Project Manager Mackenna Bell PE April 7 2023 October 2020 Overview of Drainage Districts WHAT WE DO Water Conveyance Emergency Preparedness amp Response Levee Maintenance 13 th Ave PS Discharge Lines Rehab Project Background ID: 1045040
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1. NE 13th Ave Pump Station Discharge Lines Rehabilitation ProjectProject Manager: Mackenna Bell, P.E.April 7, 2023October 2020
2. Overview of Drainage DistrictsWHAT WE DO Water ConveyanceEmergency Preparedness & Response Levee Maintenance
3. 13th Ave PS Discharge Lines Rehab Project BackgroundOne of two essential pump stations for Peninsula Drainage District #2 (PEN2) that discharges water into the Columbia SloughConstructed in 198230” discharge lines at 13th Ave Pump Station are no longer structurally supported by the riverward levee slopeScope of project expanded upon completing site and condition assessment
4. 13th Ave PS Discharge Lines Outfall Scour12-foot-deep scour hole created in slough beneath outfall from force of water leaving pipesRegulatory requirements to address water qualityIf not addressed, levee toe will continue to erodeMitigate by adding energy dissipation to outfall, hole will fill in over time from natural sedimentationNew discharge structure and energy dissipation fitting will be integrated into upcoming U.S. Army Corps of Engineers (USACE) Portland Metro Levee System (PMLS) improvement projects
5. 13th Ave PS Discharge Lines Levee SupportLevee degradation caused by scour from outfall, continues to worsen each rainy seasonCritical need is to restore the levee slope with fill to re-support pipes and stabilize levee
6. 13th Ave PS Discharge Lines DesignSelf-mitigating design to meet water quality and habitat requirementsInstalling new discharge structure and energy dissipator fitting is most cost-effective option to protect levee slope and meet regulatory requirementsDischarge structureInstalling helical piles for support will allow us to avoid the need to dewater during construction which is a substantial cost-saving
7. 13th Ave PS Discharge Lines BudgetBudget Line Item IFA Funding (SPWF) Non-IFA Funding Total Engineering/Permitting $ 41,100 $ 41,100 Engineering/Permitting (Pre-Award) $ 362,900 Construction $ 720,000 $ 183,000 $ 903,000 Construction Contingency $ 87,100 $ 87,100 Construction Materials (pre-award) $ - Land Acquisition $ - Legal (pre-award) $ 9,200 $ 9,200 Construction Management $ 203,400 $ 203,400 Totals $ 720,000 $ 886,700 $ 1,606,700
8. 13th Ave PS Discharge Lines Schedulewe are here
9. Thank you!Questions?