Professional Services Agreement - Arcadis US Inc - Secondary Treatment and Disinfection Improvements at WWTP

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The City will replace the existing doors and windows in the building and have masonry improvements made as part of a separate project. This will be important to ensure air tightness in the building for the scrubber. The existing building will be evaluated, and recommendations only will be made for necessary improvements beyond those described here (i.e. new coatings for crane rail system). This scope does not include design of those recommendations. The chemical equipment is electrically fed from its associated building, which is currently being replaced through another City project and is assumed can be reused. The City will continue to control the disinfection system as it is today. The existing PLC will be replaced to accommodate the new equipment and safety features and HMI screens will be updated. The existing chlorine residual analyzer, ammonia analyzer and level instruments at the effluent weirs within the chlorine contact tank will be reused. The location of the level transducer may need to be improved to provide a better, more accurate flow measurement with the increased water surface elevations at higher peak flows. In addition to the permanent system expansion, a simple temporary disinfection system will be designed to ensure continued disinfection during construction of these disinfection improvements. Note that the existing groundwater dewatering systems to prevent tank uplift are not functional. Temporary dewatering will be specified to be provided by the contractor for tank protection. This will be included as a separate bid item. The location of temporary wells will need to be restricted due to the electrical and communication duct banks in this general vicinity. Arcadis and its subconsultant will prepare bidding documents, provide assistance during bidding and perform construction administration services. The City will perform construction inspection. The subconsultant Donohue & Associates, Inc. will evaluate and confirm the return sludge pumps (including drain) for Final Clarifier Nos. 1 through 5, replace the Aeration Tank Nos. 1 through 4 Pass 2 gates, and provide electrical and I/C work for all project components. A SharePoint site will be established for use during design, and PMIS will be established for use during construction. The scope of engineering services shall include the following: 1. Project Management. Provide project management including scope, budget and schedule control; project coordination; maintenance of records; project setup, invoicing, and close-out. 2. Kick-off and Design Review Meetings. Meet with the City to kick-off the project including a site visit to perform initial above -ground field investigations. Meet in -person with the City monthly to share progress, resolve outstanding items, perform additional field needs, and review deliverables and design progress for 50% and 90% designs. In addition, up to four conference calls are included. 3. Survey. A survey may be required during design for key spot elevations. Any survey will be provided via subcontract services. A $5,000 allowance is provided if survey is needed. 4. Preliminary (50%) Design. Conduct a preliminary design including the following tasks. a. During the kick-off meeting, inspect Aeration Tank Nos. 1-4 from the surface to determine if shutting down one aeration tank is required to determine the gate replacement and weir extension needs. If required, the City will shutdown, dewater and clean one aeration tank for inspection at a follow-on visit. At that follow-on visit, inspect Final Clarifier Nos. 1 through 5 also to determine equipment replacement needs and extent of structural rehabilitation required. This will require the City to shutdown, dewater and clean one or two clarifiers at a time. b. Confirm existing return sludge pumps are adequate for process and to drain the tanks. c. Confirm hydraulics to determine aeration tank weir configuration and elevation. d. Confirm structural, instrumentation and control, and electrical needs. .....Wo as auPages (Exhibit A — Engineer's Services) EJCDC E-500 Agreement Between Owner and Engineer for Professional Services Copyright © 2008 National Society of Professional Engineers for EJCDC. All rights reserved.