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Discussion Paper -- Jordan Lake Options for OWASA <br />December 18, 1998 <br />Page 3 <br />The intake structure could be located either onshore or offshore. An onshore structure would be served by <br />multiple underground pipes extending into the lake at different depths below the water surface <br />(Attachment 3). An offshore structure located in the lake would employ multiple intake gates at different <br />depths providing water back to shore through a single pipeline (Attachment 4). The preferred intake <br />configuration would be determined through additional engineering analysis. <br />A pumping station is needed to transport water from the intake system through approximately 15 miles of <br />transmission pipeline to OWASA's WTP. An additional booster pump station would be needed to <br />overcome friction losses and elevation changes between Jordan Lake and Carrboro. A potential pipeline <br />route is shown in Attachment 5. <br />How much will these facilities cost? <br />The cost figures provided are very preliminary and represent rough estimates only. <br />Facilities Cost <br />Water Intake System $2.0 million <br />Pumping Stations $5.9 million <br />Transmission Pipeline $18.6 million <br />Total $26.5 million <br />Assumptions <br />50 mgd intake structure with 1,000 feet of piping <br />50 mgd pumping station structure with 10 mgd <br />of installed capacity and a 10 mgd booster <br />pumping station <br />80,000 feet of 36 inch pipeline <br />What options are available to OWASA and Chatham County for collaborating on the <br />withdrawal and transmission of water from Jordan Lake? What are their <br />advantages and disadvantages? <br />There appear to be five basic options available for collaboration, but substantially more engineering work <br />will be needed to identify and develop the list of possible options: <br />Do not collaborate on any facility development at this time, but allow OWASA's property <br />to be used by Chatham County or others. <br />2. Collaborate on a joint intake system only. <br />3. Collaborate on an intake system and make a portion of OWASA's Jordan <br />Lake property available for Chatham County to use in pumping raw water to its <br />own treatment plant. <br />4. Collaborate on an intake system and pumping station at the lake. <br />5. Collaborate on an intake system, pumping station at the lake, and portions of the <br />transmission pipeline. <br />