Page 1 of 115
Arizona (AZ) CR2 Excavating, Grading & Oil Surfacing
Practice EXAM QUESTIONS AND CORRECT DETAILED
SOLUTIONS WITH RATIONALES LATEST THIS YEAR (2026-
2027)
Randomized MCQs (Answers + Italics Rationales)
1. The Arizona CR2 license specifically authorizes the licensee to perform which type of work for
contracts
exceeding
1,000? 𝐴)𝑅𝑒𝑠𝑖𝑑𝑒𝑛𝑡𝑖𝑎𝑙𝑓𝑜𝑢𝑛𝑑𝑎𝑡𝑖𝑜𝑛𝑐𝑜𝑛𝑠𝑡𝑟𝑢𝑐𝑡𝑖𝑜𝑛𝐵)𝐸𝑙𝑒𝑐𝑡𝑟𝑖𝑐𝑎𝑙𝑐𝑜𝑛𝑑𝑢𝑖𝑡𝑖𝑛𝑠𝑡𝑎𝑙𝑙𝑎𝑡𝑖𝑜𝑛𝑢𝑛𝑑𝑒𝑟𝑠𝑙𝑎𝑏𝑠𝐶)𝐸𝑥𝑐𝑎𝑣𝑎𝑡𝑖𝑛
∗ 𝐴𝑛𝑠𝑤𝑒𝑟: 𝐶 ∗∗∗
𝑇ℎ𝑒𝐶𝑅2𝑐𝑙𝑎𝑠𝑠𝑖𝑓𝑖𝑐𝑎𝑡𝑖𝑜𝑛𝑖𝑠𝑑𝑒𝑓𝑖𝑛𝑒𝑑𝑏𝑦𝑡ℎ𝑒𝐴𝑟𝑖𝑧𝑜𝑛𝑎𝑅𝑒𝑔𝑖𝑠𝑡𝑟𝑎𝑟𝑜𝑓𝐶𝑜𝑛𝑡𝑟𝑎𝑐𝑡𝑜𝑟𝑠𝑠𝑝𝑒𝑐𝑖𝑓𝑖𝑐𝑎𝑙𝑙𝑦𝑓𝑜𝑟𝑒𝑥𝑐𝑎𝑣𝑎𝑡𝑖𝑜𝑛, 𝑔𝑟𝑎
1,000 or more.*
2. A supervisor is designated as the "competent person" on an excavation site according to
OSHA. What is their primary responsibility?
A) Operating the heaviest excavation equipment
B) Classifying soil types and taking prompt corrective action to eliminate hazards
C) Handling all site payroll and scheduling
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D) Ordering all necessary construction materials
Answer: B OSHA defines a competent person as someone capable of identifying existing and
predictable hazards who has the authority to take prompt corrective measures.
3. A trench is being dug that is 5 feet deep and 14 feet wide at the bottom. How does OSHA
classify this type of excavation?
A) A foundation excavation
B) A trench – deeper than it is wide with bottom width not exceeding 15 feet
C) A slope excavation
D) A utility vault excavation
Answer: B OSHA specifically defines a trench as a narrow underground excavation that is deeper
than it is wide, with a bottom width not exceeding 15 feet.
4. Which test is required to verify the integrity of a newly installed water main before it is
placed into service?
A) Air pressure test at 50 psi
B) Hydrostatic pressure test at twice the operating pressure
C) Sodium chloride solution test
D) Dye penetrant inspection
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Answer: B A hydrostatic pressure test confirms the pipe is leak-free and can withstand operating
pressures without failure.
5. OSHA requires protective systems such as sloping, benching, or shoring for trenches that
reach what depth or greater?
A) 3 feet
B) 4 feet
C) 5 feet
D) 6 feet
Answer: C *OSHA mandates protective systems for all excavations and trenches deeper than 5
feet to prevent cave-ins and protect workers.*
6. The correct procedure for disinfecting a newly installed potable water line involves which
step?
A) Flushing with hot water for 30 minutes
B) Adding chlorine at 50 mg/L and holding for a specified contact time
C) Running high-pressure air through the line
D) Backflushing with potable water
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Answer: B *Chlorination at 50 mg/L with adequate contact time kills bacteria and ensures the
water line is safe for potable use.*
7. A contractor is excavating near an existing building. What is the most critical factor to ensure
safety and prevent damage?
A) Using the largest available excavator for speed
B) The stability of adjacent structures and proper shoring
C) The color of the soil being excavated
D) Excavating only during dry weather
Answer: B Ensuring the stability of adjacent structures and using proper shoring is critical to
prevent collapse and structural damage.
