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PROJECT UNDERSTANDING In 2014, Indian River County Utilities (IRCU) authorized Kimley-Horn to perform the first phase of developing a new water distribution system hydraulic model to reflect IRCU's current GIS (Geographical Information System) data and better represent their existing water distribution system configuration. As part of this work, Kimley-Horn developed a representative water distribution model of IRCU's service area based on IRCU's GIS data at that time. The next phase includes calibration and further development of the model for existing conditions. This consists of: • Collecting field pressure recordings and flow testing data using existing hydrants • Hydraulic system calibration • Developing and running extended period simulations with the remote storage tanks, North Beach Repump, and the ground storage tanks at South Oslo • Better defining existing operation of remote elevated storage tanks and high service pumps (i.e. drain and fill versus keeping full) • Evaluating the system's ability to achieve the PBS&J recommended ISO fire flow requirements • Providing recommendations for future storage tank operations and infrastructure improvements. • Identifying areas of low pressure and/or areas with potentially closed valves • Defining residence times within the distribution system including at Total Trihalomethanes (TTHMs) and Haloacetic acids five (HAAS) sites • Identifying critical valves within the system • Developing limited unidirectional flushing (UDF) maps to address pockets of poor water quality Consultant will update the model to account for infrastructure and operational changes that have occurred since the model was developed in 2014; this consists of updating the model for recent developments, water demands, infrastructure improvements and water plant operations. Based on this understanding, the following tasks will be performed by the Consultant. 47