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Posted on: October 8, 2019

Wastewater Treatment Plant High Priority Improvements on Target for October 2020 Completion

WWTP photo - 10-3-19

Construction of the Wastewater Treatment Plant (WWTP) Phase 1 improvements are on schedule for completion in October 2020. On Thursday, October 3, 2019, McClure and Sons placed 280 cubic yards of concrete for the base of the new secondary clarifier and an additional 20 cubic yards of concrete for the mixed-liquor splitter box. The concrete stem walls for the ultraviolet disinfection building were poured on September 26th. 

Background: On September 1, 2015, City Council approved a contract awarding an engineering services contract to an engineering firm to create a Wastewater System Facilities Plan and to perform a sanitary sewer rate study based on that Plan.  The Plan is a comprehensive planning document for all elements of the City’s wastewater system – collection, treatment, biosolids management and effluent disposal or reuse.  It addresses all areas currently served by the City’s wastewater system as well as those expected to be served by the system within the 20-year planning period. The facilities plan identifies improvements needed to collect and treat wastewater in the City’s sewer service area and provides a Capital Improvement Plan (CIP) to implement the improvements over the next 20 years.

The Plan was approved by WA State Department of Ecology which preceded a detailed WWTP design comprising the following professional disciplines: geotechnical engineering, mechanical engineering, electrical engineering, surveying, civil engineering, and structural engineering. In 2018, City staff reviewed the engineering design and advertised the project for construction. The project began construction in 2019. Some of the goals of the WWTP improvements are to meet more stringent environmental requirements, improve operations, increase employee safety, create needed redundancy in the system, and update with more reliable parts and facilities. This WWTP project meets the City of North Bend’s Mission Statement which is to “Build and Maintain Adequate Infrastructure.”

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