=TVS(tr)
Cd(ch)=TVS
CrIII(ac)=50(Trec)
CrIII(ch)=TVS
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	
Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ac/ch)=TVS
Mn(ch)=WS(dis) 
Hg(ch)=0.01 (tot)
Mo(ch)=160(Trec)
	
Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac/ch)=TVS

Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	

30.	 Mainstem of Henson Creek, including all tributaries and wetlands, from the source to the confluence with the Lake Fork of the Gunnison, except for the specific listing in Segments 31 and 32.	
	
Aq Life Cold 1
Recreation E
Water Supply
Agriculture	
T=TVS(CS-I) oC
D.O.=6.0 mg/l
D.O.(sp)=7.0 mg/l
pH=6.5-9.0
E.Coli=126/100ml	
NH3(ac/ch)=TVS
Cl2(ac)=0.019
Cl2(ch)=0.011
CN=.005	
S=0.002
B=0.75
NO2=0.05
NO3=10
Cl=250
SO4=WS	
As(ac)=340
As(ch)=0.02(Trec)
Cd(ac)=TVS(tr)
Cd(ch)=TVS
CrIII(ch)=50(Trec)
CrIII(ch)=TVS
CrVI (ac/ch)=TVS
Cu (ac/ch)=TVS	
Fe(ch)=WS(dis)
Fe(ch)=1000 (Trec)
Pb(ac/ch)=TVS
Mn(ac/ch)=TVS
Mn(ch)=WS(dis) 
Hg(ch)=0.01(tot)
Mo(ch)=160(Trec)
	
Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac/ch)=TVS

Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	

REGION: 10

BASIN: North Fork of the Gunnison River	Desig	Classifications	NUMERIC STANDARDS	TEMPORARY
MODIFICATIONS
AND
QUALIFIERS	
			PHYSICAL
and
BIOLOGICAL	INORGANIC
mg/l	METALS
ug/l		
Stream Segment Description							

1.	All tributaries to North Fork of the Gunnison River, including all wetlands, within the West Elk or Raggeds Wilderness Areas.	OW	
Aq Life Cold 1
Recreation E
Water Supply
Agriculture	
T=TVS(CS-I) oC
D.O.=6.0 mg/l
D.O.(sp)=7.0 mg/l
pH=6.5-9.0
E.Coli=126/100ml	
NH3(ac/ch)=TVS
Cl2(ac)=0.019
Cl2(ch)=0.011
CN=.005	
S=0.002
B=0.75
NO2=0.05
NO3=10
Cl=250
SO4=WS	
As(ac)=340
As(ch)=0.02(Trec)
Cd(ac)=TVS(tr)
Cd(ch)=TVS
CrIII(ac)=50(Trec)
CrIII(ch)=TVS
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	
Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ac/ch)=TVS
Mn(ch)=WS(dis) 
Hg(ch)=0.01(tot)
Mo(ch)=160(Trec)
	
Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac/ch)=TVS
Zn(ch)=TVS(sc)	

Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	

2.	Mainstem of North Fork of the Gunnison River from its inception at the confluence of Muddy Creek and Coal Creek to the Black Bridge (41.75 Drive) above Paonia.		
Aq Life Cold 1
Recreation E
Water Supply
Agriculture	
T=TVS(CS-II) oC
D.O.=6.0 mg/l
D.O.(sp)=7.0 mg/l
pH=6.5-9.0
E.Coli=126/100ml	
NH3(ac/ch)=TVS
Cl2(ac)=0.019
Cl2(ch)=0.011
CN=.005	
S=0.002
B=0.75
NO2=0.05
NO3=10
Cl=250
SO4=WS	
As(ac)=340
As(ch)=0.02(Trec)
Cd(ac)=TVS(tr)
Cd(ch)=TVS
CrIII(ac)=50(Trec)
CrIII(ch)=TVS
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	
Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ac/ch)=TVS
Mn(ch)=WS(dis) 
Hg(ch)=0.01(tot)
Mo(ch)=160(Trec)
	
Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac/ch)=TVS
Zn(ch)=TVS(sc)	

Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.

4.	Muddy Creek, including all tributaries and wetlands, from the source to the confluence with Coal Creek. Coal Creek, including all tributaries and wetlands, from the source to the confluence with Muddy Creek.  All tributaries to the North Fork of the Gunnison from its inception at the confluence of Muddy Creek and Coal Creek to the confluence with the Gunnison River within national forest boundaries, except for the specific listing in Segment 1.	
	
