colorado department of public health and environment
WATER QUALITY CONTROL COMMISSION
5 CCR 1002-38
regulation no. 38
classifications and numeric standards
for
south platte river basin, laramie river basin
republican river basin, smoky hill river basin
. . . .
38.6 TABLES 
. . . . 
(4)	Assessment Criteria 
The following criteria shall be used when assessing whether a specified waterbody is in attainment of the specified standard. 
. . . . 
(g)	Upper South Platte Segment 16g (Marcy Gulch): Selenium assessment.
Determination of attainment of the chronic and acute selenium standards will be based on the 85th and 95th percentile, respectively, of paired samples taken the same day from from the two following locations:
∙	L29: Marcy Gulch upstream of Santa Fe Drive, immediately upstream of the Centennial Water & Sanitation District WWTF 
∙	L36: Marcy Gulch upstream of the confluence with the South Platte River.
(h)	Upper South Platte Segment 16j: Selenium assessment. 
Determination of attainment of the chronic and acute selenium standards will be based on the 85th and 95th percentile, respectively. The selenium assessment locations are: 
∙	Lee Gulch: Upstream of the confluence with the South Platte River 
∙	Little’s Creek: Upstream of the confluence with the South Platte River 
∙	Big Dry Creek: Upstream of the confluence with the South Platte River 
∙	Little Dry Creek: Upstream of the confluence with the South Platte River

. . . .

REGION: 3 and 4
               
BASIN: Upper South Platte River	
Desig	
Classifications	
NUMERIC STANDARDS	
TEMPORARY
MODIFICATIONS
AND
QUALIFIERS

	
	
PHYSICAL
and
BIOLOGICAL	
INORGANIC

mg/l	
METALS

g/l

Stream Segment Description							
14.	Mainstem of the South Platte River from the outlet of Chatfield Reservoir to the Burlington Ditch diversion in Denver, Colorado.	
	Aq Life Warm 1
Recreation E
Water Supply
Agriculture	T=TVS(WS-I) oC
summer=14 Feb-Nov
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=0.5
NO3=10
Cl=250
S04=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)
Pb(ac/ch)=TVS
Mn(ch)=190(dis)
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)=TVSx2.7 (Type iii). Applies below the confluence with Marcy Gulch. Expiration date of 12/31/2015.
T=current conditions (Type iii).
Expiration date of 12/31/2015.

Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	
15.	Mainstem of the South Platte River from the Burlington Ditch diversion in Denver, Colorado, to a point immediately below the confluence with Big Dry Creek.	
UP	Aq Life Warm 2 
Recreation E
Water Supply
Agriculture	T=TVS(WS-I) oC
D.O.*
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=1.0
NO3=10
Cl=250
S04=WS	As(ac)=340
As(ch)=0.02-10(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)
Pb(ac/ch)=TVS
Mn(ch)=400(dis)
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	*See attached table for site-specific Dissolved Oxygen and Ammonia standards.
**pH=6.0-9.0 from 64th Ave. downstream 2 miles.  Temporary modifications: NH3(ac)=TVS(old); NH3(ch)=0.10 mg/l
(Type i).  Expiration date of 12/31/2014.
Cu(ac/ch)=TVSx2.3 (Type iii). Expiration date of 12/31/2015.
T=current conditions (Type iii).
Expiration date of 12/31/2015.	
16c.	All tributaries to the South Platte River, including all wetlands, from the outlet of Chatfield Reservoir, to a point immediately below the confluence with Big Dry Creek, except for specific listings in the subbasins of the South Platte River, and in Segments 16a, 16d, 16e, 16f, 16g, 16h, 16i and 16j.	
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=0.5
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)=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		
16g. 	Marcy Gulch, including all wetlands from the source to the confluence with the South Platte.	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=0.5
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)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ac/ch)=TVS
Hg(ch)=0.01(Tot)
Ni(ac/ch)=TVS	Se(ac)= 21
Se(ch)=13
Ag(ac/ch)=TVS
Zn(ac/ch)=TVS	Temporary modifications:
Cu (ac/ch) = TVSx2.4 below the Centennial Wastewater Treatment Facility outfall. 
(Type iii). Expiration date of 12/31/2015.

