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.. <br />' Attachment #4 of Exhibit A <br />Administrative Order No. 58-96-06 <br />Page 1 of 5 <br />Based on billable flow data from the regional sewage treatment plant, it was determined <br />that approximately 47 percent of the total user flow through the plant. is attributable to <br />single-family residential development. It is estimated that a total of 90,000 residential <br />units (existing plus future) can be accommodated within the urban growth boundary. Of <br />this amount, approximately 64 percent (57,600) are estimated to be single-family units. <br />Based on these factors, the estimated capacity of the city's sanitary sewer system is <br />122,553 EDUs (57,600 DUs/47 percent of user flow). Dividing the non-assessable costs <br />by the system. capacity yields a sanitary charge of $473.61 per EDU or $29.60 per <br />plumbing fixture. unit. <br />1.1.1 Rates For New Development <br />1.1.1.1 Single Family Dwellings 8~ Duplez. <br />For all new single family dwellings the local wastewater charge is the <br />rate. for one. EDU. For all new duplex development, the charge is equal <br />to two times the rate for one EDU: <br />'~-__ 1.1.1.2 All other development with wastewater discharge less <br />than 100,000 gallons per day <br />For all other new development with measured or proposed total flow less <br />than 100,000. gallons of water discharged. per day, the local wastewater <br />charge is the rate per plumbing fixture unit (PFU) multiplied by the <br />number of plumbing fixture units in the proposed development. This is <br />based on an assumed typical single family dwelling having 16 PFUs. <br />1.1.1.3 Large Volume Users,:-with. wastewater discharge greater <br />than 100,000 gallons per day <br />For. new development with measured or proposed total flow greater than <br />100,000 gallons of water discharged per day, the local wastewater <br />charge is et~ual to the total amount of water being discharged per day <br />(Total Flow), divided by the presumed continuous EDU flow estimate, <br />multiplied by the rate for one EDU. <br />The presumed continuous EDU flow estimate (average gallons per day) <br />represents the assumed daily flow of a typical EDU, if continuous <br />consumption were to occur over a 24 hour period. The presumed <br />continuous flow measure is estimated as 600 gallons per day. <br />.July 01, 199fi ~ Methodologies: City of Eugene Page D-4 <br />__ <br />