Aq Life Cold 1
Recreation E
Water Supply
Agriculture	
T=TVS(CS-I) oC
D.O.=6.0 mg/l
D.O.(sp)=7.0 mg/l
pH=6.5-9.0
E.Coli=126/100ml
	
NH3(ac/ch)=TVS
Cl2(ac)=0.019
Cl2(ch)=0.011
CN=.005	
S=0.002
B=0.75
NO2=0.05
NO3=10
Cl=250
SO4=WS	
As(ac)=340
As(ch)=0.02(Trec)
Cd(ac)=TVS(tr)
Cd(ch)=TVS
CrIII(ac)=50(Trec)
CrIII(ch)=TVS
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	
Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ac/ch)=TVS
Mn(ch)=WS(dis) 
Hg(ch)=0.01(tot)
Mo(ch)=160(Trec)
Ni(ac/ch)=TVS	
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac/ch)=TVS
Zn(ch)=TVS(sc)	

Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	

5a.	Mainstems of Hubbard Creek, Terror Creek, Minnesota Creek, and Leroux Creek from the national forest boundary to their confluences with the North Fork of the Gunnison River; mainstem of Jay Creek from its source to its confluence with the North Fork of the Gunnison River.	
	
Aq Life Cold 1
Recreation P
Water Supply
Agriculture	
T=TVS(CS-I) oC
D.O.=6.0 mg/l
D.O.(sp)=7.0 mg/l
pH=6.5-9.0
E.Coli=205/100ml	
NH3(ac/ch)=TVS
Cl2(ac)=0.019
Cl2(ch)=0.011
CN=.005	
S=0.002
B=0.75
NO2=0.05
NO3=10
Cl=250
SO4=WS	
As(ac)=340
As(ch)=0.02(Trec)
Cd(ac)=TVS(tr)
Cd(ch)=TVS
CrIII(ac)=50(Trec)
CrIII(ch)=TVS
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	
Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ac/ch)=TVS
Mn(ch)=WS(dis) 
Hg(ch)=0.01(tot)
Mo(ch)=160(Trec)
Ni(ac/ch)=TVS	
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac/ch)=TVS
Zn(ch)=TVS(sc)	

Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	
5b  Mainstem of Roatcap Creek, including all tributaries and wetlands, from the source to the confluence with the North Fork of the Gunnison.		
Aq Life Cold 1
Recreation P
Water Supply
Agriculture	
T=TVS(CS-II) oC
D.O.=6.0 mg/l
D.O.(sp)=7.0 mg/l
pH=6.5-9.0
E.Coli=205/100ml	
NH3(ac/ch)=TVS
Cl2(ac)=0.019
Cl2(ch)=0.011
CN=0.005	
S=0.002
B=0.75
NO2=0.05
NO3=10
Cl=250
SO4=WS	
As(ac)=340
As(ch)=0.02(Trec)
Cd(ac)=TVS(tr)
Cd(ch)=TVS
CrIII(ac)=50(Trec)
CrIII(ch)=TVS
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	
Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ac/ch)=TVS
Mn(ch)=WS(dis) 
Hg(ch)=0.01(tot)
Mo(ch)=160(Trec)
Ni(ac/ch)=TVS	
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac/ch)=TVS

Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	
6b. 	Mainstem and all tributaries to Bear Creek and  Stevens Gulch.  All tributaries, including wetlands, to the North Fork of the Gunnison River that are north of the North Fork of the Gunnison River, from a point immediately above the confluence with Roatcap Creek to the confluence with the Gunnison River, and are not within national forest boundaries; all tributaries, including wetlands, to the North Fork of the Gunnison River that are south of the North Fork of the Gunnison River, from a point immediately above the confluence with Minnesota Creek to the confluence with the Gunnison River, and are not within national forest boundaries, excluding the specific listings in Segments 5a and 5b.

