Technical Certification Program

To arrange your annual Independent Assurance review or to schedule your Bituminous Plant Tester performance exam

• Kris Westerbur, Independent Assurance
  Office: 218-725-2737
  Mobile: 218-348-6297

To submit a Bituminous Mix Design

• Ray Betts
  Maplewood Bituminous Research Lab
  651-366-5469

To arrange your annual Independent Assurance review

• Raymond Wesley, Independent Assurance
  Office: 218-755-6545
  Mobile: 218-766-6949

To schedule a Bituminous Plant Tester performance exam

• Jason Kissel
  218-755-6542

To submit a Bituminous Mix Design

• Ray Betts
  Maplewood Bituminous Research Lab
  651-366-5469

To arrange your annual Independent Assurance review

• Matthew Miles, Independent Assurance
  Office: 218-828-5753
  Mobile: 218-232-6748

To schedule a Bituminous Plant Tester performance exam

• Tom Boser
  218-821-3764

To submit a Bituminous Mix Design

• Ray Betts
  Maplewood Bituminous Research Lab
  651-366-5469

To arrange your annual Independent Assurance review

• Casey Clarke, Independent Assurance
  Office: 218-846-3613
  Mobile: 218-849-7373

To schedule a Bituminous Plant Tester performance exam

• Bruce Bryngelson
  218-846-3614

To submit a Bituminous Mix Design

• Ray Betts
  Maplewood Bituminous Research Lab
  651-366-5469

General questions

• 651-234-7354

To arrange your annual Independent Assurance review

• Greg Bohmert, Independent Assurance
  651-775-1005
• Kaleb Kollmann, Independent Assurance
  651-478-0339
• Zachary Lyrek-Hanks, Independent Assurance
  651-775-1018
• Erik Teiken, Independent Assurance
  651-775-0998
• Brad Worthington, Independent Assurance
  651-775-1151

To schedule a Bituminous Plant Tester performance exam or to submit a Bituminous Mix Design

• Ray Betts
  Maplewood Bituminous Research Lab
  651-366-5469

To arrange your annual Independent Assurance review

• Dennis Hayes, Independent Assurance
  507-251-0138

To schedule a Bituminous Plant Tester performance exam

• Scott Swanson
  507-286-7580

To submit a Bituminous Mix Design

• Ray Betts
  Maplewood Bituminous Research Lab
  651-366-5469

To arrange your annual Independent Assurance review

• Mitch Jordahl, Independent Assurance
  Office: 507-304-6187
  Mobile: 507-380-9619

To schedule a Bituminous Plant Tester performance exam

• Lee McLaughlin
  507-304-6186

To submit a Bituminous Mix Design

• Ray Betts
  Maplewood Bituminous Research Lab
  651-366-5469

To arrange your annual Independent Assurance review

• Paul Janke Jr, Independent Assurance
  Office: 320-214-6348
  Mobile: 320-212-5739

To schedule a Bituminous Plant Tester performance exam

• Jon Vlaminck
  320-894-7409

To submit a Bituminous Mix Design

• Ray Betts
  Maplewood Bituminous Research Lab
  651-366-5469