Laserfiche WebLink
ARCADIS <br />ATTACHMENT A <br />ADDITIONAL SCOPE OF SERVICES <br />PROFESSIONAL ENGINEERING SERVICES <br />FOR <br />RAS AND WAS VFD AND ROTARY DRUM THICKENER <br />REPLACEMENT AT THE CENTRAL WASTEWATER PLANT <br />1 OVERVIEW <br />Design & Consultancy <br />for natural and <br />built assets <br />1.1 Background <br />Indian River County (COUNTY) operates the 4 MGD Central Region Wastewater Treatment Plant. A <br />condition assessment of the facility was recently completed as a part of the COUNTY asset management <br />program. During this assessment it was found that the Return Activated Sludge (RAS) Pumps and Waste <br />Activated Sludge (WAS) Pumps and associated piping and valves were in poor condition due to <br />equipment age and environmental corrosion and are recommended for replacement. The COUNTY has <br />requested a proposal from Arcadis U.S., Inc. (CONSULTANT) to provide professional engineering <br />services for design, phasing plan for operations and bidding, and limited construction administration <br />services. <br />The proposed work will be authorized under the Continuing Consulting Engineering Services Agreement <br />for professional engineering services dated April 17, 2018. The terms and conditions of the referenced <br />Contract apply. This scope is an addendum and the additional design items will be added on to the <br />existing scope of work approved on March 26, 2019. <br />1.2 Design Concept <br />The original design concept as discussed on a call between COUNTY and CONSULTANT on January 9, <br />2019 and approved by the County commission on March 26, 2019. The concept was then amended, and <br />additional scope was requested on May 3, 2019. The additional scope of services includes the following <br />items: <br />• Replace the existing VFD's for each of the RAS and WAS pumps (10 total) <br />• Replace the existing level sensors (4 total) with two (2) in the RAS/WAS splitter box and two (2) in <br />the thickened sludge storage tanks. <br />• Replace the existing 150 gpm rotary drum thickener (RDT) with a new unit rated at 300 gpm. <br />• Develop phasing plan for construction to ensure continued operation <br />• Develop bid documents, provide pre-bid support, and bid recommendation <br />