		
Aq Life Warm 2
Recreation P
Water Supply
Agriculture	
T=TVS(WS-III) oC
D.O.=5.0 mg/l
pH=6.5-9.0 E.Coli=205/100ml	
NH3(ac/ch)=TVSCl2(ac)=0.019
Cl2(ch)=0.011
CN=.005	
S=0.002
B=0.75
NO2=0.05
NO3=10
Cl=250
SO4=WS	
As(ac)=340
As(ch)=0.02(Trec)
Cd(ac/ch)=TVS
CrIII(ac)=50(Trec)
CrIII(ch)=TVS
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	
Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ac/ch)=TVS
Mn(ch)=WS(dis) 
Hg(ch)=0.01(tot)
Mo(ch)=160(Trec)
Ni(ac/ch)=TVS`	
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS
Zn(ac/ch)=TVS	
Water+Fish Standards

Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	

REGION: 10

BASIN: Uncompahgre River	Desig	Classifications	NUMERIC STANDARDS	TEMPORARY
MODIFICATIONS
AND
QUALIFIERS	
			PHYSICAL
and
BIOLOGICAL	INORGANIC
mg/l	METALS
ug/l		
Stream Segment Description							
3a.	Mainstem of the Uncompahgre River from a point immediately above the confluence with Red Mountain Creek to a point immediately above the confluence with Cascade Creek.	

Aq Life Cold 1
Recreation E
Water Supply
Agriculture	
T=TVS(CS-I) oC
D.O.=6.0 mg/l
D.O.(sp)=7.0 mg/l
pH=6.5-9.0
E.Coli=126/100ml	
NH3(ac/ch)=TVS
Cl2(ac)=0.019
Cl2(ch)=0.011
CN=.005	
S=0.002
B=0.75
NO2=0.05
NO3=10
Cl=250
SO4=WS	
As(ac)=340
As(ch)=0.02 (Trec)
Cd(ac)=TVS(tr)
Cd(ch)=TVS
CrIII(ac)=50(Trec)
CrIII(ch)=TVS
CrVI(ac/ch)=TVS	
Cu(ac/ch)=TVS
Fe(ch)=WS(dis)
Fe(ch)= 2296(Trec)
Pb(ac/ch)=TVS
Mn(ac/ch)=TVS
Mn(ch)=WS(dis)
Hg(ch)=0.01(Tot)
Mo(ch)=160(Trec)
	
Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac/ch)=TVS	

Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	

REGION: 10

BASIN: Lower Gunnison River	Desig	Classifications	NUMERIC STANDARDS	TEMPORARY
MODIFICATIONS
AND
QUALIFIERS	
			PHYSICAL
and
BIOLOGICAL	INORGANIC
mg/l	METALS
ug/l		
Stream Segment Description							

1.	Mainstem of the Gunnison River from the outlet of Crystal Reservoir to a point immediately above the confluence with the Uncompahgre River.		
Aq Life Cold 1
Recreation E
Water Supply
Agriculture	
T=TVS(CS-II) oC
D.O.=6.0 mg/l
D.O.(sp)=7.0 mg/l
pH=6.5-9.0
E.Coli=126/100ml	
NH3(ac/ch)=TVS
Cl2(ac)=0.019
Cl2(ch)=0.011
CN=.005	
S=0.002
B=0.75
NO2=0.05
NO3=10
Cl=250
SO4=WS	As(ac)=340
As(ch)=0.02(Trec)
Cd(ac)=TVS(tr)
Cd(ch)=TVS
CrIII(ac)=50(Trec)
CrIII(ch)=TVS
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	
Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ac/ch)=TVS
Mn(ch)=WS(dis) 
Mo(ch)=160(Trec)
Hg(ch)=0.01(Tot)	
Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac/ch)=TVS
Zn(ch)=TVS(sc)	

Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	

2.	Mainstem of the Gunnison River from a point immediately above the confluence with the Uncompahgre River to the confluence with the Colorado River.	
	
Aq Life  Warm 1
Recreation E
Water Supply
Agriculture	
T=TVS(WS-II) oC
D.O.=5.0 mg/l
pH=6.5-9.0
E.Coli=126/100ml	
NH3(ac/ch)=TVS
Cl2(ac)=0.019
Cl2(ch)=0.011
CN=.005	
S=0.002
B=0.75
NO2=0.05
NO3=10
Cl=250
SO4=480	As(ac)=340
As(ch)=0.02(Trec)
Cd(ac)=TVS(tr)
Cd(ch)=TVS
CrIII(ac)=50(Trec)
CrIII(ch)=TVS
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	
Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ac/ch)=TVS
Mn(ch)=WS(dis) 	
Hg(ch)=0.01(Tot)
Mo(ch)=160(Trec)
Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac/ch)=TVS	
Temporary Modification:
Type A
Se(ch)= current conditions
Expiration date of Dec. 31, 2017.

Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.

3.	All tributaries to the Gunnison River, including all wetlands, which are within national forest boundaries, from the outlet of Crystal Reservoir to the confluence with the Colorado River, except for specific listings in the North Fork Gunnison River sub-basin, Uncompahgre River sub-basins, and segments 10, 11a, 11b, and 12.	
	
Aq Life Cold 1
Recreation E
Water Supply
Agriculture	
T=TVS(CS-I) oC
D.O.=6.0 mg/l
D.O.(sp)=7.0 mg/l
pH=6.5-9.0
E.Coli=126/100ml	
NH3(ac/ch)=TVS
Cl2(ac)=0.019
Cl2(ch)=0.011
CN=.005	
S=0.002
B=0.75
NO2=0.05
NO3=10
Cl=250
SO4=WS	
As(ac)=340
As(ch)=0.02(Trec)
Cd(ac)=TVS(tr)
Cd(ch)=TVS
CrIII(ac)=50(Trec)
CrIII(ch)=TVS
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	
Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ac/ch)=TVS
Mn(ch)=WS(dis) 
Hg(ch)=0.01(Tot)
Mo(ch)=160(Trec)
	
Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac/ch)=TVS	

Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	

8.	Mainstem of Surface Creek and Kannah Creek, including all tributaries, from the national forest boundary to the point of diversion for public water supply.	

Aq Life Cold 1
Recreation E
Water Supply
Agriculture	
T=TVS(CS-I) oC
D.O.=6.0 mg/l
D.O.(sp)=7.0 mg/l
pH=6.5-9.0
E.Coli=126/100ml	
NH3(ac/ch)=TVS
Cl2(ac)=0.019
Cl2(ch)=0.011
CN=.005	
S=0.002
B=0.75
NO2=0.05
NO3=10
Cl=250
SO4=WS	
As(ac)=340
As(ch)=0.02(Trec)
Cd(ac)=TVS(tr)
Cd(ch)=TVS
CrIII(ac)=50(Trec)
CrIII(ch)=TVS
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	
Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ac/ch)=TVS
Mn(ch)=WS(dis) 
Mn(ch)=1000	
Hg(ch)=0.01(Tot)
Mo(ch)=160(Trec)
Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac/ch)=TVS
Zn(ch)=TVS(sc)	

Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	

REGION: 10

BASIN: San Miguel River	Desig	Classifications	NUMERIC STANDARDS	TEMPORARY
MODIFICATIONS
AND
QUALIFIERS	
			PHYSICAL
and
BIOLOGICAL	INORGANIC
mg/l	METALS
ug/l		
Stream Segment Description							

2.	All tributaries, including all wetlands, to the San Miguel River from its sources to a point immediately below the confluence of Leopard Creek, with the exceptions listed in Segments 1, 6a, 6b, 7 and 8.	
	
Aq Life Cold 1
Recreation E
Water Supply
Agriculture	
T=TVS(CS-I) oC
D.O.=6.0 mg/l
D.O.(sp)=7.0 mg/l
pH=6.5-9.0
E.Coli=126/100ml	
NH3(ac/ch)=TVS
Cl2(ac)=0.019
Cl2(ch)=0.011
CN=.005	
S=0.002
B=0.75
NO2=0.05
NO3=10
Cl=250
SO4=WS	
As(ac)=340
As(ch)=0.02(Trec)
Cd(ac)=TVS(tr)
Cd(ch)=TVS
CrIII(ac)=50(Trec)
CrIII(ch)=TVS
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	
Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ac/ch)=TVS
Mn(ch)=WS(dis) 
Hg(ch)=0.01(tot) Mo(ch)=160(Trec)
	
Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac/ch)=TVS
Zn(ch)=TVS(sc)	

Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	

4b.	Mainstem of the San Miguel River from a point immediately below the CC ditch to a point immediately below the confluence of Naturita Creek.	
	
