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1 <br />' <br />were paved and houses constructed in Fairlane Harbor. <br />of this study and report, it is assumed that <br />For the purposes <br />' <br />once the wastewater has been collected from the Rockridge project service <br />be possible to pump the collected wastewater into the <br />area, it will <br />existing 18" and 6" force mains for the continued conveyance of the <br />' <br />wastewater to the Vero Beach wastewater treatment facility. It should <br />recognized that future refinements of the selected collection system <br />' <br />be <br />alternative, together with subsequent negotiations with the City of <br />Vero Beach, may alter this assumption. <br />Viable Alternatives <br />' <br />that the existing 375 dwelling units within <br />There is no question <br />the Rockridge service area would have had sewer service long before <br />now were it not for the soil conditions which exist within the project <br />site. As indicated before, the soil boring study and report, which <br />is contained in the appendix of this report, shows that the entire <br />project service area rests on a 1 to 2 foot thick layer of hard limestone <br />is, 1 to 3 feet beneath the ground surface. Under <br />' <br />which generally, <br />the hard limestone is a high ground water table which is within 3 feet <br />of the ground surface. There is no question why the existing water <br />distribution system is constructed with the small pipes resting on <br />top of the hard limestone layer. <br />' <br />The first alternative to consider is to construct a conventional <br />gravity collection system consisting of manholes and 8" gravity sewer <br />' <br />along with a system of conventional sewage pumping stations. The con- <br />and removal <br />struction of the gravity sewers will involve the break-up <br />of the layer of hard limestone in the sewer line's path as well as <br />' <br />the installation of well point dewatering systems as the sewer system <br />is It is anticipated that at least a 20' wide swath of <br />' <br />constructed. <br />hard limestone would have to be removed in order that proper dewatering <br />be done and to prevent undermining of the existing sand from beneath <br />can <br />the layer of limestone remaining on each side of the trench. The need <br />for the wide trench area, plus additional space requirements to store <br />the excavated material and provide for equipment maneuvering, requires <br />that the gravity collection system be installed within the 70' wide <br />1 -3 <br />