Engineering Team

Doug Holdener - Circle Crop

Douglas J. Holdener, P.E.

Director, FCPA

25 yrs. Civil Engineering Experience

  • Engineering Consultant
  • Concrete Pipe Producer
  • Florida Power & Light Contractor

Texas A&M University (M.S. in Civ. Eng.)

Washington University in St. Louis (B.S., C.E.)

Email Doug

Angel De Jesus - Circle Crop

Angel De Jesus, P.E.

Technical Resource Engineer, County Materials

42 yrs. Experience

  • Pressure Pipe
  • Reinforced Concrete Pipe
  • Precast Structural Engineering
  • Pipeline Engineering
  • Manufacturing, Quality Control/Assurance

Licensed P.E. in Florida

University of Puerto Rico – Mayaguez Campus (B.S. Civil Engineering)

Email Angel

Melitza Avila - Circle Crop

Melitza Avila

Technical Resource Specialist, Rinker Materials

14 yrs. Experience

  • Concrete Pipe Manufacturer
  • Stormwater Management

ASTM Cmte. Member

  • C13 – Concrete Pipe
  • C27 – Precast Concrete Products
  • F17 – Plastic Piping Systems
  • F36 – Technology and Underground Utilities

Email Melitza

Russell Tripp  Circle Crop

Russell Tripp, P.E.

Technical Resource Engineer, Rinker Materials

20 Yrs. Experience in Natural Gas Industry

20 yrs. Experience in the Drainage Industry

Licensed P.E. in CA, FL, GA, SC & TX

Clemson University (B.S. Civil Engineering)

Email Russell