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City of Orono Project No: 000139-10047-0 Old Crystal Bay Road Reconstruction Page 6 CITY OF ORONO – OLD CRYSTAL BAY ROAD RECONSTRUCTION 3.0 Sanitary Sewer Improvements The existing gravity sanitary sewer was installed in approximately 1962 and runs along the east side of Old Crystal Bay Road from Old Highway 12 to approximately 1300’ north of Old Highway 12. The sewer is 8 inches in diameter and constructed of vitrified clay pipe. Three forcemains connect to the existing gravity sewer at the north end of the system. All flows are routed to the south and connect to the sanitary sewer at Old Highway 12. In August, 2010, the City televised the existing sanitary sewer in Old Crystal Bay Road. The televising video and associated report revealed several concerns with the existing sewer, including mineral deposits and infiltration. The proposed sanitary sewer improvements are shown in Figure 2. The proposed improvements include completely replacing the existing gravity sewer north of Old Highway 12. We are recommending sewer replacement based on the age, typical life expectancy, and existing condition of the system. All sanitary sewer services will also be replaced between the main and the right-of-way line. There are two small diameter pressure sewers on the west side of Old Crystal Bay Road on the northern end of the project. A two-inch HDPE pressure sewer serves the Jamestown Road neighborhood and was installed in 2005. It runs along Old Crystal Bay Road from CSAH 6 to the existing gravity sewer manhole approximately 1600 feet south of CSAH 6. In addition, a two-inch HDPE forcemain carries flows from a lift station at the Orono Ice Arena to this same manhole. It was installed in 1997. There have been no known issues with either of these systems. Therefore, given the relative age and condition, it is not recommended to replace these pressure sewer pipes as part of this project. Cost estimates for the proposed sanitary sewer improvements are presented in the Appendix. 3.1 ADDITIONAL IMPROVEMENT OPTIONS Described below are two additional sanitary sewer improvement options that may be included as part of this project. The proposed improvements are shown in Figure 2. The City should determine which of the options, if any, it would like to be included in the project. A cost summary of each of these items is included in Section 7.0 (Cost Analysis). Cost estimates for each of these additional improvement options are provided in the Appendix. A. MEDINA FORCEMAIN REPLACEMENT In 1981, a four-inch forcemain was constructed to serve the Morningside Addition in Medina, just north of CSAH 6. The pipe material is not known, although it is likely ductile iron pipe. The forcemain runs west along CSAH 6 to Old Crystal Bay Road. It then runs along the east side of Old Crystal Bay Road to a gravity manhole approximately 1600 feet south of CSAH 6. Given the age of this forcemain and its location under the proposed road, we recommend the segment located along Old Crystal Bay Road be replaced as part of this project. Item #10 - CC Agenda - 10/25/2010 Old Crystal Bay Road Reconstruction Feasability Study [Page 9 of 42]