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INDIAN RIVER COUNTY, FLORIDA DEPARTMENT OF UTILITY SERVICES (2,(i•1. Date: April 2, 2018 To: Jason E. Brown, County Administrator From: Vincent Burke, P.E., Director of Utility Services Prepared By: Arjuna Weragoda, P.E., Capital Projects Manager Subject: Van Antwerp Properties Draft Well Mitigation Plan and Award of Bid #2018038 DESCRIPTIONS AND CONDITIONS: During the spring of 2012, the Indian River County Department of Utility Services (IRCDUS) conducted a full capacity test of the North County (Hobart) Reverse Osmosis (NCRO) Water Treatment Facility (WTF). Duringthat dry time of the year, the NCRO WTF was able to effectively test its raw water pumping abilities and reverse osmosis membrane filtration efficiencies. The Van Antwerps, adjacent property owners just west of the NCRO WTF, were affected by this functional test. The Van Antwerps, who historically relied on artesian flow from their wells for their water needs, reportedly lost artesian water flow during the pumping test. As a result, IRCDUS, as required by its Consumptive Use Permit (CUP), began efforts to mitigate this interference to the Van Antwerps, an existing legal user (ELU) of the Upper Floridan Aquifer (UFA). Such mitigation efforts continue today. On November 21, 2017, the Indian River County Board of County Commissioners (BCC) approved Work Order No. 16 with Kimley-Horn and Associates (KHA) for a lump sum amount of $44,608.00 to provide professional engineering services that included coordination and meetings, specifications and drawings, permitting, observation, and startup of a long-term mitigation solution for the Van Antwerp (VA) properties along 81St Street, just west of the NCRO WTF and east of 66th Avenue. IRCDUS owns and operates two regional potable water treatment facilities. The NCRO WTF is rated for 11.44 million gallons per day (MGD). Today, the NCRO WTF operates a rotation of three to four membrane skids (out of eight), fed from five raw water wells (out of nine), to meet daily potable water demands. As more people move to Indian River County, future hypothetical withdrawals may result in additional drawdowns on the UFA. The draft mitigation plan (Attachment 3) that is presented for BCC approval provides a "future proof' plan for the VA properties owned by Mr. and Mrs. Van Antwerp. The VA properties in total have five wells that were installed as far back as 1925 and as recently as 2005. The VA properties are made up of six parcels ranging from 0.86 to 9.0 acres for a total of approximately 28.93 acres. Currently, the three homestead structures and a packing house are served by County potable water. See Exhibit A (Attachment 1), which depicts the VA properties and well locations. ANALYSIS: As part of the NCRO WTF expansion in 2011, six new UFA wells were installed in the NCRO wellfield for a total of nine source wells. The St. Johns River Water Management District (SJRWMD) Consumptive Use Permit (CUP) 10524-9 was issued to IRCDUS in 2011 and expires in 2031. As part of the CUP, two conditions related to the subject matter are presented: 151 Page 1 of 7 C:\Users\legistar\AppData\Local\Temp\BCL Technologies\easyPDF 8\@BCL@ACODF439\@BCL@ACODF439.docx