The lower strata being colder than the upper strata.
The upper strata becoming denser and sinking to the bottom.
The upper and lower strata reaching the same temperature.
Decaying organic matter causing a gaseous movement.
Sodium and potassium
Nitrogen and sulfur
Fluoride and oxygen
Calcium and magnesium
A free chlorine residual greater then 1.0 MG/L
Water that tends to be corrosive.
Extremely high total solids contact.
Causes pipes to corrode
Increases trihalomethanes (THMs)
Stains plumbing and clothes.
A pressure reducer.
A platform scale.
0.05 Parts per million.
0.5 Parts per million.
1 parts per million.
5.0 parts per million.
Have no effect
Colorless, flammable, heavier than air
Greenish-yellow, nonflammable, lighter than air.
Greenish-yellow, flammable, lighter than air.
Greenish-yellow, nonflammable, heavier than air.
The difference between the amount of chlorine added and turbidity.
The difference between the amount of chlorine added and pH
The difference between the total chlorine residual and the free chlorine residual
The difference between the amount of chlorine added and the amount of residual chlorine remaining after a given contact time.
Authority by the states to supersede USEPA drinking water regulations.
Authority by the USEPA to supersede state drinking water regulations.
Requirement for states to maintain drinking water regulations more stringent than USEPA regulations.
Primary authority for implementation and enforcement of drinking water regulations.
Impaired mental functioning in children
Prostate cancer in men
Stomach and intestinal disorders.
Reduced white blood cell count
Waters ability to neutralize acid
Hydrogen ion activity
Activated carbon canister type
Potassium tetroxide canister type
Self-contained breathing apparatus.
Oxygen supply apparatus.
Gallons per man.
Gallons per man-hour.
Gallons per mile of pipe.
Gallons per minute.
A commercially available chlorine solution.
A commercially available dry chlorine compound
Chlorine that is available in 100- and 150-pound cylinders.
A reaction product of chlorine and caustic soda.
Buffer chlorine solutions.
Neutralize chlorine residual.
Detect chlorine leaks
Sterilize sample bottles.
The presence of pathogens.
The absence of adequate chlorine residual.
The existence of an urgent public health problem.
The potential presence of pathogen.
Used to measure residual chlorine.
Used in the treatment of iron and turbidity.
Used to feed a liquid solution into a water supply.
Used to measure an adequate amount of chlorine gas into the supply.
Increased trihalomethanes (THMs)
Tastes and odors.
Pumping water level in a well.
Upper surface of the groundwater.
Water level in a reserve.
Bottom of the aquifer.
Acute gastrointestinal diseases.
Nervous system disorders.
Calcium and magnesium sulfates.
Total dissolved solids.
Acute respiratory diseases.
'blue baby" syndrome.
Reduced I.Q. in children.
Taste and odor problems.
Red water will soon become a problem.
The water has been corrosive.
The water is chemically unstable and is depositing.
Water should flow easier since the lining is smooth
Dissolved in water, allowed to settle, and the supernatant siphoned off and fed into the water system.
Dissolved in water as a dry chemical then injected into the water system.
Fed as a dry chemical directly into the pipeline.
Fed as a dry powder into the clear well.
Rainwater that soaks into the ground.
Rain that returns to the atmosphere from the earth's surface.
Surface water that overflows the bank of rivers.
Water that flows into rivers after a rainfall.
Lower the pH.
Reduce concentrations of dissolved gases.
Stabilize chlorine residuals.
2 hours 10 min
5 hours 4 min
35 hours 23 minutes
76 hours 3 minutes
Decrease the strength of the brine used in the regeneration stage.
Increase backwash flow rates.
Increase duration of backwash stage.
Increase duration of service stage.
Be totally airtight.
Have both the overflow pipe and the vent screened.
Have cathodic protection
Have its interior surface coated with an AWWA-approved paint system.