Print or download the listed course materials, and bring them to class.
Grading and Base Tester Certification (GBTC)
Prerequisites for certification
- You must be certified in Aggregate Production Tester (APTC) before this certification will be awarded to you.
- We highly recommend you take the courses in this order: APTC, GBTC.
Expiration and recertification options
- This certification expires after five seasons.
- A recertification must be completed before the end of the fifth training season.
- If your certification has recently expired and you have relevant work experience, you may apply to regain MnDOT certification through a Recently Expired Certification Exam. Otherwise, you must take the initial certification course again to regain certification.
Class logistics
- Learning mode: In person for classroom and lab
- If you need to register: Learn about the certification process and then register for the class.
- Logistics: See the Registration Confirmation and Class Reminder emails from Lake Superior College for class dates, time, location, and directions. Time will be provided for on- or off-site lunch. No meals or beverages will be provided.
- Learning differences and accommodations: If you have a disability or learning issue, either permanent or temporary, which might affect your ability to perform in a class, the online exam, or the performance exam, contact Suzanne Johnsrud, 218-428-1002, to discuss possible accommodations.
- Summary: GBT Certification Summary (PDF)
- Professional development hours (PDHs): 18
- Lake Superior College course credits possible: 1 (you must complete an LSC course credit form)
What to bring to class
Print and bring to class
Download these files on a laptop or tablet you’re bringing to class; OR print and bring to class
Reference books/manuals to bring (hard copy or electronic)
- None
Also bring to class
- Calculator
- Paper and pencil/pen
- Laptop/tablet (recommended)
- Face mask (for health and safety, if needed)
- Lunch and beverages to eat/drink if you plan on site
- Hard toed shoes and other safety gear for lab (recommended)
About the certification exams
Written exam process
- You will have 120 minutes to complete the 50-question written exam online.
- You must score 70% or higher to pass; if you score 60-69%, you may request a retest.
- The exam will open for you at the end of the last day of class.
- You must complete the exam within one week after it is open for you, meaning the same day the following week.
- Find your exam to take it once it is open for you.
Written exam topics (approximate percentage of exam)
- Content knowledge needed for the work (15%)
- Procedures and documentation (40%)
- Specific test procedures (45%)
Materials allowed during the written exam
This is an open book exam. You may use the training manual and all other course materials during the exam. A calculator is provided within the online exam.
Performance exam
- You will complete a performance exam during your lab session on the second day of class.
- The certification will not be awarded until the performance exam is complete and recorded.