CWEA ENVIRONMENTAL COMPLIANCE
INSPECTOR EXAMINATION TEST
COMPLETE STUDY GUIDE WITH SOLVED Q
AND A 2026
◉ What is the average detention time, in minutes, for a 40,000 gpd
flow going through a 1500 gallon interceptor.
Answer: 54 minutes
◉ What 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 that 100% containment of all tank capacity is needed.
Answer:
◉ tank 1: 6ft wide, 6ft long 6ft high
Answer:
◉ tank 2: 4ft wide, 20 ft long, 3 ft high
Answer:
,◉ tank 3: 8ft in diameter, and 9ft high.
Answer: 305,992 gallons
◉ 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
◉ 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
◉ What is the normality of a sodium hydroxide solution of 25 ml if a
.01 N sulfuric acid solution neutrilizes 100 ml of the NaOH solution?
Answer: .0025 N
◉ The hardness determination measures?
Answer: calcium and magnesium
◉ Sodium Hydroxide is commonly referred to as:
Answer: Caustic soda
, ◉ an industry has a wastewater discharge of 10000 gallons per day
containing 5 mg/L of copper. What is the industry's mass emission
rate of copper in pounds per day?
Answer: .42 lb/day
◉ An industry has five sewer connections with the following
discharges:
Answer:
◉ 300gpd, 75gpd, 725gpd, 1200gpd, 200gpd
Answer:
◉ A flow weighted composite sample of 5 liters is desired. How
much milliliters of sample from each connection should be
composited?
Answer: 600, 150, 1450, 2400, 400
◉ You have been directed to collect a 12 gour flow proportional
sample. Using the following data, select the volume of sample to be
collected at 12:00 pm if a total sample volume of one liter is
required.
Answer:
◉ 6am
INSPECTOR EXAMINATION TEST
COMPLETE STUDY GUIDE WITH SOLVED Q
AND A 2026
◉ What is the average detention time, in minutes, for a 40,000 gpd
flow going through a 1500 gallon interceptor.
Answer: 54 minutes
◉ What 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 that 100% containment of all tank capacity is needed.
Answer:
◉ tank 1: 6ft wide, 6ft long 6ft high
Answer:
◉ tank 2: 4ft wide, 20 ft long, 3 ft high
Answer:
,◉ tank 3: 8ft in diameter, and 9ft high.
Answer: 305,992 gallons
◉ 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
◉ 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
◉ What is the normality of a sodium hydroxide solution of 25 ml if a
.01 N sulfuric acid solution neutrilizes 100 ml of the NaOH solution?
Answer: .0025 N
◉ The hardness determination measures?
Answer: calcium and magnesium
◉ Sodium Hydroxide is commonly referred to as:
Answer: Caustic soda
, ◉ an industry has a wastewater discharge of 10000 gallons per day
containing 5 mg/L of copper. What is the industry's mass emission
rate of copper in pounds per day?
Answer: .42 lb/day
◉ An industry has five sewer connections with the following
discharges:
Answer:
◉ 300gpd, 75gpd, 725gpd, 1200gpd, 200gpd
Answer:
◉ A flow weighted composite sample of 5 liters is desired. How
much milliliters of sample from each connection should be
composited?
Answer: 600, 150, 1450, 2400, 400
◉ You have been directed to collect a 12 gour flow proportional
sample. Using the following data, select the volume of sample to be
collected at 12:00 pm if a total sample volume of one liter is
required.
Answer:
◉ 6am