8. The minimum cover depth for polyethylene (PE) gas service lines buried in residential areas
is:
A) 12 inches
B) 18 inches
C) 24 inches
D) 30 inches
Arizona (AZ) CR2 Excavating, Grading & Oil Surfacing
Practice EXAM QUESTIONS AND CORRECT DETAILED
SOLUTIONS WITH RATIONALES LATEST THIS YEAR (2026-
2027)
Randomized MCQs (Answers + Italics Rationales)
1. The Arizona CR2 license specifically authorizes the licensee to perform which type of work for
contracts
exceeding
1,000? 𝐴)𝑅𝑒𝑠𝑖𝑑𝑒𝑛𝑡𝑖𝑎𝑙𝑓𝑜𝑢𝑛𝑑𝑎𝑡𝑖𝑜𝑛𝑐𝑜𝑛𝑠𝑡𝑟𝑢𝑐𝑡𝑖𝑜𝑛𝐵)𝐸𝑙𝑒𝑐𝑡𝑟𝑖𝑐𝑎𝑙𝑐𝑜𝑛𝑑𝑢𝑖𝑡𝑖𝑛𝑠𝑡𝑎𝑙𝑙𝑎𝑡𝑖𝑜𝑛𝑢𝑛𝑑𝑒𝑟𝑠𝑙𝑎𝑏𝑠𝐶)𝐸𝑥𝑐𝑎𝑣𝑎𝑡𝑖𝑛
∗ 𝐴𝑛𝑠𝑤𝑒𝑟: 𝐶 ∗∗∗
𝑇ℎ𝑒𝐶𝑅2𝑐𝑙𝑎𝑠𝑠𝑖𝑓𝑖𝑐𝑎𝑡𝑖𝑜𝑛𝑖𝑠𝑑𝑒𝑓𝑖𝑛𝑒𝑑𝑏𝑦𝑡ℎ𝑒𝐴𝑟𝑖𝑧𝑜𝑛𝑎𝑅𝑒𝑔𝑖𝑠𝑡𝑟𝑎𝑟𝑜𝑓𝐶𝑜𝑛𝑡𝑟𝑎𝑐𝑡𝑜𝑟𝑠𝑠𝑝𝑒𝑐𝑖𝑓𝑖𝑐𝑎𝑙𝑙𝑦𝑓𝑜𝑟𝑒𝑥𝑐𝑎𝑣𝑎𝑡𝑖𝑜𝑛, 𝑔𝑟𝑎
1,000 or more.*
2. A supervisor is designated as the "competent person" on an excavation site according to
OSHA. What is their primary responsibility?
A) Operating the heaviest excavation equipment
B) Classifying soil types and taking prompt corrective action to eliminate hazards
C) Handling all site payroll and scheduling
, Page 2 of 115
D) Ordering all necessary construction materials
Answer: B OSHA defines a competent person as someone capable of identifying existing and
predictable hazards who has the authority to take prompt corrective measures.
3. A trench is being dug that is 5 feet deep and 14 feet wide at the bottom. How does OSHA
classify this type of excavation?
A) A foundation excavation
B) A trench – deeper than it is wide with bottom width not exceeding 15 feet
C) A slope excavation
D) A utility vault excavation
Answer: B OSHA specifically defines a trench as a narrow underground excavation that is deeper
than it is wide, with a bottom width not exceeding 15 feet.
4. Which test is required to verify the integrity of a newly installed water main before it is
placed into service?
A) Air pressure test at 50 psi
B) Hydrostatic pressure test at twice the operating pressure
C) Sodium chloride solution test
D) Dye penetrant inspection
, Page 3 of 115
Answer: B A hydrostatic pressure test confirms the pipe is leak-free and can withstand operating
pressures without failure.
5. OSHA requires protective systems such as sloping, benching, or shoring for trenches that
reach what depth or greater?
A) 3 feet
B) 4 feet
C) 5 feet
D) 6 feet
Answer: C *OSHA mandates protective systems for all excavations and trenches deeper than 5
feet to prevent cave-ins and protect workers.*
6. The correct procedure for disinfecting a newly installed potable water line involves which
step?
A) Flushing with hot water for 30 minutes
B) Adding chlorine at 50 mg/L and holding for a specified contact time
C) Running high-pressure air through the line
D) Backflushing with potable water
, Page 4 of 115
Answer: B *Chlorination at 50 mg/L with adequate contact time kills bacteria and ensures the
water line is safe for potable use.*
7. A contractor is excavating near an existing building. What is the most critical factor to ensure
safety and prevent damage?
A) Using the largest available excavator for speed
B) The stability of adjacent structures and proper shoring
C) The color of the soil being excavated
D) Excavating only during dry weather
Answer: B Ensuring the stability of adjacent structures and using proper shoring is critical to
prevent collapse and structural damage.
8. The minimum cover depth for polyethylene (PE) gas service lines buried in residential areas
is:
A) 12 inches
B) 18 inches
C) 24 inches
D) 30 inches
