COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT 
WATER QUALITY CONTROL COMMISSION 
5 ccr 1002-33
CLASSIFICATIONS AND NUMERIC STANDARDS
FOR
UPPER COLORADO RIVER BASIN AND
NORTH PLATTE RIVER (PLANNING REGION 12)
REGULATION NO. 33
. . . .
33.6 	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:12

BASIN:  Upper Colorado River	Desig	Classifications	NUMERIC STANDARDS	TEMPORARY
MODIFICATIONS
AND
QUALIFIERS	

Stream Segment Description			PHYSICAL
and
BIOLOGICAL
	INORGANIC
mg/l	METALS
ug/l		
3.	Mainstem of the Colorado River from the outlet of Lake Granby to the confluence with Roaring Fork 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)
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ch)=WS
Mn(ac/ch)=TVS
Hg(ch)=0.01(tot)	Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac)=TVS
Zn(ch)=TVS(sc)	
Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	
4.	All tributaries to the Colorado River, including all wetlands, from the outlet of Lake Granby to the confluence with the Roaring Fork River, which are on National Forest lands, except for those tributaries included in Segments 1 and 2, and specific listings in Segments 8, 9 and 10a.		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=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)
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ch)=WS
Mn(ac/ch)=TVS
Hg(ch)=0.01(tot)	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.	
6a.	All tributaries to the Colorado River, including all wetlands, from the source to a point immediately above the confluence with the Blue River and Muddy Creek, which are not on National Forest lands, except for specific listings in Segments 1, 2, 4, 5, 6b, 6c, 8, 9 and 10a-c.		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=630/100ml	NH3(ac/ch)=TVS
Cl2(ac)=0.019
Cl2(ch)=0.011
CN=0.005	S=0.002
NO2=0.05
B=0.75
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)=WS
Mn(ac/ch)=TVS) 	Hg(ch)=0.01(tot
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.	
7a.	All tributaries to the Colorado River, including all wetlands, from a point immediately above the confluence with the Blue River and Muddy Creek to a point immediately below the confluence with the Roaring Fork River, which are not on National Forest lands, except for specific listings in Segment 7b, 7c and in the Blue River, Eagle River, and Roaring Fork River basins.		Aq Life Cold 1
Recreation N
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=630/100ml	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)
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ch)=WS
Mn(ac/ch)=TVS
Hg(ch)=0.01(tot)	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.	
7b.	Mainstem of Muddy Creek, including all tributaries and wetlands, from the outlet of Wolford Mountain Reservoir to the confluence with the Colorado River; mainstems of Rock Creek, Deep Creek, Sheephorn Creek, Sweetwater Creek and the Piney River, including all tributaries and wetlands, from their sources to their confluences with the Colorado River, which are not on National Forest lands.		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=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)
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ch)=WS(dis)
Mn(ac/ch)=TVS
Hg(ch)=0.01(tot)	Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac)=TVS
Zn(ch)=TVS(sc)	
Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	
8.	Mainstem of the Williams Fork River, including all tributaries and wetlands from the source to the confluence with the Colorado River, except for those tributaries listed in Segment 9.		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=126/100m	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(ch)=WS
Mn(ac/ch)=TVS
Hg(ch)=0.01(tot)	Ni(ac/ch)=TVS
Se(ac/ch)=TVS`
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac)=TVS
Zn(ch)=TVS(sc)	Point of compliance for Fe and Mn at Aspen Canyon Ranch well.

Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.
	
10a.	Mainstem of the Fraser River from the source to a point immediately below the Rendezvous Bridge.  All tributaries to the Fraser River, including wetlands, from the source to the confluence with the Colorado River, except for those tributaries included in Segment 9.		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=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(ch)=WS
Mn(ac/ch)=TVS
Hg(ch)=0.01(tot)	Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac)=TVS
Zn(ch)=TVS(sc)	
Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	
10b.	Mainstem of the Fraser River from a point immediately below the  Rendezvous Bridge to a point immediately below the Hammond Ditch.		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(ch)=WS
Mn(ac/ch)=TVS
Hg(ch)=0.01(tot)	Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac)=TVS
Zn(ch)=TVS(sc)	
Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	

