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
. . . .
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							

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	
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)
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)
	
Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac/ch)=TVS	
Temporary Modification:
Cd(ch)=0.4
Expiration date of 3/31/2013.	

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
Agriculture	
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=100	
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	
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
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 Modifications:
Cd(ch)=2.3
Zn(ch)= 518
Expiration date of 3/31/2013.	

16.	Mainstem of Ohio Creek, including all tributaries, lakes,  reservoirs, and wetlands, from the sources to the confluence with the Gunnison River with the exception of Segment 2.	
	
Aq Life Cold 1
Recreation U
Water Supply
Agriculture	
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)
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)
	
Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac)=TVS
Zn(ch)=TVS(sc)	
Temporay Modification:
Zn(ch)= 11.9
Expiration date 3/31/2013.	

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							

3.	Mainstem of North Fork of the Gunnison River from the Black Bridge (41.75 Drive) above Paonia to the confluence with the Gunnison River.	
	
Aq Life Cold 1
Agriculture
Oct. 1 to March 31
Recreation N
April 1 to Sept. 30
Recreation E
	
D.O.=6.0 mg/l
D.O.(sp)=7.0 mg/l
pH=6.5-9.0
Oct. 1 to March 31
E.Coli=630/100ml

April 1 to Sept. 30
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=100	
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	
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
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:
Se(ch)=5.7 Expiration date 3/31/2013.	

5.	Mainstems of Hubbard Creek, Terror Creek, Minnesota Creek, and Leroux Creek from their boundary with national forest land 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; mainstem of Roatcap Creek including all tributaries, wetlands, lakes and reservoirs, from its source to its confluence with the North Fork of the Gunnison.	
	
Aq Life Cold 1
Recreation P
Water Supply
Agriculture	
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)
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)
Ni(ac/ch)=TVS	
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac/ch)=TVS	
Temporary Modification: Se(ch)=existing ambient quality
Expiration date of  3/31/2013.	
6b.	Mainstem and all tributaries to Bear Creek, Reynolds Creek, Bell Creek, McDonald Creek, Cottonwood Creek, Love Gulch, Cow Creek, Dever Creek, German Creek, Miller Creek, Stevens Gulch, Big Gulch, Stingley Gulch and Alum Gulch including lakes, reservoirs, and wetlands which are not on national forest lands from their source to the North Fork of the Gunnison River.	UP	Aq Life Warm 2
Recreation P
Water Supply
Agriculture	D.O.=5.0 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(ac)=10
Cl(ch)=250
SO4=WS	As(ac)=340
As(ch)=0.02(Trec)
Cd(ac/ch)=TVS
CrIII(ac)=50(Trec)
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	Fe(ch)=WS(dis)
Fe(ch)=1000(Trec)
Mn(ac/ch)=TVS
Mn(ch)=WS(dis)
Hg(ch)=0.01(tot)
Ni(ac/ch)=TVS	Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS
Zn(ac/ch)=TVS	Temporary Modifications:
Fe(ch)(Trec)=existing ambient quality
Se(ch)=existing ambient quality
Expiration date of 
3/31/2013
Water+Fish Standards	

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 the Highway 90 bridge at Montrose.	

Aq Life Cold 1
Recreation E
Water Supply
Agriculture	
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/ch)=TVS
CrVI(ac/ch)=TVS	
Cu(ac/ch)=TVS
Fe(ch)=WS(dis)
Fe(ch)=1500(Trec)
Pb(ac/ch)=TVS
Mn(ac/ch)=TVS
Mn(ch)=WS(dis)
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 Modifications:
Cd(ch)=1.1
Fe(Trec)=1673
Expiration date of 3/31/2013.	

4b.	Mainstem of the Uncompahgre River from La Salle Road to Confluence Park.	

UP	
Aq Life Warm 2
Recreation N
Agriculture	
D.O.=5.0 mg/l
pH=6.5-9.0
E.Coli=630/100ml	
NH3(ac/ch)=TVS
Cl2(ac)=0.019
Cl2(ch)=0.011
CN=.005	
S=0.002
B=0.75
NO2=0.5
NO3=100
	
As(ac)=340
As(ch)=100(Trec)
Cd(ac/ch)=TVS
CrIII(ac/ch)=TVS
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	
Fe(ch)=2250(Trec)
Pb(ac/ch)=TVS
Mn(ac/ch)=TVS
Hg(ch)=0.01(Tot)
Ni(ac/ch)=TVS	
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS
Zn(ac/ch)=TVS	
Temporary Modification:
Se(ch)=20
Expiration date of 3/31/2013.	

12.	All tributaries to the Uncompahgre River, including all wetlands, lakes and reservoirs, from the South Canal near Uncompahgre to the confluence with the Gunnison River, except for specific listings in Segments 13, 14,  15a and 15b.	

	UP	
Aq Life Warm 2
Recreation N
Agriculture	
D.O.=5.0 mg/l
pH=6.5-9.0
E.Coli=630/100ml	
NH3(ac/ch)=TVS
Cl2(ac)=0.019
Cl2(ch)=0.011
CN=.005	
S=0.002
B=0.75
NO2=0.05 NO3=100
	
As(ac)=340
As(ch)=100(Trec)
Cd(ac/ch)=TVS
CrIII(ac/ch)=TVS
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	
Fe(ch)=1200 (Trec)
Pb(ac/ch)=TVS
Mn(ac/ch)=TVS
Hg(ch)=0.01(Tot)
Ni(ac/ch)=TVS	
Se(ac/ch)=TVS
Ag(ac/ch)=TVS
Zn(ac/ch)=TVS	
Temporary modification:
Se(ch)=existing ambient quality.
Expiration date of 3/31/2013.	

