MINNESOTA WASTEWATER TREATMENT
FACILITY (SUBSURFACE SEWAGE
TREATMENT SYSTEM) INSTALLER EXAM
QUESTIONS WITH CORRECTLY VERIFIED
ANSWERS
What is the primary purpose of spray irrigation - Correct Answers -Removal of nutrient
What is the discharge limit allowed for fecal coliform of the discharge (effluent) from a WWTF? -
Correct Answers -200 mg/l
How many foot pounds is equal to 1 horsepower? - Correct Answers -33,000 ft-lb
How many Watts is equal to 100 KW - Correct Answers -100,000
which of the following is not a method used to clean a sanitary sewer - Correct Answers -High
pressure air
Which of the following is a method to use to clean a sanitary sewer? - Correct Answers -flushing
- jetting
- balling-
-rodding
-bucketing
How far below the pond surface, in a cell, should a water sample be taken? - Correct Answers -1
ft below
(8ft to the sides)
,The functions of the chlorine injector valve seat is? - Correct Answers -prevent water from
flowing into the gas chlorine lines
Aerated pond cells are limited to a depth of - Correct Answers -15 feet
stabilization ponds are limited to a depth of - Correct Answers -2-6 feet
why does spray irrigation pond system require 210 days of storage for the water being treated? -
Correct Answers -The ground need to be "frost free" before irrigating can be performed
what is the formula for calculating the circumference of a circle - Correct Answers -3.14 x D
All chlorine residual is said to be removed if the measure residual is __________ or less -
Correct Answers -0/038 mg/l
Which of the following is not a positive displacement pump - Correct Answers -end suction
centrifugal
which of the following is the largest volume of liquid - Correct Answers -300 deciliters
What is the major source of oxygen in a stabilization pond system - Correct Answers -Algae
(most D.O)
The average BOD received by a domestic WWTF is - Correct Answers -200-250 mg/l (Tss is the
same)
How does an operator handle floating material in a lift station - Correct Answers -remove with a
vac truck
,What is a pathogen - Correct Answers -a disease causing organism
which of the following gases has the last amount of weight per cubic foot? - Correct Answers -
Methane
what is a corbel - Correct Answers -a stop used for a floating digester cover
the MINIMUM diameter allowed for a manhole cover is? - Correct Answers -27 inches
*opening is 24 inches*
NPDES monthly reports must be submitted to the MPCA no later than the ____ day of the
following month the information is attained - Correct Answers -21 of every month
Chlorine leaks are detected with _____ strength of ammonia and is signified by a white cloud
when a leak is present - Correct Answers -26% Baume solution of ammonia
When televising a sanitary sewer line, what direction should the TV camera be pulled? - Correct
Answers -with the flow
during a smoke test if smoke comes out of the roof vent what does this indicate? - Correct
Answers -The house vent is working as intended
The minimum sewer service line to a residential property is ? - Correct Answers -4 inches
What is ex-filtration - Correct Answers -wastewater leaving the sanitary sewer through cracks
and joints
, House service lines can be a major source of inflow and infiltration - Correct Answers -true
an OHM is a measure of electrical - Correct Answers -resistance
a requirement to manually calibrate a lift station (time clocks/run time meters) is? - Correct
Answers -a pump
What causes crumbling of the concrete in a lift station and man-holes - Correct Answers -
hydrogen sulfide gas
In order list the following back flow prevention devices from most protection to least protection
- Correct Answers -1. physical air gap
2 RPZ
3. double check valve
4. single swing check valve
5. ball check vavle
6. vaccum breaker
"Gunite" can be used to restore old brick sewers in danger of collapse? - Correct Answers -true
When is solid sheeting shoring used? - Correct Answers -in soil materials that will NOT stand
vertical
Which of the following devices is most accurate - Correct Answers -Gravimetric feeder
What distance should a water main and a sewer main be separated by when they intersect each
other? - Correct Answers -18 inches
