REGULATION #38 STREAM CLASSIFICATIONS and WATER QUALITY STANDARDS

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							
22a.	Lakes and reservoirs in watersheds tributary to the South Platte River 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 16b, 17a, 17b, 17c, 22b, and 23.	
	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
S04=WS 	As(ac)=340
As(ch)=0.02(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(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
	
22b.  Lakes and reservoirs located in the Rocky Mountain Arsenal National Wildlife Refuge		Aq Life Warm 2
Recreation E
Agriculture	T=TVS(WL) oC
D.O.=5.0 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=0.5
NO3=100	Al(ac/ch)=TVS
As(ac)=340
As(ch)=150
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		

38.84	FINDINGS IN SUPPORT OF ADOPTION OF EMERGENCY REVISIONS TO REGULATION #38, CLASSIFICATIONS AND NUMERIC STANDARDS FOR SOUTH PLATTE RIVER BASIN, LARAMIE RIVER BASIN REPUBLICAN RIVER BASIN, SMOKY HILL RIVER BASIN (5 CCR 1002-38) 
Pursuant to sections 25-8-208, 25-8-402(5), and 24-4-103(6), C.R.S., the Commission adopted a revision to Regulation #38, Classifications and Numeric Standards for South Platte River Basin, Laramie River Basin Republican River Basin, Smoky Hill River Basin on May 13, 2013. 
The United States Fish and Wildlife Service, Rocky Mountain Arsenal National Wildlife Refuge (“Refuge”) proposed to split Upper South Plate segment 22, and create a new segment, Upper South Platte River segment 22b, that encompasses the lakes and reservoirs on the Refuge property. These lakes are known as Lake Mary, Lake Ladora, Upper Derby Lake, and Lower Derby Lake. The new segment will retain the Aquatic Life Warm 2, Recreation E, and Agriculture uses and standards, but the Water Supply use classification will be removed. The Refuge provided evidence to the Commission that there is no water supply use from the lakes and that a water supply use is precluded by the 1989 Federal Facilities Agreement for the Arsenal.  In addition, consumption of fish from these leakes is precluded by this same Agreement and by 50 C.F.R. § 32.25. 
In 1998, as a matter of public interest, the United States entered into an agreement to trade its water rights delivered by the Highline Canal in exchange for Denver Water reclaimed water to be delivered by September 2011. This line would deliver much of the water needed by the Refuge. In the interim, Highline water was supposed to continue. This agreement was amended to substitute potable water for Highline water, which allowed for the Highline Canal to be abandoned within the Refuge. This temporary agreement expires on September 30, 2013. Due to drought conditions, it is in the public interest to maximize the conservation of potable water supplies in the Denver Metropolitan area. The preferred alternate for the Refuge is reclaimed water delivered by Denver Water. For all intents and purposes, the reclaimed water is available for delivery right now via a pipeline that was completed in 2012. This emergency rulemaking will expedite the process for the U.S. EPA to issue an NPDES permit for the discharge of the reclaimed water to the lakes within the Refuge where it can be used for irrigation. In addition, the inability of the Refuge to utilize the reclaimed water line is negatively impacting Denver Water’s ability to implement its reclaimed water system in northeast Denver.
The factors that necessitated an emergency rulemaking are: 1) due to drought conditions, it is in the public interest to maximize conservation of potable water supplies in the Denver Metropolitan area; 2) a substantial economic investment of public funds has been made in the construction of a reclaimed water pipeline to the Refuge; 3) the current contract between Denver Water and the Refuge to provide potable water to maintain the lake levels and support the prairie restoration efforts expires in September 2013 and groundwater pumping will not be sufficient for this purpose; and 4) failure to utilize the reclaimed pipeline to deliver water to the Refuge adversely affects other users of that pipeline.  The Commission therefore finds that these circumstances warrant an emergency rule as necessary for the preservation of the public welfare and that compliance with notice requirements would be contrary to the public interest.
These revisions shall be effective May 13, 2013 and shall remain in effect until the effective date of permanent regulations, or one year, whichever comes first.