COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT
WATER QUALITY CONTROL COMMISSION
5 ccr 1002-37
REGULATION NO.  37
CLASSIFICATIONS AND NUMERIC STANDARDS
FOR
LOWER COLORADO RIVER BASIN
. . . .
37.6	TABLES
. . . .
STREAM CLASSIFICATIONS and WATER QUALITY STANDARDS
REGION:11

BASIN:  Lower Colorado River	

Desig	

Classifications	
NUMERIC STANDARDS	
TEMPORARY
MODIFICATIONS
AND
QUALIFIERS	

Stream Segment Description			PHYSICAL
and
BIOLOGICAL
	
INORGANIC
mg/l	
METALS
ug/l		
4e.  Mainstem of Dry Creek including all tributaries and wetlands from the source to immediately above the Last Chance Ditch.	UP	Aq Life Cold 2
Recreation N
Agriculture	T=TVS(CS-II) oC
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=0.005	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)=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
Zn(ac/ch)=TVS	Temporary Modifications:
Cu(ac/ch)=existing quality
Fe(ch)=existing quality(Trec)
(Type iii)
Expiration 12/31/2015	
13b. All tributaries to the Colorado River, including wetlands, from the Government Highline Canal Diversion to a point immediately below Salt Creek, and downgradient from the Government Highline Canal, the Orchard Mesa Canal No. 2, Orchard Mesa Drain, Stub Ditch and the northeast Colorado National Monument boundary.	
UP	Aq Life Warm 2
Recreation E
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=0.005	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)=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
Zn(ac/ch)=TVS		

37.32	STATEMENT OF BASIS SPECIFIC STATUTORY AUTHORITY AND PURPOSE DECEMBER 9, 2013 RULEMAKING; FINAL ACTION MARCH 11, 2014, EFFECTIVE DATE JUNE 30, 2014
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
Pursuant to the requirements in the Basic Standards (at 31.7(3)), the Commission reviewed the status of temporary modifications scheduled to expire before December 31, 2015, to determine whether the temporary modification should be modified, eliminated or extended.  Temporary modifications of 2 segments were reviewed.  
Deleted:  The temperature Temporary Modifications on Lower Colorado segment 13 b (Persigo Wash) were deleted since they expired on 6/30/2013.
No Action:  Temporary modifications of the copper and iron standards on Lower Colorado segment 4e.  Tri-state Generation and Transmission Association, Inc., presented evidence that progress is being made on the plan to resolve uncertainty.  Tri-State is on schedule to make a water quality standards proposal for consideration by the Commission in the basin-wide hearing in June 2014.
PARTIES TO THE RULEMAKING HEARING
1.	Rio Grande Silver, Inc.
2.	Black Hawk/Central City Sanitation District and City of Black Hawk
3.	Centennial Water & Sanitation District, City of Littleton, City of Englewood
4.	Colorado Parks and Wildlife
5.	Homestake Mining Company of California
6.	Metro Wastewater Reclamation District
7.	South Platte Coalition for Urban River Evaluation (SP CURE)
8.	City of Boulder
9.	Seneca Coal
10.	Tri-State Generation and Transmission Association
11.	City of Fort Collins
12.	MillerCoors, LLC
13.	Environmental Protection Agency
14.	Barr Lake and Milton Reservoir Watershed Association
15.	Plum Creek Water Reclamation Authority