T=current conditions (Type iii).
Expiration date of 12/31/2015.

Selenium: see assessment locations at 38.6(4)(g)	
16i.  Mainstem of Sand Creek from the confluence with Toll Gate Creek to the confluence with the South Platte River.		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=0.5
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)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ac/ch)=TVS
Hg(ch)=0.01(Tot)
Ni(ac/ch)=TVS	Upper:*  Se(ch)=38.2
Se(ac)=45.1
Lower:*
Se(ch)=9.0
Se(ac)=TVS

Ag(ac/ch)=TVS
Zn(ac/ch)=TVS	* See section 38.6(4)(f) for selenium assessment locations

Temporary Modifications:
Cu (ac/ch) = TVSx2.6 below the Sand Creek Water Reuse Facility outfall. 
(Type iii). Expiration date of 12/31/2015.

Hg(ch)=current condition, Expiration date of 6/30/2017	
16j. 	Lee Gulch, Little’s Creek, Big Dry Creek (Douglas and Arapahoe Counties),and Little Dry Creek, including all wetlands from the source to the confluence with the South Platte.	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=0.5
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)=1000(Trec)
Pb(ac/ch)=TVS
Mn(ac/ch)=TVS
Hg(ch)=0.01(Tot)
Ni(ac/ch)=TVS	Lee Gulch Se(ac/ch)=(TVS/10)
Little’s Creek, Se(ac/ch)= (TVS/6)
 Big Dry Creek Se(ac/ch)=(26/23)
Little Dry Creek Se(ac/ch)=(TVS/11)
Ag(ac/ch)=TVS
Zn(ac/ch)=TVS	Selenium: see assessment locations at 38.6(4)(h)	

BASIN: BEAR CREEK										
1c.	Bear Creek Reservoir.	
	Aq Life Cold 1
Recreation E
Water Supply
Agriculture	T=TVS(CLL) oC
April-Dec
T(WAT)=23.3oC
D.O.=6.0 mg/l
D.O.(sp)=7.0 mg/l
pH=6.5-9.0
E.Coli=126/100ml
Mean chlorophyll = 10 g/l and mean total phosphorus = 32 g/l measured through collection of samples that are representative of the mixed layer during summer months (July, August, September) and with an exceedance frequency of once in five years.	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	Temporary modification:  
Chlorophyll and total phosphorus equal to existing conditions (Type iii).  Expiration date of 12/31/2015.

Temporary modification:
As(ch)=hybrid 
Expiration date of 12/31/21.	
										
BASIN: Clear  CREEK										
2a.	Mainstem of Clear Creek, including all tributaries and wetlands, from the I-70 bridge above Silver Plume to a point just above the confluence with West Fork Clear Creek,except for specific listings in Segments 3a and 3b.	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
SO4=WS
Cl=250	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)
	Temporary modifications:
Zn(ch)=353 g/l (dis), 
Zn(ac)=586 g/l (dis), 
(Type i)
Cd(ch)=1.54(dis)
(type iii)  
Expiration date of 7/01/2015.

Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	
							Zn(ac)= 0.978e(0.8537[In(hardness)]+1.9467)
Zn(ch)= 0.986e(0.8537[In(hardness)]+1.8032)		
2c. 	Mainstem of Clear Creek, including all tributaries and wetlands, from a point just below the confluence with Mill Creek to a point  just above the Argo Tunnel discharge, except for specific listings in Segments 9a, 9b, and 10.	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
SO4=WS
Cl=250	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)

 	Temporary modifications:
Cu(ch)=11.4 g/l (dis),
(Type iii)
Expiration date of 7/01/2015.

Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	
							Zn(ac)= 0.978e(0.8537[ln(hardness)]+1.9467)
Zn(ch)= 0.986e(0.8537[ln(hardness)]+1.8032)		
							Zn(ac)= 0.978e(0.8537[ln(hardness)]+1.9467)
Zn(ch)= 0.986e(0.8537[ln(hardness)]+1.8032)		
9a.	Mainstem of the Fall River, including all tributaries and wetlands, from the source to the confluence with Clear 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)=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(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:
Cu(ch)=9.6 g/l (dis), (type iii)
Expiration date of 7/01/2015.	
11.	Mainstem of Clear Creek from a point just above the Argo Tunnel discharge to the Farmers Highline Canal diversion in Golden, Colorado.	
UP	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)=TVS
CrIII(ac)=50(Trec)
CrVI(ac/ch)=TVS
Cu(ch)=17	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)	Temporary modification:
Cd(ch)=1.42 g/l (dis),
(type iii)  
Expiration date of 7/01/2015.

Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21	
							Zn(ac)= 0.978e(0.8537[ln(hardness)]+1.9467)
Zn(ch)= 0.986e(0.8537[ln(hardness)]+1.8032)		
13b.	Mainstem of North Clear Creek including all tributaries and wetlands from a point just below the confluence with Chase Gulch  to the confluence with Clear Creek, except for the specific listings in Segment 13a.	
UP	Aq Life Cold 2
Recreation E
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	As(ac)=340
As(ch)=100 (Trec)
Cd(ac)=TVS(tr)
Cd(ch)=TVS
CrIII(ac)=50(Trec)
CrVI(ac/ch)=TVS	Cu(ch)=64
Fe(ch)=5400(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(ch)=740 	Temporary modifications: 
Cd(ch)=4.7 g/l (dis),
T=current condition
(type iii ) 
Expiration date of 12/31/2018.	
14a.	Mainstem of Clear Creek from the Farmers Highline Canal diversion in Golden, Colorado to the Denver Water conduit #16 crossing.	
UP	Aq Life Warm 2
Recreation N
Water Supply
Agriculture	T=TVS (WS-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=0.5
NO3=10
Cl=250
SO4=WS	As(ac)=340
As(ch)=0.02-10(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)
Pb(ac/ch)=TVS
Mn(ac)=TVS
Mn(ch)=244
Hg(ch)=0.01(tot)
Ni(ac/ch)=TVS	Se(ac/ch)=TVS
Ag(ac/ch)=TVS
Zn(ac/ch)=TVSx1.57*	Temporary modifications:
Cu(ac/ch)=TVSx3.66*,
T=current condition
(type iii)  
Expiration date of 12/31/2015.	
14b.	Mainstem of Clear Creek from the Denver Water conduit #16 crossing to a point just below Youngfield Street in Wheat Ridge, Colorado.	UP	Aq Life Warm 2
Recreation E
Water Supply
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=0.5
NO3=10
Cl=250
SO4=WS	As(ac)=340
As(ch)=0.02-10(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)
Pb(ac/ch)=TVS
Mn(ac)=TVS
Mn(ch)=244
Hg(ch)=0.01(tot)
Ni(ac/ch)=TVS	Se(ac/ch)=TVS
Ag(ac/ch)=TVS
Zn(ac/ch)=TVSx1.57*	Temporary modifications:
Cu(ac/ch)=TVSx3.66*,
T=current condition
(type iii)  
Expiration date of 12/31/2015.
	
15.	Mainstem of Clear Creek from Youngfield Street in Wheat Ridge, Colorado, to the confluence with the South Platte River.	
	Aq Life Warm 1
Recreation E
Water Supply
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=0.5
NO3=10
Cl=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)
Pb(ac/ch)=TVS
Mn(ac/ch)=TVS
Mn(ch)=WS(dis)
Hg(ch)=0.01(Trec)	Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac/ch)=TVS
Zn(ac/ch)=TVSx1.57*	Aquatic life warm 1 goal qualifier.

