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<br />REVISED DRAFT <br /> <br />Excess Strength Charge <br /> <br />BOD <br /> <br />$0.65/lb above 250 my I <br /> <br />TSS <br /> <br />$0.34/1b above 250 mg/I <br /> <br />NH3 <br /> <br />$0.47/lb above 30 mg/I <br /> <br />Residential wastew~ter customers are currently billed on a maximum winter average, which <br /> <br />places a cap on the monthly wastewater volumes that are billed. The use of a maximum winter <br /> <br />average results in irregular monthly billings, placing increased risk on the City. To mitigate the <br /> <br />risk associated with the maximum winter average, the City should implement a flat winter <br /> <br />average for determining residential wastewater volumes. The flat winter average assumes that a <br /> <br />residential customer's monthly wastewater volumes on average will reflect the winter average, <br /> <br />that is, some months the residential customer will contribute more to the wastewater system and <br /> <br />some months will contribute less. However, the maximum winter average assumes that the <br /> <br />residential customer will not exceed the winter average. The proposed residential wastewater <br /> <br />rates were calculated using a flat winter average, assuming 625 cubic on average per residential <br /> <br />wastewater customer. <br /> <br />For wastewater service to customers who do not receive water service from the City, monthly <br /> <br />billings should be based upon consumption information obtained from the water supplier. If the <br /> <br />City experiences additional costs in obtaining the wastewater data, these costs should be included <br /> <br />in billing the wastewater customers. <br /> <br />CityalParis. Texas <br />Water and Wastewater Cast alService Study <br />March 2003 <br /> <br />31 <br />