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CWEA Environmental Compliance Test Questions & 100% Correct Answers
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CWEA Environmental ComplianceTest Questions & 100% Correct
Answers
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? - ✔✔100 times higher
High pH wastewater is neutralized by adding: - ✔✔H2SO4.
When working in the street, signs and cones are needed when: - ✔✔over half of the street is blocked.
What is the danger of asphyxiation set point for oxygen on an atmospheric monitor? - ✔✔19.5
percent
A common technology to recover chemicals from rinse water include: - ✔✔ion exchange.
Is an essential part of any sampling quality control methodology: - ✔✔Proper cleaning techniques
for sampling equipment
What are the types of stormwater pollution? - ✔✔Sediment,BOD,Nutrients
How often must SIUs be inspected? - ✔✔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? -
✔✔399 grams per liter
,Sodium hydroxide is commonly referred to as: - ✔✔caustic soda.
Which of the following does an ultrafiltration system remove from wastewater? -
✔✔suspended solids.
Low pH wstewater is neutralized by adding: - ✔✔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? - ✔✔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? - ✔✔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? - ✔✔10
A POTW must retain Industrial User records for a minimum of: - ✔✔3 years
The Federal Act that introduced the concept of cradle to grave manifesting for hazardous
waste products is: - ✔✔Resource Conservation and Recovery Act (RCRA).
Waste discharge regulations can be concentration- or mass-based except for: - ✔✔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: - ✔✔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? - ✔✔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? - ✔✔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? - ✔✔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? - ✔✔2,250 gallons
Lead acetate paper is used to determine the presence of: - ✔✔hydrogen sulfide.
In a normally distributed population of sampling data, what percent of the data points will fall within
one standard deviation? - ✔✔68.3
What kind of container and preservative is required for samples to be analyzed for oil and grease? -
✔✔Glass, Cool 4°C, H2SO4 to pH < 2
In open channel flow measurement, the term "primary element" is used to denote the:
- ✔✔measuring structure that contains the water.
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 solution? -
✔✔399
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 the downstream manhole? -
✔✔Pipe length, invert elevation at both ends, water depth at downstream end, and pipe roughness
coefficient.
Why are septum vials used for TTO samples? - ✔✔To prevent sample contact with air
, The scouring velocity in a sewer is the speed of wastewater that will: - ✔✔Prevent the deposition
and buildup of solids.
22. Flatter sewer line grades may cause added sewer maintenance expense and odor nuisance. The
problem is most likely cased by: - ✔✔A decrease in velocity allowing organic and inorganic solids
to settle out
A cyanide-bearing waste is to be treated by a batch process using the alkaline chlorination method.
The cyanide holding tank contains 6,000 gallons with a cyanide concentration of 15 mg/L. Seven
pounds of caustic soda and eight pounds of chlorine are required to oxidize one pound of cyanide to
nitrogen gas. How many pounds of chlorine are needed? - ✔✔6.0
What types of control devices are used to stop and start pumps? - ✔✔Floats
What type of pump is used in lift station wet wells? - ✔✔Submersible
What is the main purpose of gate valves in a lift station? - ✔✔To isolate the lift station from
the wastewater collection system during maintenance
Which of the following is not a suspended growth biological treatment system? - ✔✔Trickling filter
Activated sludge is wasted from the reactor to: - ✔✔control the sludge age.
A method commonly used to thicken activated sludge prior to treatment is: - ✔✔dissolved
air flotation.
A metal finishing facility generates nickel-plating sludge from the clarifier of its pretreatment system.
The clarifier sludge is 6,000 mg/L and 2 percent of the treatment plant inflow of 50,000 gallons per day.
The sludge is dewatered in a filter press, 5 days per week, and shipped off site for disposal as hazardous
waste once per week. If the filter press cake is 25 percent solids, how many pounds of dewatered
sludge should be manifested as hazardous waste each week, assuming a cake density of 8.34 lbs/gallon?
- ✔✔1,000
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