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CWEA Environmental Compliance Exam Questions and Answers
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CWEA Environmental Compliance Exam Questions and Answers
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CWEA Environmental Compliance Exam Questions and AnswersAn 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
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
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
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