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N ovember 2013 <br />MM # 1351 <br />SANITARY SEWER FEASIBILITY STUDY & REPORT <br />NORTH SEBASTIAN AREA <br />previously discharged directly into the Indian River Lagoon. The existing arterial sanitary sewer <br />system was originally designed to serve the residential and commercial development in Study Area <br />#1. The wastewater generated by Study Area #1 is ultimately conveyed to the Central Sub - <br />Regional Wastewater Treatment Plant which has adequate capacity for additional wastewater <br />flows. The groundwater direction of flow from Study Area #1 is from west to east into the Indian <br />River Lagoon. Therefore, there is no doubt that the construction of a centralized sewer system and <br />e limination of septic disposal systems will result in a significant reduction in the pollution load <br />presently experienced in the Indian River Lagoon. The centralized sanitary sewer system will be <br />constructed within the street system and with few exceptions; the streets in Study Area #1 are <br />paved and publicly owned. The final design of the centralized sewer system must take into <br />account the existing public potable water supply system, areas with existing storm sewer; and the <br />special construction limitations to be encountered along the eastern side of US Highway 1. <br />Study Area #1 contains a significant amount of existing and future commercial development as <br />shown on the `Commercial Area Map" in the appendix of this report. The commercial development <br />shown along US Highway 1, north of the Sebastian Cemetery is within Indian River County and the <br />commercial area shown south of the Cemetery is in the City of Sebastian. Presently, commercial <br />development is limited with regard to size and type by the use of onsite septic disposal systems. <br />The availability of a centralized sanitary sewer system will remove this obstacle to commercial <br />development and the resulting economic benefits. <br />Study Area #2 is residential in natureand substantially developed. The Ercildoune Heights <br />community has paved streets and is located on a high bluff overlooking the south shore of the St. <br />Sebastian River. The onsite septic disposal systems serving the residences of Ercildoune Heights <br />u ltimately percolate into the groundwater which flows into the St. Sebastian River. The <br />construction of a centralized sewer system for Ercildoune Heights and the elimination of the onsite <br />septic disposal systems will eliminate a significant pollution load into the St. Sebastian River. In <br />addition, the homeowners will not be subject to the inconvenience and expense due to septic <br />system failure and replacement reconstruction and/or malfunction. The other portion of Study Area <br />#2 is located north of Roseland Road between 128th Court and Kelso Place. This area is less <br />u rbanized and many of the streets are paved with a single lane of paving and several are unpaved. <br />The area could be described as an old established residential community served by on-site private <br />potable water wells and septic disposal systems. The existing street network is a grid system with <br />swale drainage. The construction of a centralized sanitary sewer system will eliminate the existing <br />pollution load from this community, which presently flows via groundwater into the St. Sebastian <br />River to the north. <br />2 <br />