Preston "Skip" Lewis, P.E. – President/Senior Project Manager

Mr. Lewis has more than 25 years of experience in project management and engineering of public infrastructure projects. He specializes in potable water, wastewater and reclaimed water facilities planning, design/engineering services, project construction and start-up. He has managed large projects in excess of $30 million dollars in construction value. Mr. Lewis is responsible for project quality and technical reviews at IEC while also serving as its president. Skip has a Bachelors of Science degree from Gonzaga University and a Masters in Business Administration from National University. Contact.

Rob Weber, P.E. – VP/Senior Project Manager

Mr. Weber has 19 years of experience in project management and engineering. He has extensive experience in pipeline, reservoir and pump station planning and design. Mr. Weber has successfully worked with clients to complete design and construction projects, secure permits, project community acceptance, and interagency approvals. Rob is a graduate of State University of New York at Buffalo with a Bachelors of Science degree in Civil Engineering. Rob is also a commissioned officer in the California Army National Guard and is a veteran of a Homeland Defense deployment as part of Operation Noble Eagle II. Contact.

Anna Buising, Ph.D., P.G. – Principal/Environmental Services

Dr. Buising specializes in CEQA, NEPA, and permitting for water infrastructure, flood protection, municipal public works, and habitat restoration and conservation projects, and is a skilled provider of meaningful community outreach to support the compliance process. She also brings expertise in geohazards abatement planning and paleontological resources compliance. As a project leader, Dr. Buising is known for responsive client service; reader-friendly, technically sound, and highly defensible CEQA/NEPA documents; and adaptive, effective solutions to schedule and budget challenges. She is also adept at evaluating compliance needs and developing integrated strategies that efficiently balance multiple regulatory demands. Dr. Buising has been an invited presenter on regulatory and geologic topics at numerous venues and has taught CEQA compliance and mitigation development for university, private, and municipal clients. She received her B.S. degree from UCLA and her Ph.D. from UC Santa Barbara, and holds active memberships in AEG and APWA. Contact.

Scott Humphrey, P.E., GISP– Principal/Planning & Information Systems

Mr. Humphrey has over 17 years of experience in water, wastewater, and reclamation master planning, water and wastewater hydraulic modeling, and Geographic Information Systems (GIS). He has specialized in the development of master plans and hydraulic models through GIS integration. He is an expert in computer hydraulic modeling using WaterCAD (Cybernet), WaterGEMS, SewerCAD, SewerGEMS, H2ONET, H2OMap Sewer, H2OMap Water, InfoSewer, InfoSWMM, MOUSE, InfoWater, HYDRA, and XP-SWMM. His expertise also includes Geographic Information Systems (GIS) using ArcView GIS, ArcINFO, ArcGIS and AutoCAD Map. Contact.

James G. Ashcraft, P.E. – Senior Project Manager

Mr. Ashcraft has more than 32 years of experience in the planning, design and construction of water, wastewater and water reclamation systems, including treatment plants, pump stations, force mains and water distribution pipelines. His experience includes several design-build projects for treatment plants, desalination systems and pump stations. He has also been in charge of several groundwater management studies, including the investigation and development of resource recovery programs for groundwater basins. He holds a Master's Degree from the University of Washington, Seattle in Sanitary Engineering. Contact

Ken Beck – Construction Manager

Mr. Ken Beck has over 23 years experience in construction management, contract administration, inspection and quality assurance of civil construction projects, including mass grading with blasting, water and wastewater pipelines and facilities, roadways, airports, heavy highway, public utilities, and commercial and residential developments. Mr. Beck also has extensive experience in soil, concrete, and asphalt quality control as well as materials testing. He holds certifications from the American Concrete Institute, OSHA, and the Federal Aviation Administration. Mr. Beck specializes and leads our team in airfield construction management and quality assurance inspections services. Contact