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Basin 1 Pump Replacement and Maintenance Project- State Environmental Policy Act (SEPA) Public Comment Period
Proposal
The Basin 1 Pump Replacement and Maintenance Project will upgrade the pump portion of an existing system by replacing the existing pump with a pair of submersible electric pumps. The project will include two new submersible pumps mounted on a concrete base, new discharge pipes, two in-line elastomeric check valves, a new agricultural shed, updated electrical service with Puget Sound Energy to the exterior of the shed, installation of electrical controls inside the shed, and new conduits between the shed and pumps. The new shed and electrical controls will be constructed on an existing farm pad and will be elevated at least 3 feet above base flood elevation. The system is located on an agricultural waterway that provides drainage for surrounding agricultural lands. The system is adjacent to the Snoqualmie River.
Project Documents
- State Environmental Policy Act (SEPA) Determination of Non-Significance
- SEPA Environmental Checklist
- Lista de Verificación Ambiental de SEPA
- Project Design
- Critical Areas Report
Contact
Project Manager: Lou Beck
Email: lou.beck@kingcounty.gov
Phone: 206-477-3232
Please submit any comments on this project to Lou Beck, the project manager, by June 30, 2026.
Do you have an agricultural field with poor drainage? If so, King County’s Agricultural Drainage Assistance Program (ADAP) can help. ADAP helps agricultural property owners keep water flowing off their agricultural lands by providing both technical and financial support.
How to I apply to this program?
Most ADAP projects need to get only one permit. Agricultural landowners need to follow these best management practices (BMPs) for drainage projects. If a property owner in an Agricultural Production District wants to help water flow their property, then they need to:
- Have an approved farm plan prepared in conjunction with the King Conservation District
- Follow the ADAP BMPs
- Apply for one, free permit, a Hydraulic Project Approval (HPA) from Washington Department of Fish and Wildlife
Am I part of an Agricultural Protection District?
The ADAP developed a classification system for agricultural waterways. This is one of the key parts of the permit process for maintaining water on agricultural lands. The waterway classification determines which BMPs are required for a waterway maintenance project. King County classified the waterways in the five Agricultural Production Districts:
- Snoqualmie River (1.8 KB)
- Sammamish River (629 KB)
- Enumclaw & Upper Green River (1.2 MB)
- Lower Green River (551 KB)
Waterways outside the Agricultural Production Districts will be classified as needed.
What do I need to do?
These are the four most common impacts to agricultural drainage:
ADAP created best practices to address these common impacts in the Manual of Best Management Practices for Maintenance of Agricultural Waterways in King County. This manual lists the best practices required to perform an ADAP project.