Making an Impact on Trenchless Technology

NASSCO’s Technical Advisory Council advocates for NASSCO members and our industry.

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Since my introduction of NASSCO’s Technical Advisory Council just over a year ago, NASSCO has fortified its ability to provide solid technical knowledge and support to NASSCO members and our industry.

Comprised of five industry leaders, the TAC is committed to remaining objective, representing all trenchless solutions and staying current on new and emerging technologies to achieve NASSCO’s goal to become the industry source for education, technical resources and advocacy. The five TAC members include:

Christopher Garrett, P.E., vice president, Brown and Caldwell, Virginia Beach, Virginia: As co-leader of Brown and Caldwell’s National Aging Infrastructure Initiative, Garrett is an advocate of providing objective recommendations for all trenchless technologies. One of NASSCO’s first Pipeline Assessment and Certification Program trainers, he has trained more than 1,200 industry professionals since 2002 and serves as the TAC’s chair in successfully leading its members.

Chris Macey, P.E., America’s Practice Leader for Condition Assessment and Rehabilitation, AECOM Canada: Inducted into the North American Society for Trenchless Technology’s Hall of Fame in 2019, Macey brings to NASSCO 40-plus years of experience in material failure assessment for gravity and pressure service; knowledge in pipeline materials, pipe/soil interaction and pipeline deterioration processes; and a deep understanding of all condition assessment and rehabilitation technologies.

Lynn Osborn, P.E. owner, LEO Consulting: Osborn has served as NASSCO’s technical director since 2015. He is a leader in CIPP technologies, having worked for Insituform starting in 1984, when the technology was attempting to gain traction in North America. A trainer of NASSCO’s ITCP-CIPP since 2016, Osborn was named Trenchless Technology magazine’s Person of the Year in 2016, Underground Construction magazine’s 2019 MVP and was inducted into NASTT’s Hall of Fame in 2020.

Kaleel Rahaim, pursing a master’s degree in civil engineering: Formerly employed (from 1989-2018) by Interplastic, Rahaim, who currently holds a bachelor’s degree in chemical engineering, is continuing his education and wishes to give back to the industry through his role as a NASSCO TAC member. An instructor of NASTT’s CIPP Good Practices Course and a member of NASTT’s Hall of Fame, Rahaim is also a highly committed and active NASSCO committee member.

Jerry Weimer, owner, Jerry Weimer Consulting: Having worked for more than 30 years for the city of Cincinnati’s Metropolitan Sewer District, where he developed the city’s Cross Bore Prevention Program, Weimer brings a well-rounded perspective to the TAC. A highly active NASSCO committee co-chair and PACP/MACP/LACP trainer, Weimer was named NASSCO’s Trainer of the Year in 2019.

The collective experience of the five NASSCO TAC members is beyond impressive. Combined, these five gentlemen represent:

• 200 years of experience in the assessment, maintenance and rehabilitation of underground infrastructure

• 30-plus years of experience in PACP and ITCP training

• 2,000-plus miles of condition assessment performed

• 2,000-plus manholes rehabilitated, designed and constructed

• 20,000-plus miles of pipe rehabilitation, design and construction

• 20,000-plus vertical linear feet of MACP manhole inspections

To learn more, visit To contact NASSCO’s TAC directly with a technical question, email 


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