COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT 
WATER QUALITY CONTROL COMMISSION 
5 CCR 1002-34
REGULATION NO. 34
CLASSIFICATIONS AND NUMERIC STANDARDS
FOR
SAN JUAN AND DOLORES RIVER BASINS

. . . .

REGION: 9

BASIN:  SAN JUAN RIVER	
Desig	
Classifications	
NUMERIC STANDARDS	
TEMPORARY
MODIFICATIONS
AND
QUALIFIERS	

	
PHYSICAL
and
BIOLOGICAL	
INORGANIC

mg/l	
METALS

ug/l		

Stream Segment Description							

11a.	All tributaries to the San Juan River, including wetlands, lakes, and reservoirs, from Fourmile Creek to the Southern Ute Indian Reservation boundary except for the specific listings in Segments 1, 4, 5, 6a, 6b, 9a and 9b.	
	
Aq Life Warm 1
Agriculture 
Nov. 1 to April 30
Recreation N

May 1 to Oct. 31
Recreation E	
D.O. = 5.0 mg/l
pH = 6.5-9.0
Nov. 1 to April 30
E.Coli=630/100ml

May 1 to Oct. 31
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
	
As(ac)=340
As(ch)=7.6(Trec)
Cd(ac)=TVS(tr)
Cd(ch)=TVS
CrIII(ac)=50(Trec)
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:
Fe(ch)=1100.
Expiration date of 3/31/2013.	

REGION: 9

BASIN:  ANIMAS AND FLORIDA 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 Animas River, including all tributaries and wetlands, from the outlet of Denver Lake to a point immediately above the confluence with Maggie Gulch, except for specific listings in Segment 6.	

UP	
Recreation E
Agriculture
	
D.O. = 3.0 mg/l
pH = 5.8-9.0
E.Coli=126/100ml	
CN(ac)=0.2
NO2(ac)=10
NO3(ch)=100	
B(ch)=0.75	
As(ch)=100(Trec)	CrVI(ch)=100(Trec)	Ni(ch)=200(Trec)
Be(ch)=100(Trec)	Cu(ch)=200(Trec)	Se(ch)=20(Trec)
Cd(ch)=10(Trec)	Pb(ch)=100(Trec)	Zn(ch)=2000(Trec)
CrIII(ch)=100(Trec)
The concentration of dissolved aluminum, cadmium, copper, iron, lead,manganese, and zinc that is directed toward maintaining and achieving water quality standards established for segments 3a, 4a and 4b.	
Temporary modification:  existing ambient quality for all metals.  Expiration date of 3/31/2013.	

3a.	Mainstem of the Animas River, including wetlands, from a point immediately below the confluence with Maggie Gulch to immediately above the confluence with Cement 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=0.005	
S=0.002
B=0.75	
Al(ac/ch)=750(Trec)	CrVI(ac/ch)=TVS	Se(ac/ch)=TVS
As(ac)=340 
As(ch)=100(Trec)	Fe(ch)=1000(Trec)	Ni(ac/ch)=TVS	
Cd(ac)=TVS(tr)	Pb(ac/ch)=TVS	Ag(ac)=TVS
CrIII(ac/ch)=TVS	Hg(ch)=0.01(tot)	Ag(ch)=TVS(tr)	
Cu(ac/ch)=TVS
Standards for Cd, Mn and Zn are listed on Table 1.	
Aquatic life indicator
goal: Brook Trout.  Temporary  modifications for:
Cd(ch)=3.0 Mn(ch)=3203 Zn(ch)=862
Expiration date of 3/31/2013.	

3b.	Mainstem of the Animas River, including wetlands, from a point immediately above the confluence with Cement Creek to a point immediately above the confluence with Mineral Creek. 	

UP	
Sept. 11 to May 14
Recreation N 

May 15 to Sept. 10
Recreation E	
D.O. = 3.0 mg/l 
pH = 6.0-9.0
Sept. 11 to May 14
E.Coli=630/100ml

May 15 to Sept. 10
E.Coli=126/100ml 	

The concentration of dissolved aluminum, cadmium, copper, iron, lead, manganese, and zinc that is directed toward maintaining and achieving water quality standards established for segments 4a and 4b.	
Temporary modification:  Existing ambient quality for all metals.  Expiration date of 3/31/2013.	

