Contractor Exam Questions And

CA D78 Portable Sanitation Contractor Exam Questions And Correct Answers (Verified Answers) Plus Rationale2026 Q&A| Instant Download Pdf

What is the primary purpose of a portable sanitation unit?

• Storage of cleaning supplies
• Provide temporary restroom facilities
• Wastewater treatment
• Pest control

Rationale: Portable sanitation units are designed to provide temporary

restroom facilities where permanent plumbing is unavailable.

• Which material is commonly used for the walls of portable toilets?
• Wood
• Metal
• High-density polyethylene (HDPE)
• Fiberglass

Rationale: HDPE is durable, lightweight, and resistant to chemicals,

making it the standard material for portable toilet construction.

• What is the recommended frequency for servicing high-traffic portable

toilets?

• Once a month
• Daily or every 2–3 days
• Weekly
• Every two weeks

Rationale: High-traffic sites require frequent servicing to maintain

hygiene and prevent overflow. 1 / 3

• What is a primary environmental concern with portable sanitation

units?

• Noise pollution
• Waste leakage or spillage
• Air pollution
• Soil erosion

Rationale: Improper handling can result in waste leakage,

contaminating soil and water sources.

• What is the minimum distance a portable toilet should be placed from a

food service area?

• 5 feet
• 10 feet
• 50 feet
• 100 feet

Rationale: Local regulations typically require portable toilets to be a

safe distance from food prep areas to prevent contamination.

• Which chemical is commonly used in portable toilet tanks to control

odor?

• Bleach
• Ammonia
• Quaternary ammonium compounds
• Vinegar

Rationale: Quaternary ammonium compounds are effective in

controlling odors and killing bacteria in holding tanks.

• How should wastewater from a portable toilet be disposed of?
• Into storm drains
• Into rivers or lakes
• At an approved sewage treatment facility
• Into a dry ditch

Rationale: Wastewater must be disposed of at approved facilities to

comply with health and environmental regulations.

• Which type of portable toilet is suitable for disabled access?
• Standard units
• ADA-compliant units
• Chemical-free units
• VIP restroom trailers 2 / 3

Rationale: ADA-compliant units are designed with wider doors,

ramps, and handrails to accommodate wheelchair users.

• What safety measure should workers take when cleaning portable

toilets?

• Wear casual clothing
• Use gloves, masks, and protective eyewear
• Only wash hands afterward
• Work without any protective gear

Rationale: Personal protective equipment prevents exposure to

harmful bacteria and chemicals.

• Which of the following is considered a “VIP restroom”?
• Standard portable toilet
• Luxury restroom trailer
• Chemical toilet
• Composting toilet

Rationale: VIP restrooms are luxury units with running water, sinks,

and climate control for special events.

• What is the typical holding tank capacity of a standard portable

toilet?

• 10–15 gallons
• 20–25 gallons
• 30–40 gallons
• 50–60 gallons

Rationale: Standard units usually have 30–40 gallon holding tanks

for temporary use before servicing is required.

• What is the recommended method for moving portable toilets on-

site?

• By hand for all units
• Using a dolly, forklift, or crane depending on size
• Dragging them
• By pushing without equipment

Rationale: Proper moving equipment prevents damage to units and

ensures worker safety.

• How often should toilet paper and hand sanitizer be replenished?
• Weekly
• Every servicing visit
• Monthly
• / 3