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WPCF Headworks Replacement Project Scope of Work
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<br />Task 405 Alternatives Analysis and Facility Planning
<br />Objective: Select preferred alternatives for the individual elements of the headworks project.
<br />Alternatives analysis solidifies decisions so that detailed design can move forward with clear focus
<br />and mutual understanding to avoid costly rework and delays during detailed design.
<br />During this phase of the project, the design team will evaluate a range of conceptual options for key
<br />system components, such as pumping, screening, grit removal, flow control, and bypass. The
<br />alternatives analysis process will involve technical assessments, cost comparisons, and operational
<br />considerations to identify preferred alternatives for each element of the headworks. The team will
<br />then present these findings to the City in individual topic-specific workshops (Task 403) to gather
<br />feedback, refine selections, and integrate the City's preferences into the final predesign
<br />recommendations.
<br />Activities/Approach:
<br />Evaluate the following topics:
<br />Process sequence: Evaluate multiple alternatives for the sequence of headworks processes,
<br />including the order and integration of pumping, screening, and grit removal. Consider operational
<br />efficiency, maintenance access, redundancy, and compatibility with future plant upgrades. The
<br />findings from this analysis will be included in the main body of the alternatives analysis report.
<br />Number of structures and location: Compare alternatives for consolidating the new headworks into a
<br />single building versus distributing functions across multiple structures. Identify and evaluate
<br />potential site locations based on constructability, operational efficiency, site constraints, and
<br />integration with existing infrastructure. The findings from this analysis will be included in the main
<br />body of the alternatives analysis report.
<br />Pumping: Evaluate pumping alternatives, including pump type (e.g., Archimedes screw, submersible,
<br />etc.), capacity, redundancy, and preliminary layout. Consider energy efficiency, City standards, ease
<br />of maintenance, and compatibility with upstream and downstream hydraulic conditions. This work
<br />includes vendor outreach, coordination, and development of vendor quotes. The findings from this
<br />evaluation will be included in the main body of the alternatives analysis report.
<br />Screens and washer compacter: Evaluate screening system alternatives, including screen type,
<br />capacity, and redundancy. Assess options for screenings conveyance, storage, and hauling, with
<br />attention to odor control, ease of maintenance, City standards and preferences, operational safety,
<br />and process accommodations necessary for the anticipated plant nitrogen removal improvements.
<br />This work includes vendor outreach, coordination, and proposal development. The findings from this
<br />analysis will be included in the main body of the alternatives analysis report.
<br />Grit and grit washer: Assess grit removal system alternatives, incorporating findings from the grit
<br />characterization study. Evaluate equipment types, sizing, and layout to confirm effective removal and
<br />washing of grit, with flexibility to accommodate future nitrogen removal upgrades. This work includes
<br />vendor outreach, coordination, and proposal development. The findings from this analysis will be
<br />included in the main body of the alternatives analysis report.
<br />Odor control: Evaluate odor control alternatives for the new headworks, including type (e.g., carbon
<br />scrubbers, biofilters), location, and enclosure strategies. Develop a temporary odor control plan for
<br />construction activities, if needed, to minimize community and worker impacts. This analysis will also
<br />evaluate the potential to optimize plant odor control through consolidation of the headworks and
<br />primary clarifier odor control systems. This work includes vendor outreach, coordination, and
<br />proposal development. The findings from this analysis will be included in the main body of the
<br />alternatives analysis report.
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