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EXHIBIT A <br />OTETRATECH <br />June 2, 2020 <br />Via email: aweragoda@ircgov.com <br />Mr. Arjuna Weragoda, P.E. <br />Indian River County Department of Public Works <br />1801 27th Street <br />Vero Beach, FL 32960-3388 <br />Subject: Proposal to Indian River County for the West Regional WWTFP <br />Florida Department of Environmental Protection Operating Permit Renewal <br />Tt # 200BP Indian River County <br />Dear Mr. Weragoda: <br />Tetra Tech, Inc. (Tetra Tech) is pleased to provide Indian River County Department of Utility Services <br />(IRCDUS) with this proposal for services to assist in the preparation of the West Regional Wastewater <br />Treatment Facility (WWTF) Florida Department of Environmental Protection (FDEP) Operating Permit <br />Renewal Application. <br />I. BACKGROUND <br />The IRCDUS owns and operates the West Regional WWTF, a 6.0 million gallons per day (MGD) annual <br />average daily flow (AADF) capacity domestic WWTF. The WWTF consists of two influent mechanical <br />bar screens, two grit removal units, two fermentation basins, two 1st anoxic basins, four aeration <br />basins, two 2nd anoxic basins, two reaeration basins, four secondary clarifiers, four tertiary filters, <br />and six chlorine contact chambers. The WWTF has sodium hydroxide and alum chemical feed <br />facilities. Also, the WWTF has a rotary drum thickener and an aerated sludge holding tank for <br />processing biosolids. <br />Effluent from the WWTF is disposed through a 4.0 MGD AADF Surface Water Discharge, D-001, from <br />the created wetland, R-001; a 6.97 MGD AADF slow -rate public access Land Application R-002 which <br />provides reclaimed water for irrigation public access reuse within the City's service area; and a 0.1 <br />MGD AADF Land Application R-003 rapid infiltration basin (RIBS). <br />R-001 is a 4.0 MGD-AADF, permitted capacity created wetland treatment/reuse system with 169+ <br />acres (135+ total wetted acres) and consists of an influent deep settling pond, with 9 deep marsh <br />flow-through cells and 3 shallow marsh cells with a final storage outfall cell. R-001 discharges to the <br />Lateral D Canal, Class III fresh waters, (WBID# 3153), thence approximately 1.9 miles to the Lateral C <br />Canal, thence approximately 1.0 miles to the Main Canal Class III fresh waters, (WBID# 3153A), thence <br />approximately 7.5 miles to the Indian River Lagoon at Vero Beach (Class III marine waters). The <br />discharge outfall for D-001 is a 24 -inch pipe that is approximately 5 feet in length, from the edge of <br />the canal's bank, and discharges at a depth of approximately 4 feet. <br />Tetra Tech, Inc. <br />201 E. Pine Street, Suite 1000, Orlando; FL 32801 <br />Tel 407.839.3955 Fax 407.839.3790 www.tetratech.com <br />122 <br />