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WPCF Headworks Replacement Project Scope of Work <br />2 <br /> <br /> Installation of three vortex-style grit separation units, located downstream of the screen <br />channels, to remove inorganic solids from the plant influent flow. <br /> A grit pumping system will be housed in a dedicated room adjacent to the grit separation <br />units for grit handling and transfer. <br /> A Parshall flume and ultrasonic sensor will be installed downstream of each screen for <br />process and flow monitoring. <br /> A standalone carbon-based odor control system will be constructed adjacent to the <br />headworks building to mitigate odors generated from the preliminary treatment processes. <br />The odor control system includes the associated ductwork and ventilation systems. <br /> Rerouting of the five existing influent pipelines to the new headworks structure and <br />installation of flow monitoring on pipelines not currently monitored. <br /> <br />automated operation and monitoring. <br /> Building design includes lighting, HVAC, and fire suppression systems. <br /> A new septage receiving station will be located immediately adjacent to the headworks <br />facility to accommodate hauled waste from external sources. The septage receiving station <br />will include coarse debris screening, storage tank(s), and data logging for haulers. <br /> A 24,000 square foot ground improvement, constructed adjacent to the headworks building, <br />for enhanced ground stability and seismic resiliency. <br /> A new bypass system will be constructed on the existing influent piping located on the <br />western side of the Snohomish River. The bypass system will facilitate isolation of the <br />parallel 30-inch diameter influent pipelines. <br />Following completion of the intermediate design phase, the project team will reassess the scope and <br />budget to reflect the actual headworks facility design requirements. At that time, an amendment will <br />be issued to: <br /> Incorporate revised scope elements based on confirmed design criteria, facility configuration, <br />and construction packaging. <br /> Update the scope and design budget to include project phases 700,710, 720, and services <br />during constriction. <br /> Identify and formally include any work previously considered out-of-scope, as outlined in the <br />following document, due to initial design uncertainties. <br />This future amendment will ensure the project remains aligned with technical, operational, delivery <br />method, and financial expectations as the design progresses. <br />This scope of work (Exhibit A) for the design of the project herein includes the eleven phases <br />identified in black text in the following table. The initial project contract includes scope and budget <br />for phases 100 through 650 and phase 780. The scope and budget will be amended during <br />intermediate design to include phases 700, 710, 720, and services during construction. <br /> <br />construction.