Wastewater Exam 2 Flashcards
An operator should have an opportunity to review the lift station design in the following stages like planning stage, ____% design review, ____% design review, and ____% design review.
20%
40%
90%
The appropriate time to to develop and record both routine and emergency information and procedures for a new lift station is when?
Preliminary inspection
Lift station operation under test conditions will reveal only the ____________ equipment and construction problems.
Immediate
Official acceptance of completed corrective work for a lift station is the ______________ job.
Engineer’s
Mark each piece of lift station equipment with an identification code number and record the number and keep a minimum of ___ copies of this information.
2
When a new lift station is put in, it should be put on the preventative maintenance schedule when?
Right away
If the wet well is to be entered, all __________ _________ entry procedures must be followed.
Confined space
Before entering a wet well, you set up a blower that will give a minimum of _____ air changes a minute within the wet well.
2
If all conditions are satisfactory, then and only then is it permissible to ________ the wet well.
Enter
When stopping a lift station pump you hear a ratcheting sound. That is what engaging?
Backspin preventer
Low head conditions in pumps can be temporarily solved by throttling a discharge valve, or permanently by installing an __________ plate in the discharge.
Orifice
If it is a packing gland used if a pump, set the packing so that there will be leakage of approximately ___ drop per ____________.
1
Second
When making a lift station visit, for safety, how many operators should make the visit?
2
The __________ of the operating agency is the most significant factor determining the frequency of lift station visits.
Attitude
Lift stations should be checked how frequently?
Daily
Monitoring and telemetry systems are frequently referred to as SCADA which stands for?
Supervisory Control And Data Acquisition system
Wherever flows from one sewer meet and join the flow of another, the flow should always be going __________ in the same direction.
Downstream
High velocity cleaners, balls, kites, bags, parachutes, tires and scooters are all apart of what cleaning method?
Hydraulic cleaning
Bucket machines, power rodders, hand rods, and winches for pulling a variety of scraping equipment is apart of what cleaning method?
Mechanical cleaning
The cleansing action of high velocities of water in the line is considered?
Hydraulic cleaning
When cleaning sewer pipes at least __ operators are needed for cleaning lines up to 18 inches.
3
Do not attach a line to one nipple on the sewer cleaning ball, and then another line on the other nipple on the other side because this will reduce the __________ action desired for cleaning.
Swirling
A sewer cleaning ball method will function very well with ____ feet of head in the upstream manhole to create a ____________ velocity around the ball.
2.0
Scouring
When capturing debris from a balling sewer cleaning method, do not use a sand trap or retard the flow because it can hinder the _____________ of the balling operation.
Effectiveness
As the diameter of the pipe gets larger, the hydraulic sewer cleaning method becomes ______ effective.
Less
True or False. You should never throttle or control flow from a fire hydrant with a hydrant valve because this could damage the valve.
True
Always use a hydrant wrench and never use a pipe wrench on the hydrant valve because the valve nut is ______ and can easily be ___________.
Brass
Damaged
When filling hydraulic cleaners from hydrants, never throttle or control water front the hydrant valve. It should be open ____________.
Completely
You must use an _____ _____ for the water going into the tank from the fill line to prevent a cross connection.
Air gap
A 1,000 gallon water tank when full will weigh how much?
8,340 pounds
The lower the angle of the sprayer nozzle in hydraulic cleaners, the higher amount of _______ will be experienced.
Thrust
With high velocity cleaning, the first ___ feet of sewer hose just behind the nozzle will be the first to wear.
10
High velocity cleaning machine is also used for stoppages in sewers. To remove stoppages you would use a nozzle with a __________ jet as well as ______ jets.
Forward
Rear
To avoid blowing toilets with high velocity cleaning method, use a _________ angled nozzle at a minimum pressure when climbing the pipe.
Steeper
Observations of lower than expected flows at a downstream manhole thus indicate that the upstream segment of the line requires additional what?
Cleaning
Kites, bags, and poly pigs describe equipment commonly used to clean __________ diameter sewers.
Larger
Power bucket sewer cleaning machines should only be used in _________ sewers and to avoid using it in __________ sewers.
Larger
Smaller
During power bucket operations, when cleaning small lines you set up in the ___________ manhole. When cleaning larger lines, you set up in the __________ manhole.
Downstream
Upstream
What is one of the first problems encountered during power bucket operations?
Roller security
During sewer rodding operations, use an attachment that is slightly _________ then the pipe itself.
