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VII. REVIEW OF WASTEWATER SYSTEM DATA <br />A. Review of Histo►•ical Wasteivatei• Data <br />To determine a comparison of wastewater producfion to watei• consumption by the City's water <br />utility customers, available test year data was analyzed for the puipose of this study. From the <br />test year residential water consumption, water-only (customers with sprinkler meters and septic <br />tanlcs) consuniption was removed. <br />Commercial contribution to the wastewater system is estimated from the commercial and retail <br />iiidustrial water consLunption after eliminating the consumption of the water-only accounts. <br />Since the commercial and industrial water consumption exhibits minimal seasonal variation, it is <br />assumed 100 percent of tlie water conswnption of these customers is contributed to the <br />Nvastewater system. <br />B. Dete►•inii►ation of Custotner Classes <br />The City has a special contract with Sara Lee with respect to wastewater discharge. Sara Lee's <br />wastewater rate is not based on the total cost of service for the wastewater utility since Sara Lee <br />contributed up-front capital to reserve a certain capacity in the wastewater treatment plant for <br />futurc usc. In order to recognize Sara Lee's conhact with regard to the cost of seivice and rate <br />design study, Sara Lee's wastewater volumes were removed from the rate calculation and their <br />i•evenues were recogilized as revenue offsets. These adjustments help to prevent an overestimate <br />of wastewater billing units aiid an underestimate of revenues. <br />For the purpose of distriUuting the total revenue requirement for the system, the wastewater <br />utilit~, customers are divided into two classes: Residential and Commercial. Residential and <br />Commercial customeis are assumed to discharge wastewater of nornial system strength. Any <br />metered commercial custorner that discharges wastewater of strength greater than the criteria set <br />for residcntia] and conmlcrcial customers pays for the added cost of treatment required. <br />15 Cir), ojYarrs, Teaas <br />l1lnter mid FVnsreirnler Cosr ofService Sn(d), <br />June 2010 <br />