Free Association of Boards of Certification Technical Proficiency and Best Practices Questions and Answers 1 — Questions and Answers
Question 1: After a new water main is installed and pressure tested it should be...
- Flushed with clean water for 24 hours and put into service
- Filled with a solution of 25 ppm to 50 ppm free chlorine for at least 24 hours prior to flushing (Correct answer)
- Filled with clean water and allowed to sit for 5 days at full pressure before turning the water into the system
- Photographed so that mapping can be avoided until the system is complete
Correct answer: Filled with a solution of 25 ppm to 50 ppm free chlorine for at least 24 hours prior to flushing
After installation and pressure testing, new water mains must be disinfected to eliminate any harmful microorganisms. Filling the main with a chlorine solution at a concentration of 25 to 50 parts per million (ppm) allows for effective disinfection. The recommended duration of at least 24 hours ensures that the chlorine has sufficient time to contact and kill bacteria before the system is flushed and returned to service.
Question 2: Calculate the volume, in gallons, of a tank that is 75 feet long, 20 feet wide, and 10 feet deep.
- 15,000 gallons
- 150,000 gallons
- 112,200 gallons (Correct answer)
- 224,400 gallons
Correct answer: 112,200 gallons
75 ft x 20 ft x 10 ft = 15,000 cu ft <br> 15,000 cu ft x 7.48 gal/cu ft = 112,200 gal
Question 3: An empty atmospheric storage tank is 8 feet in diameter and 32 feet high. How long will it take to fill 90% of the tank volume if a pump is discharging a constant 24 gallons per minute into the tank?
- 7 hours 31 minutes (Correct answer)
- 8 hours 21 minutes
- 8 hours 23 minutes
- 9 hours 17 minutes
Correct answer: 7 hours 31 minutes
8 feet x 8 feet x 32 feet x .785 = 1,607.68 cu ft <br> 1607.68 cu ft x 7.48 gallons per cu ft = 12,025 gallons<br> 12,025 gallons x 0.90 = 10,823 gallons<br> 10,823 gallons / 24 gpm = 451 minutes<br> 451 minutes = 7 hours 31 minutes
Question 4: What are the two most important safety concerns when entering a confined space?
- Corrosive chemicals and falls
- Bad odors and claustrophobia
- Extreme air temperatures and slippery surfaces
- Oxygen deficiency and hazardous gases (Correct answer)
Correct answer: Oxygen deficiency and hazardous gases
When entering confined spaces, the most critical safety concerns are the levels of oxygen and the presence of hazardous gases. Oxygen deficiency can lead to asphyxiation, while hazardous gases (such as carbon monoxide, hydrogen sulfide, or methane) can be toxic or explosive. Proper safety protocols, including air monitoring and ventilation, are essential to protect workers in these environments.
Question 5: Under the requirements of the Safe Drinking Water Act, it is the duty of the water purveyor to deliver potable water of proper quantity only as far as the...
- Entry point of the distribution system
- Customer's curb box and service connection
- Consumer's tap inside the home (Correct answer)
- Furthest water main blow-off or sampling point
Correct answer: Consumer's tap inside the home
The Safe Drinking Water Act mandates that water purveyors are responsible for providing safe drinking water up to the point of delivery, which is the consumer's tap. This means that once the water reaches the consumer's premises, the responsibility for maintaining water quality and safety within the plumbing system falls to the homeowner. It emphasizes the importance of ensuring that the water supply is safe and meets regulatory standards at the point of delivery.
Free Association of Boards of Certification Technical Proficiency and Best Practices Questions and Answers 1
After a new water main is installed and pressure tested it should be...