Page 1 of 146
(AL) Alabama Sewer Projects Contractor Exam
QUESTIONS AND VERIFIED ANSWERS WITH
RATIONALES JUST RELEASED
(AL) Alabama Sewer Projects Contractor Exam Practice Questions
10 MOST-TESTED EXAM COVERAGE AREAS
1. Sewer Pipe Installation and Layout — sewer pipe materials, pipe joints, bedding, alignment,
grade, trench preparation, pipe laying, connections, manholes, cleanouts, and proper
installation practices.
2. Sewer Flow, Slope, and Drainage — gravity flow, minimum slope concepts, invert elevations,
pipe grade, drainage patterns, flow direction, hydraulic performance, and preventing standing
water.
3. Sewer Testing, Inspection, and Connections — leakage testing, pressure testing, inspection,
infiltration, exfiltration, service connections, manholes, cleanouts, and correction of installation
defects.
4. Septic Tanks and Components — septic tank function, sizing concepts, inlet and outlet
arrangements, baffles, access covers, sludge and scum, distribution systems, and maintenance.
5. Drain Fields and Onsite Sewage Systems — soil conditions, absorption areas, trench layout,
distribution, setbacks, site evaluation, drainage, system protection, and proper operation.
6. Excavation and Trenching — trench layout, excavation equipment, trench depth, spoil
placement, trench boxes, sloping, benching, shoring, access, groundwater, and soil conditions.
7. Grading, Bedding, Backfill, and Compaction — elevations, grade control, bedding materials,
haunching, initial backfill, final backfill, compaction, settlement prevention, and surface
restoration.
8. Stormwater and Site Drainage — runoff, erosion, drainage structures, temporary controls,
sediment control, swales, ditches, culverts, inlet protection, and site drainage during
construction.
9. Construction Safety and OSHA — trench safety, competent-person duties, protective systems,
ladders, falling hazards, equipment operation, confined spaces, utilities, PPE, and emergency
procedures.
10. Alabama Requirements and Contractor Practices — Alabama contractor requirements, sewer-
project classification, onsite sewage requirements, Alabama One Call concepts, permits, plans,
inspections, documentation, and responsible construction practices. The Alabama Board
identifies Sewer Projects as a specialty under Municipal and Utility construction. (PSI Online)
1.
, Page 2 of 146
During installation of a gravity sewer, why should the contractor carefully maintain the designed pipe
grade throughout the entire trench length?
A. To increase pipe color
B. To maintain proper wastewater flow
C. To reduce pipe diameter
D. To eliminate all manholes
Answer: B
Rationale: Correct pipe grade helps wastewater flow by gravity and reduces areas where solids or water
can collect.
2.
Before workers enter a newly excavated sewer trench, what should the competent person do first to
protect workers from excavation hazards?
A. Start laying pipe
B. Inspect the excavation and protective system
C. Remove all warning signs
D. Add water to the trench
, Page 3 of 146
Answer: B
Rationale: OSHA excavation rules require inspection of excavations and protective systems by a
competent person.
3.
When installing a gravity sewer pipe, what is the main purpose of properly prepared bedding beneath
the pipe?
A. To increase pipe weight
B. To support the pipe evenly
C. To reduce pipe length
D. To prevent all groundwater
Answer: B
Rationale: Proper bedding provides uniform support and helps maintain pipe alignment and grade.
4.
A contractor finds standing water inside a newly installed gravity sewer after construction is completed.
What problem should be checked first?
, Page 4 of 146
A. Pipe color
B. Incorrect grade or settlement
C. Manhole paint
D. Trench warning signs
Answer: B
Rationale: Standing water commonly indicates incorrect grade, poor bedding, settlement, or another
installation problem.
5.
Why should a sewer contractor establish control points and elevations before beginning pipe installation
on a project?
