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41 <br />Attachment F <br />OWASA ORANGE WATER AND SEWER AUTHORITY <br />Quality Service Since 1977 <br />MEMORANDUM <br />TO: J.B. Culpepper <br />FROM: Ed Holland <br />DATE: February S, 2011 <br />SUBJECT: Updated Concept Plan and Cost Estimates for Providing Public Sewer <br />Service to the Town of Chapel Hill's Rogers Road Small Area Plan <br />Study Area <br />Background and Overview <br />This memorandum and attachments are intended to update and supersede the information <br />we provided in a June 22, 2007 memo to Mr. Gordon Sutherland regarding preliminary <br />concept plans and cost estimates for extending OWASA sewer service to properties <br />within the Town's Rogers Road Small Area Planning Area. We hope this information <br />will help inform ongoing discussions about implementing the proposed Rogers Road <br />Small Area Plan. Please note several items: <br />• Virtually all existing parcels in the Town's Rogers Road study area already have <br />access to OWASA water lines; therefore, this exercise is focused on sewer service <br />only. <br />The concept plan represents a gravity flo-yv sewer configuration.. It incorporates no <br />sewage pumping stations, which OWASA approves only in unusual circumstances <br />where it is not viable to serve properties by gravity. It continues to be OWASA's <br />experience that wastewater pumping stations are expensive to maintain and less <br />reliable over the long term than gravity collection, due to the greater risk of <br />mechanical failure and resulting sewage spills. <br />Our previous (June 2007) work included three separate concept scenarios for serving <br />separate portions of the Rogers Road study area. Thanks to the completion of one or <br />more development projects since that time (e.g., Habitat for Humanity's Phoenix <br />Place Development) and the submission of one or more development proposals with <br />substantial engineering detail (e.g., St. Paul's AME Church), this current update <br />comprises only a single concept scenario. <br />• This concept and cost estimates focus solely on providing sewer service to the <br />specific area delineated by Chapel Hill's Rogers Road Small Area planning <br />