REGION:12

BASIN:  Blue River	Desig	Classifications	NUMERIC STANDARDS	TEMPORARY
MODIFICATIONS
AND
QUALIFIERS	

Stream Segment Description			PHYSICAL
and
BIOLOGICAL
	INORGANIC
mg/l	METALS
ug/l		
1.	Mainstem of the Blue River from the source to Dillon Reservoir, except for specific listing in Segments 2a and 2b.		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=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)
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ch)=WS
Mn(ac/ch)=TVS
Hg(ch)=0.01(tot)	Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac)=TVS
Zn(ch)=TVS(sc)	
Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	
2b.	Mainstem of the Blue River from a point one half mile below Summit County Road 3 to the confluence with the Swan 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=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/ch)=1/2e(1.
  0166(ln(hard)‑3.132))
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)=WS
Mn(ac/ch)=TVS
Hg(ch)=0.01(tot)	Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac/ch)=e(0.9805(ln(hard)+1.402))	
Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	
3.	Dillon Reservoir and all lakes and reservoirs in the Blue River drainage above Dillon Reservoir, except for specific listings in Segment 21.		Aq Life Cold 1
Recreation E
Water Supply
Agriculture	T=TVS(CL,CLL)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)
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ch)=WS
Mn(ac/ch)=TVS
Hg(ch)=0.01(tot)	Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac/ch)=TVS	Special standards for Dillon Reservoir only: Total Phosphorus as P=0.0074 mg/l in the top 15 meters of the water column for the months of July, August, September & October.

Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	
4a.	All direct tributaries to Dillon Reservoir and all tributaries and wetlands in the Blue River drainage above Dillon Reservoir, except for specific listings in Segments 1, 2a, 2b, 4b, 5, 6, and 10-14.		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=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(ch)=WS
Mn(ac/ch)=TVS
Hg(ch)=0.01(tot)	Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac)=TVS
Zn(ch)=TVS(sc)	
Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	
8.	Mainstem of Keystone Gulch, including all tributaries and wetlands from the source to the confluence with the Snake River.  Mainstem of Chihuahua Creek including all tributaries, and wetlands from the source to the confluence with Peru Creek.  Mainstem of the North Fork of the Snake River, including all tributaries and wetlands from the source to the confluence with the Snake River.  Mainstem of Jones gulch, including all tributaries and wetlands from the source to the confluence with the Snake 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=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(ch)=WS
Mn(ac/ch)=TVS
Hg(ch)=0.01(tot)	Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac)=TVS
Zn(ch)=TVS(sc)	
Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	
14.	Mainstem of Tenmile Creek, including all tributaries and wetlands from a point immediately above the confluence with West Tenmile Creek to Dillon Reservoir, except for the specific listing in Segment 16.		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=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)
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ch)=WS
Mn(ac/ch)=TVS
Hg(ch)=0.01(tot)	Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac)=TVS
Zn(ch)=TVS(sc)
	
Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	

REGION:12

BASIN:  Eagle River	Desig	Classifications	NUMERIC STANDARDS	TEMPORARY
MODIFICATIONS
AND
QUALIFIERS	

Stream Segment Description			PHYSICAL
and
BIOLOGICAL
	INORGANIC
mg/l	METALS
ug/l		
1.	All tributaries and wetlands to the Eagle River system within the Gore Range ‑ Eagles Nest and Holy Cross Wilderness Area.	
OW1	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=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(ch)=WS
Mn(ac/ch)=TVS
Hg(ch)=0.01(tot)	Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac)=TVS
Zn(ch)=TVS(sc)	
Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	
	1  Consistent with the provisions of section 25‑8‑104 C.R.S. the OW designation shall not apply with respect to the Homestake Water Project of the Cities of Aurora and Colorado Springs.	
3.	All tributaries to the Eagle River, including wetlands, from the source to the compressor house bridge at Belden, except for the specific listing in Segment 4 and those waters included 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=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)
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ch)=WS
Mn(ac/ch)=TVS
Hg(ch)=0.01(tot)	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 Homestake Creek from the confluence of the East Fork to the confluence with the Eagle 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=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(ch)=WS
Mn(ac/ch)=TVS
Hg(ch)=0.01(tot)	Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac)=TVS
Zn(ch)=TVS(sc)	
Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	
5b.	Mainstem of the Eagle River from a point immediately above the Highway 24 Bridge near Tigiwon Road to a point immediately above the confluence with Martin Creek.	9/30/00 Baseline does not apply	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=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)=(1.101672-[ln(hardness)*(0.041838)])* e(0.7998 [ln (hardness)]-3.1725)
CrIII(ac)=50(Trec)
CrVI(ac/ch)=TVS
Cu(ac) = 0.96*e 0.9801[ln(hardness)]-1.5865
Cu(ch) = 0.96*e 0.5897[ln(hardness)]-0.4845	Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ch)=WS
Mn(ac/ch)=TVS
	Hg(ch)=0.01(tot)
Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
January 1 through April 30
Zn(ac) = 0.978*e 0.8537[ln(hardness)]+2.1302
Zn(ch) = 0.986*e 0.8537[ln(hardness)]+1.9593
May 1 through December 31
Zn(ac) = 0.978*e 0.8537[ln(hardness)]+1.4189
Zn(ch) = 0.986*e 0.8537[ln(hardness)]+1.2481	
Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	