Temporary Modifications:
Cu(ac/ch)=TVSx3.66*,
T=current condition 
(Type iii)  Expiration date of 12/31/2015.

Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21.	
* TVS x (times) the FWER (final water effect ratio) = site-specific standard or value of temporary modification.

BASIN: Boulder CREEK										
8.	All tributaries to South Boulder Creek, including all wetlands from South Boulder Road to the confluence with Boulder Creek and all tributaries to Coal Creek, including all wetlands from Highway 93 to the confluence with Boulder Creek.	
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=0.5
NO3=100
Cl=250
SO4=250	As(ac)=340
As(ch)=100(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)
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/ch)=TVS
Zn(ac/ch)=TVS	Temporary modifications:
Se(ch)=12.2 g/l (dis). 
(Type iii).  
Expiration date of 12/31/2015.	
9.	Mainstem of Boulder Creek from a point immediately above the confluence with South Boulder Creek to the confluence with Coal Creek.		Aq Life Warm 1
Recreation E
Water Supply
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=0.5
NO3=10
Cl=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)
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/ch)=TVS
Zn(ac/ch)=TVS	Temporary modifications:
Cu (ac/ch)=Current Condition.  (Type iii).
Expiration date of 12/31/2015.

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

BASIN: ST. VRAIN CREEK										
2b.	Mainstem of St. Vrain Creek, including all tributaries and wetlands, from the eastern boundary of Roosevelt National Forest to Hygiene Road. 	
	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(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:
Cu(ch)=6.0 g/l (dis). 
(Type iii).  
Expiration date of 12/31/2015.	
6.	All tributaries to St. Vrain Creek, including wetlands from Hygiene Road to the confluence with the South Platte River, except for specific listings in the Boulder Creek subbasin and in Segments 4a, 4b, 4c and 5.	
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=0.5
NO3=100	As(ac)=340
As(ch)=100
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
Mn(ch)=WS(dis)
Hg(ch)=0.01(Tot)	Ni(ac/ch)=TVS
Se(ac/ch)=TVS
Ag(ac/ch)=TVS
Zn(ac/ch)=TVS	Temporary modifications:
Se(ch)=6.6g/l (dis). 
(Type iii).  Expiration date of 12/31/2015.  

BASIN: MIDDLE SOUTH PLATTE RIVER										
1a.	Mainstem of the South Platte River from a point immediately below the confluence with Big Dry Creek to the confluence with St. Vrain Creek.	
UP	Aq Life Warm 2
Recreation E
Water Supply
Agriculture	T=TVS(WS-II) oC
D.O.*
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=0.5
NO3=10
Cl=250
SO4=WS	As(ac)=340
As(ch)=0.02-10(Trec)
Cd(ac/ch)=TVS
CrIII(ac)=50(Trec)
CrIII(ch)=TVS
CrVI(ac/ch)=TVS
Cu(ac/ch)=TVSx2.2	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/ch)=TVS
Zn(ac/ch)=TVS	*See attached table for site-specific Dissolved Oxygen and Ammonia standards.
Temporary modifications:
Se(ch)=6.9 g/l (dis). (Type iii).  Expiration date of 12/31/2015.  NH3(ac)=TVS(old)
NH3(ch)=0.10
(Type i).  Expiration date of 12/31/2014.	
4.	Barr Lake and Milton Reservoir.	
UP	Aq Life Warm 2
Recreation E
Water Supply
Agriculture	T=TVS(WL) 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=0.5
NO3=10
Cl=250
SO4=WS	As(ac)=340
As(ch)=0.02(Trec)
Cd(ac/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(ac/ch)=TVS
Mn(ch)=WS(dis)
Hg(ch)=0.01(Tot)
Ni(ac/ch)=TVS	Se(ac/ch)=TVS
Ag(ac/ch)=TVS
Zn(ac/ch)=TVS	Fish Ingestion Standards
Temporary modification:  
pH= existing quality (Type iii). 
Expiration date of 12/31/2015.	

