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November 2013 MMfi1351 SANITARY SEWER FEASIBILITY STUDY & REPORT NORTH SEBASTIAN AREA Area #1 north of Jackson Street in the North Central Avenue corridor can be served by gravity sewer connected to the existing sewer system without the need for any new pumping stations. The maximum depth of the proposed sewer system in the North Central Avenue corridor, north of Jackson Street is approximately 9 -feet below grade. A separate small gravity sewer system is shown from Jackson Street south along North Central Avenue with a small pumping station proposed at the intersection of North Central Avenue and Davis Street. Also, several proposed manholes and a small section of gravity sewer is shown on Exhibit 1B to be constructed on property owned by the City of Sebastian. The gravity sewer will connect and flow into a pumping station next to the fish market building owned by the City of Sebastian. This proposed gravity sewer will serve three (3) properties fronting on US #1. Three (3) soil borings were taken along North Central Avenue designated as SB -7, SB -8, and SB- 9. These soil borings are included in the Appendix of this report and show a high seasonal groundwater table approximately 24 -inches below the surface. The presence of this high groundwater table along North Central Avenue will necessitate a dewatering operation as part of the construction of the proposed gravity sewer in North Central Avenue. The need for dewatering will increase the time and construction cost of the gravity sewer system in the North Central Avenue corridor, south of Roseland Road. Lastly, a proposed gravity sewer system in Study Area #1 is shown north of Roseland Road to serve the residential users along Ruffner Lane and Bay Street. A manhole and small section of gravity sewer is shown north of Bay Street to serve the commercial complex including Bay Street Pharmacy along with the Monett Eye Center to the north. This manhole and section of gravity sewer would be constructed in an easement. This would avoid the costly construction of additional gravity sewer along the east side of US #1 and will serve the Monett Eye Center. The proposed gravity sewer system in Bay Street flows by gravity into the existing sanitary system in Indian River Drive as shown on Exhibit 1A. In summary, it is feasible to serve Study Area #1 with a gravity sewer system and two (2) small pumping stations The fact that a high groundwater table exists along North Central Avenue will add to the time of construction and cost of construction due to the need for dewatering operations. It should also be noted that the presence of this high groundwater table means that many of the existing septic systems along North Central Avenue are located in the groundwater and are disposing of polluted water directly into the groundwater, which transports this pollution Toad into the Indian River Lagoon. 7