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Exhibit B <br />Cost Detail <br />Work Order No. 10 <br />NX AtkinsRealis <br />INDIAN RIVER COUNTY <br />DEPARTMENT OF UTILITIES SERVICES <br />CITY OF SEBASTIAN BUILDOUT OF <br />SEPTIC TO SEWER CONVERSION <br />FEASIBILITY STUDY <br />IRCDUS PID 21.26.502 <br />OCTOBER 15, 2025 <br />EXHIBIT A - SCOPE OF SERVICES <br />BACKGROUND <br />Over the past decade, public awareness of the need to improve the water quality of the Indian <br />River Basin has grown significantly. This has led to increasing regulatory pressure on utilities to <br />reduce pollution and improve the quality of discharges into the Lagoon. One major initiative is the <br />recently established Indian River Lagoon Protection Program (Florida State Statute 373.469). <br />Under this statute, all existing conventional septic systems in the Indian River Lagoon Basin are <br />required to either connect to sewer systems or upgrade to enhanced nutrient -reducing onsite <br />sewage treatment and disposal systems by July 1, 2030. <br />Fortunately, Indian River County Department of Utilities Services (IRCDUS) has been ahead of <br />the curve in proactively expanding sewer collection systems throughout their service area, <br />including customers currently relying on onsite sewage treatment and disposal (septic) systems. <br />In September 2025, IRCDUS engaged AtkinsRealis to provide technical services for their current <br />phase of septic to sewer conversions in the City of Sebastian. <br />Septic to sewer conversions are necessary to limit the amount of nutrients, particularly nitrogen <br />and phosphorus, released into the ground by septic systems, which can contaminate groundwater <br />and nearby water bodies. In areas with porous soil, septic systems often fail to adequately filter <br />these nutrients, leading to environmental issues such as harmful algal blooms and health risks <br />from polluted drinking water. The proposed sewer systems, by contrast, will transport wastewater <br />to a centralized treatment plant that more effectively removes nutrients, protecting ecosystems <br />and public health while offering greater resilience during storms and floods <br />To support this effort, a comprehensive study will be conducted to evaluate whether the existing <br />infrastructure including lift stations, gravity sewers, and force mains can accommodate the <br />increased wastewater flow resulting from the transitions. <br />City of Sebastian Buildout of Septic to Sewer Conversion <br />Feasibility Study <br />Page 2 of 12 <br />