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�R <br />INDIAN RIVER COUNTY, FLORIDA <br />DEPARTMENT OF UTILITY SERVICES <br />Date: February 27, 2017 <br />To: Jason E. Brown, County Administrator <br />From: Vincent Burke, P.E., Director of Utility Services <br />Prepared By: Arjuna Weragoda, P.E., Capital Projects Manager <br />Subject: Emergency Purchase Order for Cell 14 Maintenance Work at West Regional <br />Wastewater Treatment Facility Wetland Treatment System <br />DESCRIPTIONS AND CONDITIONS: <br />Indian River County Department of Utility Services (IRCDUS) operates the West Regional Wastewater <br />Treatment Facility (WWTF) located on 81h Street, west of 82nd Avenue. The plant is currently permitted for <br />6.0 million gallons per day (MGD). The current IRCDUS West Regional WWTF has a 4.0 MGD annual <br />average daily flow (AADF) discharge from the created wetland to the Lateral D Canal, Class III fresh waters. <br />The West Regional WWTF, Permit No. FL0041637, was renewed April 12, 2016 with an expiration date of <br />April 11, 2021. <br />ANALYSIS: <br />The Wetland Treatment System (WTS) contains approximately 169 acres (135 wetted acres). Initially <br />treated WRWWTF effluent enters the WTS via an 11.38 acre polishing. pond. From the polishing pond, the <br />water is split between two deep water marshes, 3.51 and 4.29 acres respectively. From these cells, water <br />is split again into three subsequent deep water marshes of 6.76, 6.75, and 7.44 acres, respectively. Next, <br />the water is further split into four additional subsequent deep water marshes of 8.55, 8.55, 8.55, and 9.25 <br />acres, respectively. After these deep water marshes the water converges into three shallow water <br />marshes of 19.89, 19.72, and 19.51 acres, respectively. The final cell (Cell 14) prior to discharge is a 1.09 <br />acre storage pond with a control structure equipped with a manually operable weir (WEP-1), discharge <br />pipe, flow meter, and automatic sampling equipment. Cell 14 is currently inundated with dead cattails. <br />The cattail leaf litter (or dead stand crop) and associated bacteria/periphyton communities are most likely <br />having a significant negative effect on the water quality conditions in Cell 14. Therefore, the Department's <br />wetlands consultant, Ecotech, has recommended that the county hire a contractor to remove the dead <br />cattails with +/-1.0 to 1.5 -feet of sediment through mechanical methods. Once the sediment is removed, <br />the consultant's goal is to hydrate Cell 14 to approximately a 3 -foot depth with submerged aquatic <br />vegetation. <br />C:\Users\GRANIC"1\AppData\Local\Temp\BCL Technologies\easyPDF 7\@BCL@880561C4\@BCL@880561C4.docx <br />P161 <br />