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1 within the existing easement area along the back lot lines in each block. Each of the 375 dwelling units is also served by individual on-site septic systems consisting of conventional septic tanks and ' effluent disposal fields. The existing septic systems do not function properly specifically ' with respect to wastewater disposal, since the layer of hard limestone prevents effective percolation of the septic tank effluent. This creates ' an unhealthy and environmentally unsound situation in addition to a major inconvenience to the residents of the Rockridge service area in the form of frequent sewage backups into their home's plumbing systems. ' The Commissioners of Indian River County, as well as the homeowners of the Rockridge service area, have concluded that there is a high ' priority need for resolving the sewage problem in Rockridge by construc- tion of a sewage collection and conveyance system which is permanent ' and cost-effective. The first step, in order to satisfy that need, is the preparation of this Engineering Feasibility Study and Report. ' Existing Sewage Facilities ' One major advantage of the Rockridge project area location is its close proximity to the existing Vero Beach wastewater treatment facility. Other existing sewage facilities in the vicinity of the project area include an 18" concrete force main constructed along the ' south side of 18th Street and a 6" PVC force main constructed along the west side of 6th Avenue and the south side of 16th Street. Of course, both of these force mains are conveying sewage to the existing Vero Beach wastewater treatment plant. Also, Fairlane Harbor is located east of the Rockridge project area and south of the Vero Beach wastewater treatment plant. Fairlane Harbor is provided with a sanitary sewer collection system consisting of conventional manholes and 8" gravity ' sewer, and an existing pump station on the westerly edge of the project which conveys the sewage via a 3" force main to the Vero Beach plant. This gravity collection system was, no doubt, constructed as part of ' the original subdivision improvements when the ground was totally vacant. The gravity collection system is installed in the street rights-of- way and was, probably, in place and ready for service before the streets -2-