2018-03-01_HYDROLOGY - C1981010 ‎(2)‎

• Permit No: C1981010
• IBM Index Class Name: Hydrology
• Doc Date: 3/1/2018
• Doc Name: CDPS/NPDES Permit
• From: Department of Public Health & Environment
• To: DRMS
• Permit Index Doc Type: NPDES
• Email Name: RAR
• Media Type: D
• Archive: No

COLORADO
Water Quality Assessment
Department of Public P
'`486I Health b Environment
produce a predominance of undesirable aquatic life; or (vi) cause a film on the surface or produce a
deposit on shorelines; and
for surface waters in wetlands;
(i) produce color, odor, changes in pH, or other conditions in such a degree as to create a nuisance or harm
water quality dependent functions or impart any undesirable taste to significant edible aquatic species of
the wetland; or (ii) are toxic to humans, animals, plants, or aquatic life of the wetland.
In order to protect the Basic Standards in waters of the state, effluent limitations and/or monitoring
requirements for any parameter of concern could be put in CDPS discharge permits.
Standards for Organic Parameters and Radionuclides
Radionuclides: Statewide Basic Standards have been developed in Section 31.11(2) and (3) of The Basic
Standards and Methodologies for Surface Water to protect the waters of the state from radionuclides and
organic chemicals.
In no case shall radioactive materials in surface waters be increased by any cause attributable to
municipal, industrial, or agricultural practices or discharges to as to exceed the following levels, unless
alternative site-specific standards have been adopted. Standards for radionuclides are shown in Table A-3.
Table A-3
Radionuclide Standards
Parameter
Picocuries per Liter
Americium 241*
0.15
Cesium 134
80
Plutonium 239, and 240"
0.15
Radium 226 and 228*
5
Strontium 90*
8
Thorium 230 and 232*
60
Tritium
20,000
*Radionuclide samples for these materials should be analyzed using unfiltered (total)
samples. These Human Health based standards are 30 -day average values.
Organics: The organic pollutant standards contained in the Basic Standards for Organic Chemicals Table
are applicable to all surface waters of the state for the corresponding use classifications, unless alternative
site-specific standards have been adopted. These standards have been adopted as "interim standards" and
will remain in effect until alternative permanent standards are adopted by the Commission. These interim
standards shall not be considered final or permanent standards subject to antibacksliding or downgrading
restrictions. Although not reproduced in this WQA, the specific standards for organic chemicals can be
found in Regulation 31.11(3).
In order to protect the Basic Standards in waters of the state, effluent limitations and/or monitoring
requirements for radionuclides, organics, or any other parameter of concern could be put in CDPS discharge
permits.
The aquatic life standards for organics apply to all stream segments that are classified for aquatic life. The
water supply standards apply only to those segments that are classified for water supply. The water + fish
standards apply to those segments that have a Class 1 aquatic life and a water supply classification. The fish
ingestion standards apply to Class 1 aquatic life segments that do not have a water supply designation. The
water + fish and the fish ingestion standards may also apply to Class 2 aquatic life segments, where the Water
Quality Control Commission has made such determination.
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4300 Cherry Creek Drive 5., Denver, CO 80246-1530 17303-692-2000 www.colorado.gov/cdphe/wqcd
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