1|Page
CWEA ENVIRONMENTAL COMPLIANCE EXAM 2025|
BRAND NEW ACTUAL EXAM WITH 100% VERIFIED
QUESTIONS AND CORRECT SOLUTIONS|
GUARANTEED VALUE PACK| ACE YOUR GRADES.
An industry operating an 8-hour shift, 5 days per week, generates 100,000 gallons of
wastewater per shift. Their pretreatment system has a capacity of 150 gallons per
minute. How long must the pretreatment facility operate to process the wastewater
generated each day? - (answers)11.1 hours
An industry has five sewer connections with the following discharge rates: 1) 300 gpd,
2) 75 gpd, 3) 725 gpd, 4) 1,200 gpd, 5) 200 gpd A flow-weighted composite sample of 5
liters is desired. How many milliliters of sample from each connection should be
composited? - (answers)600, 150, 1450, 2400, 400
Prohibited discharges from industrial users to POTWs, as stipulated in the Clean Water
Act, are pollutants that: - (answers)create a fire or explosion hazard in the sewer or
POTW.
"MSDS" is an acronym for what? - (answers)Material Safety Data Sheet
Safety hazards associated with hydrogen sulfide in sewer systems include: -
(answers)toxic gasses.
A significant industrial user can be defined as: - (answers)a federal categorical industrial
user.
Lead acetate paper is used to determine the presence of: - (answers)hydrogen sulfide.
What is the average detention time, in minutes, for a 40,000 gpd flow going through a
1,500-gallon interceptor? - (answers)54 minutes
The following type of flow measuring device can be installed in a pipe flowing full: -
(answers)Venturi.
What total volume of spill containment capacity in gallons is needed for the following
tanks if a 12-inch rainfall occurs during a 24-hour period on a common 200-foot by 200-
foot spill-containment pad? Assume 100 percent containment of all tank capacity is
needed. Tank I: Cube, 6 ft wide, 6 ft long, and 6 ft high. Tank II: Rectangular, 4 ft wide,
20 ft long, and 3 ft high. Tank III: Cylindrical, 8 ft in diameter and 9 ft high. -
(answers)305,992 gallons
,2|Page
An industry has a wastewater discharge of 10,000 gallons per day containing 5 mg/L of
copper. What is the industry's mass emission rate of copper in pounds per day? -
(answers)0.42 lb/day
What kind of container and preservative is required for samples to be analyzed for oil
and grease? - (answers)Glass, Cool 4°C, H2SO4 to pH<2
A chain-of-custody form: - (answers)is the ability to trace sample possession and
handling from collection through analysis.
The BOD determination is an empirical test in which standardized laboratory procedures
are used to: - (answers)determine the relative oxygen requirements of wastewaters,
effluents, and polluted waters.
A confined space is one that: - (answers)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: -
(answers)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? - (answers)Two
Alkalinity is reported as: - (answers)alkalinity, mg/L CaCO3.
What is the normality of sodium hydroxide (NaOH) solution of 25 mL if a 0.01 N sulfuric
acid solution neutralizes 100 mL of the NaOH solution? - (answers)0.0025 N
A major pollutant of concern from a printed circuit board shop is: - (answers)copper.
To find the proper protective gear to use while inspecting an area where a hazardous
chemical is used, you would: - (answers)check the MSDS for chemicals used.
Why are gasoline and volatile solvents objectionable when present in a sewer? -
(answers)They can produce an explosion hazard.
When inspecting a plating shop, personal protective equipment would include: -
(answers)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? - (answers)100 times higher
High pH wastewater is neutralized by adding: - (answers)H2SO4.
When working in the street, signs and cones are needed when: - (answers)over half of
the street is blocked.
, 3|Page
What is the danger of asphyxiation set point for oxygen on an atmospheric monitor? -
(answers)19.5 percent
A common technology to recover chemicals from rinse water include: - (answers)ion
exchange.
Is an essential part of any sampling quality control methodology: - (answers)Proper
cleaning techniques for sampling equipment
What are the types of stormwater pollution? - (answers)Sediment,BOD,Nutrients
How often must SIUs be inspected? - (answers)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? - (answers)399 grams per liter
Sodium hydroxide is commonly referred to as: - (answers)caustic soda.
Which of the following does an ultrafiltration system remove from wastewater? -
(answers)suspended solids.
Low pH wstewater is neutralized by adding: - (answers)NaOH.
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? - (answers)100 times higher
What is the normality of a sodium hydroxide solution of 25 ml if 0.01 N sulfuric acid
solution neutralizes 100 mL of the NaOH solution? - (answers)0.0025 N
A cyanide destruction process is designed to treat 30 pounds of cyanide per 24-hour
operational day. How many pounds of cyanide can be treated during an 8-hour shift? -
(answers)10
A POTW must retain Industrial User records for a minimum of: - (answers)3 years
The Federal Act that introduced the concept of cradle to grave manifesting for
hazardous waste products is: - (answers)Resource Conservation and Recovery Act
(RCRA).
Waste discharge regulations can be concentration- or mass-based except for: -
(answers)pH and temperature.
