Grade 3 Distribution Review

The disinfection by-products of the distribution system are

HAAs TTHMs chlorine chloramines ozone React with water

Approaching noncompliance levels to prevent noncompliance A system should do what:

Engage Throttle: Reduce the incoming workload, traffic, or production speed by 50% immediately

Before water main is put into service what map drawing is used:

As-Built drawing also known as a Record Drawing must be used

Water flow through a well screen increases from 250 GPM to 500 GPm. Head loss due to water through the well screen is caused how:

increased friction and turbulence as the water velocity increases

Minimum recommended pressure in a water distribution system during low flow condition is:

While regulatory agencies require a strict absolute minimum of 20 psi

What is the probable cause of the appearance of water on the round of the base after foaming the opening dry-barrel hydrant:

the hydrant was only partially opened.

A well with an inter screen is acidized to do what:

dissolve and remove mineral incrustation, scale, and iron deposits

Temporary traffic control devices should be:

uniform, properly maintained, highly visible, and crashworthy

Ammonia is which type of compound:

inorganic compound

Impressed current is what catholic protection:

cathodic protection

Systems use which of the following includes detailed, long-range plans for serving areas within the current service area:

Water System Master Plan Long-Range Water System Plan

Pressure testing water main what percentage greater than the normal operating pressure:

The test pressure must be 50% greater than the normal operating pressure. This means you test the system at 150% (or 1.5 times) the normal working pressure

The sacrificial anode in a catholic is:

usually protecting steel or iron structures.

Pump and motor are not aligned properly causes what:

excessive vibration and premature bearing and seal failure

Which tablet is used to disinfect a new water main:

Calcium Hypochlorite tablets

Slug disinfection of water main:

slug"—of highly concentrated chlorinated water slowly through a new water main to kill bacteria

What units are used to express conductivity:

microSiemens per centimeter uS/cm

Max rate chlorine removal 150 pound cylinder is

40 pounds per day

Exerted electrical fuse continues to blow an operator should do what

troubleshoot the circuit to find the short circuit or overload before replacing the fuse again larger size or jumper wire

Where would the pressure be greatest while the pump station fills a storage tank:

At the discharge side of the pump station

Method commonly used to determine specific capacity of a well:

Pump rate divided by draw down.

Primarily advantage geographic information systems (GIS) is to:

link digital maps with data tables to analyze spatial relationships

New water main trench first layer of back fill should:

clean, select granular material (such as crushed stone, gravel, or sand)

First consideration when determining the type of backflow prevention to be used:

degree of hazard presented by the potential cross-connection.

Stabilize discharge pressure of a variable speed pump:

Lower it to make the speed changes smoother.

Conductivity is a measure of the ability of water in distribution system to:

concentration of dissolved inorganic minerals, salts, and metals (ions) present in the water. (TDS)

Horizontal center line of a pipe is referred to as the:

springline OR spring line

Primarily the purpose for developing maintain and flushing program is to reduce:

customer water quality complaints (specifically by reducing sediment buildup, stagnant water, and biofilm

Testing the LEL sensors Sensor on a gas detectors including:

performing a fresh air calibration, conducting a daily bump test, and doing a full chemical calibration with a known concentration of target gas

Pump output must be measured at a specific pressure condition periodically because:

Without fixing the pressure during a test, you cannot know if a drop in flow is caused by a failing pump or just a change in your piping system.

chlorination of water in the distribution system is used for:

To kill pathogenic organisms" or "to destroy disease-causing bacteria and maintain a residual Accurate Dosing

Chlorine residual and PH of water telemetry system:

monitors chlorine residual and pH in real-time to ensure disinfection efficiency and calculate automatic pH compensation for the chlorine sensors

Feed equipment best used with sodium hypochlorite:

diaphragm-type chemical metering pump specifically a positive displacement diaphragm pump

Membrane filters method for coliform testing hours:

24 hours (specifically 22 to 24 hours

Area between work vehicle and a shadow vehicle is considered the

roll-ahead distance (or roll-ahead space

A blueprint stored 40-60 years apart indicates:

approaching the end of their standard useful design life, highlighting an immediate need for system renewal, asset replacement, and capital improvement planning