How are water quality standards determined? Distinguish between water quality criteria pollutants and maximum contaminant levels

What will be an ideal response?


"On the basis of the latest scientific knowledge, the EPA has listed 158 chemicals and substances as criteria pollutants. The majority of these are toxic chemicals, but many are also natural chemicals or conditions that describe the state of water. The list identifies the pollutant and then recommends concentrations for freshwater, saltwater, and human consumption."
"Drinking water standards are stricter. For these, the EPA has established the Drinking Water Standards and Health Advisories, a set of tables that are updated periodically. These standards, covering some 90 contaminants, are enforceable under the authority of the Safe Drinking Water Act. They are present as maximum contaminant levels."

Environmental & Atmospheric Sciences

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Mineral species can be further subdivided into ________

A) mineral classes B) mineraloids C) evaporites D) varieties

Environmental & Atmospheric Sciences

What variable will determine if light passes through diamond, but not through graphite?

A) the amount of protons present B) the arrangement of the electrons C) the arrangement of the nuclei D) the color of the different bond types

Environmental & Atmospheric Sciences

What is NOT true about a stream’s base level?

A. Temporary base levels can reach below sea level. B. It is the lower limit to a stream’s downcutting. C. It is an imaginary slope extending inland from sea level. D. Ultimate base level is sea level. E. It is the same level across all sections of the stream.

Environmental & Atmospheric Sciences

The air mass with the highest actual water vapor content is:

a. mT b. cT c. mP d. cP

Environmental & Atmospheric Sciences