NEW MEXICO (NM) GF-9 UTILITY LINES PRACTICE EXAM QUESTIONS AND ANSWERS ALREADY GRADED
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CORE DOMAINS
New Mexico Contractor Licensing Law and Regulations (NMSA 60-13)
Earthwork, Excavation, Trenching, and Compaction
Gravity and Pressure Water Distribution Systems
Sanitary Sewer and Storm Drainage System Construction
Pipe Materials, Jointing, and Bedding Specifications
Trench Safety, Shoring, and OSHA Standards
Traffic Control and Work Zone Safety (MUTCD)
Pavement Restoration and Asphalt Patching
New Mexico Environment Department (NMED) and Utility Notification (811)
Business Management, Estimating, and Project Administration
This practice assessment is designed for candidates preparing for the New Mexico GF-9 Utility Lines Contractor
Licensing Examination. The examination evaluates the technical competencies required to construct, install, and
repair underground utility systems, including water mains, sanitary sewers, and storm drains, in compliance with
,New Mexico state regulations, local municipal standards, and OSHA safety requirements. Key skills assessed
include interpreting construction plans and profiles, installing and testing water and sewer lines, performing
compaction and trench safety, restoring pavement and surfaces, managing traffic control, and administering
business operations. Questions simulate realistic field and office scenarios to test critical thinking, code application,
and professional judgment. The format consists of 100 original multiple-choice questions that mirror the cognitive
demands, style, and difficulty distribution of the live proctored examination.
SECTION ONE
Question 1
According to New Mexico law, a GF-9 Utility Lines contractor is licensed to install:
A. Only residential plumbing fixtures
B. Water mains, sanitary sewers, storm drains, and related underground utility lines
C. Electrical transmission lines only
D. Building foundations only
🟢 Correct Answer: B
🔴 RATIONALE: The GF-9 classification specifically covers the installation of underground utility lines, including
water, sewer, and storm systems, but does not include building plumbing or electrical work.
,Question 2
In New Mexico, the "One-Call" notification (811) must be made at least how many working days before starting
excavation?
A. 1 working day
B. 2 working days
C. 5 working days
D. 10 working days
🟢 Correct Answer: B
🔴 RATIONALE: The New Mexico One-Call law requires a 2-working-day notice (48 hours, excluding weekends
and holidays) to allow utility owners time to locate and mark their lines.
Question 3
What is the minimum slope for a 4-inch diameter sanitary sewer lateral pipe per standard plumbing and sewer
codes?
A. 1/16 inch per foot
B. 1/8 inch per foot
C. 1/4 inch per foot
D. 1/2 inch per foot
, 🟢 Correct Answer: C
🔴 RATIONALE: To achieve a self-scouring velocity of 2 feet per second, smaller-diameter pipes require a
steeper slope. 4-inch and 6-inch laterals require a minimum of 1/4 inch per foot.
Question 4
A contractor is installing a PVC water main. The pipe material is C900 PVC. What type of joint is typically used
for this pressure pipe?
A. Solvent-cemented joint
B. Bell and spigot with an elastomeric gasket
C. Welded joint
D. Threaded joint
🟢 Correct Answer: B
🔴 RATIONALE: C900 PVC pressure pipe uses an integral bell and a rubber gasket (push-on joint) designed to
provide a watertight, flexible seal.
Question 5
According to OSHA regulations, an excavation 7 feet deep in Type C soil requires what protective system?
A+. 100% Verified Solutions | Updated Per Latest Guidelines | Graded A+...
CORE DOMAINS
New Mexico Contractor Licensing Law and Regulations (NMSA 60-13)
Earthwork, Excavation, Trenching, and Compaction
Gravity and Pressure Water Distribution Systems
Sanitary Sewer and Storm Drainage System Construction
Pipe Materials, Jointing, and Bedding Specifications
Trench Safety, Shoring, and OSHA Standards
Traffic Control and Work Zone Safety (MUTCD)
Pavement Restoration and Asphalt Patching
New Mexico Environment Department (NMED) and Utility Notification (811)
Business Management, Estimating, and Project Administration
This practice assessment is designed for candidates preparing for the New Mexico GF-9 Utility Lines Contractor
Licensing Examination. The examination evaluates the technical competencies required to construct, install, and
repair underground utility systems, including water mains, sanitary sewers, and storm drains, in compliance with
,New Mexico state regulations, local municipal standards, and OSHA safety requirements. Key skills assessed
include interpreting construction plans and profiles, installing and testing water and sewer lines, performing
compaction and trench safety, restoring pavement and surfaces, managing traffic control, and administering
business operations. Questions simulate realistic field and office scenarios to test critical thinking, code application,
and professional judgment. The format consists of 100 original multiple-choice questions that mirror the cognitive
demands, style, and difficulty distribution of the live proctored examination.
SECTION ONE
Question 1
According to New Mexico law, a GF-9 Utility Lines contractor is licensed to install:
A. Only residential plumbing fixtures
B. Water mains, sanitary sewers, storm drains, and related underground utility lines
C. Electrical transmission lines only
D. Building foundations only
🟢 Correct Answer: B
🔴 RATIONALE: The GF-9 classification specifically covers the installation of underground utility lines, including
water, sewer, and storm systems, but does not include building plumbing or electrical work.
,Question 2
In New Mexico, the "One-Call" notification (811) must be made at least how many working days before starting
excavation?
A. 1 working day
B. 2 working days
C. 5 working days
D. 10 working days
🟢 Correct Answer: B
🔴 RATIONALE: The New Mexico One-Call law requires a 2-working-day notice (48 hours, excluding weekends
and holidays) to allow utility owners time to locate and mark their lines.
Question 3
What is the minimum slope for a 4-inch diameter sanitary sewer lateral pipe per standard plumbing and sewer
codes?
A. 1/16 inch per foot
B. 1/8 inch per foot
C. 1/4 inch per foot
D. 1/2 inch per foot
, 🟢 Correct Answer: C
🔴 RATIONALE: To achieve a self-scouring velocity of 2 feet per second, smaller-diameter pipes require a
steeper slope. 4-inch and 6-inch laterals require a minimum of 1/4 inch per foot.
Question 4
A contractor is installing a PVC water main. The pipe material is C900 PVC. What type of joint is typically used
for this pressure pipe?
A. Solvent-cemented joint
B. Bell and spigot with an elastomeric gasket
C. Welded joint
D. Threaded joint
🟢 Correct Answer: B
🔴 RATIONALE: C900 PVC pressure pipe uses an integral bell and a rubber gasket (push-on joint) designed to
provide a watertight, flexible seal.
Question 5
According to OSHA regulations, an excavation 7 feet deep in Type C soil requires what protective system?
