---
title: Engineering
---

# ENGINEERING

## Engineering Team

 Director, FCPA

### Douglas J. Holdener, P.E.

**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](mailto:dholdener@concretepipe.org)**

![Doug Holdener - Circle Crop-1](https://9491265.fs1.hubspotusercontent-na1.net/hub/9491265/hubfs/Doug%20Holdener%20-%20Circle%20Crop-1.jpg?width=300&name=Doug%20Holdener%20-%20Circle%20Crop-1.jpg)

 Technical Resource Engineer, County Materials

### Arnaldo Lopez

**3 yrs. Experience**

- Precast / Concrete Pipe Manufacturing
- Quality Control
- Pipe Inspections/Assessments
- Technical Specifications

**University of Central Florida (****B.S. Construction Engineering)**

[**Email Arnaldo**](mailto:Arnaldo.Lopez@CountyMaterials.com)

![Arnaldo Lopez - Circle Crop-2](https://9491265.fs1.hubspotusercontent-na1.net/hub/9491265/hubfs/Arnaldo%20Lopez%20-%20Circle%20Crop-2.png?width=300&name=Arnaldo%20Lopez%20-%20Circle%20Crop-2.png)

 Technical Resource Specialist, Rinker Materials

### Melitza Avila

**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](mailto:melitza.avila@rinkerpipe.com)

![Melitza Avila - Circle Crop-1](https://9491265.fs1.hubspotusercontent-na1.net/hub/9491265/hubfs/Melitza%20Avila%20-%20Circle%20Crop-1.jpg?width=300&name=Melitza%20Avila%20-%20Circle%20Crop-1.jpg)

 Technical Resource Engineer, Rinker Materials

### Russell Tripp, P.E.

**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](mailto:Russell.Tripp@RinkerPipe.com)**

![Russell Tripp  Circle Crop-1](https://9491265.fs1.hubspotusercontent-na1.net/hub/9491265/hubfs/Russell%20Tripp%20%20Circle%20Crop-1.jpg?width=300&name=Russell%20Tripp%20%20Circle%20Crop-1.jpg)

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