Aq Life Warm 1
Recreation E
Water Supply
Agriculture	
March-Oct
  T(DM)=30.9 oC
  T(MWAT)=23.3 oC
Nov-Feb
  T(DM)=13.0 oC
  T(MWAT)=9.0 oC
D.O.= 5.0 mg/l
pH=6.5-9.0
E.Coli=126/100ml	
NH3(ac/ch)=TVS
Cl2(ac)=0.019
Cl2(ch)=0.011
CN=.005	
S=0.002
B=0.75
NO2=0.5
NO3=10
Cl=250
SO4=WS	
As(ac)=340
As(ch)=0.02(Trec)
Cd(ac/ch)=TVS
CrIII(ac)=50(Trec)
CrIII(ch)=TVS
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	
Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ac/ch)=TVS
Mn(ch)=WS(dis) 
Hg(ch)=0.01(tot) Mo(ch)=160(Trec)
	
Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac/ch)=TVS
Zn(ac/ch)=TVS	
Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	

7.	Mainstem of the Howard Fork and, all tributaries, and wetlands, from a point immediately below the confluence of Swamp Gulch to its confluence with the South Fork of the San Miguel River.	
	Aq Life Cold 1
Recreation E
Water Supply
Agriculture	
T=TVS(CS-I) oC
D.O.=6.0 mg/l
D.O.(sp)=7.0 mg/l
pH=6.5-9.0
E.Coli=126/100ml	
NH3(ac/ch)=TVS
Cl2(ac)=0.019
Cl2(ch)=0.011
CN=.005	
S=0.002
B=0.75
NO2=0.05
NO3=10
Cl=250
SO4=WS
	
As(ac)=340
As(ch)= 0.02(Trec)
Cd(ac)=TVS(tr)
Cd(ch)=TVS
CrIII(ac)=50(Trec)
CrIII(ch)=TVS
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	
Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ac/ch)=TVS
Mn(ch)=WS(dis) 
Hg(ch)=0.01(tot)
Mo(ch)=160(Trec) Ni(ac/ch)=TVS
Se(ac/ch)=TVS	
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac/ch)=TVS	

Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	
9.	All tributaries to the San Miguel River, including all wetlands from a point immediately below the confluence of Leopard Creek to the Dolores River that are within the boundaries of the Uncompahgre National Forest.	
	
Aq Life Cold 1
Recreation E
Water Supply
Agriculture	
T=TVS(CS-I) oC
D.O.=6.0 mg/l
D.O.(sp)=7.0 mg/l
pH=6.5-9.0
E.Coli=126/100ml	
NH3(ac/ch)=TVS
Cl2(ac)=0.019
Cl2(ch)=0.011
CN=.005	
S=0.002
B=0.75
NO2=0.05
NO3=10
Cl=250
SO4=WS	
As(ac)=340
As(ch)=0.02(Trec)
Cd(ac)=TVS(tr)
Cd(ch)=TVS
CrIII(ac)=50(Trec)
CrIII(ch)=TVS
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	
Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ac/ch)=TVS
Mn(ch)=WS(dis) 
Hg(ch)=0.01(tot) Mo(ch)=160(Trec)
	
Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac/ch)=TVS	

Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	

10.	Mainstem of Naturita Creek from the point it exits the Uncompahgre National Forest at the most downstream boundary to its confluence with the San Miguel River.  Mainstem of Tabeguache Creek from its source to the confluence with the San Miguel River.	
	
Aq Life Cold 1
Recreation E
Water Supply
Agriculture	
T=TVS(CS-II) oC
D.O.=6.0 mg/l
D.O.(sp)=7.0 mg/l
pH=6.5-9.0
E.Coli=126/100ml	
NH3(ac/ch)=TVS
Cl2(ac)=0.019
Cl2(ch)=0.011
CN=.005	
S=0.002
B=0.75
NO2=0.05
NO3=10
Cl=250
SO4=WS	
As(ac)=340
As(ch)=0.02(Trec)
Cd(ac)=TVS(tr)
Cd(ch)=TVS
CrIII(ac)=50(Trec)
CrIII(ch)=TVS
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	
Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ch)=75 
Mn(ac/ch)=TVS
Hg(ch)=0.01(tot) Mo(ch)=160(Trec)
	
Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac/ch)=TVS	

Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	

12a.	All tributaries and wetlands to the San Miguel River from a point immediately below the confluence of Leopard Creek to a point immediately above Naturita Creek with the exceptions listed in Segments 9, 10, 11a, and 11b.	

