1
CWEA Environmental Compliance 2025 REAL EXAM
QUESTIONS |MOST TESTED QUESTIONS AND
CORRECT ANSWERS |100% ACCURATE|GET IT
RIGHT!!
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? - (ANSWER)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? - (ANSWER)600, 150, 1450, 2400, 400
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.
A significant industrial user can be defined as: - (ANSWER)a federal categorical
industrial user.
, 2
Lead acetate paper is used to determine the presence of: - (ANSWER)hydrogen
sulfide.
What is the average detention time, in minutes, for a 40,000 gpd flow going
through a 1,500-gallon interceptor? - (ANSWER)54 minutes
The following type of flow measuring device can be installed in a pipe flowing full:
- (ANSWER)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. - (ANSWER)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? - (ANSWER)0.42 lb/day
What kind of container and preservative is required for samples to be analyzed
for oil and grease? - (ANSWER)Glass, Cool 4°C, H2SO4 to pH<2
A chain-of-custody form: - (ANSWER)is the ability to trace sample possession and
handling from collection through analysis.
, 3
The BOD determination is an empirical test in which standardized laboratory
procedures are used to: - (ANSWER)determine the relative oxygen requirements
of wastewaters, effluents, and polluted waters.
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
Alkalinity is reported as: - (ANSWER)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? -
(ANSWER)0.0025 N
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.
, 4
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
High pH wastewater is neutralized by adding: - (ANSWER)H2SO4.
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
CWEA Environmental Compliance 2025 REAL EXAM
QUESTIONS |MOST TESTED QUESTIONS AND
CORRECT ANSWERS |100% ACCURATE|GET IT
RIGHT!!
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? - (ANSWER)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? - (ANSWER)600, 150, 1450, 2400, 400
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.
A significant industrial user can be defined as: - (ANSWER)a federal categorical
industrial user.
, 2
Lead acetate paper is used to determine the presence of: - (ANSWER)hydrogen
sulfide.
What is the average detention time, in minutes, for a 40,000 gpd flow going
through a 1,500-gallon interceptor? - (ANSWER)54 minutes
The following type of flow measuring device can be installed in a pipe flowing full:
- (ANSWER)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. - (ANSWER)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? - (ANSWER)0.42 lb/day
What kind of container and preservative is required for samples to be analyzed
for oil and grease? - (ANSWER)Glass, Cool 4°C, H2SO4 to pH<2
A chain-of-custody form: - (ANSWER)is the ability to trace sample possession and
handling from collection through analysis.
, 3
The BOD determination is an empirical test in which standardized laboratory
procedures are used to: - (ANSWER)determine the relative oxygen requirements
of wastewaters, effluents, and polluted waters.
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
Alkalinity is reported as: - (ANSWER)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? -
(ANSWER)0.0025 N
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.
, 4
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
High pH wastewater is neutralized by adding: - (ANSWER)H2SO4.
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