3c.	Arrastra Gulch including all lakes, tributaries, and wetlands from the source to the confluence with the Animas River.	
UP
	
Aq Life Cold 2
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=0.005	
S=0.002
B=0.75
NO2=0.05	
As(ac)=340
As(ch)=100(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:
Cu(ch)=6.6 
Zn(ch)=184
no Cu, Zn acute.
Expiration date of 3/31/2013.	

4a.	Mainstem of the Animas River, including wetlands, from a point immediately above the confluence with Mineral Creek to a point immediately above the confluence with Deer Park Creek.	

UP	
Aq Life Cold 2
Recreation E
Agriculture	
D.O. = 6.0 mg/l
D.O.(sp)=7.0 mg/l
E.Coli=126/100ml
Standards for pH are listed on Table 1.	
NH3(ac/ch)=TVS
Cl2(ac)=0.019
Cl2(ch)=0.011
CN=0.005	
S=0.002
B=0.75
	
As(ch)=100(Trec)
As(ac)=340
Cu(ac/ch)=TVS	Se(ac/ch)=TVS
Cd(ac)=TVS(tr)	Pb(ac/ch)=TVS	Ag(ac)=TVS
Cd(ch)=TVS		Mn(ac/ch)=TVS	Ag(ch)=TVS(tr)
CrIII(ac/ch)=TVS	Hg(ch)=0.01(tot)
CrVI(ac/ch)=TVS	Ni(ac/ch)=TVS
Standards for Al, Fe and Zn are listed on Table 1.	
Aquatic life indicator
goal: Brook Trout
Temporary modifications:
Al(ch)=2523(Trec)
Fe(ch)=4204(Trec)
Zn(ch)=730
Cu(ch)=20
Cd(ch)=2.5
pH=5.3
Expiration date of 3/31/2013.	

4b.	Mainstem of the Animas River, including wetlands, from a point immediately above  the confluence with Deer Park Creek to Bakers Bridge.	
	
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=0.005	
S=0.002
B=0.75
NO2=0.05
NO3=10
Cl=250
SO4=WS	
Al(ac/ch)=TVS
As(ch)=0.02(Trec)
As(ac)=340
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)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ch)=WS(dis)
Mn(ac/ch)=TVS
Ni(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:
Zn(ch)=184
Expiration date of 3/31/2013.	

7.	Mainstem of Cement Creek, including all tributaries, wetlands, lakes, and reservoirs, from the source to the confluence with the Animas River.	

UP	
Recreation E
Agriculture	
D.O. = 3.0 mg/l
pH = 3.7-9.0
E.Coli=126/100ml	
CN(ac)=0.2
NO2(ac)=10
N03(ac)=100	
B(ch)=0.75	
As(ch)=100(Trec)	CrVI(ch)=100(Trec)	Ni(ch)=200(Trec)
Be(ch)=100(Trec)	Cu(ch)=200(Trec)	Se(ch)=20(Trec)
Cd(ch)=10(Trec)	Pb(ch)=100(Trec)	Zn(ch)=2000(Trec)
CrIII(ch)=100(Trec)		
The concentration of dissolved aluminum, cadmium, copper, iron, lead, manganese, and zinc that is directed toward maintaining and achieving water quality standards established for segments 4a and 4b.	
Temporary modification:  existing ambient quality for all metals.  Expiration date of 3/31/2013.	

8.	Mainstem of Mineral Creek, including wetlands, from the source to a point immediately above the confluence with South Mineral Creek.  All tributaries on the east side of this segment of Mineral Creek including wetlands, lakes and reservoirs except for Big Horn Creek.  Mainstem of the Middle Fork of Mineral Creek including all tributaries, wetlands, lakes and reservoirs from the source to the confluence with Mineral Creek except for Crystal Lake and its exiting tributary to confluence with Middle Fork of Mineral Creek.	

