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