BASIN: BIG THOMPSON RIVER										
2.	Mainstem of the Big Thompson River, including all tributaries and wetlands from the boundary of Rocky Mountain National Park to the Home Supply Canal diversion, except for the specific listing in Segment 7; mainstem of Black Canyon Creek and Glacier Creek below Estes Park water treatment plant.
	
	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(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: 
D.O., E. coli, NH3, NO3, B, Cd, Cu, Pb, Hg, Ni, Se, Ag, Zn = current condition.  Wapiti Meadow wetlands at the toe of Lake Estes Dam (Type iii).
Expiration date of 12/31/2015.
Cu(ch)=2.5 g/l (dis). (Type iii). Mainstem. Expiration date of 12/31/2015.

Temporary modification:
As(ch)=hybrid
Expiration date of 12/31/21
.	
4b.	Mainstem of the Big Thompson from the Greeley-Loveland Canal diversion to County Road 11H.	
	Aq Life Warm 2
Agriculture

5/1 – 10/15
Recreation E

10/16 – 4/30
Recreation N	T=TVS(WS-I) oC
D.O. = 5.0 mg/l
pH = 6.5-9.0

5/1 – 10/15
E.Coli=126/100ml

10/16 – 4/30
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=0.5
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
Zn(ac/ch)=TVS	Fish Ingestion Standards
Temporary modification:
Se(ch)=5.5g/l (dis).
(type iii)
Expiration date of 12/31/2015.	
5.	Mainstem of The Big Thompson River from I-25 to the confluence with the South Platte River.	
	Aq Life Warm 2
Agriculture

5/1 – 10/15
Recreation P

10/16 – 4/30
Recreation N	T=TVS(WS-I) oC
D.O. = 5.0 mg/l
pH = 6.5-9.0

5/1 – 10/15
E.Coli=205/100ml

10/16 – 4/30
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=0.5
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)=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:
Se(ch)=5.7 g/l (dis). 
(Type iii).  
Expiration date of 12/31/2015.
	
9.	Mainstem of the Little Thompson River from the Culver Ditch diversion to the confluence with the Big Thompson River.	
	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=0.5
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)=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:
Se(ch)=13.1 g/l (dis). (Type iii).  Expiration date of 12/31/2015.

BASIN: CACHE LA POUDRE RIVER										
11.	Mainstem of the Cache La Poudre River from Shields Street in Ft. Collins to a point immediately above the confluence with Boxelder Creek.	
	Aq Life Warm 2
Recreation E
Agriculture	T=TVS(WS-I) 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=2.7
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
Zn(ac/ch)=TVS	Nitrite as a 30 day average. 
Fish Ingestion Standards

Temporary Modifications:
Se(ch)=5.4 g/l (dis). (Type iii).  Expiration date of 12/31/2015.	
13b.	Mainstem of Boxelder Creek from its source to the confluence with the Cache La Poudre River.	
	Aq Life Warm 2

5/15-9/15
Recreation P

9/16-5/14
Recreation N

Agriculture	T=TVS(WS-II) oC
D.O.=5.0 mg/l
pH=6.5-9.0

5/15-9/15
E.Coli=205/100ml 

9/16-5/14
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=0.5
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)=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:
Se(ch)=13.0 g/l (dis). (Type iii).  Expiration date of 12/31/2015.

BASIN: LOWER SOUTH PLATTE RIVER										
1.	Mainstem of the South Platte River from the Weld/Morgan County line to the Colorado/Nebraska border.	
	Aq Life Warm 2
Recreation E
Water Supply
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=0.5
NO3=10
Cl=250
SO4=WS	As(ac)=340
As(ch)=0.02-10(Trec)
Cd(ac/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(ac/ch)=TVS
Mn(ch)=WS(dis)
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)=12.3 g/l (dis). (Type iii).  Expiration date of 12/31/2015.