REGION:12

BASIN:  Eagle River	Desig	Classifications	NUMERIC STANDARDS	TEMPORARY
MODIFICATIONS
AND
QUALIFIERS	

Stream Segment Description			PHYSICAL
and
BIOLOGICAL
	INORGANIC
mg/l	METALS
ug/l		
6.	All tributaries to the Eagle River, including all wetlands, from the compressor house bridge at Belden to a point immediately below the confluence with Lake Creek, except for the specific listings in Segments 1, 7a, 7b, 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
	NH 3(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(ch)=WS
Mn(ac/ch)=TVS
Hg(ch)=0.01(tot)	Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac)=TVS
Zn(ch)=TVS(sc)	
Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	
8.	Mainstem of Gore Creek from the confluence with Black Gore Creek to the confluence with the Eagle 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=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)
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ch)=WS
Mn(ac/ch)=TVS
Hg(ch)=0.01(tot)
	Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac)=TVS
Zn(ch)=TVS(sc)	Temporary Modification:
Temperature=”existing quality”

(Type iii) Expiration date of 12/31/2013.

Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.
	
9a.	Mainstem of the Eagle River from Gore Creek to a point immediately below the confluence with Rube 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=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)
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ch)=WS
Mn(ac/ch)=TVS
Hg(ch)=0.01(tot) 	Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac/ch)=TVS	Temporary Modification:
Temperature=”existing quality”

(Type iii) Expiration date of 12/31/2013.

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

9b.	Mainstem of the Eagle River from a point immediately below the confluence with Rube Creek to the confluence with the Colorado 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)
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	
Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ch)=WS
Mn(ac/ch)=TVS
Hg(ch)=0.01(tot) 	
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.	
10a.	All tributaries to the Eagle River, including all wetlands, from a point immediately below the confluence with Lake Creek to the confluence with the Colorado River, except for specific listings in Segments 10b, 11 and 12, and those waters included 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=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)
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ch)=WS
Mn(ac/ch)=TVS
Hg(ch)=0.01(tot)	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.	
10b.	Abrams Creek, including all tributaries and wetlands, from the source to the eastern boundary of the United States Bureau of Land Management lands.	
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=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)
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ch)=WS
Mn(ac/ch)=TVS
Hg(ch)=0.01(tot)	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:12

BASIN:  Roaring Fork River	Desig	Classifications	NUMERIC STANDARDS	TEMPORARY
MODIFICATIONS
AND
QUALIFIERS	

