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ATTACHMENT A INDIAN RIVER COUNTY DEPARTMENT OF UTILITY SERVICE WATER QUALITY STUDY AND POTABLE WATER TREATMENT FACILITY EVALUATION SCOPE OF SERVICES I. BACKGROUND The County operates two water treatment facilities to provide potable water service to its customers. The two plants have a combined capacity of 25.7 MGD and an average daily flow of approximately 12 MGD. The plants obtain raw water from the upper Floridan aquifer and treat it with nanofiltration. Pretreatment for the membranes includes addition of sulfuric acid and a scale inhibitor. The permeate is blended with raw water and chlorine is added for disinfection, fluoride is added for fluoridation and lime, carbon dioxide and sodium hydroxide are added for remineralization, pH and alkalinity control and calcium carbonate stability. The proposed study is intended to focus on finished water quality as it leaves the treatment facilities and water quality within the distribution system and how it may affect the metallic components of the customers plumbing systems. The study will also evaluate the operation of the existing treatment facilities in terms of efficiency and operation in accordance with industry standards and applicable regulations. Recommendations for modifications to the operations or water treatment processes to improve their efficiency, finished water quality or reduce corrosivity will be included in the final report. The professional services described herein will be performed in accordance with the Continuing Contract Agreement for Engineering Services, dated April 17, 2018, Amendment 1 between Indian River County and Tetra Tech, Inc. II. SCOPE OF WORK Task 1— Preliminary Work Tasks 1. Tetra Tech will arrange for and attend a project kickoff meeting to introduce team members, establish lines of communication, discuss project objectives and expectations and review data availability and collection. Tetra Tech will prepare and distribute minutes to all participants within a week of the meeting. 2. Tetra Tech will develop an initial data request of documents and information required to perform the study and evaluation. The data request will be prepared in preparation for the kickoff meeting so that it can be reviewed at the meeting. 3. Tetra Tech will set up a time and date to tour each of the two treatment facilities to familiarize themselves with the processes and operations of both facilities. It is anticipated that these tours will take place after a substantial portion of the requested data has been received so that questions about the data can be answered during the tour. BK/sl/IRCDUS Evaluation Tt # 200BP Toho 1- 08/31/22 NTETRATECH