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Sewer Maintenauce <br />Since wastewater flows do not vary significantly except due to infiltration/inflow, which must be <br />shared Uy all customers of the systcm, allocation and distribution of all costs for wastewater <br />collection may be made among customer classes on the basis of average annual wastewater flow <br />contriUution to the system. All capital costs and operation and maintenance costs associated with <br />the wastewater collection system should be allocated on the basis of relative percentages of <br />wastewater flow during the test period. <br />Wastewater Treatment <br />Factors affectiiig wastewater treatment are different and many. Not only the volume of <br />wastewater connibution by a class of customer is relevant, but also the quality of the wastewater <br />is important. Treahnent facilitics must be designed to meet both the hydraulic loading and the <br />biochemical loading. Historically, the City's wastewater utility has measured wastewater <br />sh•ength in terms of three parameters: <br />a. BOD (Biological Oxygcn Demand) <br />b. TSS (Total SL►spended Solids) <br />c. Amnlonia (NH3) <br />Costs of operating and maintaining the treatment plant, therefore, must be allocated and <br />functionalized by these parameters, BOD, TSS and NH3, so that revenues may be collected from <br />the customer on the Uasis of not only quantity of wastewater, but also quality of the wastewater. <br />Lift Station <br />Lift stations are used to elevate waste along the wastewater collection system or into the <br />treatment plant. Sincc the costs associated with lift stations depend on the quantity of <br />wastewater and not the quality of wastewater, lift station costs were fiinctionalized to flow. <br />l Ciq, orPm-is, Tesas <br />Wmer mrd Wasteivraer CosI of 3ervice Srudp <br />Jmie ?0(0 <br />242 <br />