Smaller
When a rodding tool encounters a blockage it will stop rotating but the rodding machine will continue to turn it creating multiple loops in the pipe. This is known as what?
Over torque
The most common method of cleaning a force main is using __________ _______ better known as _______ ______.
Polyurethane swabs
Poly pigs
Odor control is usually obtained by controlling the production of what?
Hydrogen sulfide
One of the most common causes of odors results when the ____ _____ in the sewer above the wastewater is stopped.
Air flow
The major portion of the sulfide content in wastewater arises from the conversion of ________ to ________.
Sulfate
Sulfide
What type of reactions produce sulfide in the slimes?
Anaerobic
In general, the faster and more turbulent the flow, the more oxygen is dissolved, and thus more ________ is oxidized to produce _________.
Sulfide
Sulfate
The higher the wastewater temperature, the __________ the production of hydrogen sulfide.
Greater
Chemical treatment in sewers is not a permanent answer, it provides relief under acuter conditions but is too _____________ for continuous use.
Expensive
Hydrogen sulfide is produced by ________ reducing ___________ organisms that can thrive in wastewater.
Sulfur
Anaerobic
The greater the rate of Biochemical Oxygen Demand (BOD), the greater the rate of what generation?
Sulfide
What is the most widely used chemical for hydrogen sulfide control?
Chlorine
Recent studies have shown that one of the major sources of infiltration is the __________ connection between the house and the _____________ sewer.
Lateral
Mainline
When collection systems are installed above the water table, infiltration is not the problem but ____________ is.
Exfiltration
When doing a TV inspection of a sewer it is only necessary to record video tape of the __________ of the sewer line.
Defects
When the pipes are offset, and the televising camera must drop down to get into the next section of pipe it’s considered a what?
Drop joint
When the pipes are offset, and the televising camera has to be lifted up in order to get into the next section of pipe it’s considered a what?
Jump joint
If a difference of more than one percent in the total distance measured and footage recorded on the log when televising, add an __________ ___________ to the log.
Error Factor
The use of smoke to find the sources of entry into a collection system, broken sewers, and illegal connections is considered what?
Smoke testing
When a number of dye tests are to be conducted on the same sewer line, the dye testing should start at the farthest _________________.
Downstream
What are the three most common hazardous diseases collection systems operators experience?
Tetanus
Typhoid
Polio
Hydrogen sulfide is generated during the _______________ ______________ of organic matter.
Anaerobic
Decomposition
An upper limit of ______ percent oxygen in working atmospheres is recommended.
21.9 %
All employees working within ____ feet of a roadway are required to wear a safety vest.
10 feet
All employees in an agency vehicle while in motion must wear a seatbelt at speeds greater than ____ mph.
5 mph
The most important reason we need wastewater collection systems is what?
Sanitation
Life cycle cost of a piece of equipment has two costs, what are they?
Acquisition cost and
Ongoing costs
Ongoing costs are _____ to _____ times the original acquisition cost for equipment.
- 9
4. 8
Building sewer ________ ________ are used to prevent the passage of gases and odors from the main sewer into a building sewer.
Vent traps
As a minimum, a clean out should be located in the building sewer approximately ____ feet from the building foundation
3
Manholes are usually placed ______ to ______ feet away from one another.
300
500
A speed which will prevent the deposition and buildup of solids in the sewer is called?
Scouring velocity
What connections are primarily used in pump station piping systems where cast or ductile iron piping is common?
Flanged connections
An effective way to minimize short cycling of pumps is to use what alternation?
Automatic Lead/Lag
Selects a different pump every turn
Variable speed pumps adjust the pump speed to _________ the pumping rate with the flow rate into the ______ ________.
Match
Wet well
The wet well atmosphere according to the National Electrical Code is classified as a Class ___, Division ____ area and all electrical systems must be explosion proof.
1
1
Most lift stations have 480V 3-phase power as well as _____/______V, 1 phase.
110/220V
If you are working in the collection system industry you can expect at least a ___ in ____ chance of experiencing a disabling injury.
1 in 10
The greatest return in a safety survival program in the prevention of human _____________.
Suffering
Who reviews, analyzes and determines how each accident occurred and why?
The Safety Committee
What is a space which by design has limited openings for entry and exit; and/or natural ventilation which could contain or produce unfavorable atmospheric conditions; and is not intended or designed for continuous employee occupancy?
Confined space