Aq Life Cold 2
Recreation E
Water Supply
Agriculture	
T=TVS(CS-II) oC
D.O.=6.0 mg/l
D.O.(sp)=7.0 mg/l
pH=6.5-9.0
E.Coli=126/100ml	
NH3(ac/ch)=TVS
Cl2(ac)=0.019
Cl2(ch)=0.011
CN=.005	
S=0.002
B=0.75
NO2=0.05
NO3=10
Cl=250
SO4=WS	
As(ac)=340
As(ch)=0.02(Trec)
Cd(ac)=TVS(tr)
Cd(ch)=TVS
CrIII(ac)=50(Trec)
CrIII(ch)=TVS
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	
Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ac/ch)=TVS
Mn(ch)=WS(dis)
Hg(ch)=0.01(tot) Mo(ch)=160(Trec)
	
Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
U(ac)=TVS
U(ch)=16.8-301(Trec)
Zn(ac/ch)=TVS	
Water + Fish Standards
Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.

12b.	All tributaries and wetlands to the San Miguel River from a point immediately above Naturita Creek to the confluence with the Dolores River, excluding the listings in Segments 9, 10, 11a, and 11b.	

Aq Life Cold 2
Recreation E
Water Supply
Agriculture	
T=TVS(CS-II) oC
D.O.=6.0 mg/l
D.O.(sp)=7.0 mg/l
pH=6.5-9.0
E.Coli=126/100ml	
NH3(ac/ch)=TVS
Cl2(ac)=0.019
Cl2(ch)=0.011
CN=0.005	
S=0.002
B=0.75
NO2=0.05
NO3=10
Cl=250
SO4=WS	
As(ac)=340
As(ch)=0.02(Trec)
Cd(ac)=TVS(tr)
Cd(ch)=TVS
CrIII(ac)=50(Trec)
CrIII(ch)=TVS
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	
Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ac/ch)=TVS
Mn(ch)=WS(dis)
Hg(ch)=0.01(tot) Mo(ch)=160(Trec)
Ni(ac/ch)=TVS
	
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
U(ac)=TVS
U(ch)=16.8-301(Trec)
Zn(ac/ch)=TVS	
Water + Fish Standards
Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.

REGION: 10

BASIN: Lower Dolores River	Desig	Classifications	NUMERIC STANDARDS	TEMPORARY
MODIFICATIONS
AND
QUALIFIERS	
			PHYSICAL
and
BIOLOGICAL	INORGANIC
mg/l	METALS
ug/l		
Stream Segment Description							

1b.	 Mainstem of the Dolores River from a point immediately above the confluence with Big Canyon Creek near Dove Creek to a point immediately above the Highway 141 road crossing near Slick Rock.		
Aq Life Cold 1
Recreation E
Water Supply
Agriculture	
Mar 23-Oct 31
  T(DM)=27.6 oC
 T(MWAT)=24.7 oC
Nov 1- Mar 22
T(DM)=13.0 oC  
T(MWAT)=9.1 oC
 D.O.=6.0 mg/l
D.O.(sp)=7.0 mg/l
pH=6.5-9.0
E.Coli=126/100ml	
NH3(ac/ch)=TVS
Cl2(ac)=0.019
Cl2(ch)=0.011
CN=0.005	
S=0.002
B=0.75
NO2=0.05
NO3=10
Cl=250
SO4=WS	
As(ac)=340
As(ch)=0.02(Trec)
Cd(ac)=TVS(tr)
Cd(ch)=TVS
CrIII(ac)=50(Trec)
CrIII(ch)=TVS
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	
Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ac/ch)=TVS
Mn(ch)=WS(dis)
Hg(ch)=0.01(tot) Mo(ch)=160(Trec)
	
Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
U(ac)=TVS
U(ch)=16.8-301(Trec)
Zn(ac/ch)=TVS	

Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	

5.	Mainstem of West Creek from the source to the confluence with the Dolores River. Roc Creek including all tributaries and wetlands from the Manti-La Sal National Forest boundary to the confluence with the Dolores River.  La Sal Creek, including all tributaries and wetlands, from the Utah/Colorado border to the confluence with the Dolores River. Mesa Creek, including all tributaries and wetlands, from the Uncompahgre National Forest boundary to the confluence with the Dolores River.		
Aq Life Cold 1
Recreation E
Water Supply
Agriculture	
T=TVS(CS-II) oC
D.O.=6.0 mg/l
D.O.(sp)=7.0 mg/l
pH=6.5-9.0
E.Coli=126/100ml	
NH3(ac/ch)=TVS
Cl2(ac)=0.019
Cl2(ch)=0.011
CN=.005	
S=0.002
B=0.75
NO2=0.05
NO3=10
Cl=250
SO4=WS	
As(ac)=340
As(ch)=0.02(Trec)
Cd(ac)=TVS(tr)
Cd(ch)=TVS
CrIII(ac)=50(Trec)
CrIII(ch)=TVS
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	
Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ac/ch)=TVS
Mn(ch)=WS(dis)
Hg(ch)=0.01(tot) Mo(ch)=160(Trec)
	
