Laserfiche WebLink
<br />DRAFT REPORT <br /> <br />Sewer Maintenance <br />Since wastewater flows do not vary significantly except due to infiltration/inflow, which must be <br />shared by all customers of the system, 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 />contribution 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 affecting wastewater treatment are different and many. Not only the volume of <br />wastewater contribution by a class of customer is relevant, but also the quality of the wastewater <br /> <br />.. <br /> <br />is important. Treatment facilities must be designed to meet both the hydraulic loading and the <br />biochemical loading. Historically, the City's wastewater utility has measured wastewater <br />strength in terms of three parameters: <br />a. BOD (Biological Oxygen Demand) <br />b. TSS (Total Suspended Solids) <br />c. Ammonia (NH3) <br /> <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 basis of not only quantity of wastewater, but also quality of the wastewater. <br /> <br />Lift Station <br />Lift stations are used to elevate waste along the wastewater collection system or into to the <br />treatment plant. Since the costs associated with lift stations depend on the quantity of <br />wastewater and not the quality of wastewater, lift station costs were functionalized to flow. <br /> <br />City of Paris, Texas <br />Water and Wastewater Cost of Service Study <br />May 2005 <br /> <br />19 <br />