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Comprehensive Plan Sanitary Sewer Sub -Element was renewed in 2012. That agreement is for an initial term of 15 years. Unless Indian River Shores provides notice of its desire to renegotiate or terminate four years before the expiration of that 15 year period, the agreement will automatically renew for another 15 years. Currently, the Indian River County water and waste water service area is comprised of the following: Majority of unincorporated Indian River County City of Sebastian Town of Orchid System Evaluation and Maintenance The sanitary sewer collection system is evaluated with each application for new development, and as each package treatment plant is decommissioned. That evaluation is done using a computer modeling program, known as the "WaterCad" model that evaluates several factors, including pipe capacity, lift station capacity, horse power requirements for pumps, and hydraulic pump pressure. In contrast to the City of Vero Beach, which is largely built -out and has provided utility service for many decades, sewer service is still relatively new to the rapidly growing unincorporated county. Consequently, the county's collection system is constantly evaluated. Within the county's service area, the major collection system problem is low velocity in force mains. In particular, the 24 inch, 20 inch, and 12 inch force mains in the US 1 corridor have low velocities even at peak flows. The low velocity is caused by oversized lines and a lack of wastewater generated. Where the velocity is less than 2 feet/second, solids will settle in pipelines. Settled solids decrease hydraulic capacity. Another problem occurs when a mass of accumulated solids become "unsettled" and reaches a treatment plant in an unexpectedly large concentration. In the past, this situation has resulted in sewage spills. While increased pipeline maintenance is necessary to prevent a reoccurrence of such spills, the recent installation of numerous automatic air release valves has corrected the problem by relieving gases that were preventing the normal flow of sewage through influent pipes. In the future, the county's policy should be to continue to install automatic air release valves in all new lines. Service to New Development Through the Utilities Department Wastewater Master Plan, the county has identified main lines that must be installed along major corridors. Unlike other collection lines, "Master Plan" lines usually do not connect directly to a wastewater generator. While master plan lines are paid for by the Utilities Department with revenue from capacity charges and other sources, non -master plan lines are paid from other sources. Community Development Department Indian River County 27 AttacRent 4