CWEA ENVIROMENTAL
ANSWERS|LATEST !!!!2026|GRADED A+| (EXAM
Prohibited discharges from industrial users to POTWs, as stipulated in the Clean Water Act,
are pollutants that: - ANSWER create a fire or explosion hazard in the sewer or
POTW.
"MSDS" is an acronym for what? - ANSWER Material Safety Data Sheet
Safety hazards associated with hydrogen sulfide in sewer systems include: -
ANSWER toxic gasses
Lead acetate paper is used to determine the presence of: - ANSWER hydrogen
sulfide.
The following type of flow measuring device can be installed in a pipe flowing full: -
ANSWER Venturi.
What kind of container and preservative is required for samples to be analyzed for oil and
grease? - ANSWER Glass is the best option. Plastic containers are more susceptible
to oils and greases sticking to the inside. If sample analysis is delayed, the sample must be
preserved to a pH <2 with hydrochloric (HCl) or sulfuric acid (H2SO4). Samples must be kept
cool after collection (≤6°C) and packed with a sufficient amount of ice.
A chain-of-custody form: - ANSWER is the ability to trace sample possession and
handling from collection through analysis.
1
,The BOD determination is an empirical test in which standardized laboratory procedures are
used to: - ANSWER The BOD test measures how much oxygen tiny water creatures
need to break down the stuff that pollutes the water, like dead plants or waste from
factories. If the water has a lot of this pollution, these creatures will use up more oxygen to
clean it up, which can make it harder for fish and other animals to live in the water. If the
water is cleaner, they won't need as much oxygen.
A confined space is one that: - ANSWER is large enough to enter and work in, has a
restricted entry/exit, and is not meant for continuous occupancy.
Industrial plants producing wastes with a high suspended solids content include: -
ANSWER breweries.
Whenever an inspector or sampling technician is in a manhole, how many people should
there be above to respond in the event of an emergency? - ANSWER Two
A major pollutant of concern from a printed circuit board shop is: - ANSWER copper.
To find the proper protective gear to use while inspecting an area where a hazardous
chemical is used, you would: - ANSWER check the MSDS for chemicals used.
Why are gasoline and volatile solvents objectionable when present in a sewer? -
ANSWER They can produce an explosion hazard.
When inspecting a plating shop, personal protective equipment would include: -
ANSWER eye goggles or face shield, chemical resistant gloves, and overalls.
A solution with a pH of 5 has a concentration of hydrogen ions that is how many times
higher than a solution with a pH of 7? - ANSWER 100 times higher
2
,High pH wastewater is neutralized by adding: - ANSWER H2SO4 / sulfuric acid
When working in the street, signs and cones are needed when: - ANSWER over half
of the street is blocked.
What is the danger of asphyxiation set point for oxygen on an atmospheric monitor? -
ANSWER 19.5 percent
A common technology to recover chemicals from rinse water include: - ANSWER ion
exchange.
Is an essential part of any sampling quality control methodology: - ANSWER Proper
cleaning techniques for sampling equipment
What are the types of stormwater pollution? - ANSWER Sediment, BOD, Nutrients
How often must Significant industrial users (SIUs) be inspected? - ANSWER Once a
year
A solution of ferrous chloride used at a pretreatment facility contains 30 percent ferrous
chloride and has a density of 1.33 g/mL. How many grams of ferrous chloride are in one liter
of the solution? - ANSWER 399 grams per liter
Sodium hydroxide is commonly referred to as: - ANSWER caustic soda.
Which of the following does an ultrafiltration system remove from wastewater? -
ANSWER suspended solids.
3
, Low pH wastewater is neutralized by adding: - ANSWER Sodium hydroxide NaOH
A POTW must retain Industrial User records for a minimum of: - ANSWER 3 years
The Federal Act that introduced the concept of cradle to grave manifesting for hazardous
waste products is: - ANSWER Resource Conservation and Recovery Act (RCRA).
Waste discharge regulations can be concentration- or mass-based except for: -
ANSWER pH and temperature.
New Categorical Dischargers must submit a Baseline Monitoring Report to the POTW control
authority prior to the planned commencement of discharge by at least: -
ANSWER 90 days
Lead acetate paper is used to determine the presence of: - ANSWER hydrogen
sulfide.
In a normally distributed population of sampling data, what percent of the data points will
fall within one standard deviation? - ANSWER 68 - The empirical rule, also known as
the 68-95-99.7 rule, is a statistical rule which states that for a normal distribution:
Approximately 68% of the data falls within one standard deviation (σ) of the mean (μ).
Approximately 95% of the data falls within two standard deviations of the mean.
Approximately 99.7% of the data falls within three standard deviations of the mean.
In open channel flow measurement, the term "primary element" is used to denote the: -
ANSWER measuring structure that contains the water.