CWEA ENVIRONMENTAL COMPLIANCE EXAM 2025|
BRAND NEW ACTUAL EXAM WITH 100% VERIFIED
QUESTIONS AND CORRECT SOLUTIONS|
GUARANTEED VALUE PACK| ACE YOUR GRADES.
An industry operating an 8-hour shift, 5 days per week, generates 100,000 gallons of
wastewater per shift. Their pretreatment system has a capacity of 150 gallons per
minute. How long must the pretreatment facility operate to process the wastewater
generated each day? - (answers)11.1 hours
An industry has five sewer connections with the following discharge rates: 1) 300 gpd,
2) 75 gpd, 3) 725 gpd, 4) 1,200 gpd, 5) 200 gpd A flow-weighted composite sample of 5
liters is desired. How many milliliters of sample from each connection should be
composited? - (answers)600, 150, 1450, 2400, 400
Prohibited discharges from industrial users to POTWs, as stipulated in the Clean Water
Act, are pollutants that: - (answers)create a fire or explosion hazard in the sewer or
POTW.
"MSDS" is an acronym for what? - (answers)Material Safety Data Sheet
Safety hazards associated with hydrogen sulfide in sewer systems include: -
(answers)toxic gasses.
A significant industrial user can be defined as: - (answers)a federal categorical industrial
user.
Lead acetate paper is used to determine the presence of: - (answers)hydrogen sulfide.
What is the average detention time, in minutes, for a 40,000 gpd flow going through a
1,500-gallon interceptor? - (answers)54 minutes
The following type of flow measuring device can be installed in a pipe flowing full: -
(answers)Venturi.
What total volume of spill containment capacity in gallons is needed for the following
tanks if a 12-inch rainfall occurs during a 24-hour period on a common 200-foot by 200-
foot spill-containment pad? Assume 100 percent containment of all tank capacity is
needed. Tank I: Cube, 6 ft wide, 6 ft long, and 6 ft high. Tank II: Rectangular, 4 ft wide,
20 ft long, and 3 ft high. Tank III: Cylindrical, 8 ft in diameter and 9 ft high. -
(answers)305,992 gallons
,2|Page
An industry has a wastewater discharge of 10,000 gallons per day containing 5 mg/L of
copper. What is the industry's mass emission rate of copper in pounds per day? -
(answers)0.42 lb/day
What kind of container and preservative is required for samples to be analyzed for oil
and grease? - (answers)Glass, Cool 4°C, H2SO4 to pH<2
A chain-of-custody form: - (answers)is the ability to trace sample possession and
handling from collection through analysis.
The BOD determination is an empirical test in which standardized laboratory procedures
are used to: - (answers)determine the relative oxygen requirements of wastewaters,
effluents, and polluted waters.
A confined space is one that: - (answers)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: -
(answers)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? - (answers)Two
Alkalinity is reported as: - (answers)alkalinity, mg/L CaCO3.
What is the normality of sodium hydroxide (NaOH) solution of 25 mL if a 0.01 N sulfuric
acid solution neutralizes 100 mL of the NaOH solution? - (answers)0.0025 N
A major pollutant of concern from a printed circuit board shop is: - (answers)copper.
To find the proper protective gear to use while inspecting an area where a hazardous
chemical is used, you would: - (answers)check the MSDS for chemicals used.
Why are gasoline and volatile solvents objectionable when present in a sewer? -
(answers)They can produce an explosion hazard.
When inspecting a plating shop, personal protective equipment would include: -
(answers)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? - (answers)100 times higher
High pH wastewater is neutralized by adding: - (answers)H2SO4.
When working in the street, signs and cones are needed when: - (answers)over half of
the street is blocked.
, 3|Page
What is the danger of asphyxiation set point for oxygen on an atmospheric monitor? -
(answers)19.5 percent
A common technology to recover chemicals from rinse water include: - (answers)ion
exchange.
Is an essential part of any sampling quality control methodology: - (answers)Proper
cleaning techniques for sampling equipment
What are the types of stormwater pollution? - (answers)Sediment,BOD,Nutrients
How often must SIUs be inspected? - (answers)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? - (answers)399 grams per liter
Sodium hydroxide is commonly referred to as: - (answers)caustic soda.
Which of the following does an ultrafiltration system remove from wastewater? -
(answers)suspended solids.
Low pH wstewater is neutralized by adding: - (answers)NaOH.
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? - (answers)100 times higher
What is the normality of a sodium hydroxide solution of 25 ml if 0.01 N sulfuric acid
solution neutralizes 100 mL of the NaOH solution? - (answers)0.0025 N
A cyanide destruction process is designed to treat 30 pounds of cyanide per 24-hour
operational day. How many pounds of cyanide can be treated during an 8-hour shift? -
(answers)10
A POTW must retain Industrial User records for a minimum of: - (answers)3 years
The Federal Act that introduced the concept of cradle to grave manifesting for
hazardous waste products is: - (answers)Resource Conservation and Recovery Act
(RCRA).
Waste discharge regulations can be concentration- or mass-based except for: -
(answers)pH and temperature.
