COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT
WATER QUALITY CONTROL COMMISSION 
5 CCR 1002-32 
REGULATION NO. 32 
CLASSIFICATIONS AND NUMERIC STANDARDS 
FOR 
ARKANSAS RIVER BASIN
. . . .
32.6 	TABLES

STREAM CLASSIFICATIONS and WATER QUALITY STANDARDS

REGION: 7

BASIN: LOWER ARKANSAS RIVER	
Desig	
Classifications	
NUMERIC STANDARDS	
TEMPORARY
MODIFICATIONS
AND
QUALIFIERS	

	PHYSICAL
and
BIOLOGICAL	INORGANIC
mg/l	METALS
ug/l		

Stream Segment Description							

2a.	All tributaries to the Arkansas River, including wetlands, all lakes and reservoirs, from the Colorado Canal headgate to the Colorado/Kansas border except for specific listings in segments 2b, 2c, 3 through 13, and Middle Arkansas Basin listings.	
UP	
Aq Life Warm 2
Recreation N
Agriculture	
D.O. = 5.0 mg/l
pH = 6.5-9.0
E.Coli=630/100ml
	
CN=0.2
NO2=10
NO3=100
	
B=0.75
	
As(ch)=100(Trec)
Be(ch)=100(Trec)
Cd(ch)=10(Trec)
CrIII(ch)=100(Trec)
	
CrVI(ch)=100(Trec)
Cu(ch)=200(Trec)
Pb(ch)=100(Trec)
	
Ni(ch)=200(Trec)
Se(ch)=20(Trec)
Zn(ch)=2000(Trec)
	.	

2b.	King Arroyo.	
UP	
Aq Life Warm 2
Recreation E
Agriculture	
D.O. = 5.0 mg/l
pH = 6.5-9.0
E.Coli=126/100ml
	
CN=0.2
NO2=10
NO3=100
	
B=5.0
	
As(ch)=200(Trec)
Cd(ch)=50(Trec)
CrIII(ch)=1000(Trec)
	
CrVI(ch)=1000(Trec)
Cu(ch)=500(Trec)
Pb(ch)=100(Trec)
	
Hg(ch)=10.0(tot)
Se(ch)=50(Trec)
Zn(ch)=25000(Trec)
	
Livestock Watering Only.	

2c. 	Mainstem of Wildhorse Creek, including all tributaries, from a point immediately below US Highway 287 in Kit Carson to the confluence with Big Sandy Creek.
	
UP	
Aq Life Warm 2
Recreation N
Agriculture	
D.O. = 5.0 mg/l
pH = 6.5-9.0
E.Coli=630/100ml
	
CN=0.2
NO2=10
NO3=100
	
B=0.75
	
As(ch)=100(Trec)
Be(ch)=100(Trec)
Cd(ch)= 50(Trec)
CrIII(ch)=100(Trec)
	
CrVI(ch)=100(Trec)
Cu(ch)=200(Trec)
Pb(ch)=100(Trec)
	
Ni(ch)=200(Trec)
Se(ch)= 50(Trec)
Zn(ch)=2000(Trec)

3a.	Mainstem of the Apishapa River, including all wetlands, tributaries, lakes and reservoirs, from the source to I-25, except for specific listings in segments 3b and 3c.	
	
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	
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		

. . . .

32.49	STATEMENT OF BASIS SPECIFIC STATUTORY AUTHORITY AND PURPOSE NOVEMBER 14, 2011 RULEMAKING; 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 Town of Kit Carson proposed adoption of standards for selenium and cadmium and resegmentation of Lower Arkansas segment 2a in order to be able to construct and operate new water and wastewater facilities, which are being financed through State Revolving Loan funds.  The purpose of constructing the new facilities is to resolve chronic noncompliance issues. 
Wildhorse Creek is an ephemeral stream with no diversions in the lower portion to which Kit Carson discharges.  No crops, hay meadows, or other forage is irrigated within this portion of lower Wildhorse Creek.  Therefore, the current chronic selenium standard of 20ug/L (based on protecting forage crops) is more protective than necessary to support attainment of the designated uses for this stream reach.  Likewise, no beans, beets, turnips or lettuce (the crops sensitive to cadmium) are irrigated with water from this reach, so the cadmium standard is also more protective than necessary.  Therefore, the Commission has determined that resegmentation and adoption of these selenium and cadmium standards is appropriate under these specific circumstances.
The Commission expects that, consistent with the Division’s practice for reviewing site-specific standards during basinwide reviews, the Division will re-evaluate the conditions of Wildhorse Creek once the Kit Carson wastewater facility is operational.  If the discharge does change the nature of the aquatic habitat and change the expectation for the aquatic life expected to occur in Wildhorse Creek, it may be necessary to revisit the classifications and standards for this segment.