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							

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	
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=480	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(ac/ch)=TVS
Mn(ch)=WS(dis) 	
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:
Se(ch)=8.4
Expiration date of 3/31/2013.	

4a.	All tributaries to the Gunnison River, including all wetlands which are not on national forest lands, from the outlet of Crystal Reservoir to the confluence with the Colorado River, except for specific listings in the North Fork and Uncompahgre River subbasins and in Segments 3, 4b, 4c, 5  through 10, 12 and 13.	

UP	
Aq Life Warm 2
Recreation N
Water Supply
Agriculture	
D.O.=5.0 mg/l
pH=6.5-9.0
E.Coli=630/100ml

NH3(ac/ch)=TVS
Cl2(ac)=0.019
Cl2(ch)=0.011
CN=.005	
S=0.002
B=0.75
NO2=0.5
NO3=10
Cl=250
SO4=WS	
As(ac)=340
As(ch)=0.02-10(Trec)
Cd(ac/ch)=TVS
CrIII(ac/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(dis)
Mn(ac/ch)=TVS
Hg(ch)=0.01(Tot)	
Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS
Zn(ac/ch)=TVS	
Temporary Modifications:
Se(ch)=existing ambient quality.
Expiration date of 3/31/2013.	

7.	Mainstem of Surface Creek from the point of diversion of water supply to confluence with Tongue Creek; including mainstem of Ward Creek, from the boundary of national forest lands to the confluence with Tongue Creek; mainstem of Tongue Creek from the source to the confluence with the Gunnison River; mainstem of Youngs Creek from the boundary of national forest lands to the confluence with Kiser Creek; mainstem of Kiser Creek from the boundary of national forest lands to the confluence with Youngs Creek.	

Aq Life Cold 2
Recreation P
Agriculture	
D.O. = 6.0 mg/l
S.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	
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	
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
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	
Fish Ingestion
Temporary modifications:
Se(ch)= 9.3
Fe(ch)(Trec)= 2650
Expiration date of 3/31/2013.

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 lakes (including Trout Lake), reservoirs, and 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, 7a, 7b and 8.	
	
Aq Life Cold 1
Recreation E
Water Supply
Agriculture	
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)
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)	
Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac)=TVS
Ag(ch)=TVS(tr)
Zn(ac)=TVS
Zn(ch)=TVS(sc)	
Temporary Modification:
Cd(ch) = 0.6 Expiration Date 3/31/2013.	

3b.	Mainstem of the San Miguel River from a point immediately above the confluence of Marshall Creek to a point immediately above the confluence of South Fork San Miguel River.	
	
Aq Life Cold 1
Recreation E
Agriculture	
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=100	
As(ac)=340
As(ch)= 7.6(Trec)
Cd(ac)=TVS(tr)
Cd(ch)=TVS
CrIII(ac/ch)=TVS
CrVI(ac/ch)=TVS
Cu(ch)=TVS	
Fe(ch)=1000(Trec)
Pb(ch)=TVS
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(ch)=190	
Temporary Modifications:
Cd(ch) = 0.7
Zn(ch)= 198
Expiration date of 3/31/2013.	

5.	Mainstem of San Miguel River from a point immediately below the confluence of Naturita Creek to its confluence with the Dolores River.	
	
Aq Life Warm 1
Recreation E
Agriculture	
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=100	
As(ac)=340
As(ch)= 7.6(Trec)
Cd(ac/ch)=TVS
CrIII(ac/ch)=TVS
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVS	
Fe(ch)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ac/ch)=TVS
Hg(ch)=0.01(tot)
Ni(ac/ch)=TVS	
Se(ac/ch)=TVS
Ag(ac/ch)=TVS
U(ac/ch)=TVS
Zn(ac/ch)=TVS	

35.33	STATEMENT OF BASIS SPECIFIC STATUTORY AUTHORITY AND PURPOSE JUNE 13, 2011 RULEMAKING REGARDING TEMPORARY MODIFICATIONS; EFFECTIVE DATE JANUARY 1, 2012
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
The Commission’s decision to delay consideration of nutrient criteria until March 2012 resulted in cancelation of the December 2011 review of temporary modifications and a three-month delay of the Regulation #35 basin-wide review.  Accordingly, the Commission considered the expiration dates of temporary modifications expiring on or before December 31, 2012 in a written comment rulemaking.  The Commission extended the expiration dates of the following temporary modifications to March 31, 2013.  They would be reviewed during the September 2012 basin-wide rulemaking hearing.
Upper Gunnison segment 8 (Cd)
Upper Gunnison segment 12 (Cd, Zn)
Upper Gunnison segment 16 (Zn)
North Fork Gunnison segment 3 (Se)
North Fork Gunnison segment 5 (Se)
North Fork Gunnison segment 6b (Fe, Se)
Uncompahgre segment 3a (Cd, Fe)
Uncompahgre segment 4b (Se)
Uncompahgre segment 12 (Se)
Lower Gunnison segment 2 (Se)
Lower Gunnison segment 4a (Se)
Lower Gunnison segment 7 (Fe, Se)
San Miguel segment 2 (Cd)
San Miguel segment 3b (Cd, Zn)
The following temporary modifications were deleted because they will have expired as of the effective date of this revision:
Lower Gunnison segment 4a (NH3)
San Miguel segment 5 (NH3).