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November 2013 MM # 1351 SANITARY SEWER FEASIBILITY STUDY & REPORT NORTH SEBASTIAN AREA It is interesting to note that Indian River County Utilities Department has a vacuum collection system in operation serving the community of Rockridge with approximately 400 residential customers connected to the system. The Rockridge vacuum collection system was constructed in 2008 to replace a low-pressure pump system which failed to operate during hurricanes and any other occasions when electric power failed. The Rockridge vacuum collection system has operated satisfactorily since start-up and has not been adversely impacted by occasional flooding of the area and periodic electrical power failures. The Mastelier & Moler, Inc. staff has visited the Rockridge vacuum collection system installation and several photographs of the Rockridge system are included in the Appendix of this report. Study Area #1 Study Area #1 using a vacuum collection system for the North Central Avenue corridor is shown in Exhibits 3A and 3B. The existing sanitary sewer system is shown in green and the proposed vacuum collection system is shown in heavy solid green lines and solid orange lines. The central vacuum station is shown in purple and the proposed force main is shown as a solid purple line. Study Area #1 has a north / south sand ridge along the east side of US #1. The result is the commercial users along the east side of US#1 must be served by a separate sewer system. Based on meetings with representatives of the F.D.O.T. concerning the location of a sewer system in the US #1 right-of-way it was the position of the F.D.O.T. staff that no structures would be approved within the US #1 right-of-way, but sewer pipe and manholes would be permitted. Since the valve pits associated with the vacuum collection system may be considered a structure by F.D.O.T., Exhibits 3A and 3B show conventional gravity sewer being proposed for serving the commercial users along the east side of US #1. In addition, a small area north of Roseland Road consisting of residences along Ruffner Lane and users along Bay Street will served by a conventional gravity sewer system as shown on Exhibit 3A. The portion of Study Area #1 where the vacuum collection sewer system should be given serious consideration is the North Central Avenue corridor from Roseland Road south to the intersection of North Central Avenue and US #1. Since the groundwater table is high along North Central Avenue, the shallow depth of the vacuum sewer mains will result in a substantial reduction in construction cost of the pipelines and associated dewatering expenses. Also, the absence of manholes and the sealed pipeline system associated with the vacuum collection sewer system will result in the elimination of in -flow and infiltration which reduces future operation and maintenance expense. Exhibits 3A and 3B show the conceptual design of the vacuum system consisting of 4- 12