19. You want to measure the flow in an 8-inch diameter city sewer line. If you use the
Manning formula, what additional data will you need to gather to calculate the flow rate in
4
ANSWERS|LATEST !!!!2026|GRADED A+| (EXAM
Prohibited discharges from industrial users to POTWs, as stipulated in the Clean Water Act,
are pollutants that: - ANSWER create a fire or explosion hazard in the sewer or
POTW.
"MSDS" is an acronym for what? - ANSWER Material Safety Data Sheet
Safety hazards associated with hydrogen sulfide in sewer systems include: -
ANSWER toxic gasses
Lead acetate paper is used to determine the presence of: - ANSWER hydrogen
sulfide.
The following type of flow measuring device can be installed in a pipe flowing full: -
ANSWER Venturi.
What kind of container and preservative is required for samples to be analyzed for oil and
grease? - ANSWER Glass is the best option. Plastic containers are more susceptible
to oils and greases sticking to the inside. If sample analysis is delayed, the sample must be
preserved to a pH <2 with hydrochloric (HCl) or sulfuric acid (H2SO4). Samples must be kept
cool after collection (≤6°C) and packed with a sufficient amount of ice.
A chain-of-custody form: - ANSWER is the ability to trace sample possession and
handling from collection through analysis.
1
,The BOD determination is an empirical test in which standardized laboratory procedures are
used to: - ANSWER The BOD test measures how much oxygen tiny water creatures
need to break down the stuff that pollutes the water, like dead plants or waste from
factories. If the water has a lot of this pollution, these creatures will use up more oxygen to
clean it up, which can make it harder for fish and other animals to live in the water. If the
water is cleaner, they won't need as much oxygen.
A confined space is one that: - ANSWER is large enough to enter and work in, has a
restricted entry/exit, and is not meant for continuous occupancy.
Industrial plants producing wastes with a high suspended solids content include: -
ANSWER breweries.
Whenever an inspector or sampling technician is in a manhole, how many people should
there be above to respond in the event of an emergency? - ANSWER Two
A major pollutant of concern from a printed circuit board shop is: - ANSWER copper.
To find the proper protective gear to use while inspecting an area where a hazardous
chemical is used, you would: - ANSWER check the MSDS for chemicals used.
Why are gasoline and volatile solvents objectionable when present in a sewer? -
ANSWER They can produce an explosion hazard.
When inspecting a plating shop, personal protective equipment would include: -
ANSWER eye goggles or face shield, chemical resistant gloves, and overalls.
A solution with a pH of 5 has a concentration of hydrogen ions that is how many times
higher than a solution with a pH of 7? - ANSWER 100 times higher
2
,High pH wastewater is neutralized by adding: - ANSWER H2SO4 / sulfuric acid
When working in the street, signs and cones are needed when: - ANSWER over half
of the street is blocked.
What is the danger of asphyxiation set point for oxygen on an atmospheric monitor? -
ANSWER 19.5 percent
A common technology to recover chemicals from rinse water include: - ANSWER ion
exchange.
Is an essential part of any sampling quality control methodology: - ANSWER Proper
cleaning techniques for sampling equipment
What are the types of stormwater pollution? - ANSWER Sediment, BOD, Nutrients
How often must Significant industrial users (SIUs) be inspected? - ANSWER Once a
year
A solution of ferrous chloride used at a pretreatment facility contains 30 percent ferrous
chloride and has a density of 1.33 g/mL. How many grams of ferrous chloride are in one liter
of the solution? - ANSWER 399 grams per liter
Sodium hydroxide is commonly referred to as: - ANSWER caustic soda.
Which of the following does an ultrafiltration system remove from wastewater? -
ANSWER suspended solids.
3
, Low pH wastewater is neutralized by adding: - ANSWER Sodium hydroxide NaOH
A POTW must retain Industrial User records for a minimum of: - ANSWER 3 years
The Federal Act that introduced the concept of cradle to grave manifesting for hazardous
waste products is: - ANSWER Resource Conservation and Recovery Act (RCRA).
Waste discharge regulations can be concentration- or mass-based except for: -
ANSWER pH and temperature.
New Categorical Dischargers must submit a Baseline Monitoring Report to the POTW control
authority prior to the planned commencement of discharge by at least: -
ANSWER 90 days
Lead acetate paper is used to determine the presence of: - ANSWER hydrogen
sulfide.
In a normally distributed population of sampling data, what percent of the data points will
fall within one standard deviation? - ANSWER 68 - The empirical rule, also known as
the 68-95-99.7 rule, is a statistical rule which states that for a normal distribution:
Approximately 68% of the data falls within one standard deviation (σ) of the mean (μ).
Approximately 95% of the data falls within two standard deviations of the mean.
Approximately 99.7% of the data falls within three standard deviations of the mean.
In open channel flow measurement, the term "primary element" is used to denote the: -
ANSWER measuring structure that contains the water.
19. You want to measure the flow in an 8-inch diameter city sewer line. If you use the
Manning formula, what additional data will you need to gather to calculate the flow rate in
4
