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revenue due to reductions u..d e~~iois. <br />When calculating revenue requirements, the rate model also takes into account the effect <br />of interest income and billing write-offs on the amount of service charges revenue <br />collected over the year. Interest income is a source of revenue just like the service <br />charges. The more interest that the City earns, the less that it has to collect from service <br />charges to cover program costs. Billing write-offs are the amount of revenue that the <br />City does not collect because of non- or under-payment of bills. Revenue requirements <br />not collected due to billing write-offs must be collected from other customers to cover <br />program costs. <br />5.3.2 General Customer ESU Truncation <br />As explained above, general customers' ESUs are calculated by dividing their impervious <br />surface by 1000 and truncating the result. In effect, the number of general customer <br />ESUs used by the rate model is less than the true number of general customer ESUs <br />existing in Eugene. To maintain equality between customer elassesc a "e ,typical <br />residential ESUs are adjusted by the same factor as the decrease in the total number of <br />general customer ESUs. <br />5.3.3 Inactive Accounts <br />.The City is using Eugene Water and Electric Board (EWEB) to bill'the stormwater <br />service charges. When a tenant moves out of a house, apartment or commercial unit, the <br />owner of the building may request that the water and electric services be turned off. <br />EWEB considers this an inactive account and will not send out stormwater bills for that <br />property until the water and electric services are requested again. The stormwater rate. <br />. model adjusts for inactive accounts by~ reducing the billable impervious surface area. <br />based on EWEB account history. <br />6.0 Adjustments To A Customer.'s Fee <br />The stormwater service charge will be reduced if the customer shows to the City engineer's <br />satisfaction one or more of the following: <br />(1) The customer has permanently reduced their quantity discharge to the public system, <br />(2) The customer has a different number of ESUs than is calculated by the City, or <br />(3) The customer with a quality surcharge has permanently reduced their quality impact to <br />the public system. There are currently no quality surcharges imposed on stormwater <br />Stormwater Service Charge: Methodology Paper -Page 11 <br />Draft Revisions -April 10, 1995 <br />