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58 Cards in this Set

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The term for the combined process which transfer liquid water on earths surface into water in the gas phase in the atmosphere is:

Evapotranspiration

The height to which water will rise in wells located in an artisan aquifer is called the:

Piezometric surface

Quality problems encountered with raw water withdrawn from below the thermocline in stratified lakes usually stem from:

Oxygen depletion

Hardness in water is due to dissolved :

Calcium and Magnesium

The time normally required to obtain total coliform results from the Presumptive Test is:

48 hours

A disinfection by product associated with ozone is:

Bromate

The multiple tube fermentation analysis consists of:

Presumptive, confirmed, and completed tests.

Common mixing methods in the flocculation process include:

Hydraulic mixing, turbine mixers, and horizontal paddle wheels .

Particles that are removed readily by sedimentation and filtration process are:

Suspended

A bacteriological test that measures only the presence or absence of coliform is:

Colilert

Raw surface water taste and odor problems are most likely the result of:

Blue green algae growth.

The purpose of flocculation is:

Increase particle size

Disinfection by products can be formed by the reaction of disinfectants with:

Natural organic matter

The unique ingredient in the confirmed test of the MPN method is:

Brilliant green bile

A primary drinking water regulation is based upon:

Health effects

Alkalinity in drinking water can be contributed by:

Carbonate, bicarbonate and hydroxide.

Increasing disinfectant dosage is likely to lead to an increase in:

Disinfection by products

The main advantage of chloramination over chlorination is:

Reduced by product formation.

The term "CT" stands for:

The product of residual concentration multiplied by disinfection time.

In the colilert method, the presence of E. Coli can be detected:

In 24 hours.

The concentration of available chlorine in chlorine gas from 1 ton containers is:

100%

The device used to regulate and control the rate of feed of chlorine gas is called a:

Chlorinator

This is a secondary drinking water standard:

Odor

Chlorine residual is measured in the field using the:

DPD colorimetric method.

The device that generates the vacuum conditions for chlorine gas application is called a:

Eductor

Algae growth in untreated surface water reservoirs can be reduced by applying:

Copper sulfate

The vertical distance between the static water level and the pumping water level in an operating well is known as the:

Drawdown

The main focus of the surface water treatment rule is the control of:

Pathogens

Bacteria and viruses are particles of a size category that is called:

Colloidal

The main purpose of coagulation is to:

Destabilize colloidal particles

Colloidal particles resist coalescing and coagulation because of their:

Surface charge

To comply with the surface water treatment rule, plants must address pathogens by:

Physical removal and chemical inactivation

A chemical frequently applied prior to coagulation is:

Chlorine

The most common form of coagulant aid is:

Cationic polymer

This treatment technology is approved by the SWTR:

Diatomaceous earth filtration

When flocculation mixing intensity drops from stage to stage, it is termed:

Tapered flocculation

The layer of a stratified lake that is most likely to be impacted by algae is called the:

Epilimnion

Typical filtration rates for dual media filters in conventional treatment plants are:

2-6 gallons per minute per square foot.

The single most important indicator of filter performance is the removal of:

Turbidity

As a typical filter run proceeds , head loss in the filter media will:

Gradually increase

A chemical that is frequently applied just prior to filtration is:

Anionic or nonionic polymer

The most common reason for ending a filter run is:

Terminal head loss

A common form of sludge removal in rectangular sedimentation basins is:

Chain and flight collectors

This is likely to occur within the first few minutes after a filter has been backwashed:

Initial turbidity spike

A filter contains 24" of anthracite coal over 12" of sand over 12" of gravel. Such a filter is termed:

A dual media filter

A clay layer in the soil resists the flow of groundwater. Such a layer is called:

An aquitard.

During a filter run, the varying head loss associated with particle capture is offset mechanically by the automatic adjustment of the:

Filter effluent valve

The lowest reportable concentration of any constituent in drinking water is the:

Detection level for reporting

If you encounter a liquid chlorine leak in a one ton container, what action should you take first, to reduce the severity of the leak?

Rotate the container to place the leak at the top.

Chlorine is applied at a dosage rate of 2.5 mg/l. After a reaction time of over 4 hours in the clear wells, the chlorine residual is 1.5 mg/l. What is the chlorine demand?

1.0 mg/l

The biological transformation of liquid water into gaseous water vapor is called:

Transpiration

The surest indicator that any single tube in a multiple tube fermentation test has positive results is:

Gas formation

The surface water treatment rule requires that the combined removal and inactivation of Giardia cysts must be at least:

3.0 logs

The pH value of pure water is:

7.0

The fusible plug that is in all chlorine containers:

Should never be removed or tampered with.

Secondary drinking water standards are generally based upon:

Aesthetic properties

The term for a water bearing formation in the soil:

Aquifer

An aquifer is usually composed of:

Sand and gravel