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"We provide efficient, flexible, and superior quality solutions to the most challenging engineering problems.

Our success is based on solid, lasting relationships with out clients, teams, and employees."


"To be the premiere small business enterprise (SBE) and minority business enterprise (MBE) in California water industry

by providing efficient, collaborative and quality engineering consulting solutions to our clients;

promoting personal and professional growth for our employees; and cultivating solid, lasting relationships within our community."


Saik-Choon Poh, PE
President, Civil/Environmental Engineer

Mr. Poh, President of DRP, specializes in environmental and civil engineering. He is experienced in water, stormwater, and wastewater conveyance and treatment facilities. As a key member of project teams, he has over 20 years of engineering experiences and has been responsible for directing work and coordinating closely with clients, subcontractors, contractors, and staff in multiple offices.  Prior to joining DRP, Mr. Poh worked for several Fortune 500 engineering firms and was the project manager to a number of large-scale projects.

Eric Leung, PE
Vice President, Director of Engineering

With more than 35 years of experience in the water and wastewater industry, Mr. Eric Leung serves as the Director of Engineering at DRP. He oversees company-wide operations and manages the internal departments that support DRP’s project teams. Prior joining DRP, Mr. Leung was the Deputy General Manager/Chief Engineer of Long Beach Water Department.  Mr. Leung also worked for City of Anaheim, Public Utilities Department - Water Engineering Division for 10 years. Mr. Leung has over 20 years of experiences in managing large-scale engineering projects.

Curt Roth, PE
Principal, Civil/Environmental Engineer

Mr. Roth a founding member of DRP.  He specializes in environmental and civil engineering. He has over 20 years of experiences in water, storm water, recycled water and wastewater conveyance as well as all aspects of water and storm water treatment. Mr. Roth worked for several Fortune 500 engineering firms and has tremendous experience in designing, constructing and operating new and innovative systems for the treatment of water.

Steve Dombovary
Senior Civil Engineering Designer

Steve Dombovary has more than 28-years of civil drafting and design experience ranging from small to multi-billion dollar Capital Improvement Projects. He understands the client’s needs and technical expectations.  Mr. Dombovary is the expert in civil design CAD/CAE, including application of Civil3D and InRoads. His specialties are in water conveyance pipeline, sewer/storm drain drafting and design, and in the development of complex grading plans and 3-dimensional linear/non-linear feature-based earthwork models. Mr. Dombovary will ensure the client deliverables are in compliance with drafting and design standards. 

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