COLORADO DEPARTMENT OF HEALTH
WATER QUALITY CONTROL COMMISSION
5 CCR 1002-33
CLASSIFICATIONS AND NUMERIC STANDARDS
FOR
UPPER COLORADO RIVER BASIN AND
NORTH PLATTE RIVER (PLANNING REGION 12)
REGULATION NO. 33
. . . 
33.6	TABLES
(1)	Introduction
The numeric standards for various parameters in the attached tables were assigned by the Commission after a careful analysis of the data presented on actual stream conditions and on actual and potential water uses.
Numeric standards are not assigned for all parameters listed in the tables attached to 31.0.  If additional numeric standards are found to be needed during future periodic reviews, they can be assigned by following the proper hearing procedures.
(2)	Abbreviations:
(a)	The following abbreviations are used in the attached tables:
ac	=	acute (1-day)
Ag	=	silver
Al	=	aluminum
. . . 
Zn	=	zinc
(b)	In addition, the following abbreviations were used:
Fe(ch)		=	WS(dis)
Mn(ch)		=	WS(dis)
SO4		=	WS
These abbreviations mean:  For all surface waters with an actual water supply use, the less restrictive of the following two options shall apply as numerical standards, as specified in the Basic Standards and Methodologies at 31.11(6):
(I)	existing quality as of January 1, 2000; or
(ii)	Iron		=	300 µg/l (dissolved)
Manganese	=	50 µg/l (dissolved)
SO4		=	250 mg/l
For all surface waters with a “water supply” classification that are not in actual use as a water supply, no water supply standards are applied for iron, manganese or sulfate, unless the Commission determines as the result of a site-specific rulemaking hearing that such standards are appropriate.
(c)	As used in the “Temporary Modifications and Qualifiers” column of the tables, the term “type i” refers to a temporary modification adopted pursuant to subsection 31.7(3)(a)(i) of the Basic Standards and Methodologies for Surface Water(i.e., “where the standard is not being met because of human-induced conditions deemed correctable within a twenty (20) year period).  The term “type iii” refers to a temporary modification adopted pursuant to subsection 31.7(3)(a)(iii) of the Basic Standards and Methodologies for Surface Water (i.e., “where there is significant uncertainty regarding the appropriate long-term underlying standard”).
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[INSERT TABLES HERE] 
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33.43	STATEMENT OF BASIS, SPECIFIC STATUTORY AUTHORITY AND PURPOSE:  DECEMBER 10, 2007 RULEMAKING REGARDING TEMPORARY MODIFICATIONS; EFFECTIVE MARCH 1, 2008 
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 to determine whether the temporary modification should be modified, eliminated or extended.
Language was added to subsection 33.6(2) to explain the terms “type i” and “type iii” temporary modifications. 
The following segment’s temporary modification was inadvertently left in the table after last year’s hearing.  It was deleted in this hearing.
Yampa River segment 13d, temporary modification for selenium.
Parties are working to resolve uncertainty and are on schedule to address these segments at the regularly scheduled basin-wide rulemaking (June 2008), The Commission added "type iii", but took no action on the expiration date for the following segments. 
Blue River segment 6:  temporary modification for cadmium, copper and zinc
Eagle River segment 5a:  seasonal temporary modification for zinc
Eagle River segment 5b:  seasonal temporary modification for zinc
Eagle River segment 5c:  seasonal temporary modification for zinc
Eagle River segment 7b:  seasonal temporary modification for zinc.
PARTIES TO THE RULEMAKING
1.	Big Dry Creek Cities  (City of Westminster, City of Northglenn, and City and County of Broomfield)
2.	Colorado Rock Products Association
3.	City of Grand Junction
4.	City of Colorado Springs and Colorado Springs Utilities
5.	Upper Clear Creek Watershed Association
6.	City of Black Hawk and Black Hawk / Central City Sanitation District
7.	Department of Energy Office of Legacy Management
8.	City of Aurora
9.	Shell Frontier Oil & Gas, Inc.
10.	City of Boulder
11.	Tri-Lakes Wastewater Treatment Facility
12.	Security Sanitation District
13.	City of Fort Collins
14.	Metro Wastewater Reclamation District
15.	U.S. EPA