38.88	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 standards on twenty-six segments were reviewed.  
Allow to expire, delete: The Commission took no action on the Temporary Modification of the selenium standard on Upper South Platte segment 14. This Temporary Modification was deleted from the table because it expires 12/31/2013.
No action, will be reviewed again :  The Commission took no action on the temporary modifications on the following segments.  These temporary modifications will be reviewed again at the annual temporary modification hearing in December 2014.
∙	Site-specific compliance with ammonia criteria: Temporary Modifications of the ammonia standards for Upper South Platte segment 15 and Middle South Platte segment 1a were granted to allow time for compliance with revised ammonia standards.  Metro Wastewater Reclamation District presented evidence that they are on schedule to make water quality improvements and that the Temporary Modification will no longer be needed after December 2014.
∙	Biotic ligand model-based copper Temporary Modifications:  Individual SP CURE members and other interested regulated entities presented evidence that progress is being made to develop a biotic ligand model-based site specific standards.  They are on schedule to make water quality standards proposals for consideration by the Commission in the basin-wide hearing in June 2015.  
Upper South Platte segments 14, 15, 16g and 16i
Clear Creek segments 14a, 14b and 15
Boulder Creek segment 9 
∙	Other Temporary Modifications:  The following Temporary Modifications were reviewed and the Commission took no action.  They will be reviewed again at the annual temporary modification hearing in December 2014, and again at the the basin-wide hearing in June 2015. . 
Upper South Platte segment 14 temperature
Upper South Platte segment 15 temperature
Upper South Platte segment 16g temperature
Bear Creek segment 1c chlorophyll a and phosphorus
Clear Creek segment 2a cadmium and zinc
Clear Creek segment 2c copper
Clear Creek segment 9a copper
Clear Creek segment 11 cadmium
Clear Creek segment 13b cadmium and temperature
Clear Creek segment 14a temperature
Clear Creek segment 14b temperature
Clear Creek segment 15 temperature
Boulder Creek segment 8 selenium
St Vrain Creek segment 2b copper
St Vrain Creek segment 6 selenium
Middle South Platte segment 1a selenium
Middle South Platte segment 4 pH
Big Thompson River segment 2 (Wapiti Meadows) DO, E coli, ammonia, nitrate boron, cadmium, copper, lead, mercury, nickel, selenium, silver and zinc
Big Thompson River segment 4b selenium
Big Thompson River segment 5 selenium
Big Thompson River segment 9 selenium
Cache La Poudre River segment 11 selenium
Cache La Poudre River segment 13b selenium
Lower South Platte segment 1 selenium

