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CWEA Environmental Compliance Exam
Questions And Answers 100% Pass
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? -
ANS 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? -
ANS 600, 150, 1450, 2400, 400
Prohibited discharges from industrial users to POTWs, as stipulated in the Clean Water Act, are
pollutants that: - ANS create a fire or explosion hazard in the sewer or POTW.
"MSDS" is an acronym for what? - ANS Material Safety Data Sheet
Safety hazards associated with hydrogen sulfide in sewer systems include: - ANS toxic gasses.
A significant industrial user can be defined as: - ANS a federal categorical industrial user.
Lead acetate paper is used to determine the presence of: - ANS hydrogen sulfide.
, ©EVERLY 2025 ALL RIGHTS RESERVED
What is the average detention time, in minutes, for a 40,000 gpd flow going through a 1,500-
gallon interceptor? - ANS 54 minutes
The following type of flow measuring device can be installed in a pipe flowing full: -
ANS 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. - ANS 305,992 gallons
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? - ANS 0.42 lb/day
What kind of container and preservative is required for samples to be analyzed for oil and
grease? - ANS Glass, Cool 4°C, H2SO4 to pH<2
A chain-of-custody form: - ANS 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: - ANS determine the relative oxygen requirements of wastewaters, effluents, and
polluted waters.
A confined space is one that: - ANS 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: -
ANS breweries.
, ©EVERLY 2025 ALL RIGHTS RESERVED
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? - ANS Two
Alkalinity is reported as: - ANS 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? - ANS 0.0025 N
A major pollutant of concern from a printed circuit board shop is: - ANS copper.
To find the proper protective gear to use while inspecting an area where a hazardous chemical
is used, you would: - ANS check the MSDS for chemicals used.
Why are gasoline and volatile solvents objectionable when present in a sewer? - ANS They
can produce an explosion hazard.
When inspecting a plating shop, personal protective equipment would include: - ANS 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? - ANS 100 times higher
High pH wastewater is neutralized by adding: - ANS H2SO4.
When working in the street, signs and cones are needed when: - ANS over half of the street
is blocked.
What is the danger of asphyxiation set point for oxygen on an atmospheric monitor? -
ANS 19.5 percent
, ©EVERLY 2025 ALL RIGHTS RESERVED
A common technology to recover chemicals from rinse water include: - ANS ion exchange.
Is an essential part of any sampling quality control methodology: - ANS Proper cleaning
techniques for sampling equipment
What are the types of stormwater pollution? - ANS Sediment,BOD,Nutrients
How often must SIUs be inspected? - ANS 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? - ANS 399 grams per liter
Sodium hydroxide is commonly referred to as: - ANS caustic soda.
Which of the following does an ultrafiltration system remove from wastewater? -
ANS suspended solids.
Low pH wstewater is neutralized by adding: - ANS 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? - ANS 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? - ANS 0.0025 N
CWEA Environmental Compliance Exam
Questions And Answers 100% Pass
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? -
ANS 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? -
ANS 600, 150, 1450, 2400, 400
Prohibited discharges from industrial users to POTWs, as stipulated in the Clean Water Act, are
pollutants that: - ANS create a fire or explosion hazard in the sewer or POTW.
"MSDS" is an acronym for what? - ANS Material Safety Data Sheet
Safety hazards associated with hydrogen sulfide in sewer systems include: - ANS toxic gasses.
A significant industrial user can be defined as: - ANS a federal categorical industrial user.
Lead acetate paper is used to determine the presence of: - ANS hydrogen sulfide.
, ©EVERLY 2025 ALL RIGHTS RESERVED
What is the average detention time, in minutes, for a 40,000 gpd flow going through a 1,500-
gallon interceptor? - ANS 54 minutes
The following type of flow measuring device can be installed in a pipe flowing full: -
ANS 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. - ANS 305,992 gallons
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? - ANS 0.42 lb/day
What kind of container and preservative is required for samples to be analyzed for oil and
grease? - ANS Glass, Cool 4°C, H2SO4 to pH<2
A chain-of-custody form: - ANS 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: - ANS determine the relative oxygen requirements of wastewaters, effluents, and
polluted waters.
A confined space is one that: - ANS 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: -
ANS breweries.
, ©EVERLY 2025 ALL RIGHTS RESERVED
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? - ANS Two
Alkalinity is reported as: - ANS 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? - ANS 0.0025 N
A major pollutant of concern from a printed circuit board shop is: - ANS copper.
To find the proper protective gear to use while inspecting an area where a hazardous chemical
is used, you would: - ANS check the MSDS for chemicals used.
Why are gasoline and volatile solvents objectionable when present in a sewer? - ANS They
can produce an explosion hazard.
When inspecting a plating shop, personal protective equipment would include: - ANS 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? - ANS 100 times higher
High pH wastewater is neutralized by adding: - ANS H2SO4.
When working in the street, signs and cones are needed when: - ANS over half of the street
is blocked.
What is the danger of asphyxiation set point for oxygen on an atmospheric monitor? -
ANS 19.5 percent
, ©EVERLY 2025 ALL RIGHTS RESERVED
A common technology to recover chemicals from rinse water include: - ANS ion exchange.
Is an essential part of any sampling quality control methodology: - ANS Proper cleaning
techniques for sampling equipment
What are the types of stormwater pollution? - ANS Sediment,BOD,Nutrients
How often must SIUs be inspected? - ANS 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? - ANS 399 grams per liter
Sodium hydroxide is commonly referred to as: - ANS caustic soda.
Which of the following does an ultrafiltration system remove from wastewater? -
ANS suspended solids.
Low pH wstewater is neutralized by adding: - ANS 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? - ANS 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? - ANS 0.0025 N
