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METHODOLOGY: <br />City of Eugene Systems Development Charges <br />~.) Appendix D <br />Wastewater System Charge Detail <br />1.0 Local Wastewater System <br />101 Local Wastewater SDC Formula Within the City, excluding the River Road/Santa <br />Clara/Highway 99 Area <br />Excluding the River Road/Santa Glara/Highway 99 Area identified in Attachment 2, the local <br />wastewater SDC is based on the replacement value of the wastewater collection system in <br />place on the date the rate is established plus all projects in the wastewater master plan <br />needed to serve the area inside the City's Urban Growth Boundary (UGB). The equivalent <br />.assessments and any state or federal grants are subtracted from this amount and the <br />remainder is divided by the total number of "equivalent dwelling units" (EDUs) which can be <br />accommodated within the UGB (both existing and projected). For a current estimate of local <br />wastewater system values to serve new development, including future projects and existing <br />reserve capacity (reimbursement) details, please see Table 4, section 5. <br />The impact of new development on the wastewater system is calculated in terms of equivalent <br />single family dwelling units (EDUs) or plumbing fixture units. The impact of an EDU was <br />estimated by determining the non-assessable cost of the future system within the urban <br />growth boundary allocated to ultimate residential development on the basis of sewage flow. <br />The State Drainage Plumbing Code is the basis for the calculation of the number of EDUs for <br />different types of development. For purposes of setting this rate, one EDU is equal to 16 <br />plumbing fixture units. Plumbing fixture units are defined in the Plumbing Code for each <br />plumbing fixture type. <br />The total cost of the existing system within the (UGB) listed in Table 4, section 1, is estimated <br />based on figures from the "Infrastructure Replacement Values Report" and the Wastewater <br />Master Plan prepared by the City's Public Works Department. Costs related to the River <br />Road/Santa Clara/Highway 99 Area portion of the system outside the City are excluded . The <br />cost of future projects within the urban growth boundary other than in the River Road/Santa <br />Clara/Highway 99 Area were taken from the Wastewater Master Plan. Future project costs <br />are listed in Table 4, sections 1 and 5. Assessable costs were estimated by calculating the <br />.cost of an 8" equivalent system as specified in the City Code. The non-assessable portion <br />of that cost. is estimated and listed in Table 4, section 4. Details on the calculation of the local <br />wastewater SDC are shown in Table 4 and the formulas are illustrated in Figure 4. <br />The total number of Single-family Units (SFU) is calculated by multiplying the ratio (percent) <br />of Single Family Dwelling Units (SFDU) by the number of Total Capacity Residential Units <br />(existing plus future). The total number of Residential Units is based on the system design <br />capacity for users within the (UGB). The total user flow. measured through the plant that is <br />attributable to single-family residential development (SFDU Attributable Flow) is determined <br />based on billable flow data from the regional sewage treatment plant. The system capacity <br />for the City's Wastewater collection system is converted to total EDUs, and is estimated by <br />dividing the number of SFUs, by the percent of SFD Attributable Flow. <br />May 1, 1997 City of Eugene SDC Methodology Page D-1 <br />