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COLORADO
<br />x Water Quality Assessment
<br />\` Department of Public
<br />'' e? Health b Environment
<br />examines alternatives that may result in no degradation or less degradation, and are economically,
<br />environmentally, and technologically reasonable. If the proposed activity is determined to be important
<br />economic or social development, a determination shall be made whether the degradation that would result
<br />from such regulated activity is necessary to accommodate that development. The result of an AA may be an
<br />alternate limitation between the ADBEL and the WQBEL, and therefore the ADBEL would not be applied. This
<br />option can be further explored with the Division. See Regulation 31.8 (3)(d) and the Antidegradation
<br />Guidance for more information regarding an alternatives analysis.
<br />VIII. References
<br />Regulations:
<br />The Basic Standards and Methodologies for Surface Water, Regulation 31, Colorado Department Public Health
<br />and Environment, Water Quality Control Commission, effective March 1, 2017.
<br />Classifications and Numeric Standards for Lower Colorado River Basin, Regulation No. 37, Colorado
<br />Department Public Health and Environment, Water Quality Control Commission, effective June 30, 2017.
<br />Colorado River Salinity Standards, Regulation 39, CDPHE, WQCC (last update effective 8/30/97)
<br />Regulations for Effluent Limitations, Regulation 62, CDPHE, WQCC, July 30, 2012.
<br />Colorado's Section 303(d) List of Impaired Waters and Monitoring and Evaluation List, Regulation 93,
<br />Colorado Department Public Health and Environment, Water Quality Control Commission, effective November
<br />30, 2016.
<br />Policy and Guidance Documents:
<br />Antidegradation Significance Determination for New or Increased Water Quality Impacts, Procedural
<br />Guidance, Colorado Department Public Health and Environment, Water Quality Control Division, December
<br />2001.
<br />Memorandum Re: First Update to (Antidegradation) Guidance Version 1.0, Colorado Department Public
<br />Health and Environment, Water Quality Control Division, April 23, 2002.
<br />Rationale for Classifications, Standards and Designations of Segments of the Lower Colorado River Basin,
<br />Colorado Department Public Health and Environment, Water Quality Control Division, effective June 30,
<br />2017.
<br />Colorado Mixing Zone Implementation Guidance, Colorado Department Public Health and Environment,
<br />Water Quality Control Division, effective April 2002.
<br />Policy for Conducting Assessments for Implementation of Temperature Standards in Discharge Permits,
<br />Colorado Department Public Health and Environment, Water Quality Control Division Policy Number WQP-23,
<br />effective July 3, 2008.
<br />Implementing Narrative Standards in Discharge Permits for the Protection of Irrigated Crops, Colorado
<br />Department Public Health and Environment, Water Quality Control Division Policy Number WQP-24, effective
<br />March 10, 2008.
<br />Policy for Characterizing Ambient Water Quality for Use in Determining Water Quality Standards Based
<br />Effluent Limits, Colorado Department Public Health and Environment, Water Quality Control Division Policy
<br />Number WQP-19, effective May 2002.
<br />Other:
<br />Pave 40 of 40
<br />4300 Cherry Creek Drive S., Denver, CO 80246-1530 303-692-2000 www.cotorado.gov/cdphe/wqcd I
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