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City of Orono Project No: 000139-10047-0 <br />Old Crystal Bay Road Reconstruction Page 7 <br />B. OLD HIGHWAY 12 SEWER REPLACEMENT <br />This existing gravity sewer segment was installed in approximately 1962 and runs along the south side of <br />Old Highway 12 from Old Crystal Bay Road to the Orono/Long Lake municipal boundary, approximately <br />1500’ east of Old Crystal Bay Road. The sewer is 8 inches in diameter and constructed of truss pipe. <br />The sewer is currently undersized for the planned future service area. In addition, the pipe is in poor <br />condition. The televising report completed in August 2010 identified several locations where the pipe is <br />cracked, as well as several areas where the inner layer of the pipe has separated from the outer layer. <br />Therefore, we recommend that this segment of sanitary sewer be replaced as part of this project. Given <br />the close proximity of the sanitary sewer to the existing roadway, as well as to the existing Metropolitan <br />Council forcemain and other private utilities, we recommend utilizing pipe bursting, a trenchless <br />technology, to replace the sanitary sewer. All sanitary sewer services will also be replaced between the <br />main and the right-of-way line. <br />Constructing the additional sanitary sewer improvements A and B as part of the larger street and utility <br />project will likely be more efficient and cost-effective than completing them as stand-alone projects. It <br />should also be noted that the additional improvement options A and B are covered in the 1981 Sanitary <br />Sewer Construction and Service Agreement between Orono, Medina, and Long Lake. The City of Medina <br />should be contacted to discuss the cost sharing responsibilities identified in the agreement. <br />Item #10 - CC Agenda - 10/25/2010 <br />Old Crystal Bay Road Reconstruction Feasability Study [Page 10 of 42]