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7J INDIAN RIVER COUNTY, FLORIDA DEPARTMENT OF UTILITY SERVICES Date: February 24, 2015 To: Joseph A. Baird, County Administrator From: Vincent Burke, P.E., Director of Utility Servicesl` , Prepared By: Arjuna Weragoda, P.E., Capital Projects Manager Aw Subject: Work Order No.1 with Kimley Horn and Associates for Water Distribution System Water Quality and Corrosion Coupon Investigation DESCRIPTIONS AND CONDITIONS: On July 17th, 2012, the Indian River County Board of County Commissioners (BCC) approved Work Order No. 3 with Kimley-Horn and Associates, to provide professional services to design and implement a lime softening and carbon dioxide injection system at both water treatment plants. On May 7th, 2013 the Indian River County Board of County Commissioners (BCC) awarded the contract for the Water Plants Lime Slurry Injection Project to R.J. Sullivan Corporation. The construction is complete and the BCC approved the final pay to R.J. Sullivan Corporation on December 2nd, 2014. This highly sophisticated water stabilization system incorporates a lime slurry solution and carbon dioxide into the finished water in order to increase hardness and alkalinity of the drinking water. This system was installed as a replacement to the zinc orthophosphate corrosion inhibitor system and is intended to improve the scaling potential and reduce the corrosivity of the membrane treated finish water. The County intends to conduct specific testing of the distribution system to validate the effectiveness of the water stabilization system. The testing will be conducted through corrosion monitoring via coupons. Corrosion coupons are the simplest and most commonly used form of corrosion measurement today. Corrosion coupons are small bars of various metals or alloys that are introduced into the system through a side stream coupon rack. ANALYSIS: Staff requested that Kimley-Horn prepare a proposal to evaluate the stability of the water within the distribution system via coupon testing. The scope of the evaluation is more specifically described in the attached Work Order No.1. On November 4th, 2014, the Indian River County Board of County Commissioners approved the Extension and Amendment of the Continuing Contract Agreement for Professional Services with Kimley-Horn and Associates. The total negotiated cost for the Water Distribution System Water Quality and Corrosion Coupon Investigation is a lump sum amount of $32,900.00. Consultant will prepare up to four copies of a corrosion study technical memorandum summarizing the results of both phases of the 120 day investigation and characterizing the potential 75