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Date: <br />To: <br />From: <br />Prepared By: <br />Subject: <br />sD <br />Consent Agenda Item <br />INDIAN RIVER COUNTY, FLORIDA <br />DEPARTMENT OF UTILITY SERVICES <br />April 3, 2017 <br />Jason E. Brown, County Administrator <br />Vincent Burke, P.E., Director of Utility Services <br />Arjuna Weragoda, P.E., Capital Projects Manager <br />Work Order No. 13 with KHA — Roseland Elevated Tank Conversion -UCP 4136 <br />DESCRIPTIONS AND CONDITIONS: <br />Indian River County Department of Utility Services (IRCDUS) maintains and operates three (3) elevated tanks, <br />specifically known as Kings Highway, Gifford and Roseland tanks. The existing elevated remote storage tanks <br />provide system storage and are intended to provide water supply during high demands. Normal operation is to <br />fill during low demands and drain during high demands, allowing turnover of the water within the tank to <br />prevent stale water. Altitude valves are typically used at elevated tanks to prevent overflow of the tank during <br />low demands/higher system pressures, but then open during high demands/low system pressures to allow <br />supply of water to the system. <br />The Roseland elevated tank is a steel hydro -pillar type that has a common inlet/outlet pipe that operates <br />similarly to the Gifford tank. The existing Roseland tank configuration does not function as a normal elevated <br />storage tank that provides capacity during peak system demands. Due to elevation limitations, the tank cannot <br />operate properly and can only provide fire flow and peak hour pumping capacity when system pressures are <br />Tess than 45 psi. Typically the County watermain system is maintained at a pressure of approximately 65 psi. <br />System pressures of less than 45 psi are experienced when a main break occurs or county -wide flushing has <br />been undertaken. <br />Kimley-Horn and Associates (KHA), IRCDUS's consulting engineer, considered a few options for the Roseland <br />tank. The following were considered and evaluated: <br />• Option 1: Remove the tank from service and demolish, <br />• Option 2: IRaise the tank to the proper elevation, or <br />• Option 3: Convert the tank to a remote "elevated" ground storage tank and booster pump station <br />Option 1: Based on existing operating conditions and hydraulic profiles, the tank is not useful and should be <br />removed from service. This option considers the tank useless and should be demolished and removed from <br />service. The Roseland tank is approximately 21 years old. <br />From an operational standpoint, the existing tank in its current configuration is dysfunctional. Additionally, <br />although fire flow capacity can be met without the Roseland tank, it is believed that an elevated tank or <br />C:\Users\GRANIC-1\AppData\Local\Temp\BCL Technologies\easyPDF 7\@ BCL@58054AA9\@BCL@58054AA9.docx <br />P33 <br />