FACILITY (SUBSURFACE SEWAGE
TREATMENT SYSTEM) INSTALLER EXAM
QUESTIONS WITH CORRECTLY VERIFIED
ANSWERS
What is the primary purpose of spray irrigation - Correct Answers -Removal of nutrient
What is the discharge limit allowed for fecal coliform of the discharge (effluent) from a WWTF? -
Correct Answers -200 mg/l
How many foot pounds is equal to 1 horsepower? - Correct Answers -33,000 ft-lb
How many Watts is equal to 100 KW - Correct Answers -100,000
which of the following is not a method used to clean a sanitary sewer - Correct Answers -High
pressure air
Which of the following is a method to use to clean a sanitary sewer? - Correct Answers -flushing
- jetting
- balling-
-rodding
-bucketing
How far below the pond surface, in a cell, should a water sample be taken? - Correct Answers -1
ft below
(8ft to the sides)
,The functions of the chlorine injector valve seat is? - Correct Answers -prevent water from
flowing into the gas chlorine lines
Aerated pond cells are limited to a depth of - Correct Answers -15 feet
stabilization ponds are limited to a depth of - Correct Answers -2-6 feet
why does spray irrigation pond system require 210 days of storage for the water being treated? -
Correct Answers -The ground need to be "frost free" before irrigating can be performed
what is the formula for calculating the circumference of a circle - Correct Answers -3.14 x D
All chlorine residual is said to be removed if the measure residual is __________ or less -
Correct Answers -0/038 mg/l
Which of the following is not a positive displacement pump - Correct Answers -end suction
centrifugal
which of the following is the largest volume of liquid - Correct Answers -300 deciliters
What is the major source of oxygen in a stabilization pond system - Correct Answers -Algae
(most D.O)
The average BOD received by a domestic WWTF is - Correct Answers -200-250 mg/l (Tss is the
same)
How does an operator handle floating material in a lift station - Correct Answers -remove with a
vac truck
,What is a pathogen - Correct Answers -a disease causing organism
which of the following gases has the last amount of weight per cubic foot? - Correct Answers -
Methane
what is a corbel - Correct Answers -a stop used for a floating digester cover
the MINIMUM diameter allowed for a manhole cover is? - Correct Answers -27 inches
*opening is 24 inches*
NPDES monthly reports must be submitted to the MPCA no later than the ____ day of the
following month the information is attained - Correct Answers -21 of every month
Chlorine leaks are detected with _____ strength of ammonia and is signified by a white cloud
when a leak is present - Correct Answers -26% Baume solution of ammonia
When televising a sanitary sewer line, what direction should the TV camera be pulled? - Correct
Answers -with the flow
during a smoke test if smoke comes out of the roof vent what does this indicate? - Correct
Answers -The house vent is working as intended
The minimum sewer service line to a residential property is ? - Correct Answers -4 inches
What is ex-filtration - Correct Answers -wastewater leaving the sanitary sewer through cracks
and joints
, House service lines can be a major source of inflow and infiltration - Correct Answers -true
an OHM is a measure of electrical - Correct Answers -resistance
a requirement to manually calibrate a lift station (time clocks/run time meters) is? - Correct
Answers -a pump
What causes crumbling of the concrete in a lift station and man-holes - Correct Answers -
hydrogen sulfide gas
In order list the following back flow prevention devices from most protection to least protection
- Correct Answers -1. physical air gap
2 RPZ
3. double check valve
4. single swing check valve
5. ball check vavle
6. vaccum breaker
"Gunite" can be used to restore old brick sewers in danger of collapse? - Correct Answers -true
When is solid sheeting shoring used? - Correct Answers -in soil materials that will NOT stand
vertical
Which of the following devices is most accurate - Correct Answers -Gravimetric feeder
What distance should a water main and a sewer main be separated by when they intersect each
other? - Correct Answers -18 inches
