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<br /> ., <br /> Page 3 <br /> The staff was requested to examine the current method for calculating e <br /> customer charges and identify alternative ways of billing for <br /> storm sewer expenses. <br /> It is proposed that the sanitary sewer portion continue to be charged to cust- <br /> omers on a flow basis. In other words, annual sanitary sewer costs of <br /> $2,542,880 be allocated over the 4,763,000,000 gallons of annual flow (on the <br /> basis of 54~/1000 gallons of flow). Single family residential customers would <br /> charged for 5800 gallons per month until July 1, 1986 when each residential <br /> customer would be billed on actual flows. <br /> The annual storm water costs of $2,145,562 should be charged on some basis <br /> that is more representative of the runoff from a specific customer1s property. <br /> Engineers typically calculate runoff with a formula using the area and a <br /> "runoff" factor. Data available from the April 1985 Neighborhood Analysis <br /> were used to estimate the relative share of runoff from land use categories. <br /> For example, the city contains 1920 acres of commercial property that sheds <br /> 70% of the rain falling upon its surface. Thi's constitutes 24.3% of the <br /> runoff water which the city must convey in pipes and ditches to points <br /> of disposal. Each land use category was examined to estimate its share <br /> of its total stormwater runoff. The results of that analysis are contained <br /> in the table below. Storm sewer expenses were then divided into <br /> $1,315,230 for non residential customers and 5830,332 for residential <br /> customers. <br /> TABLE 2 e <br /> RUNOFF CHARACTERISTICS FOR DIVIDING COST BETWEEN CUSTOMER GROUPS <br /> Land Use Area(1 ) Runoff (2) ~~ Respon- Cost <br /> Distribution (Acres) Factor sib i 1 ity Assiqn. <br /> NON-RESIDENTIAL <br /> Commerical 1920 0.70 24.3% <br /> Industrial 1460 0.70 18. 4~~ <br /> Public (3) 1870 0.20 6. 8~~ <br /> Multi-family (4) 1040 0.63 11. 8~'; <br /> Subtotal 6290 61. 3~b $1,315,230 <br /> RESIDENTIAL <br /> Single Family 6130 0.35 38. n~ $ 830,332 <br /> Composite 12,420 0.45 100. O~~ $2,145,562 <br /> (1) Ap~il 1985, Neighborhood Analysis Addendum, Eugene Planning Department. <br /> (2) Design manuals of the Water Pollution Control Federation and Kramer, Chin <br /> and Mayo. Inc., Consulting Engineers. e <br /> (3) Public land was grouped with IInon-residentialll because most water/sewer <br /> customers on public lands are classed as IIcommerical.1I <br />