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7 <br /> OWASA Rainwater Harvesting Systems Requirements and Charges <br /> September 7,2007 <br /> (2) a table showing the plumbing fixture unit values or applicable use volumes <br /> per unit of use for each of the plumbing fixtures discharging to OWASA <br /> Sanitary Sewer System; <br /> (3) a calculation of the anticipated daily use of each plumbing fixture; and <br /> (4) a calculation of the estimated daily and monthly wastewater volume that <br /> will be discharged by these plumbing units. <br /> Once this information has been received, OWASA will determine the flat rate that <br /> will be applicable to the estimated sewer discharge for the facility. <br /> 2. Sewer Charges Applicable to Metered Discharges From Rainwater <br /> Harvesting Systems: At the builder/owner/customer's request, or as otherwise <br /> determined necessary and required by OWASA, the customer shall at their <br /> expense install a special flow measurement system to accurately determine the <br /> volume of wastewater that is actually discharged to the OWASA Sanitary Sewer <br /> System as a result of a rainwater harvesting system or other non-potable water <br /> supply system. Such a measurement system would not include the volume of <br /> water used for irrigation/outside uses that do not result in a discharge to the <br /> OWASA Sanitary Sewer System. Under this alternative method: <br /> (1) The meter or flow measurement system would have to be designed and built <br /> according to OWASA standards, be accessible to OWASA meter reading <br /> and maintenance personnel, and have a remote meter readout installed in an <br /> accessible location. OWASA will own and maintain the meter installed for <br /> this purpose. <br /> (2) OWASA would bill the customer for the actual measured volume of sewer <br /> discharge, as well as a fixed monthly service charge for billing the customer <br /> and maintaining the sewer-only meter or flow measurement system. This <br /> would provide for an accurate measurement of the discharge to the sewer <br /> system, and cover OWASA's full costs of reading and maintaining the <br /> sewer-only meter as well as collecting and treating the wastewater <br /> discharge. <br /> In general, to reduce total costs to the customer and provide for ease of <br /> administration, OWASA's preferred approach will be to base the applicable sewer <br /> charges on the estimated volume of wastewater discharge. However, metering of the <br /> actual sewer discharge may be necessary for large volume systems. <br /> 3 <br />