ABOUT US | Key Personnel

Herb Fricke, PE, President, Cooper Zietz Engineers, Inc., is a civil/environmental engineer with over 25 years of experience in the consulting engineering field, with primary emphasis on water and wastewater facilities planning and design and process design. He has managed a wide range of projects; notable projects include wellfield improvements for Upper Skagit Indian Tribe, Washington; a groundwater remediation project for the Confederated Tribes of the Warm Springs Reservation, Oregon; water quantification and land classification on the Crow and Fort Belknap Indian Reservations for the Bureau of Indian Affairs, Billings Area Office; and numerous wastewater facilities planning and design projects for the City of Portland Bureau of Environmental Services. In addition, over the past seven years he has been responsible for civil engineering design support on numerous TriMet Light Rail Transit Projects in Portland, Oregon.
Paul Kluvers, PE, SE, General Manager/Sr. Structural Engineer, has over 30 years of experience as a civil and structural engineer, including design of water and wastewater facilities, fish hatcheries and fish passage facilities, schools and dormitories, offices and administrative buildings, and recreational facilities. Many of these projects, such as the Umatilla Governance Center new Public Safety Building, have incorporated “green building” components. Paul also has extensive experience in seismic analysis and rehabilitation of existing buildings and structures, including restoration of the historic longhouse at Celilo Village, Oregon and evaluation of existing buildings for ecoroof retrofit for the City of Portland. He is also experienced in design of port and waterfront facilities, most recently providing analysis and design of levee repairs at the Nestucca National Wildlife Refuge in Oregon, and structural design for a salt pond restoration project in California for the U.S. Fish and Wildlife Service.
Dennis Petrequin, Principal Planner, has over 30 years of experience in land use and comprehensive planning in the Pacific Northwest, the majority of it in Indian country. He is experienced in land use and infrastructure planning, site feasibility studies, capital improvements programming, and environmental assessments and impact statements. He has been involved with the Bureau of Indian Affairs transportation planning and road improvement program for over 20 years, completing more than 300 transportation plans in his career. Recent experience includes transportation planning for reservations in Oregon and Washington, including the Spokane Tribe of Indians, and the Confederated Tribes of Siletz Indians, and a land use and development procedural plan for the Pine Nut Allotments in Nevada for the Bureau of Indian Affairs.   
Paul Knox, P.E., Sr. Civil Engineer, has 15 years of engineering experience on a wide variety of planning and design projects. He has particular experience in stormwater management and hydrologic/hydraulic evaluations. Recent projects include an IDIQ-type contract for multiple road design projects on the Siletz Reservation, and the Nespelem School Loop Road and bridge improvement project for the Confederated Colville Tribes. He provided civil engineering design for improvements to Powell Butte Reservoir No. 2 and Kelly Butte Reservoir for the City of Portland, and has managed several water and wastewater system improvement projects at campgrounds and other facilities in Oregon and Washington under an IDIQ contract with the U.S. Forest Service.

Cascade Design Professionals | 2780 SE Harrison St., Suite 104 - Portland, OR 97222 | 503.652.9090 | Fax 503.652.9091

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