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OTETRA TECH <br />July 27, 2020 <br />Vincent Burke, P.E. <br />Indian River County Department of Utility Services <br />1801 27th Street, <br />Vero Beach 32960-3388 <br />Email: vburke(dirc oe v.com <br />Subject: Proposal to Indian River County for <br />AST Closure and Site Assessment <br />375 82"d Avenue, Vero Beach, Florida <br />Dear Mr. Burke: <br />Tetra Tech, Inc. (Tetra Tech) is pleased to provide Indian River County Department of Utility Services (IRCDUS) <br />with this Scope of Work for services to provide Above Ground Storage Tank Closure and Site Assessment services <br />for the former Premier Citrus Property, located at 375 82"d Avenue, Vero Beach, Florida (the Site). <br />BACKGROUND <br />Indian River County needs additional storage of reuse water from the West Regional WWTF during the rainy season <br />when the necessity for reuse water is limited. The West Regional WWTF is sized for a treatment capacity of 6 <br />million gallons per day (MGD). The plant is currently operating at approximately 2 MGD but can only discharge <br />approximately 0.4 MGD or risk exceeding the load allocations into the relief canal. The remainder of the treated <br />water is sent back to the community for reuse. The goal of the proposed reclaimed water storage will be to provide <br />sufficient capacity to store water during the wet season and supply reuse water in the dry season and achieve a zero <br />discharge to the relief canal. <br />Tetra Tech assisted in the due diligence process, and the IRCDUS recently purchased the Site. The county has <br />identified an approximately 243 -acre parcel immediately to the south of the West Regional WWTF as a potential <br />site for the reclaimed water storage. It is zoned RS -3 and is a citrus grove. The County contacted Tetra Tech to <br />complete due diligence required to assess this potential project, zoning and permitting issues associated with project, <br />geotechnical conditions, limitations from Federal Aviation Administration (FAA) or other agencies, and other <br />business and environmental risks associated with the purchase of the proposed parcel. <br />The Phase I Environmental Site Assessment identified the following Recognized Environmental Conditions (RECs) <br />for the Site: <br />The potential for soil and groundwater impacts from current and former petroleum and/or pesticide and herbicide <br />ASTs, former underground storage tanks (USTs) storing petroleum and/or pesticides and herbicides, and application <br />of pesticides and herbicides, are potential RECs for the Site. <br />Tetra Tech recommended additional investigation for the Site, including investigation of potential asbestos <br />containing material (ACM), lead-based paint (LBP), and mold. Investigation is also recommended for potential for <br />soil and groundwater impact from the storage of petroleum and storage and application of pesticides and herbicides <br />across the Site, which are potential RECs for the Site. <br />Tetra Tech completed a Limited Phase II ESA and identified soil in exceedance of the Soil Cleanup Target level <br />(SCTL) and groundwater in exceedance of the Groundwater Cleanup Target Level (GCTL). <br />The Site has five artesian wells and one community water system well on Site. IRCDUS is currently in the process <br />of converting permits to IRCDUS from the previous owner. <br />Tetra Tech, Inc. <br />I I Riverside Drive, Suite 204, Cocoa, FL 32922 <br />Tel 321.636.6470 Fax 321.636.6473 wwwtetratechxom <br />