Evaluation of Best Management Practices Maintenance Conditions

The city of Bellevue, in collaboration with Herrera Environmental Consultants, will evaluate the maintenance thresholds or conditions for the following stormwater Best Management Practices (BMPs): ponds, vaults, trenches, and tanks. Findings will suggest how permittees might adjust BMP maintenance efforts to maximize overall environmental outcomes to meet permit requirements.

Study objectives

Gather information about maintenance practices from permittees' operation and maintenance programs, and published research data.
Develop a white paper that includes the synthesis of the local and published BMP maintenance practices, and recommendations for inspection and maintenance conditions.

Study findings

Contract IAA & Scope of Work; Amendment 1

The study will continue until February 28, 2025.

Project tasks and key deliverables

Technical Advisory Committee (TAC) and Project administration
- TAC meeting agendas and minutes: TAC#1, TAC#2, TAC#3, TAC#4, TAC#5
- Progress reports
  - 2022: Q1,Q2, Q3, Q4
  - 2023: Q1, Q2, Q3, Q4
  - 2024: Q1, Q2
Survey permittees on BMP maintenance
- Technical memorandum: Survey of Municipal Stormwater Operations and Maintenance Programs
Research published BMP maintenance data
- Draft technical memorandum of literature and Ecology responses
- Final Technical memorandum of literature and Ecology responses
Interview Ecology staff (Engineers and permit writers)
- Interview questions
Pilot data analysis of permittee O&M data
- Data request
- Draft technical memorandum
- Final technical memorandum
White paper
- Draft white paper
- Final white paper
Communication Plan
- Presentation to SWG
- SAM Fact sheet
- Presentation to local stormwater group

Contact information

Chelsea Morris
Stormwater Action Monitoring Scientist
chelsea.morris@ecy.wa.gov
564-999-3052