UP	
Recreation E
Agriculture	
D.O. = 3.0 mg/l
pH = 4.5 - 9.0
E.Coli=126/100ml	
CN(ac)=0.2
NO2(ac)=10
N03(ac)=100	
B(ch)=0.75	
As(ch)=100(Trec)	CrVI(ch)=100(Trec)	Ni(ch)=200(Trec)
Be(ch)=100(Trec)	Cu(ch)=200(Trec)	Se(ch)=20(Trec)
Cd(ch)=10(Trec)	Pb(ch)=100(Trec)	Zn(ch)=2000(Trec)
CrIII(ch)=100(Trec)		
The concentration of dissolved aluminum, cadmium, copper, iron, lead, manganese, and zinc that is directed toward maintaining and achieving water quality standards established for segments 4a and 4b.	
Temporary modification: existing ambient quality for all metals.  Expiration date of 3/31/2013.	

9.	Mainstem of Mineral Creek, including wetlands, from immediately above the confluence with South Mineral Creek to the confluence with the Animas River.	

UP	
Aq Life Cold 2
Recreation E
Agriculture	
D.O. = 6.0 mg/l
D.O. (sp)=7.0 mg/l
E.Coli=126/100ml
Standards for pH are listed on Table 1.	
NH3(ac/ch)=TVS
Cl2(ac)=0.019
Cl2(ch)=0.011
CN=0.005	
S=0.002
B=0.75
NO2=0.05	
As(ch)=100(Trec)
As(ac)=340	Cu(ac)=TVS	Ni(ac/ch)=TVS
Cd(ac/ch)=TVS(tr)	Pb(ac/ch)=TVS	Se(ac/ch)=TVS
CrIII(ac/ch)=TVS	Mn(ac/ch)=TVS	Ag(ac)=TVS
CrVI(ac/ch)=TVS	Hg(ch)=0.01(tot)	Ag(ch)=TVS(tr)
Zn(ac)=TVS
Standards for Al, Cu, Fe and Zn are listed on Table 1.	
Temporary modifications:
Al(ch)=3544(Trec)
Cu(ch)=22
Fe(ch)=5023(Trec)
Zn(ac/ch)=340
Expiration date of 3/31/2013.
Aquatic Life indicator goal:  Macroinvertebrates; Brook Trout corridor 	

REGION: 9

BASIN:  LA PLATA RIVER, MANCOS RIVER, McELMO CREEK, AND SAN JUAN RIVER IN MONTEZUMA COUNTY AND DOLORES COUNTY	
Desig	
Classifications	
NUMERIC STANDARDS	
TEMPORARY
MODIFICATIONS
AND
QUALIFIERS	

	
PHYSICAL
and
BIOLOGICAL	
INORGANIC
mg/l	
METALS
ug/l		

Stream Segment Description							

7a.	Mainstem of McElmo Creek from the source to the Colorado/Utah border, except for the specific listings in Segment 7b. Mainstem of Yellow Jacket Creek, including all tributaries, wetlands, lakes and reservoirs, from the source to the confluence with McElmo Creek. 	
	
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=0.005	
S=0.002
B=0.75
NO2=0.05	
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)=2200(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 Modifications:
NH3(ac)=old TVS, NH3(ch)=0.06(type iii)
Expiration date of 3/31/2013.	

8a.	All tributaries to McElmo Creek, including all wetlands, lakes and reservoirs, from the source to the Colorado/Utah border, except for specific listings in Segments 7a, 8b, 8c and 11.	
UP	
Aq Life Warm 2
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=0.005	
S=0.002
B=0.75
NO2=0.05	
As(ac)=340
As(ch)=100(Trec)
Cd(ac/ch)=TVS
CrIII(ac/ch)=TVS
CrVI(c/ch)=TVS	
Cu(ac/ch)=TVS
Fe(ch)=1000(Trec)
Mn(ac/ch)=TVS
Pb(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:
Fe(ch)=1500(trec)
expiration date 3/31/2013.

34.36	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 #34 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.
San Juan segment 11a (Fe)
Animas segment 2 (all metals)
Animas segment 3a (Cd, Mn, Zn)
Animas segment 3b (all metals)
Animas segment 3c (Cu, Zn)
Animas segment 4a (Al, Fe, Zn, Cu, Cd, pH)
Animas segment 4b (Zn)
Animas segment 7 (all metals)
Animas segment 8 (all metals)
Animas segment 9 (Al Cu, Fe, Zn)
La Plata etc, segment 7a (NH3)
La Plata etc, segment 8a (Fe).