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' TETRA TECH March 17, 2021 Scott Reynolds Indian River County Department of Utility Services 1801 27th Street, Vero Beach 32960-3388 Email: sreynolds4ircgov.com Subject: Proposal to Indian River County for Well Abandonment and Building Assessment (removed) Revl 3'75 .ams 82"d Avenue, Vero Beach, Florida Dear Mr. Reynolds: Tetra Tech, Inc. (Tetra Tech) is pleased to provide Indian River County Department of Utility 4 •Z(o'21 Services(IRCDUS)with this Scope of Work for services to provide Well abandonment and additional Site Assessment services for the former Premier Citrus Property, located at .3.7 82nd Avenue,Vero Beach, Florida(the Site). 31C BACKGROUND Indian River County needs additional storage of reuse water from the West Regional WWTF during the rainy season when the necessity for reuse water is limited. The West Regional WWTF is sized for a treatment capacity of 6 million gallons per day(MGD). The plant is currently operating at approximately 2 MGD but can only discharge approximately 0.4 MGD or exceed the load allocations into the relief canal. The remainder of the treated water is sent back to the community for reuse. The goal of the proposed reclaimed water storage will be to provide sufficient capacity to store water during the wet season and supply reuse water in the dry season and achieve a zero discharge to the relief canal. Tetra Tech assisted in the due diligence process, and the IRCDUS recently purchased the Site. The county has identified an approximately 250-acre parcel immediately to the south of the West Regional WWTF as a potential site for the reclaimed water storage. It is zoned RS-3 and is a citrus grove. The County contacted Tetra Tech to complete due diligence required to assess this potential project,zoning and permitting issues associated with project, geotechnical conditions, limitations from Federal Aviation Administration (FAA)or other agencies, and other business and environmental risks associated with the purchase of the proposed parcel. The Phase I Environmental Site Assessment identified the following Recognized environmental conditions (RECs) for the Site: The potential for soil and groundwater impacts from current and former petroleum and/or pesticide and herbicide ASTs, former underground storage tanks (USTs) storing petroleum and/or pesticides and herbicides, and application of pesticides and herbicides, are potential RECs for the Site. The ASTs have now been removed, and the petroleum issues on the site have been resolved. Tema Tech, Inc. Td rix