Water sources

Question 1

The purpose of surface water intake screen

Answer 1

To remove large solids

Question 2

When surface of lake or reservoir cool at the same temperature as the lower layers the lakes

Answer 2

De stratified and turnover occurs

Question 3

Reaeration and destratifocation are

Answer 3

R- forced air into lower layers replenishing the dissolved oxygen. Rising bubbles cause lower water to rise to surface where oxygen is transferred to water

D- vertical mixing with water body to eliminate separate layers of temperature plant or animal life. Mixing through pumps

Question 4

Gastroenteritis symptoms (3)

Answer 4

1. Nausea
2. Vomiting
3. Diarrhea

Typically not reported

Question 5

Treatment for Coliform contamination

Answer 5

Disinfection, coagulation, flocculation

Question 6

Treatment for turbidity, color and odor

Answer 6

Coagulation, flocculation, sedimentation, filtration

Odors plus oxidation, special oxidation and adsorption

Question 7

Dbp treatment (3)

Answer 7

Disinfection with ozone , chlorine dioxide or chlorination

Question 8

Limestone is easily dissolved by

Answer 8

Carbon dioxide

Question 9

Repeat samples collected within

Answer 9

24 hrs after a positive result