5 Colo. Code Regs. § 1002-38-1

Current through Register Vol. 47, No. 11, June 10, 2024
Appendix 5 CCR 1002-38-1 - Stream Classifications and Water Quality Standards Tables

Effective 04/30/2024

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 #38 STREAM CLASSIFICATIONS and WATER QUALITY STANDARDS

Upper South Platte River Basin

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REGULATION #38 STREAM CLASSIFICATIONS and WATER QUALITY STANDARDS

Cherry Creek Basin

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REGULATION #38 STREAM CLASSIFICATIONS and WATER QUALITY STANDARDS

Bear Creek Basin

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REGULATION #38 STREAM CLASSIFICATIONS and WATER QUALITY STANDARDS

Clear Creek Basin

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REGULATION #38 STREAM CLASSIFICATIONS and WATER QUALITY STANDARDS

Big Dry Creek Basin

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REGULATION #38 STREAM CLASSIFICATIONS and WATER QUALITY STANDARDS

Boulder Creek Basin

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REGULATION #38 STREAM CLASSIFICATIONS and WATER QUALITY STANDARDS

St. Vrain Creek Basin

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REGULATION #38 STREAM CLASSIFICATIONS and WATER QUALITY STANDARDS

Middle South Platte River Basin

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REGULATION #38 STREAM CLASSIFICATIONS and WATER QUALITY STANDARDS

Big Thompson River Basin

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REGULATION #38 STREAM CLASSIFICATIONS and WATER QUALITY STANDARDS

Cache La Poudre River Basin

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REGULATION #38 STREAM CLASSIFICATIONS and WATER QUALITY STANDARDS

Laramie River Basin

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REGULATION #38 STREAM CLASSIFICATIONS and WATER QUALITY STANDARDS

Lower South Platte River Basin

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REGULATION #38 STREAM CLASSIFICATIONS and WATER QUALITY STANDARDS

Republican 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 38.6 for further details on applied standards.

STREAM CLASSIFICATIONS and WATER QUALITY STANDARDS - FOOTNOTES

(A) Whenever a range of standards is listed and referenced to tinis footnote, tine first number in tine 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) Assessment of adequate refuge shall rely on the Cold Large Lake table value temperature criterion and applicable dissolved oxygen standard rather than the site-specific temperature standard.

5 CCR 1002-38-1

38 CR 03, February 10, 2015, effective 6/30/2015
38 CR 17, September 10, 2015, effective 12/31/2015
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
40 CR 09, May 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
42 CR 04, February 25, 2019, effective 6/30/2019
43 CR 03, February 10, 2020, effective 6/30/2020
43 CR 17, September 10, 2020, effective 12/31/2020
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
45 CR 21, November 10, 2022, effective 11/30/2022
46 CR 10, May 25, 2023, effective 6/14/2023
46 CR 21, November 10, 2023, effective 12/31/2023
47 CR 05, March 10, 2024, effective 4/30/2024