Ni(ac/ch)=TVS
Se(ac/ch)= TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
U(ac)=TVS
U(ch)=16.8-301(Trec)
Zn(ac/ch)=TVS	

Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	

. . . .
35.36	STATEMENT OF BASIS SPECIFIC STATUTORY AUTHORITY AND PURPOSE APRIL 8, 2013 RULEMAKING; FINAL ACTION MAY 13, 2013 EFFECTIVE DATE SEPTEMBER 30, 2013
The provisions of C.R S. 25-8-202(1)(a), (b) and (2); 25-8-203; 25-8-204; and 25-8-402; provide the specific statutory authority for adoption of these regulatory amendments.  The Commission also adopted in compliance with 24-4-103(4) C.R.S. the following statement of basis and purpose.
BASIS AND PURPOSE
In August of 2005, the Commission adopted revisions to the Basic Standards and Methodologies for Surface Waters (Regulation #31) to add a Water + Fish (W+F) table value standard for chronic arsenic of 0.02 micrograms per liter (μg/L). W+F standards are numeric human health-based water quality standards that are calculated protective values that take into account the combined exposure from the pollutant in drinking water and the pollutant accumulated in fish flesh. This criterion automatically went into effect for Aquatic Life Class 1 waters which also have a Domestic Water Supply use, when the changes to the Basic Standards became effective.  It was also adopted on a segment by segment basis for Aquatic Life class 2 waters with Domestic Water Supply where the Commission determined there are fish of a catchable size of species that are normally consumed.  Because of the complicated nature of the arsenic standards, specific values were added to the basin tables in the basin hearings between 2006 and 2009.
In this hearing, the Commission adopted temporary modifications for W+F chronic arsenic where a permitted discharger with a water quality–based effluent limit compliance problem exists. The adopted temporary modification is listed in the regulation tables as “As(ch)=hybrid”. An explanation of the temporary modification and its expected implementation into control requirements, such as Colorado Discharge Permit System (CDPS) effluent limitations, is described in 35.6(2)(d). The temporary modification was established by the Commission to allow for a temporarily less stringent application of the chronic arsenic standard in control requirements for both existing discharges and new or increased discharges. 
For discharges existing on or before 6/1/2013, the temporary modification adopted for W+F chronic arsenic is “current condition”, expiring on 12/31/2021. The Commission intends that, when implementing the temporary modification of “current condition” in a CDPS permit, the Division will assess the current effluent quality, recognizing that it changes over time due to variability in treatment facility removal efficiency and influent loading from natural or anthropogenic sources, and due to changes in the influent flow and concentration over time. Maintaining the current condition will include maintaining permitted total arsenic loading to a treatment facility from arsenic contributors at the levels existing on the effective date of the temporary modification, while expressly allowing for variability in such loading due to changes in effluent quality as described above and due to changes in the influent flow and concentration over time within the permitted design flow of that facility. The Commission understands that the Division's past practice implementing this requirement in permits has been through reporting regarding the arsenic loading to the facility, and not through numeric effluent limitations. The Commission intends that the Division will continue this practice. For facilities that lack enough representative data to quantify arsenic loading, the permittee may satisfy reporting requirements through narrative descriptions of potential sources of arsenic. No permit action shall be approved that allows an increase in permitted total arsenic loading to a treatment facility. The expiration date of the temporary modification was set at 12/31/21 to allow for CDPS permits that are issued prior to the effective date of anticipated changes to the chronic arsenic standard in the 2016 Basic Standards Rulemaking to not have the temporary modification expire within the term of a permit. The Commission adopted this temporary modification to allow time for the Division, dischargers and stakeholders to continue a workgroup process to resolve the uncertainty regarding the appropriateness of the W+F chronic arsenic standard of 0.02 μg/L with respect to a technologically feasible level of treatment. 
