ONTARIO ON-SITE SEWAGE SYSTEMS TECHNICAL
EXAMINATION COMPLETE QUESTIONS AND
DETAILED SOLUTIONS LATEST UPDATE THIS YEAR
JUST RELEASED
Major Coverage Areas
1. General requirements and classification of sewage systems
2. Site evaluation, soil characteristics, and percolation time
3. Design sewage flows and hydraulic loading
4. Septic, treatment, and holding tanks
5. Class 1, Class 2, and Class 3 sewage systems
6. Class 4 sewage systems and leaching beds
7. Absorption trenches, fill systems, filter beds, and shallow buried systems
8. Clearances, grading, groundwater, and environmental protection
9. Construction, inspection, commissioning, and troubleshooting
10. Operation, maintenance, alteration, replacement, and regulatory compliance
1.
Which Ontario Building Code classification applies to a conventional
sewage system using a septic tank and subsurface leaching bed for
treatment and disposal?
A. Class 1
B. Class 2
C. Class 4
D. Class 5
Answer: C. Class 4
Rationale: A Class 4 sewage system is a leaching-bed system, including
conventional systems that treat sewage and discharge effluent into a
subsurface disposal area. ()
2.
,Which sewage system classification specifically describes a system
using a holding tank to retain hauled sewage before collection?
A. Class 1
B. Class 2
C. Class 4
D. Class 5
Answer: D. Class 5
Rationale: Class 5 systems use a holding tank for retention of hauled
sewage at the site where the sewage is produced before collection. ()
3.
Which type of sewage system classification includes a greywater
system under the Ontario Building Code?
A. Class 1
B. Class 2
C. Class 3
D. Class 4
Answer: B. Class 2
Rationale: The 2024 OBC identifies a greywater system as a Class 2
sewage system within the Part 8 classification framework. (
4.
A cesspool is being evaluated for classification under Part 8. Which
sewage system class correctly applies to this installation?
,A. Class 1
B. Class 2
C. Class 3
D. Class 5
Answer: C. Class 3
Rationale: Part 8 specifically identifies a cesspool as a Class 3 sewage
system, distinguishing it from leaching-bed and holding-tank systems. ()
5.
Which statement best describes the general scope of Part 8
concerning private on-site sewage systems in Ontario?
A. It addresses only septic tank manufacturing requirements.
B. It addresses only sewage disposal after construction.
C. It addresses design, construction, operation, and maintenance.
D. It applies exclusively to municipal sewage treatment plants.
Answer: C. It addresses design, construction, operation, and
maintenance.
Rationale: Part 8 establishes requirements covering the complete
lifecycle of sewage systems, including design, construction, operation,
and maintenance.)
6.
Why is the site evaluation an essential component before designing
an on-site sewage system?
, A. It determines the property's assessed value.
B. It identifies soil, groundwater, terrain, and site limitations.
C. It determines the building's electrical service size.
D. It establishes municipal property taxation.
Answer: B. It identifies soil, groundwater, terrain, and site limitations.
Rationale: Site evaluation establishes physical and environmental
conditions that determine whether a proposed sewage system can
function properly.
7.
When evaluating soil for a sewage disposal system, why are natural
in-situ soils particularly important?
A. They determine the property's landscaping requirements.
B. They provide the natural receiving medium for treated effluent.
C. They determine the building's foundation reinforcement.
D. They establish the septic tank's manufacturer.
Answer: B. They provide the natural receiving medium for treated
effluent.
Rationale: Natural soil characteristics strongly influence hydraulic
acceptance, treatment capability, groundwater protection, and
suitability of the disposal area.
8.
EXAMINATION COMPLETE QUESTIONS AND
DETAILED SOLUTIONS LATEST UPDATE THIS YEAR
JUST RELEASED
Major Coverage Areas
1. General requirements and classification of sewage systems
2. Site evaluation, soil characteristics, and percolation time
3. Design sewage flows and hydraulic loading
4. Septic, treatment, and holding tanks
5. Class 1, Class 2, and Class 3 sewage systems
6. Class 4 sewage systems and leaching beds
7. Absorption trenches, fill systems, filter beds, and shallow buried systems
8. Clearances, grading, groundwater, and environmental protection
9. Construction, inspection, commissioning, and troubleshooting
10. Operation, maintenance, alteration, replacement, and regulatory compliance
1.
Which Ontario Building Code classification applies to a conventional
sewage system using a septic tank and subsurface leaching bed for
treatment and disposal?
A. Class 1
B. Class 2
C. Class 4
D. Class 5
Answer: C. Class 4
Rationale: A Class 4 sewage system is a leaching-bed system, including
conventional systems that treat sewage and discharge effluent into a
subsurface disposal area. ()
2.
,Which sewage system classification specifically describes a system
using a holding tank to retain hauled sewage before collection?
A. Class 1
B. Class 2
C. Class 4
D. Class 5
Answer: D. Class 5
Rationale: Class 5 systems use a holding tank for retention of hauled
sewage at the site where the sewage is produced before collection. ()
3.
Which type of sewage system classification includes a greywater
system under the Ontario Building Code?
A. Class 1
B. Class 2
C. Class 3
D. Class 4
Answer: B. Class 2
Rationale: The 2024 OBC identifies a greywater system as a Class 2
sewage system within the Part 8 classification framework. (
4.
A cesspool is being evaluated for classification under Part 8. Which
sewage system class correctly applies to this installation?
,A. Class 1
B. Class 2
C. Class 3
D. Class 5
Answer: C. Class 3
Rationale: Part 8 specifically identifies a cesspool as a Class 3 sewage
system, distinguishing it from leaching-bed and holding-tank systems. ()
5.
Which statement best describes the general scope of Part 8
concerning private on-site sewage systems in Ontario?
A. It addresses only septic tank manufacturing requirements.
B. It addresses only sewage disposal after construction.
C. It addresses design, construction, operation, and maintenance.
D. It applies exclusively to municipal sewage treatment plants.
Answer: C. It addresses design, construction, operation, and
maintenance.
Rationale: Part 8 establishes requirements covering the complete
lifecycle of sewage systems, including design, construction, operation,
and maintenance.)
6.
Why is the site evaluation an essential component before designing
an on-site sewage system?
, A. It determines the property's assessed value.
B. It identifies soil, groundwater, terrain, and site limitations.
C. It determines the building's electrical service size.
D. It establishes municipal property taxation.
Answer: B. It identifies soil, groundwater, terrain, and site limitations.
Rationale: Site evaluation establishes physical and environmental
conditions that determine whether a proposed sewage system can
function properly.
7.
When evaluating soil for a sewage disposal system, why are natural
in-situ soils particularly important?
A. They determine the property's landscaping requirements.
B. They provide the natural receiving medium for treated effluent.
C. They determine the building's foundation reinforcement.
D. They establish the septic tank's manufacturer.
Answer: B. They provide the natural receiving medium for treated
effluent.
Rationale: Natural soil characteristics strongly influence hydraulic
acceptance, treatment capability, groundwater protection, and
suitability of the disposal area.
8.