Site Specific Selenium Standards: The Commission considered site-specific ambient-based selenium standards for Upper South Platte Segment 16g (Marcy Gulch) and similar nearby tributaries to South Platte River Segment 14.  Evidence submitted by Centennial Water & Sanitation District showed that selenium loading to Segment 16g results from natural sources and is not exacerbated by point source discharges or reversible anthropogenic factors.  Marcy Gulch and nearby tributaries cross areas of selenium-bearing shale and groundwater that comes into contact with the shale increases in selenium concentration, which in turn contributes selenium when the groundwater enters the streams. 
∙	Marcy Gulch (segment 16g): Although the Centennial sewer system does not have a large amount of inflow and infiltration, some groundwater with high selenium concentrations enters the system from residential areas within the Marcy Gulch drainage. This inflow increases the Centennial WWTP effluent selenium concentration at times to concentrations that exceed the table value standards. Centennial was not able to identify any industrial sources of selenium. Treatment at the Centennial WWTP results in incidental removal of selenium, and therefore further reductions in inflow and infiltration to control effluent selenium concentration would result in a loss of incidental treatment and a net increase in selenium loading to Marcy Gulch and the South Platte River.  The Commission concluded that the contribution of selenium from groundwater to Marcy Gulch and to the Centennial WWTP is a natural or irreversible human-induced condition. Therefore, for Segment 16g, the Commission adopted site-specific ambient-based chronic and acute dissolved selenium standards. The chronic (13 μg/L) and acute (21 μg/L) standards are based on the 85th and 95th percentiles, respectively,  of samples taken the same day from sites located upstream and downstream of the Centennial WWTP.  In order to preserve the wide spatial and temporal variability of selenium concentrations in the segment and to protect against deterioration, the Commission defined assessment methods at Reg. 38.6(4)(g) in order to ensure that future assessment is consistent with the methods used to derive the standards. The Commission removed the temporary modification for selenium of “current conditions” that had previously been in place for Segment 16g. 
∙	Nearby tributaries Lee Gulch, Little’s Creek Big Dry Creek and Little Dry Creek, (segment 16j): The Commission also re-segmented Upper South Platte Segment 16c (All tributaries to the South Platte River from Chatfield Reservoir to Big Dry Creek), to facilitate the adoption of site-specific ambient-based selenium standards for several tributaries to the South Platte River near Marcy Gulch.  The evidence submitted by Centennial, the City of Littleton and the City of Englewood demonstrated that each of the tributaries have natural or irreversible human-induced elevated selenium concentrations, that result from regional geology similar to that found in Marcy Gulch and in the Toll Gate Creek drainages. None of the tributaries have point source discharges contributing to selenium concentrations. Urbanization of the area is an irreversible condition that could contribute to an increase in groundwater coming into contact with selenium-bearing shale. The Commission created new Upper South Platte Segment 16j with site-specific ambient-based selenium standards as follows: Lee Gulch Se(ac/ch)=(TVS/10), Little’s Creek, Se(ac/ch)= (TVS/6),  Big Dry Creek Se(ac/ch)=(26/23), and Little Dry Creek Se(ac/ch)=(TVS/11). The selenium standards for Segment 16j were calculated using data from locations near the confluence of each tributary with the South Platte River. The Commission specified assessment locations at Reg. 38.6(4)(h) in order to ensure that future assessment is consistent with the methods used to derive the standards. Other than the selenium standards, Segment 16j inherits the use classifications, antidegradation designation, and water quality standards from Segment 16c because the evidence was limited to selenium standards.
Clear Creek segment 13b (North Fork of Clear Creek):  The Commission considered the temporary modification for Clear Creek segment 13b.  Black Hawk/Central City Sanitation District and the City of Black Hawk (“BH/CCSD”) proposed extending the temporary modification for cadmium in Clear Creek Segment 13b.  Evidence submitted by BH/CC shows that the metals concentrations in Clear Creek are the result of a combination of natural and human-induced conditions which are currently the focus of Superfund cleanup work.  Additional cleanup is planned as part of OU4, including the construction of a new mine wastewater treatment plant to treat discharges from the National Tunnel, Gregory Gulch and Gregory Incline.  Additional cleanup is also planned for the Quartz Hill mine tailings pile, including re-grading and capping.  These efforts are not expected to be completed until 2015 at the earliest, and are expected to result in significant water quality improvements within Clear Creek, segment 13b.  The degree of improvement is still uncertain and will not be known until after the treatment measures are implemented and the improvements are quantified.  
The BH/CCSD has a predicted water quality-based effluent limit compliance problem for cadmium, however they do not have a predicted compliance problem for the other metals.  Therefore, the Commission deleted the temporary modifications for manganese, zinc and iron.  In addition, the Commission extended the expiration date of the temporary modification for dissolved cadmium on Clear Creek Segment 13b to December 31, 2018, to allow time for the treatment measures to be implemented and the improvements to be quantified.  The temporary modifications will be reviewed in the 2016 and 2017 annual temporary modification review hearing.  A 2018 expiration date will allow for a 2016 review of the status of the temporary modification prior to the BH/CCSD permit renewal in 2017, and may lead to an extension of the temporary modification if that is determined appropriate based on information available at the 2016 review.
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