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40 F-1 11 C7 Upon completion pf the fill project, the shoreline is then subjected to a period of adjustment as waves and currents work the artificial perturbation in the shoreline (when compared with pre -construction conditions) into a quasi -stable, or "equilibrium" configuration. Given that the shoreline restoration alone does not eliminate the erosion problem which predicated the activity, the beach will continue to erode until a maintenance event, or "renourishment" of the shoreline occurs. The targeted level of storm protection for all beach restoration projects on the Island should enable any individually considered shoreline restoration segment to incur damages from a 15 year return interval storm at any time between the initial restoration (first time sand is placed on the shoreline) and subsequent renourishments (regular maintenance interval of sand placement to restore the shoreline to its initial restoration position). An eight (8) -year renourishment interval is sought for project cost effectiveness, maximum funding participation by the Florida ©apartment of Environi-nental Protection (for those projects which are eligible for state support), and realistic sand placement volumes as advance nourishment. A fifteen -year design level storm (6.67 percent probability of recurrence in any given year) was determined to provide the optimum project volumetric requirements. It is assumed that sand requirements for each identified shoreline sector targeted for restoration is avallahle. and of suitable quality con- as to rniniiiiirzc the fiver ii requirements. That is, the sand must be compatible, or nearly so, with the existing or 'native' sand on the pre -project shoreline. Final sand volume requirements for each shoreline designated for restoration will be determined by many design factors, among which sand compatibility will be critical.