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Sewer Nlaiutenaucc <br />Since wastewater flows do not vaiy significantly except due to inCltratioi-L/inflow, which must be <br />shared by all customers of flie system, allocation aud distribution of all costs for wastewater <br />collection may be made among customer classes on the basis of average aimual wastewater flow <br />contribution to the system. All capital costs and operation and maintenance costs associated with <br />the wastewater collection system should Ue allocated on the basis of relative percentages of <br />wastewater flow during thc tcst period. <br />Wastewater Treatment <br />Factors affecting wastewater treatment are different and many. Not only the volume of <br />wastewater contribution Uy a class of customer is relevanl, but also the quality of dle wastewater <br />is important. Treatment facilities must be designed to meet bot11 the hydraulic ]oading and the <br />biochemical loading. Historically, the City's wastewater utility has â–ºneasured wastewater <br />strength in tcrms of tliree parameters: <br />a. BOD (Biological Oxygen Demand) <br />b. TSS (Total Suspended Solids) <br />c. Amnlonia (NH3) <br />Costs of operating and n7aintaining the treatment plant, therefore, must be allocated and <br />fiuictionalized by these parameters, BOD, TSS and NH3, so that revenues may be collected from <br />the custonier oii the basis 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 plailt. Siiice the costs associated with lift stations depcnd on the quantity of <br />wastewater and not the quality of wastewater, lift station costs were fiinctionalized to flow. <br />17 Cin, ofPa,9s, Tesas <br />Wnler nnd IVnstewruer Cost oJService Snid>> <br />June 2010 <br />