Stream Segment Description			PHYSICAL
and
BIOLOGICAL
	INORGANIC
mg/l	METALS
ug/l		
1.	All tributaries to the Roaring Fork River system, including all wetlands, within the Maroon Bells/Snowmass, Holy Cross, Raggeds, Collegiate Peaks  and Hunter/Fryingpan 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=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)
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ch)=WS
Mn(ac/ch)=TVS
Hg(ch)=0.01(tot)	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.	Mainstem of the Roaring Fork River, including all tributaries and wetlands, from the source to a point immediately below the confluence with Hunter Creek, except for those tributaries included 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=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(ch)=WS
Mn(ac/ch)=TVS
Hg(ch)=0.01(tot)	Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac)=TVS
Zn(ch)=TVS(sc)	
Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	
3a.	Mainstem of the Roaring Fork River, from a point immediately below the confluence with Hunter Creek, to a point immediately below the confluence with the Fryingpan River.  All tributaries to the Roaring Fork River, including wetlands, from a point immediately below the confluence with Hunter Creek to the confluence with the Colorado River, except for those tributaries included in Segment 1 and specific listings in Segments 3b-10.		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=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)
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ch)=WS
Mn(ac/ch)=TVS
Hg(ch)=0.01(tot)	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.	
6.	Mainstem of the Fryingpan River from the confluence with the North Fork to the confluence with the Roaring Fork 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=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)
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ch)=WS
Mn(ac/ch)=TVS
Hg(ch)=0.01(tot)	Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac)=TVS
Zn(ch)=TVS(sc)	
Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	
8.	Mainstem of the Crystal River, including all tributaries and wetlands, from the source to the confluence with the Roaring Fork River, except for specific listings in Segments 1, 9 and 10.		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=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)
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ch)=WS
Mn(ac/ch)=TVS
Hg(ch)=0.01(tot)	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.	Mainstem of Coal Creek including all tributaries and wetlands from the source to the confluence with the Crystal 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=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)
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ch)=WS
Mn(ac/ch)=TVS
Hg(ch)=0.01(tot)	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 Thompson Creek including all tributaries and wetlands from the source to the confluence with the Crystal 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=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)
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ch)=WS
Mn(ac/ch)=TVS
Hg(ch)=0.01(tot)	Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac)=TVS
Zn(ch)=TVS(sc)	
Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	

REGION:12

BASIN:  North Platte River	Desig	Classifications	NUMERIC STANDARDS	TEMPORARY
MODIFICATIONS
AND
QUALIFIERS	

Stream Segment Description			PHYSICAL
and
BIOLOGICAL
	INORGANIC
mg/l	METALS
ug/l		
4a.	All tributaries to the North Platte River system, including all wetlands, except for those tributaries included in Segment 1, and specific listings in Segments 4b, 6, 7a and 7b.		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=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)
Mn(ch)=WS
Mn(ac/ch)=TVS
Pb(ac/ch)=TVS
Hg(ch)=0.01(tot) 	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.	
4b. 	Mainstem of the Illinois River, including all tributaries and wetlands, from a point immediately below the confluence with Indian Creek to the confluence with the Michigan River except for specific listings in Segments 7a and 7b.  Mainstem of the Canadian River below 12E Road to the confluence with the North Platte River.  All tributaries which enter the mainstem of the Canadian River from the southwest side of the mainstem.		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)
Mn(ch)=WS
Mn(ac/ch)=TVS
Pb(ac/ch)=TVS
Hg(ch)=0.01(tot) 	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 Michigan River from the source to a point immediately below the confluence with the North Fork Michigan 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=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)
Mn(ch)=WS
Mn(ac/ch)=TVS
Pb(ac/ch)=TVS	Hg(ch)=0.01(tot)
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 Michigan River from a point immediately below the confluence with the North Fork Michigan River to the confluence with the North Platte River.		Aq Life Cold 1
Recreation N
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=630/100ml	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)
Mn(ch)=WS
Mn(ac/ch)=TVS
Pb(ac/ch)=TVS
Hg(ch)=0.01(tot)	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:12

BASIN:  Yampa River	Desig	Classifications	NUMERIC STANDARDS	TEMPORARY
MODIFICATIONS
AND
QUALIFIERS	

Stream Segment Description			PHYSICAL
and
BIOLOGICAL
	INORGANIC
mg/l	METALS
ug/l		
1a.	All tributaries to the Yampa River, including all wetlands, which are within the Mount Zirkel, Flat Tops and Sarvis Creek 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=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(ch)=WS
Mn(ac/ch)=TVS
Hg(ch)=0.01(tot)	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.	
2c. 	Mainstem of the Yampa River from a point immediately above the confluence with Oak Creek to a point immediately below the confluence with Elkhead Creek.		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)
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ch)=WS
Mn(ac/ch)=TVS
Hg(ch)=0.01(tot)	Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac)=TVS
Zn(ch)=TVS(sc)	
Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	