A. To select employee uniforms
B. To control alignment and pipe grade
C. To determine pipe color
D. To eliminate excavation
Answer: B
(AL) Alabama Sewer Projects Contractor Exam
QUESTIONS AND VERIFIED ANSWERS WITH
RATIONALES JUST RELEASED
(AL) Alabama Sewer Projects Contractor Exam Practice Questions
10 MOST-TESTED EXAM COVERAGE AREAS
1. Sewer Pipe Installation and Layout — sewer pipe materials, pipe joints, bedding, alignment,
grade, trench preparation, pipe laying, connections, manholes, cleanouts, and proper
installation practices.
2. Sewer Flow, Slope, and Drainage — gravity flow, minimum slope concepts, invert elevations,
pipe grade, drainage patterns, flow direction, hydraulic performance, and preventing standing
water.
3. Sewer Testing, Inspection, and Connections — leakage testing, pressure testing, inspection,
infiltration, exfiltration, service connections, manholes, cleanouts, and correction of installation
defects.
4. Septic Tanks and Components — septic tank function, sizing concepts, inlet and outlet
arrangements, baffles, access covers, sludge and scum, distribution systems, and maintenance.
5. Drain Fields and Onsite Sewage Systems — soil conditions, absorption areas, trench layout,
distribution, setbacks, site evaluation, drainage, system protection, and proper operation.
6. Excavation and Trenching — trench layout, excavation equipment, trench depth, spoil
placement, trench boxes, sloping, benching, shoring, access, groundwater, and soil conditions.
7. Grading, Bedding, Backfill, and Compaction — elevations, grade control, bedding materials,
haunching, initial backfill, final backfill, compaction, settlement prevention, and surface
restoration.
8. Stormwater and Site Drainage — runoff, erosion, drainage structures, temporary controls,
sediment control, swales, ditches, culverts, inlet protection, and site drainage during
construction.
9. Construction Safety and OSHA — trench safety, competent-person duties, protective systems,
ladders, falling hazards, equipment operation, confined spaces, utilities, PPE, and emergency
procedures.
10. Alabama Requirements and Contractor Practices — Alabama contractor requirements, sewer-
project classification, onsite sewage requirements, Alabama One Call concepts, permits, plans,
inspections, documentation, and responsible construction practices. The Alabama Board
identifies Sewer Projects as a specialty under Municipal and Utility construction. (PSI Online)
1.
, Page 2 of 146
During installation of a gravity sewer, why should the contractor carefully maintain the designed pipe
grade throughout the entire trench length?
A. To increase pipe color
B. To maintain proper wastewater flow
C. To reduce pipe diameter
D. To eliminate all manholes
Answer: B
Rationale: Correct pipe grade helps wastewater flow by gravity and reduces areas where solids or water
can collect.
2.
Before workers enter a newly excavated sewer trench, what should the competent person do first to
protect workers from excavation hazards?
A. Start laying pipe
B. Inspect the excavation and protective system
C. Remove all warning signs
D. Add water to the trench
, Page 3 of 146
Answer: B
Rationale: OSHA excavation rules require inspection of excavations and protective systems by a
competent person.
3.
When installing a gravity sewer pipe, what is the main purpose of properly prepared bedding beneath
the pipe?
A. To increase pipe weight
B. To support the pipe evenly
C. To reduce pipe length
D. To prevent all groundwater
Answer: B
Rationale: Proper bedding provides uniform support and helps maintain pipe alignment and grade.
4.
A contractor finds standing water inside a newly installed gravity sewer after construction is completed.
What problem should be checked first?
, Page 4 of 146
A. Pipe color
B. Incorrect grade or settlement
C. Manhole paint
D. Trench warning signs
Answer: B
Rationale: Standing water commonly indicates incorrect grade, poor bedding, settlement, or another
installation problem.
5.
Why should a sewer contractor establish control points and elevations before beginning pipe installation
on a project?
A. To select employee uniforms
B. To control alignment and pipe grade
C. To determine pipe color
D. To eliminate excavation
Answer: B
