COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT 
WATER QUALITY CONTROL COMMISSION 
5 CCR 1002-34
REGULATION NO. 34
CLASSIFICATIONS AND NUMERIC STANDARDS
FOR
SAN JUAN AND DOLORES RIVER BASINS
. . . .
34.6 	TABLES
. . . .
(3) 	Table Value Standards
. . . .
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Temperature	TEMPERATURE TIER	TIER CODE	SPECIES EXPECTED TO BE PRESENT	APPLICABLE MONTHS	TEMPERATURE STANDARD (OC)	
					MWAT	DM	
	. . . .						
	Warm Stream Tier 2	WS-II	brook stickleback, central stoneroller, creek chub, longnose dace, Northern redbelly dace, finescale dace, razorback sucker, white sucker	March – Nov.	27.5	28.6	
				Dec. – Feb.	13.8	14.3	
	. . . .						
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Uranium 	Acute = e(1.1021[ln(hardness)]+2.7088)	
 	Chronic = e(1.1021[ln(hardness)]+2.2382)	

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Zinc 	Acute = 0.978 * e(0.9094[ln(hardness)]+0.9095)	
 	Chronic =  0.986 * e(0.9094[ln(hardness)]+0.6235) 
if hardness less than 102 mg/l CaCO3 
Chronic (sculpin) = e (2.140[ln(hardness)]-5.084)	
. . . .
34.40	STATEMENT OF BASIS, SPECIFIC STATUTORY AUTHORITY AND PURPOSE; MAY 13, 2013 RULEMAKING; EFFECTIVE DATE SEPTEMBER 30, 2013
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 Commission adopted revisions to Regulation #34 after a rulemaking hearing in September 2012.  Changes to two table value criteria that were made in the 2010 Basic Standards hearing were inadvertently overlooked a the time the proposal for that rulemaking was developed:  revisions to the zinc standard equations and temperature values for the Warm Stream tier 2 subclass.  In today’s action the Commission adopted the corrections to the table values for these parameters in section 34.6.  The changes to the zinc equations were adopted as an emergency temporary action (see 34.39) and as a permanent action.  Since this is the initial implementation of the new temperature standards in this basin it is not anticipated that the changes to the temperature table values will result in adverse impacts in any permitting action or to the public.