5 Colo. Code Regs. § 1002-32-1

Current through Register Vol. 47, No. 11, June 10, 2024

Appendix 5 CCR 1002-32-1 - Stream Classifications and Water Quality Standards Tables

Effective 12/31/2023

Abbreviations and Acronyms

Aq	= Aquatic
°C	= degrees Celsius
CL	= cold lake temperature tier
CLL	= cold large lake temperature tier
CS-I	= cold stream temperature tier one
CS-II	= cold stream temperature tier two
D.O.	= dissolved oxygen
DM	= daily maximum temperature
DUWS	= direct use water supply
E. coli	= Escherichia coli
EQ	= existing quality
mg/L	= milligrams per liter
mg/m²	= milligrams per square meter
mL	= milliliter
MWAT	= maximum weekly average temperature
OW	= outstanding waters
SSE	= site-specific equation
T	= total recoverable
t	= total
tr	= trout
TVS	= table value standard
µg/L	= micrograms per liter
UP	= use-protected
WS	= water supply
WS-I	= warm stream temperature tier one
WS-II	= warm stream temperature tier two
WS-III	= warm stream temperature tier three
WL	= warm lake temperature tier

REGULATION #32 STREAM CLASSIFICATIONS and WATER QUALITY STANDARDS

Upper Arkansas River Basin

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REGULATION #32 STREAM CLASSIFICATIONS and WATER QUALITY STANDARDS

Middle Arkansas River Basin

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REGULATION #32 STREAM CLASSIFICATIONS and WATER QUALITY STANDARDS

Fountain Creek Basin

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REGULATION #32 STREAM CLASSIFICATIONS and WATER QUALITY STANDARDS

Lower Arkansas River Basin

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REGULATION #32 STREAM CLASSIFICATIONS and WATER QUALITY STANDARDS

Cimarron River Basin

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All metals are dissolved unless otherwise noted.

T = total recoverable

t = total

tr = trout

D.O. = dissolved oxygen

DM = daily maximum

MWAT = maximum weekly average temperature

See 32.6 for further details on applied standards.

STREAM CLASSIFICATIONS and WATER QUALITY STANDARDS - FOOTNOTES

(A) Whenever a range of standards is listed and referenced to this footnote, the first number in the range is a strictly health-based value, based on the Commission's established methodology for human health-based standards. The second number in the range is a maximum contaminant level, established under the federal Safe Drinking Water Act that has been determined to be an acceptable level of this chemical in public water supplies, taking treatability and laboratory detection limits into account. Control requirements, such as discharge permit effluent limitations, shall be established using the first number in the range as the ambient water quality target, provided that no effluent limitation shall require an "end-of-pipe" discharge level more restrictive than the second number in the range. Water bodies will be considered in attainment of this standard, and not included on the Section 303(d) List, so long as the existing ambient quality does not exceed the second number in the range.

(B) Reserved.

5 CCR 1002-32-1

38 CR 03, February 10, 2015, effective 6/30/2015

39 CR 03, February 10, 2016, effective 3/1/2016

39 CR 03, February 10, 2016, effective 6/30/2016

39 CR 23, December 25, 2016, effective 12/30/2016

40 CR 03, February 10, 2017, effective 6/30/2017

41 CR 01, January 10, 2018, effective 1/31/2018

41 CR 03, February 10, 2018, effective 6/30/2018

41 CR 17, September 10, 2018, effective 12/31/2018

42 CR 04, February 25, 2019, effective 6/30/2019

43 CR 03, February 10, 2020, effective 6/30/2020

44 CR 01, January 10, 2021, effective 2/14/2021

44 CR 05, March 10, 2021, effective 6/30/2021

44 CR 17, September 10, 2021, effective 12/31/2021

45 CR 17, September 10, 2022, effective 9/30/2022

46 CR 10, May 25, 2023, effective 6/14/2023

46 CR 21, November 10, 2023, effective 12/31/2023