Evaluation of Best Management Practices Maintenance Conditions

The city of Bellevue, in collaboration with Aspect Consulting, 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 

The study will continue until April 30, 2024.

Project tasks and key deliverables

  1. Technical Advisory Committee (TAC) and Project administration 
    • TAC meeting agendas and minutes: TAC#1, TAC#2, TAC#3, TAC#4, TAC#5 
    • Progress reports
      • 2022Q1,Q2, Q3, Q4
      • 2023 Q1, Q2, Q3, Q4
      • 2024 Q1
  2. Survey permittees on BMP maintenance 
  3.  Research published BMP maintenance data 
    • Technical memorandum of published data analysis 
  4. Interview Ecology staff (Engineers and permit writers) 
    • Interview questions
    • Technical memorandum 
  5. Pilot data analysis of permittee O&M data 
    • Technical memorandum 
  6. White paper 
  7. Communication Plan 
    • Presentation to SWG
    • Fact sheet 
    • Presentation to local stormwater group