See the different material certification types in Section 106-3 of the 2024 Specifications.
For questions about the age of a material certification, contact the Area Materials Engineer in your division for assistance.
One Material Certification type CANNOT be used in lieu of another despite being similar as the note mentions in Type 4 here.
If the minimum sampling guide requires you to have a certification then one must be obtained. Also check the Minimum Sampling Guidefor any material (s) in question. (Select Material from Product Group Dropdown).
NCDOT maintains a Producer / Supplier database. Click on the "Facility Type" dropdown. For other questions, contact the Field Operations Engineer or an Area Materials Engineer in your Division.
