Title
Catch Basin Sediment Analysis Project Overview
Recommended Action
Briefing only. No action required.
Report
Issue:
Catch Basin Sediment Analysis Status Update
Staff Contact:
Kane Osstifin, Senior Stormwater Program Specialist, Public Works Water Resources
360.485.2673
Presenter:
Kane Osstifin, Senior Stormwater Program Specialist, Public Works Water Resources
Background and Analysis:
Olympia's stormwater drainage system is regulated under the National Pollutant Discharge Elimination System Municipal Phase II Stormwater Permit (NPDES Permit) administered by the Washington State Department of Ecology. The NPDES Permit requires jurisdictions to inspect all public catch basins every two years, unless maintenance records of double the length of time of the proposed inspection frequency determine a different frequency rate is justified. To evaluate an appropriate catch basin inspection frequency rate, Storm and Surface Water Utility (Utility) staff evaluated eight years of catch basin sediment data. The inspection frequency change was evaluated to determine how the Utility can increase efficiency of meeting current NPDES Permit requirements and to be better prepared for increasing requirements in future NPDES Permits.
During the briefing, staff will provide details on how the analysis was completed and the results of the Catch Basin Sediment Analysis Project.
Climate Analysis:
Catch basin inspections and maintenance protects aquatic ecosystems by capturing and removing pollution particles from roadways. A reduction in catch basin inspection frequency would decrease the City's greenhouse gas emissions through more efficient use of the Utility's vactor truck, reducing vehicle idling and time in transit.
Equity Analysis:
The Catch Basin Sediment Analysis Project provides the potential to create efficiencies in regularly scheduled public catch basin inspections, thereby allowing the Utility to begin a stormwater pipe cleaning program. This project also a...
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