AZ L-90 Artificial Turf Installation Contractor
Exam Questions and Correct Answers (Verified
Answers) Plus Rationale 2027 Q&A| Instant
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1. What is the primary purpose of properly preparing the subgrade
before installing artificial turf?
a. To increase turf color
b. To reduce the amount of infill required
c. To provide a stable, level, and well-drained foundation
d. To eliminate the need for edging
Rationale: A properly prepared subgrade provides structural support
for the turf system and helps prevent settlement, uneven surfaces,
ponding, and premature failure. Drainage and stability are
fundamental to a durable artificial turf installation.
, 2. Which material is commonly used as a compacted aggregate base
beneath artificial turf?
a. Topsoil
b. Organic mulch
c. Crushed aggregate or decomposed granite
d. Peat moss
Rationale: Crushed aggregate and similar granular materials can be
graded and compacted to create a stable base while allowing water
to move through the system. Organic materials such as mulch and
peat are unsuitable because they can decompose and settle.
3. Before excavation begins, what should a contractor do regarding
underground utilities?
a. Assume utilities are deeper than the excavation
b. Begin excavation and locate utilities if encountered
c. Have underground utilities properly located and marked
d. Remove all utility markings from the work area
Rationale: Utility locating is a critical safety measure before
excavation. Contacting an underground electrical, gas, water, or
communication line can cause serious injury, service interruptions,
property damage, and liability.
, 4. What is the main reason for compacting the aggregate base?
a. To make the turf softer
b. To change the turf color
c. To minimize future settlement and provide structural stability
d. To prevent the turf backing from draining
Rationale: Compaction reduces voids within the aggregate and
increases the strength and stability of the base. An inadequately
compacted base can later settle, producing depressions and an
uneven finished surface.
5. What type of drainage condition is generally desirable beneath
artificial turf?
a. Completely impermeable construction
b. Drainage only at the perimeter
c. Positive drainage through or beneath the turf system
d. Water retention beneath the aggregate
Rationale: Artificial turf systems need to move water away from the
surface efficiently. Proper drainage reduces standing water, soil
saturation, odors, and damage caused by repeated wetting and
drying.
, 6. What is the purpose of establishing the finished grade before
laying artificial turf?
a. To determine the turf color
b. To eliminate the need for seams
c. To establish the intended elevations and drainage slopes
d. To determine the manufacturer's warranty
Rationale: Finished grading controls both the appearance and
performance of the installation. Proper elevations ensure that water
flows toward designated drainage areas rather than collecting on the
turf.
7. Which condition can result from inadequate subgrade
compaction?
a. Improved drainage
b. Increased turf durability
c. Settlement and depressions
d. Reduced material movement
Rationale: Poorly compacted soil or aggregate can compress after
installation, particularly under repeated traffic or moisture changes.
This may create low spots that affect drainage and appearance.
Exam Questions and Correct Answers (Verified
Answers) Plus Rationale 2027 Q&A| Instant
Download Pdf
1. What is the primary purpose of properly preparing the subgrade
before installing artificial turf?
a. To increase turf color
b. To reduce the amount of infill required
c. To provide a stable, level, and well-drained foundation
d. To eliminate the need for edging
Rationale: A properly prepared subgrade provides structural support
for the turf system and helps prevent settlement, uneven surfaces,
ponding, and premature failure. Drainage and stability are
fundamental to a durable artificial turf installation.
, 2. Which material is commonly used as a compacted aggregate base
beneath artificial turf?
a. Topsoil
b. Organic mulch
c. Crushed aggregate or decomposed granite
d. Peat moss
Rationale: Crushed aggregate and similar granular materials can be
graded and compacted to create a stable base while allowing water
to move through the system. Organic materials such as mulch and
peat are unsuitable because they can decompose and settle.
3. Before excavation begins, what should a contractor do regarding
underground utilities?
a. Assume utilities are deeper than the excavation
b. Begin excavation and locate utilities if encountered
c. Have underground utilities properly located and marked
d. Remove all utility markings from the work area
Rationale: Utility locating is a critical safety measure before
excavation. Contacting an underground electrical, gas, water, or
communication line can cause serious injury, service interruptions,
property damage, and liability.
, 4. What is the main reason for compacting the aggregate base?
a. To make the turf softer
b. To change the turf color
c. To minimize future settlement and provide structural stability
d. To prevent the turf backing from draining
Rationale: Compaction reduces voids within the aggregate and
increases the strength and stability of the base. An inadequately
compacted base can later settle, producing depressions and an
uneven finished surface.
5. What type of drainage condition is generally desirable beneath
artificial turf?
a. Completely impermeable construction
b. Drainage only at the perimeter
c. Positive drainage through or beneath the turf system
d. Water retention beneath the aggregate
Rationale: Artificial turf systems need to move water away from the
surface efficiently. Proper drainage reduces standing water, soil
saturation, odors, and damage caused by repeated wetting and
drying.
, 6. What is the purpose of establishing the finished grade before
laying artificial turf?
a. To determine the turf color
b. To eliminate the need for seams
c. To establish the intended elevations and drainage slopes
d. To determine the manufacturer's warranty
Rationale: Finished grading controls both the appearance and
performance of the installation. Proper elevations ensure that water
flows toward designated drainage areas rather than collecting on the
turf.
7. Which condition can result from inadequate subgrade
compaction?
a. Improved drainage
b. Increased turf durability
c. Settlement and depressions
d. Reduced material movement
Rationale: Poorly compacted soil or aggregate can compress after
installation, particularly under repeated traffic or moisture changes.
This may create low spots that affect drainage and appearance.
