Chapter 2, the hazards of backflow

Question 1

These are low hazards, that are also agents that do not cause disease, but they do decrease the aesthetic quality of water.

Answer 1

Biological pollutants

Question 2

Lactobacillus is a type of bacteria used in the production of yogurt. What is it classified as in relation to backflow?

Answer 2

A biological pollutant

Question 3

These are agents that cause disease. Examples include bacteria, viruses, protozoa, algae, etc..

Answer 3

Biological contaminants

Question 4

This biological contaminant is the bacteria that causes legionnaires disease

Answer 4

Legionella

Question 5

Legionella is commonly found in what locations

Answer 5

Cooling towers, evaporators, condensers, and hot water tanks.

Question 6

Modern treatment processes can effectively kill or remove most of the organisms. However, when contaminants backflow into the distribution system, treatment becomes somewhat irrelevant since the treatment system process has been:

Answer 6

Bypassed

Question 7

These are created when ammonia is used in combination with chlorine

Answer 7

Chloramines

Question 8

Which is more effective at killing biological contaminants, chlorine or chloramines?

Answer 8

Chlorine

Question 9

Water Quality Monitoring frequencies are determined based on what?

Answer 9

Size of population

Question 10

What is the minimum requirement for residual chlorine in a public water supply?

Answer 10

0.2 PPM

Question 11

What is the minimum combined chlorine residual where chloramines are used?

Answer 11

0.6ppm

Question 12

What is generally considered a better test for determining if the portable water system has been contaminated?

Answer 12

Testing the water for total coliforms

Question 13

This is the amount of time that has passed between the ingestion of or contact with the biological agent and the first disease symptoms

Answer 13

Onset time

Question 14

______ is the ability of an organism to make an individual ill.

Answer 14

Pathogenicity

Question 15

______ is how ill the organism will make the individual

Answer 15

Virulence

Question 16

________ is the term used when backflow preventers are installed at each possible point of contamination.

Answer 16

Isolation

Question 17

______ is the term used when backflow prevention assemblies are used to keep contaminants from entering the distribution system from a water consumers facility

Answer 17

Containment, or service protection

Question 18

Chemical pollutants are substances that do not pose a public health threat, but reduce the:

Answer 18

Aesthetic water quality

Question 19

Chemical contaminants are substances that pose a threat to:

Answer 19

Public health

Question 20

_____ refers to the poisonous nature of a chemical and varies widely

Answer 20

Toxicity

Question 21

Often funding for backflow prevention programs is insufficient because of the costs of the program are more apparent than the

Answer 21

Benefits