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SECTION 3 Wastewater Impact Fee Calculation This section presents the calculation of proposed wastewater impact fees for Indian River County.The wastewater impact fees were calculated by determining the capital investment in the wastewater system by major system component(i.e.,treatment,transmission,effluent disposal,and sludge management).The investment in each system component was divided by the capacity of those system components to derive a unit investment per mgd of capacity for those components.The summation of the unit investment for the system components results in the total capital investment per mgd of capacity in the system.This capital invest- ment per mgd of capacity was then adjusted for future principal payments and interest carrying charges to derive the net unit investment per mgd of capacity.The 5-year average net investment per mgd of capacity is then the proposed wastewater impact fee. 3.1 Unit Capital Investment The unit capital investment calculations for the wastewater system were developed for the wastewater transmission,treatment,effluent disposal,and sludge management systems separately.The capital investment in the wastewater treatment facilities includes only the most recent increments of treatment capacity added at each facility and planned expansions during the study period(FY 1997 through FY 2001).The capital investment calculations for the other system components(transmission,effluent disposal,and sludge management) include all current and planned capital improvements through buildout(Year 2010). 3.1.1 Wastewater Treatment Facilities The County's wastewater treatment facilities include the West Regional,Central,North County,South County,and Sea Oaks wastewater treatment plants.(WWTPs).The County has expanded the West Regional,Central,North County,and South County WWTPs within the last 5 years.An expansion of the Sea Oaks WWTP is scheduled for FY 2001.The recent expansions at these facilities have added 5.4 mgd of capacity to the System,at a capital cost of$13.2 million.As shown in Exhibit 3-1,the weighted average unit cost of the system's entire wastewater capacity is$3.0 million per mgd. 3.1.2 Wastewater Transmission Facilities The County's investment in the wastewater transmission system currently amounts to approximately$21.3 million.Planned improvements to the transmission system could raise the total investment in the system by$16.4 million to$37.7 million by the year 2010.At buildout,the system is estimated to have a capacity of 13.5 mgd.The unit cost per mgd of capacity in the wastewater transmission system ranges from$3.0 to$3.2 million during the study period.The calculation of the unit cost of capacity in the wastewater transmission facilities is shown in Exhibit 3-2. DF8f12074.D0C 3-1