For new or increased discharges that commence on or after 6/1/2013, the temporary modification adopted is As(ch) = 0.02–3.0 μg/L (Trec), expiring on 12/31/2021. The Commission decided that since the technologically achievable arsenic level is less stringent than the calculated W+F criterion, the temporary modification for new or increased discharges will be a range of 0.02-3.0 μg/L. The first number in the range is the health-based value, based on the Commission’s established methodology for human health-based standards that protect against the combined exposure of drinking water and eating fish. The second number in the range is the Commission’s initial determination of a technologically achievable value for arsenic, set at 3.0 μg/L. Control requirements, such as discharge permits effluent limitations, shall be established using the first number in the range as the ambient water quality target, provided that no effluent limitation shall require an “end of pipe” discharge level more restrictive than the second number in the range during the effective period for this temporary modification. The expiration date of the temporary modification was set at 12/31/21 to allow for CDPS permits that are issued prior to the effective date of anticipated changes to the chronic arsenic standard in the 2016 Basic Standards Rulemaking to not have the temporary modification expire within the term of a permit. The Commission adopted this temporary modification to allow time for the Division, dischargers and stakeholders to continue a workgroup process to resolve the uncertainty regarding the appropriateness of the W+F chronic arsenic standard of 0.02 μg/L with respect to a technologically feasible level of treatment. 
The technologically feasible level of 3.0 μg/L for arsenic is based upon testimony heard by the Commission at the December 13, 2011 Emergency Revisions to Regulation #38. At the December 13, 2011 hearing, the Commission determined, as a practical manner, that 3.0 μg/L is the lowest level that is technologically achievable for common types of water treatment facilities. At the April 8, 2013 Rulemaking, the Commission heard testimony that concurred with the finding from December 13, 2011 that an initial reasonable  lower limit of treatment technology for arsenic is 3.0 μg/L, pending further investigation by the Division, dischargers and stakeholders. The Division intends to address the uncertainty of the W+F chronic arsenic standard with respect to a technologically feasible level of treatment through a continued workgroup process, and propose a revised W+F chronic arsenic standards as part of the 2016 Basic Standards Rulemaking Hearing
Temporary modifications were adopted on the following segments. The segments identified have the previously adopted W+F chronic arsenic standard of 0.02 μg/L and an identified CDPS permit or permits that discharge immediately to or directly above the identified segment. 
Upper Gunnison River Basin 1
Upper Gunnison River Basin 2
Upper Gunnison River Basin 4
Upper Gunnison River Basin 5a
Upper Gunnison River Basin 5b
Upper Gunnison River Basin 6b
Upper Gunnison River Basin 8
Upper Gunnison River Basin 9
Upper Gunnison River Basin 12
Upper Gunnison River Basin 14
Upper Gunnison River Basin 18a
Upper Gunnison River Basin 18b
Upper Gunnison River Basin 19
Upper Gunnison River Basin 21
Upper Gunnison River Basin 22
Upper Gunnison River Basin 26
Upper Gunnison River Basin 29a
Upper Gunnison River Basin 30
North Fork of the Gunnison River 1
North Fork of the Gunnison River 2
North Fork of the Gunnison River 4
North Fork of the Gunnison River 5a
North Fork of the Gunnison River 5b
North Fork of the Gunnison River 6b
Uncompahgre River 3a
Lower Gunnison River 1
Lower Gunnison River 2
Lower Gunnison River 3
Lower Gunnison River 8
San Miguel River 2
San Miguel River 4b
San Miguel River 7
San Miguel River 9
San Miguel River 10
San Miguel River 12a
San Miguel River 12b
Lower Dolores River 1b
Lower Dolores River 5
PARTIES TO THE RULEMAKING HEARING
1.	Colorado Mining Association
2.	Union Gold, Inc.
3.	Colorado Department of Transportation
4.	City of Colorado Springs and Colorado Springs Utilities
5.	Town of Crested Butte
6.	Mountain Coal Company
7.	Centennial Water and Sanitation District
8.	MillerCoors, LLC
9.	Plum Creek Wastewater Authority
10.	Tri-State Generation & Transmission Association
11.	Climax Molybdenum Company
12.	Littleton/Englewood Wastewater Treatment Plant
13.	Eagle River Water and Sanitation District
14.	City of Boulder
15.	City and County of Denver
16.	Parker Water and Sanitation District
17.	U.S. Energy Corp.
18.	U.S. Environmental Protection Agency
19.	City of Greeley