REGION:12

BASIN:  Yampa River	Desig	Classifications	NUMERIC STANDARDS	TEMPORARY
MODIFICATIONS
AND
QUALIFIERS	

Stream Segment Description			PHYSICAL
and
BIOLOGICAL
	INORGANIC
mg/l	METALS
ug/l		
3.	All tributaries to the Yampa River, including all wetlands, from the source to the confluence with Elk River, except for specific listings in Segments 4-8, 13a-f and 19.  Mainstem of the Bear River, including all tributaries and wetlands from the boundary of the Flat Tops Wilderness Area to the confluence with the Yampa 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=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(ch)=WS
Mn(ac/ch)=TVS
Hg(ch)=0.01(tot)	Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac)=TVS
Zn(ch)=TVS(sc)	
Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	
6.	Mainstem of Oak Creek, including all tributaries and wetlands, from the source to the point of discharge of the Oak Creek wastewater treatment plant.		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=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)
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ch)=WS
Mn(ac/ch)=TVS
Hg(ch)=0.01(tot)	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 Elk River including, all tributaries and wetlands, from the source to the confluence with the Yampa River, except for those tributaries included in Segment 1 and 20.		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=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(ch)=WS
Mn(ac/ch)=TVS
Hg(ch)=0.01(tot)	Ni(ac/ch)=TVS
Se(ac/ch)TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac)=TVS
Zn(ch)=TVS(sc)	
Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	
13a.	Mainstem of Trout Creek, including all tributaries and wetlands, from the source to the confluence with the Yampa River, which are not on National Forest lands, except for specific listings in Segments 13b, 13c and 13f.		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=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)
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ch)=WS
Mn(ac/ch)=TVS
Hg(ch)=0.01(tot)	Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac)=TVS
Zn(ch)=TVS(sc)	
Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	
13c.	Mainstem of Trout Creek from the headgate of Spruce Hill Ditch (approximately 2,500 feet north of where County Road 27 crosses Trout Creek) to its confluence with Fish Creek.  All tributaries to Trout Creek from the headgate of Spruce Hill Ditch (approximately 2,500 feet north of where County Road 27 crosses Trout Creek) to County Road 179 except for specific listings in 13b.		Aq Life Cold 1
Recreation E
Agriculture

June through February
Water Supply	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=100

June through February
NO3=10
Cl=250
SO4=WS	As(ac)=340
As(ch)=7.6(Trec)
Cd(ac)=TVS(tr)
Cd(ch)=TVS
CrIII(ac/ch)=TVS
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS

June through February
As(ch)=0.02(Trec)
CrIII(ac)=50(Trec)	Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ac/ch)=TVS
Hg(ch)=0.01(tot)

June through February
Fe(ch)=WS(dis)
Mn(ch)=WS	Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac/ch)=TVS
	
Temporary modification:
June through February
As(ch)=hybrid
Expiration date of 12/31/21.	
13f. 	Mainstem of Trout Creek, including all tributaries and wetlands, from a point immediately below its confluence with Fish Creek to the confluence with the Yampa 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)
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ch)=WS
Mn(ac/ch)=TVS
Hg(ch)=0.01(tot)	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.	

. . . .
33.50	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 33.6(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 Colorado River 3
Upper Colorado River 4
Upper Colorado River 6a
Upper Colorado River 7a
Upper Colorado River 7b
Upper Colorado River 8
Upper Colorado River 10a
Upper Colorado River 10b
Blue River 1
Blue River 2b
Blue River 3
Blue River 4a
Blue River 8
Blue River 14
Eagle River 1
Eagle River 3
Eagle River 4
Eagle River 5b
Eagle River 6
Eagle River 8
Eagle River 9a
Eagle River 9b
Eagle River 10a
Eagle River 10b
Roaring Fork 1
Roaring Fork 2
Roaring Fork 3a
Roaring Fork 6
Roaring Fork 8
Roaring Fork 9
Roaring Fork 10
North Platte River 4a
North Platte River 4b
North Platte River 5a
North Platte River 5b
Yampa River 1a
Yampa River 2c
Yampa River 3
Yampa River 6
Yampa River 8
Yampa River 13a
Yampa River 13c
Yampa River 13f
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