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Water: Module 5

Basic Course: Key Concepts (Module 5m)

Module 5. Water Quality Flexibilities

« Page 14 of 14 »

Brief Topic Quiz

To complete your review of the topic in this module, please take the self-assesement quiz by reviewing each question and considering the possible responses.

A note about the quiz:

At the bottom of this page are the answers and the password for this section. You will need each password in each of the six modules to obtain your Certificate of Completion at the end of the course.

Answer each of the questions below

1. True or False Statement: A use attainability analysis (UAA) is required when changing a designated use that addresses the CWA 101(a)(2) goal.
  1. True
  2. False
2. Which of the following does NOT need to be included in a use attainability analysis that focuses on the economic factor (i.e., "substantial and widespread economic and social impact")?
  1. Cost of the treatment approach.
  2. Cost-benefit analysis.
  3. Whether the discharger can afford more stringent controls.
  4. What the effect of higher costs would be on the community.
3. True or False Statement: All water quality standards are suspended when a variance is issued.
  1. True
  2. False
4. Site-specific criteria can be used to address which of the following situations?
  1. The sensitivities of species at a site differ from those used to develop national water quality criteria.
  2. It is desirable to establish criteria equal to “natural background” levels.
  3. The physical or chemical characteristics of a site alter the bioavailability/toxicity of a pollutant.
  4. Any one of the above.
5. True or False Statement: State/Tribal water quality regulations and an NPDES permit may allow a discharger additional time to comply with permit limits based on new or revised criteria.
  1. True
  2. False

Answers and Password

  1. True or False Statement: A use attainability analysis (UAA) is required when removing a designated use that addresses the CWA 101(a)(2) goal.

    Answer: True. In addition, a UAA is required when revising WQS to adopt a subcategory that would require less stringent criteria

  2. Which of the following does NOT need to be included in a use attainability analysis that focuses on the economic factor (i.e., "substantial and widespread economic and social impact")?

    Answer: Cost-benefit analysis. Making the economic case for changing a designated use does not call for conducting a cost-benefit analysis.

  3. True or False Statement: All water quality standards are suspended when a variance is issued.

    Answer: False. Although a variance must be incorporated into a State/Tribe's water quality standards, the underlying standards remain in place. Since variances are usually pollutant specific, water quality standards as applicable to other pollutants remain unchanged.

  4. Site-specific criteria can be used to address which of the following situations?

    Answer: Any of the above (The sensitivities of species at a site differ from those used to develop national water quality criteria; it is desirable to establish criteria equal to “natural background” levels; the physical or chemical characteristics of a site alter the bioavailability/toxicity of a pollutant).

  5. True or False Statement: State/Tribal water quality regulations and an NPDES permit may allow a discharger additional time to comply with permit limits based on new or revised criteria.

    Answer: True. This can be addressed with the addition of a compliance schedule in the discharger's NPDES permit that establishes a timetable requiring compliance as soon as possible. However, the State/Tribe's water quality standards or implementing regulations must specifically authorize the use of compliance schedules in NPDES permits.

The password for this module is ‘flexibility'. This concludes Module 5. Please continue to Module 6.


Disclaimer:
For informational purposes only–Not official statements of EPA policy.

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