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CWEA Environmental Compliance Exam
Questions With Verified Answers.
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.
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
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A chain-of-custody form: - answer✔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: -
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.
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
What are the types of stormwater pollution? - answer✔Sediment,BOD,Nutrients
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How often must 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.
Low pH wstewater is neutralized by adding: - answer✔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? - answer✔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? - answer✔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? - answer✔10
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
The State NPDES General Permit for storm water from Industrial Activities covers industries subject to
federal storm water effluent limitation guidelines under 40 CFR, Subchapter N. Which of the following
industries falls under this category? - answer✔Cattle feedlot
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
An industry has five sewer connections with the following discharge rates: 1) 300 gpd, 2) 75 gpd, 3) 725
gpd, 4)1,200gpd, 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
An industry has a 36,000-gpd discharge in a sixteen-hour day. A composite sample of 2 liters is needed.
The sampler is set to take 125 ml. Each time the pump is activated. For a flow proportional sample, at
what gallon interval should the sampler activate to take a sample? - answer✔2,250 gallons
