ONTARIO OIT PRACTICE EXAMINATION 2026 QUESTIONS
WITH ANSWERS GRADED A+
● Appendix 1. Answer: Risk determination worksheet
● Appendix 2.1. Answer: Post-construction water balance performance standard
● Appendix 2. Answer: Post-construction water balance performance standard
spPost-construction water balance performance standard spreadsheetreadsheet
● Appendix 3. Answer: Bioassesment Monitoring guidlines
● Appendix 4. Answer: Adopted/implemented Sediment TMDLs
● Appendix 5. Answer: Glossary
● Appendix 6. Answer: Acronyms
● Appendix 7. Answer: State and Regional Water Resources Control Board Contacts
● Rainfall erosivity waiver. Answer: The option of allowing a small construction site (>1 and
<5 acres) to self-certify if the rainfall erosivity value (R value) for their site's given location and
time frame compute to be less than or equal to 5.
● ATS (Active Treatment Systems). Answer: There are instances on construction sites
where traditional erosion and sediment controls do not effectively control accelerated erosion.
Under such circumstances, or under circumstances where storm water discharges leaving the
site may cause or contribute to an exceedance of a water quality standard, the use of an
Active Treatment System (ATS) may be necessary. Additionally, it may be appropriate to use
an ATS when site constraints inhibit the ability to construct a correctly sized sediment basin,
when clay and/or highly erosive soils are present, or when the site has very steep or long
slope lengths.
● What are the NALs for Risk 2 and 3. Answer: pH <6.5 and >8.5
● Receiving Water Monitoring Triggers. Answer: For Risk level 3
● What is a Qualifying Event?. Answer: 1/2" or more of discharges over a period of time in
which there is no break in rain > 48 hrs
WITH ANSWERS GRADED A+
● Appendix 1. Answer: Risk determination worksheet
● Appendix 2.1. Answer: Post-construction water balance performance standard
● Appendix 2. Answer: Post-construction water balance performance standard
spPost-construction water balance performance standard spreadsheetreadsheet
● Appendix 3. Answer: Bioassesment Monitoring guidlines
● Appendix 4. Answer: Adopted/implemented Sediment TMDLs
● Appendix 5. Answer: Glossary
● Appendix 6. Answer: Acronyms
● Appendix 7. Answer: State and Regional Water Resources Control Board Contacts
● Rainfall erosivity waiver. Answer: The option of allowing a small construction site (>1 and
<5 acres) to self-certify if the rainfall erosivity value (R value) for their site's given location and
time frame compute to be less than or equal to 5.
● ATS (Active Treatment Systems). Answer: There are instances on construction sites
where traditional erosion and sediment controls do not effectively control accelerated erosion.
Under such circumstances, or under circumstances where storm water discharges leaving the
site may cause or contribute to an exceedance of a water quality standard, the use of an
Active Treatment System (ATS) may be necessary. Additionally, it may be appropriate to use
an ATS when site constraints inhibit the ability to construct a correctly sized sediment basin,
when clay and/or highly erosive soils are present, or when the site has very steep or long
slope lengths.
● What are the NALs for Risk 2 and 3. Answer: pH <6.5 and >8.5
● Receiving Water Monitoring Triggers. Answer: For Risk level 3
● What is a Qualifying Event?. Answer: 1/2" or more of discharges over a period of time in
which there is no break in rain > 48 hrs
